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1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3 */
4#include <linux/bpf.h>
5#include <linux/bpf-cgroup.h>
6#include <linux/bpf_trace.h>
7#include <linux/bpf_lirc.h>
8#include <linux/bpf_verifier.h>
9#include <linux/bsearch.h>
10#include <linux/btf.h>
11#include <linux/syscalls.h>
12#include <linux/slab.h>
13#include <linux/sched/signal.h>
14#include <linux/vmalloc.h>
15#include <linux/mmzone.h>
16#include <linux/anon_inodes.h>
17#include <linux/fdtable.h>
18#include <linux/file.h>
19#include <linux/fs.h>
20#include <linux/license.h>
21#include <linux/filter.h>
22#include <linux/kernel.h>
23#include <linux/idr.h>
24#include <linux/cred.h>
25#include <linux/timekeeping.h>
26#include <linux/ctype.h>
27#include <linux/nospec.h>
28#include <linux/audit.h>
29#include <uapi/linux/btf.h>
30#include <linux/pgtable.h>
31#include <linux/bpf_lsm.h>
32#include <linux/poll.h>
33#include <linux/sort.h>
34#include <linux/bpf-netns.h>
35#include <linux/rcupdate_trace.h>
36#include <linux/memcontrol.h>
37#include <linux/trace_events.h>
38
39#define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
40 (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
41 (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
42#define IS_FD_PROG_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY)
43#define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
44#define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map) || \
45 IS_FD_HASH(map))
46
47#define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY)
48
49DEFINE_PER_CPU(int, bpf_prog_active);
50static DEFINE_IDR(prog_idr);
51static DEFINE_SPINLOCK(prog_idr_lock);
52static DEFINE_IDR(map_idr);
53static DEFINE_SPINLOCK(map_idr_lock);
54static DEFINE_IDR(link_idr);
55static DEFINE_SPINLOCK(link_idr_lock);
56
57int sysctl_unprivileged_bpf_disabled __read_mostly =
58 IS_BUILTIN(CONFIG_BPF_UNPRIV_DEFAULT_OFF) ? 2 : 0;
59
60static const struct bpf_map_ops * const bpf_map_types[] = {
61#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
62#define BPF_MAP_TYPE(_id, _ops) \
63 [_id] = &_ops,
64#define BPF_LINK_TYPE(_id, _name)
65#include <linux/bpf_types.h>
66#undef BPF_PROG_TYPE
67#undef BPF_MAP_TYPE
68#undef BPF_LINK_TYPE
69};
70
71/*
72 * If we're handed a bigger struct than we know of, ensure all the unknown bits
73 * are 0 - i.e. new user-space does not rely on any kernel feature extensions
74 * we don't know about yet.
75 *
76 * There is a ToCToU between this function call and the following
77 * copy_from_user() call. However, this is not a concern since this function is
78 * meant to be a future-proofing of bits.
79 */
80int bpf_check_uarg_tail_zero(bpfptr_t uaddr,
81 size_t expected_size,
82 size_t actual_size)
83{
84 int res;
85
86 if (unlikely(actual_size > PAGE_SIZE)) /* silly large */
87 return -E2BIG;
88
89 if (actual_size <= expected_size)
90 return 0;
91
92 if (uaddr.is_kernel)
93 res = memchr_inv(uaddr.kernel + expected_size, 0,
94 actual_size - expected_size) == NULL;
95 else
96 res = check_zeroed_user(uaddr.user + expected_size,
97 actual_size - expected_size);
98 if (res < 0)
99 return res;
100 return res ? 0 : -E2BIG;
101}
102
103const struct bpf_map_ops bpf_map_offload_ops = {
104 .map_meta_equal = bpf_map_meta_equal,
105 .map_alloc = bpf_map_offload_map_alloc,
106 .map_free = bpf_map_offload_map_free,
107 .map_check_btf = map_check_no_btf,
108};
109
110static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
111{
112 const struct bpf_map_ops *ops;
113 u32 type = attr->map_type;
114 struct bpf_map *map;
115 int err;
116
117 if (type >= ARRAY_SIZE(bpf_map_types))
118 return ERR_PTR(-EINVAL);
119 type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types));
120 ops = bpf_map_types[type];
121 if (!ops)
122 return ERR_PTR(-EINVAL);
123
124 if (ops->map_alloc_check) {
125 err = ops->map_alloc_check(attr);
126 if (err)
127 return ERR_PTR(err);
128 }
129 if (attr->map_ifindex)
130 ops = &bpf_map_offload_ops;
131 map = ops->map_alloc(attr);
132 if (IS_ERR(map))
133 return map;
134 map->ops = ops;
135 map->map_type = type;
136 return map;
137}
138
139static void bpf_map_write_active_inc(struct bpf_map *map)
140{
141 atomic64_inc(&map->writecnt);
142}
143
144static void bpf_map_write_active_dec(struct bpf_map *map)
145{
146 atomic64_dec(&map->writecnt);
147}
148
149bool bpf_map_write_active(const struct bpf_map *map)
150{
151 return atomic64_read(&map->writecnt) != 0;
152}
153
154static u32 bpf_map_value_size(const struct bpf_map *map)
155{
156 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
157 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
158 map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
159 map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
160 return round_up(map->value_size, 8) * num_possible_cpus();
161 else if (IS_FD_MAP(map))
162 return sizeof(u32);
163 else
164 return map->value_size;
165}
166
167static void maybe_wait_bpf_programs(struct bpf_map *map)
168{
169 /* Wait for any running BPF programs to complete so that
170 * userspace, when we return to it, knows that all programs
171 * that could be running use the new map value.
172 */
173 if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS ||
174 map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
175 synchronize_rcu();
176}
177
178static int bpf_map_update_value(struct bpf_map *map, struct file *map_file,
179 void *key, void *value, __u64 flags)
180{
181 int err;
182
183 /* Need to create a kthread, thus must support schedule */
184 if (bpf_map_is_dev_bound(map)) {
185 return bpf_map_offload_update_elem(map, key, value, flags);
186 } else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
187 map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
188 return map->ops->map_update_elem(map, key, value, flags);
189 } else if (map->map_type == BPF_MAP_TYPE_SOCKHASH ||
190 map->map_type == BPF_MAP_TYPE_SOCKMAP) {
191 return sock_map_update_elem_sys(map, key, value, flags);
192 } else if (IS_FD_PROG_ARRAY(map)) {
193 return bpf_fd_array_map_update_elem(map, map_file, key, value,
194 flags);
195 }
196
197 bpf_disable_instrumentation();
198 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
199 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
200 err = bpf_percpu_hash_update(map, key, value, flags);
201 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
202 err = bpf_percpu_array_update(map, key, value, flags);
203 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
204 err = bpf_percpu_cgroup_storage_update(map, key, value,
205 flags);
206 } else if (IS_FD_ARRAY(map)) {
207 rcu_read_lock();
208 err = bpf_fd_array_map_update_elem(map, map_file, key, value,
209 flags);
210 rcu_read_unlock();
211 } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
212 rcu_read_lock();
213 err = bpf_fd_htab_map_update_elem(map, map_file, key, value,
214 flags);
215 rcu_read_unlock();
216 } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
217 /* rcu_read_lock() is not needed */
218 err = bpf_fd_reuseport_array_update_elem(map, key, value,
219 flags);
220 } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
221 map->map_type == BPF_MAP_TYPE_STACK ||
222 map->map_type == BPF_MAP_TYPE_BLOOM_FILTER) {
223 err = map->ops->map_push_elem(map, value, flags);
224 } else {
225 rcu_read_lock();
226 err = map->ops->map_update_elem(map, key, value, flags);
227 rcu_read_unlock();
228 }
229 bpf_enable_instrumentation();
230 maybe_wait_bpf_programs(map);
231
232 return err;
233}
234
235static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value,
236 __u64 flags)
237{
238 void *ptr;
239 int err;
240
241 if (bpf_map_is_dev_bound(map))
242 return bpf_map_offload_lookup_elem(map, key, value);
243
244 bpf_disable_instrumentation();
245 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
246 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
247 err = bpf_percpu_hash_copy(map, key, value);
248 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
249 err = bpf_percpu_array_copy(map, key, value);
250 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
251 err = bpf_percpu_cgroup_storage_copy(map, key, value);
252 } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
253 err = bpf_stackmap_copy(map, key, value);
254 } else if (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map)) {
255 err = bpf_fd_array_map_lookup_elem(map, key, value);
256 } else if (IS_FD_HASH(map)) {
257 err = bpf_fd_htab_map_lookup_elem(map, key, value);
258 } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
259 err = bpf_fd_reuseport_array_lookup_elem(map, key, value);
260 } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
261 map->map_type == BPF_MAP_TYPE_STACK ||
262 map->map_type == BPF_MAP_TYPE_BLOOM_FILTER) {
263 err = map->ops->map_peek_elem(map, value);
264 } else if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
265 /* struct_ops map requires directly updating "value" */
266 err = bpf_struct_ops_map_sys_lookup_elem(map, key, value);
267 } else {
268 rcu_read_lock();
269 if (map->ops->map_lookup_elem_sys_only)
270 ptr = map->ops->map_lookup_elem_sys_only(map, key);
271 else
272 ptr = map->ops->map_lookup_elem(map, key);
273 if (IS_ERR(ptr)) {
274 err = PTR_ERR(ptr);
275 } else if (!ptr) {
276 err = -ENOENT;
277 } else {
278 err = 0;
279 if (flags & BPF_F_LOCK)
280 /* lock 'ptr' and copy everything but lock */
281 copy_map_value_locked(map, value, ptr, true);
282 else
283 copy_map_value(map, value, ptr);
284 /* mask lock and timer, since value wasn't zero inited */
285 check_and_init_map_value(map, value);
286 }
287 rcu_read_unlock();
288 }
289
290 bpf_enable_instrumentation();
291 maybe_wait_bpf_programs(map);
292
293 return err;
294}
295
296/* Please, do not use this function outside from the map creation path
297 * (e.g. in map update path) without taking care of setting the active
298 * memory cgroup (see at bpf_map_kmalloc_node() for example).
299 */
300static void *__bpf_map_area_alloc(u64 size, int numa_node, bool mmapable)
301{
302 /* We really just want to fail instead of triggering OOM killer
303 * under memory pressure, therefore we set __GFP_NORETRY to kmalloc,
304 * which is used for lower order allocation requests.
305 *
306 * It has been observed that higher order allocation requests done by
307 * vmalloc with __GFP_NORETRY being set might fail due to not trying
308 * to reclaim memory from the page cache, thus we set
309 * __GFP_RETRY_MAYFAIL to avoid such situations.
310 */
311
312 const gfp_t gfp = __GFP_NOWARN | __GFP_ZERO | __GFP_ACCOUNT;
313 unsigned int flags = 0;
314 unsigned long align = 1;
315 void *area;
316
317 if (size >= SIZE_MAX)
318 return NULL;
319
320 /* kmalloc()'ed memory can't be mmap()'ed */
321 if (mmapable) {
322 BUG_ON(!PAGE_ALIGNED(size));
323 align = SHMLBA;
324 flags = VM_USERMAP;
325 } else if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
326 area = kmalloc_node(size, gfp | GFP_USER | __GFP_NORETRY,
327 numa_node);
328 if (area != NULL)
329 return area;
330 }
331
332 return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
333 gfp | GFP_KERNEL | __GFP_RETRY_MAYFAIL, PAGE_KERNEL,
334 flags, numa_node, __builtin_return_address(0));
335}
336
337void *bpf_map_area_alloc(u64 size, int numa_node)
338{
339 return __bpf_map_area_alloc(size, numa_node, false);
340}
341
342void *bpf_map_area_mmapable_alloc(u64 size, int numa_node)
343{
344 return __bpf_map_area_alloc(size, numa_node, true);
345}
346
347void bpf_map_area_free(void *area)
348{
349 kvfree(area);
350}
351
352static u32 bpf_map_flags_retain_permanent(u32 flags)
353{
354 /* Some map creation flags are not tied to the map object but
355 * rather to the map fd instead, so they have no meaning upon
356 * map object inspection since multiple file descriptors with
357 * different (access) properties can exist here. Thus, given
358 * this has zero meaning for the map itself, lets clear these
359 * from here.
360 */
361 return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY);
362}
363
364void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr)
365{
366 map->map_type = attr->map_type;
367 map->key_size = attr->key_size;
368 map->value_size = attr->value_size;
369 map->max_entries = attr->max_entries;
370 map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags);
371 map->numa_node = bpf_map_attr_numa_node(attr);
372 map->map_extra = attr->map_extra;
373}
374
375static int bpf_map_alloc_id(struct bpf_map *map)
376{
377 int id;
378
379 idr_preload(GFP_KERNEL);
380 spin_lock_bh(&map_idr_lock);
381 id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
382 if (id > 0)
383 map->id = id;
384 spin_unlock_bh(&map_idr_lock);
385 idr_preload_end();
386
387 if (WARN_ON_ONCE(!id))
388 return -ENOSPC;
389
390 return id > 0 ? 0 : id;
391}
392
393void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
394{
395 unsigned long flags;
396
397 /* Offloaded maps are removed from the IDR store when their device
398 * disappears - even if someone holds an fd to them they are unusable,
399 * the memory is gone, all ops will fail; they are simply waiting for
400 * refcnt to drop to be freed.
401 */
402 if (!map->id)
403 return;
404
405 if (do_idr_lock)
406 spin_lock_irqsave(&map_idr_lock, flags);
407 else
408 __acquire(&map_idr_lock);
409
410 idr_remove(&map_idr, map->id);
411 map->id = 0;
412
413 if (do_idr_lock)
414 spin_unlock_irqrestore(&map_idr_lock, flags);
415 else
416 __release(&map_idr_lock);
417}
418
419#ifdef CONFIG_MEMCG_KMEM
420static void bpf_map_save_memcg(struct bpf_map *map)
421{
422 /* Currently if a map is created by a process belonging to the root
423 * memory cgroup, get_obj_cgroup_from_current() will return NULL.
424 * So we have to check map->objcg for being NULL each time it's
425 * being used.
426 */
427 map->objcg = get_obj_cgroup_from_current();
428}
429
430static void bpf_map_release_memcg(struct bpf_map *map)
431{
432 if (map->objcg)
433 obj_cgroup_put(map->objcg);
434}
435
436static struct mem_cgroup *bpf_map_get_memcg(const struct bpf_map *map)
437{
438 if (map->objcg)
439 return get_mem_cgroup_from_objcg(map->objcg);
440
441 return root_mem_cgroup;
442}
443
444void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
445 int node)
446{
447 struct mem_cgroup *memcg, *old_memcg;
448 void *ptr;
449
450 memcg = bpf_map_get_memcg(map);
451 old_memcg = set_active_memcg(memcg);
452 ptr = kmalloc_node(size, flags | __GFP_ACCOUNT, node);
453 set_active_memcg(old_memcg);
454 mem_cgroup_put(memcg);
455
456 return ptr;
457}
458
459void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
460{
461 struct mem_cgroup *memcg, *old_memcg;
462 void *ptr;
463
464 memcg = bpf_map_get_memcg(map);
465 old_memcg = set_active_memcg(memcg);
466 ptr = kzalloc(size, flags | __GFP_ACCOUNT);
467 set_active_memcg(old_memcg);
468 mem_cgroup_put(memcg);
469
470 return ptr;
471}
472
473void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
474 size_t align, gfp_t flags)
475{
476 struct mem_cgroup *memcg, *old_memcg;
477 void __percpu *ptr;
478
479 memcg = bpf_map_get_memcg(map);
480 old_memcg = set_active_memcg(memcg);
481 ptr = __alloc_percpu_gfp(size, align, flags | __GFP_ACCOUNT);
482 set_active_memcg(old_memcg);
483 mem_cgroup_put(memcg);
484
485 return ptr;
486}
487
488#else
489static void bpf_map_save_memcg(struct bpf_map *map)
490{
491}
492
493static void bpf_map_release_memcg(struct bpf_map *map)
494{
495}
496#endif
497
498static int btf_field_cmp(const void *a, const void *b)
499{
500 const struct btf_field *f1 = a, *f2 = b;
501
502 if (f1->offset < f2->offset)
503 return -1;
504 else if (f1->offset > f2->offset)
505 return 1;
506 return 0;
507}
508
509struct btf_field *btf_record_find(const struct btf_record *rec, u32 offset,
510 enum btf_field_type type)
511{
512 struct btf_field *field;
513
514 if (IS_ERR_OR_NULL(rec) || !(rec->field_mask & type))
515 return NULL;
516 field = bsearch(&offset, rec->fields, rec->cnt, sizeof(rec->fields[0]), btf_field_cmp);
517 if (!field || !(field->type & type))
518 return NULL;
519 return field;
520}
521
522void btf_record_free(struct btf_record *rec)
523{
524 int i;
525
526 if (IS_ERR_OR_NULL(rec))
527 return;
528 for (i = 0; i < rec->cnt; i++) {
529 switch (rec->fields[i].type) {
530 case BPF_SPIN_LOCK:
531 case BPF_TIMER:
532 break;
533 case BPF_KPTR_UNREF:
534 case BPF_KPTR_REF:
535 if (rec->fields[i].kptr.module)
536 module_put(rec->fields[i].kptr.module);
537 btf_put(rec->fields[i].kptr.btf);
538 break;
539 case BPF_LIST_HEAD:
540 case BPF_LIST_NODE:
541 /* Nothing to release for bpf_list_head */
542 break;
543 default:
544 WARN_ON_ONCE(1);
545 continue;
546 }
547 }
548 kfree(rec);
549}
550
551void bpf_map_free_record(struct bpf_map *map)
552{
553 btf_record_free(map->record);
554 map->record = NULL;
555}
556
557struct btf_record *btf_record_dup(const struct btf_record *rec)
558{
559 const struct btf_field *fields;
560 struct btf_record *new_rec;
561 int ret, size, i;
562
563 if (IS_ERR_OR_NULL(rec))
564 return NULL;
565 size = offsetof(struct btf_record, fields[rec->cnt]);
566 new_rec = kmemdup(rec, size, GFP_KERNEL | __GFP_NOWARN);
567 if (!new_rec)
568 return ERR_PTR(-ENOMEM);
569 /* Do a deep copy of the btf_record */
570 fields = rec->fields;
571 new_rec->cnt = 0;
572 for (i = 0; i < rec->cnt; i++) {
573 switch (fields[i].type) {
574 case BPF_SPIN_LOCK:
575 case BPF_TIMER:
576 break;
577 case BPF_KPTR_UNREF:
578 case BPF_KPTR_REF:
579 btf_get(fields[i].kptr.btf);
580 if (fields[i].kptr.module && !try_module_get(fields[i].kptr.module)) {
581 ret = -ENXIO;
582 goto free;
583 }
584 break;
585 case BPF_LIST_HEAD:
586 case BPF_LIST_NODE:
587 /* Nothing to acquire for bpf_list_head */
588 break;
589 default:
590 ret = -EFAULT;
591 WARN_ON_ONCE(1);
592 goto free;
593 }
594 new_rec->cnt++;
595 }
596 return new_rec;
597free:
598 btf_record_free(new_rec);
599 return ERR_PTR(ret);
600}
601
602bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b)
603{
604 bool a_has_fields = !IS_ERR_OR_NULL(rec_a), b_has_fields = !IS_ERR_OR_NULL(rec_b);
605 int size;
606
607 if (!a_has_fields && !b_has_fields)
608 return true;
609 if (a_has_fields != b_has_fields)
610 return false;
611 if (rec_a->cnt != rec_b->cnt)
612 return false;
613 size = offsetof(struct btf_record, fields[rec_a->cnt]);
614 /* btf_parse_fields uses kzalloc to allocate a btf_record, so unused
615 * members are zeroed out. So memcmp is safe to do without worrying
616 * about padding/unused fields.
617 *
618 * While spin_lock, timer, and kptr have no relation to map BTF,
619 * list_head metadata is specific to map BTF, the btf and value_rec
620 * members in particular. btf is the map BTF, while value_rec points to
621 * btf_record in that map BTF.
622 *
623 * So while by default, we don't rely on the map BTF (which the records
624 * were parsed from) matching for both records, which is not backwards
625 * compatible, in case list_head is part of it, we implicitly rely on
626 * that by way of depending on memcmp succeeding for it.
627 */
628 return !memcmp(rec_a, rec_b, size);
629}
630
631void bpf_obj_free_timer(const struct btf_record *rec, void *obj)
632{
633 if (WARN_ON_ONCE(!btf_record_has_field(rec, BPF_TIMER)))
634 return;
635 bpf_timer_cancel_and_free(obj + rec->timer_off);
636}
637
638void bpf_obj_free_fields(const struct btf_record *rec, void *obj)
639{
640 const struct btf_field *fields;
641 int i;
642
643 if (IS_ERR_OR_NULL(rec))
644 return;
645 fields = rec->fields;
646 for (i = 0; i < rec->cnt; i++) {
647 const struct btf_field *field = &fields[i];
648 void *field_ptr = obj + field->offset;
649
650 switch (fields[i].type) {
651 case BPF_SPIN_LOCK:
652 break;
653 case BPF_TIMER:
654 bpf_timer_cancel_and_free(field_ptr);
655 break;
656 case BPF_KPTR_UNREF:
657 WRITE_ONCE(*(u64 *)field_ptr, 0);
658 break;
659 case BPF_KPTR_REF:
660 field->kptr.dtor((void *)xchg((unsigned long *)field_ptr, 0));
661 break;
662 case BPF_LIST_HEAD:
663 if (WARN_ON_ONCE(rec->spin_lock_off < 0))
664 continue;
665 bpf_list_head_free(field, field_ptr, obj + rec->spin_lock_off);
666 break;
667 case BPF_LIST_NODE:
668 break;
669 default:
670 WARN_ON_ONCE(1);
671 continue;
672 }
673 }
674}
675
676/* called from workqueue */
677static void bpf_map_free_deferred(struct work_struct *work)
678{
679 struct bpf_map *map = container_of(work, struct bpf_map, work);
680 struct btf_field_offs *foffs = map->field_offs;
681 struct btf_record *rec = map->record;
682
683 security_bpf_map_free(map);
684 bpf_map_release_memcg(map);
685 /* implementation dependent freeing */
686 map->ops->map_free(map);
687 /* Delay freeing of field_offs and btf_record for maps, as map_free
688 * callback usually needs access to them. It is better to do it here
689 * than require each callback to do the free itself manually.
690 *
691 * Note that the btf_record stashed in map->inner_map_meta->record was
692 * already freed using the map_free callback for map in map case which
693 * eventually calls bpf_map_free_meta, since inner_map_meta is only a
694 * template bpf_map struct used during verification.
695 */
696 kfree(foffs);
697 btf_record_free(rec);
698}
699
700static void bpf_map_put_uref(struct bpf_map *map)
701{
702 if (atomic64_dec_and_test(&map->usercnt)) {
703 if (map->ops->map_release_uref)
704 map->ops->map_release_uref(map);
705 }
706}
707
708/* decrement map refcnt and schedule it for freeing via workqueue
709 * (unrelying map implementation ops->map_free() might sleep)
710 */
711static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
712{
713 if (atomic64_dec_and_test(&map->refcnt)) {
714 /* bpf_map_free_id() must be called first */
715 bpf_map_free_id(map, do_idr_lock);
716 btf_put(map->btf);
717 INIT_WORK(&map->work, bpf_map_free_deferred);
718 /* Avoid spawning kworkers, since they all might contend
719 * for the same mutex like slab_mutex.
720 */
721 queue_work(system_unbound_wq, &map->work);
722 }
723}
724
725void bpf_map_put(struct bpf_map *map)
726{
727 __bpf_map_put(map, true);
728}
729EXPORT_SYMBOL_GPL(bpf_map_put);
730
731void bpf_map_put_with_uref(struct bpf_map *map)
732{
733 bpf_map_put_uref(map);
734 bpf_map_put(map);
735}
736
737static int bpf_map_release(struct inode *inode, struct file *filp)
738{
739 struct bpf_map *map = filp->private_data;
740
741 if (map->ops->map_release)
742 map->ops->map_release(map, filp);
743
744 bpf_map_put_with_uref(map);
745 return 0;
746}
747
748static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f)
749{
750 fmode_t mode = f.file->f_mode;
751
752 /* Our file permissions may have been overridden by global
753 * map permissions facing syscall side.
754 */
755 if (READ_ONCE(map->frozen))
756 mode &= ~FMODE_CAN_WRITE;
757 return mode;
758}
759
760#ifdef CONFIG_PROC_FS
761/* Provides an approximation of the map's memory footprint.
762 * Used only to provide a backward compatibility and display
763 * a reasonable "memlock" info.
764 */
765static unsigned long bpf_map_memory_footprint(const struct bpf_map *map)
766{
767 unsigned long size;
768
769 size = round_up(map->key_size + bpf_map_value_size(map), 8);
770
771 return round_up(map->max_entries * size, PAGE_SIZE);
772}
773
774static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
775{
776 struct bpf_map *map = filp->private_data;
777 u32 type = 0, jited = 0;
778
779 if (map_type_contains_progs(map)) {
780 spin_lock(&map->owner.lock);
781 type = map->owner.type;
782 jited = map->owner.jited;
783 spin_unlock(&map->owner.lock);
784 }
785
786 seq_printf(m,
787 "map_type:\t%u\n"
788 "key_size:\t%u\n"
789 "value_size:\t%u\n"
790 "max_entries:\t%u\n"
791 "map_flags:\t%#x\n"
792 "map_extra:\t%#llx\n"
793 "memlock:\t%lu\n"
794 "map_id:\t%u\n"
795 "frozen:\t%u\n",
796 map->map_type,
797 map->key_size,
798 map->value_size,
799 map->max_entries,
800 map->map_flags,
801 (unsigned long long)map->map_extra,
802 bpf_map_memory_footprint(map),
803 map->id,
804 READ_ONCE(map->frozen));
805 if (type) {
806 seq_printf(m, "owner_prog_type:\t%u\n", type);
807 seq_printf(m, "owner_jited:\t%u\n", jited);
808 }
809}
810#endif
811
812static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz,
813 loff_t *ppos)
814{
815 /* We need this handler such that alloc_file() enables
816 * f_mode with FMODE_CAN_READ.
817 */
818 return -EINVAL;
819}
820
821static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf,
822 size_t siz, loff_t *ppos)
823{
824 /* We need this handler such that alloc_file() enables
825 * f_mode with FMODE_CAN_WRITE.
826 */
827 return -EINVAL;
828}
829
830/* called for any extra memory-mapped regions (except initial) */
831static void bpf_map_mmap_open(struct vm_area_struct *vma)
832{
833 struct bpf_map *map = vma->vm_file->private_data;
834
835 if (vma->vm_flags & VM_MAYWRITE)
836 bpf_map_write_active_inc(map);
837}
838
839/* called for all unmapped memory region (including initial) */
840static void bpf_map_mmap_close(struct vm_area_struct *vma)
841{
842 struct bpf_map *map = vma->vm_file->private_data;
843
844 if (vma->vm_flags & VM_MAYWRITE)
845 bpf_map_write_active_dec(map);
846}
847
848static const struct vm_operations_struct bpf_map_default_vmops = {
849 .open = bpf_map_mmap_open,
850 .close = bpf_map_mmap_close,
851};
852
853static int bpf_map_mmap(struct file *filp, struct vm_area_struct *vma)
854{
855 struct bpf_map *map = filp->private_data;
856 int err;
857
858 if (!map->ops->map_mmap || !IS_ERR_OR_NULL(map->record))
859 return -ENOTSUPP;
860
861 if (!(vma->vm_flags & VM_SHARED))
862 return -EINVAL;
863
864 mutex_lock(&map->freeze_mutex);
865
866 if (vma->vm_flags & VM_WRITE) {
867 if (map->frozen) {
868 err = -EPERM;
869 goto out;
870 }
871 /* map is meant to be read-only, so do not allow mapping as
872 * writable, because it's possible to leak a writable page
873 * reference and allows user-space to still modify it after
874 * freezing, while verifier will assume contents do not change
875 */
876 if (map->map_flags & BPF_F_RDONLY_PROG) {
877 err = -EACCES;
878 goto out;
879 }
880 }
881
882 /* set default open/close callbacks */
883 vma->vm_ops = &bpf_map_default_vmops;
884 vma->vm_private_data = map;
885 vma->vm_flags &= ~VM_MAYEXEC;
886 if (!(vma->vm_flags & VM_WRITE))
887 /* disallow re-mapping with PROT_WRITE */
888 vma->vm_flags &= ~VM_MAYWRITE;
889
890 err = map->ops->map_mmap(map, vma);
891 if (err)
892 goto out;
893
894 if (vma->vm_flags & VM_MAYWRITE)
895 bpf_map_write_active_inc(map);
896out:
897 mutex_unlock(&map->freeze_mutex);
898 return err;
899}
900
901static __poll_t bpf_map_poll(struct file *filp, struct poll_table_struct *pts)
902{
903 struct bpf_map *map = filp->private_data;
904
905 if (map->ops->map_poll)
906 return map->ops->map_poll(map, filp, pts);
907
908 return EPOLLERR;
909}
910
911const struct file_operations bpf_map_fops = {
912#ifdef CONFIG_PROC_FS
913 .show_fdinfo = bpf_map_show_fdinfo,
914#endif
915 .release = bpf_map_release,
916 .read = bpf_dummy_read,
917 .write = bpf_dummy_write,
918 .mmap = bpf_map_mmap,
919 .poll = bpf_map_poll,
920};
921
922int bpf_map_new_fd(struct bpf_map *map, int flags)
923{
924 int ret;
925
926 ret = security_bpf_map(map, OPEN_FMODE(flags));
927 if (ret < 0)
928 return ret;
929
930 return anon_inode_getfd("bpf-map", &bpf_map_fops, map,
931 flags | O_CLOEXEC);
932}
933
934int bpf_get_file_flag(int flags)
935{
936 if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY))
937 return -EINVAL;
938 if (flags & BPF_F_RDONLY)
939 return O_RDONLY;
940 if (flags & BPF_F_WRONLY)
941 return O_WRONLY;
942 return O_RDWR;
943}
944
945/* helper macro to check that unused fields 'union bpf_attr' are zero */
946#define CHECK_ATTR(CMD) \
947 memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
948 sizeof(attr->CMD##_LAST_FIELD), 0, \
949 sizeof(*attr) - \
950 offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
951 sizeof(attr->CMD##_LAST_FIELD)) != NULL
952
953/* dst and src must have at least "size" number of bytes.
954 * Return strlen on success and < 0 on error.
955 */
956int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size)
957{
958 const char *end = src + size;
959 const char *orig_src = src;
960
961 memset(dst, 0, size);
962 /* Copy all isalnum(), '_' and '.' chars. */
963 while (src < end && *src) {
964 if (!isalnum(*src) &&
965 *src != '_' && *src != '.')
966 return -EINVAL;
967 *dst++ = *src++;
968 }
969
970 /* No '\0' found in "size" number of bytes */
971 if (src == end)
972 return -EINVAL;
973
974 return src - orig_src;
975}
976
977int map_check_no_btf(const struct bpf_map *map,
978 const struct btf *btf,
979 const struct btf_type *key_type,
980 const struct btf_type *value_type)
981{
982 return -ENOTSUPP;
983}
984
985static int map_check_btf(struct bpf_map *map, const struct btf *btf,
986 u32 btf_key_id, u32 btf_value_id)
987{
988 const struct btf_type *key_type, *value_type;
989 u32 key_size, value_size;
990 int ret = 0;
991
992 /* Some maps allow key to be unspecified. */
993 if (btf_key_id) {
994 key_type = btf_type_id_size(btf, &btf_key_id, &key_size);
995 if (!key_type || key_size != map->key_size)
996 return -EINVAL;
997 } else {
998 key_type = btf_type_by_id(btf, 0);
999 if (!map->ops->map_check_btf)
1000 return -EINVAL;
1001 }
1002
1003 value_type = btf_type_id_size(btf, &btf_value_id, &value_size);
1004 if (!value_type || value_size != map->value_size)
1005 return -EINVAL;
1006
1007 map->record = btf_parse_fields(btf, value_type,
1008 BPF_SPIN_LOCK | BPF_TIMER | BPF_KPTR | BPF_LIST_HEAD,
1009 map->value_size);
1010 if (!IS_ERR_OR_NULL(map->record)) {
1011 int i;
1012
1013 if (!bpf_capable()) {
1014 ret = -EPERM;
1015 goto free_map_tab;
1016 }
1017 if (map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) {
1018 ret = -EACCES;
1019 goto free_map_tab;
1020 }
1021 for (i = 0; i < sizeof(map->record->field_mask) * 8; i++) {
1022 switch (map->record->field_mask & (1 << i)) {
1023 case 0:
1024 continue;
1025 case BPF_SPIN_LOCK:
1026 if (map->map_type != BPF_MAP_TYPE_HASH &&
1027 map->map_type != BPF_MAP_TYPE_ARRAY &&
1028 map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
1029 map->map_type != BPF_MAP_TYPE_SK_STORAGE &&
1030 map->map_type != BPF_MAP_TYPE_INODE_STORAGE &&
1031 map->map_type != BPF_MAP_TYPE_TASK_STORAGE &&
1032 map->map_type != BPF_MAP_TYPE_CGRP_STORAGE) {
1033 ret = -EOPNOTSUPP;
1034 goto free_map_tab;
1035 }
1036 break;
1037 case BPF_TIMER:
1038 if (map->map_type != BPF_MAP_TYPE_HASH &&
1039 map->map_type != BPF_MAP_TYPE_LRU_HASH &&
1040 map->map_type != BPF_MAP_TYPE_ARRAY) {
1041 ret = -EOPNOTSUPP;
1042 goto free_map_tab;
1043 }
1044 break;
1045 case BPF_KPTR_UNREF:
1046 case BPF_KPTR_REF:
1047 if (map->map_type != BPF_MAP_TYPE_HASH &&
1048 map->map_type != BPF_MAP_TYPE_LRU_HASH &&
1049 map->map_type != BPF_MAP_TYPE_ARRAY &&
1050 map->map_type != BPF_MAP_TYPE_PERCPU_ARRAY) {
1051 ret = -EOPNOTSUPP;
1052 goto free_map_tab;
1053 }
1054 break;
1055 case BPF_LIST_HEAD:
1056 if (map->map_type != BPF_MAP_TYPE_HASH &&
1057 map->map_type != BPF_MAP_TYPE_LRU_HASH &&
1058 map->map_type != BPF_MAP_TYPE_ARRAY) {
1059 ret = -EOPNOTSUPP;
1060 goto free_map_tab;
1061 }
1062 break;
1063 default:
1064 /* Fail if map_type checks are missing for a field type */
1065 ret = -EOPNOTSUPP;
1066 goto free_map_tab;
1067 }
1068 }
1069 }
1070
1071 ret = btf_check_and_fixup_fields(btf, map->record);
1072 if (ret < 0)
1073 goto free_map_tab;
1074
1075 if (map->ops->map_check_btf) {
1076 ret = map->ops->map_check_btf(map, btf, key_type, value_type);
1077 if (ret < 0)
1078 goto free_map_tab;
1079 }
1080
1081 return ret;
1082free_map_tab:
1083 bpf_map_free_record(map);
1084 return ret;
1085}
1086
1087#define BPF_MAP_CREATE_LAST_FIELD map_extra
1088/* called via syscall */
1089static int map_create(union bpf_attr *attr)
1090{
1091 int numa_node = bpf_map_attr_numa_node(attr);
1092 struct btf_field_offs *foffs;
1093 struct bpf_map *map;
1094 int f_flags;
1095 int err;
1096
1097 err = CHECK_ATTR(BPF_MAP_CREATE);
1098 if (err)
1099 return -EINVAL;
1100
1101 if (attr->btf_vmlinux_value_type_id) {
1102 if (attr->map_type != BPF_MAP_TYPE_STRUCT_OPS ||
1103 attr->btf_key_type_id || attr->btf_value_type_id)
1104 return -EINVAL;
1105 } else if (attr->btf_key_type_id && !attr->btf_value_type_id) {
1106 return -EINVAL;
1107 }
1108
1109 if (attr->map_type != BPF_MAP_TYPE_BLOOM_FILTER &&
1110 attr->map_extra != 0)
1111 return -EINVAL;
1112
1113 f_flags = bpf_get_file_flag(attr->map_flags);
1114 if (f_flags < 0)
1115 return f_flags;
1116
1117 if (numa_node != NUMA_NO_NODE &&
1118 ((unsigned int)numa_node >= nr_node_ids ||
1119 !node_online(numa_node)))
1120 return -EINVAL;
1121
1122 /* find map type and init map: hashtable vs rbtree vs bloom vs ... */
1123 map = find_and_alloc_map(attr);
1124 if (IS_ERR(map))
1125 return PTR_ERR(map);
1126
1127 err = bpf_obj_name_cpy(map->name, attr->map_name,
1128 sizeof(attr->map_name));
1129 if (err < 0)
1130 goto free_map;
1131
1132 atomic64_set(&map->refcnt, 1);
1133 atomic64_set(&map->usercnt, 1);
1134 mutex_init(&map->freeze_mutex);
1135 spin_lock_init(&map->owner.lock);
1136
1137 if (attr->btf_key_type_id || attr->btf_value_type_id ||
1138 /* Even the map's value is a kernel's struct,
1139 * the bpf_prog.o must have BTF to begin with
1140 * to figure out the corresponding kernel's
1141 * counter part. Thus, attr->btf_fd has
1142 * to be valid also.
1143 */
1144 attr->btf_vmlinux_value_type_id) {
1145 struct btf *btf;
1146
1147 btf = btf_get_by_fd(attr->btf_fd);
1148 if (IS_ERR(btf)) {
1149 err = PTR_ERR(btf);
1150 goto free_map;
1151 }
1152 if (btf_is_kernel(btf)) {
1153 btf_put(btf);
1154 err = -EACCES;
1155 goto free_map;
1156 }
1157 map->btf = btf;
1158
1159 if (attr->btf_value_type_id) {
1160 err = map_check_btf(map, btf, attr->btf_key_type_id,
1161 attr->btf_value_type_id);
1162 if (err)
1163 goto free_map;
1164 }
1165
1166 map->btf_key_type_id = attr->btf_key_type_id;
1167 map->btf_value_type_id = attr->btf_value_type_id;
1168 map->btf_vmlinux_value_type_id =
1169 attr->btf_vmlinux_value_type_id;
1170 }
1171
1172
1173 foffs = btf_parse_field_offs(map->record);
1174 if (IS_ERR(foffs)) {
1175 err = PTR_ERR(foffs);
1176 goto free_map;
1177 }
1178 map->field_offs = foffs;
1179
1180 err = security_bpf_map_alloc(map);
1181 if (err)
1182 goto free_map_field_offs;
1183
1184 err = bpf_map_alloc_id(map);
1185 if (err)
1186 goto free_map_sec;
1187
1188 bpf_map_save_memcg(map);
1189
1190 err = bpf_map_new_fd(map, f_flags);
1191 if (err < 0) {
1192 /* failed to allocate fd.
1193 * bpf_map_put_with_uref() is needed because the above
1194 * bpf_map_alloc_id() has published the map
1195 * to the userspace and the userspace may
1196 * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
1197 */
1198 bpf_map_put_with_uref(map);
1199 return err;
1200 }
1201
1202 return err;
1203
1204free_map_sec:
1205 security_bpf_map_free(map);
1206free_map_field_offs:
1207 kfree(map->field_offs);
1208free_map:
1209 btf_put(map->btf);
1210 map->ops->map_free(map);
1211 return err;
1212}
1213
1214/* if error is returned, fd is released.
1215 * On success caller should complete fd access with matching fdput()
1216 */
1217struct bpf_map *__bpf_map_get(struct fd f)
1218{
1219 if (!f.file)
1220 return ERR_PTR(-EBADF);
1221 if (f.file->f_op != &bpf_map_fops) {
1222 fdput(f);
1223 return ERR_PTR(-EINVAL);
1224 }
1225
1226 return f.file->private_data;
1227}
1228
1229void bpf_map_inc(struct bpf_map *map)
1230{
1231 atomic64_inc(&map->refcnt);
1232}
1233EXPORT_SYMBOL_GPL(bpf_map_inc);
1234
1235void bpf_map_inc_with_uref(struct bpf_map *map)
1236{
1237 atomic64_inc(&map->refcnt);
1238 atomic64_inc(&map->usercnt);
1239}
1240EXPORT_SYMBOL_GPL(bpf_map_inc_with_uref);
1241
1242struct bpf_map *bpf_map_get(u32 ufd)
1243{
1244 struct fd f = fdget(ufd);
1245 struct bpf_map *map;
1246
1247 map = __bpf_map_get(f);
1248 if (IS_ERR(map))
1249 return map;
1250
1251 bpf_map_inc(map);
1252 fdput(f);
1253
1254 return map;
1255}
1256EXPORT_SYMBOL(bpf_map_get);
1257
1258struct bpf_map *bpf_map_get_with_uref(u32 ufd)
1259{
1260 struct fd f = fdget(ufd);
1261 struct bpf_map *map;
1262
1263 map = __bpf_map_get(f);
1264 if (IS_ERR(map))
1265 return map;
1266
1267 bpf_map_inc_with_uref(map);
1268 fdput(f);
1269
1270 return map;
1271}
1272
1273/* map_idr_lock should have been held */
1274static struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref)
1275{
1276 int refold;
1277
1278 refold = atomic64_fetch_add_unless(&map->refcnt, 1, 0);
1279 if (!refold)
1280 return ERR_PTR(-ENOENT);
1281 if (uref)
1282 atomic64_inc(&map->usercnt);
1283
1284 return map;
1285}
1286
1287struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map)
1288{
1289 spin_lock_bh(&map_idr_lock);
1290 map = __bpf_map_inc_not_zero(map, false);
1291 spin_unlock_bh(&map_idr_lock);
1292
1293 return map;
1294}
1295EXPORT_SYMBOL_GPL(bpf_map_inc_not_zero);
1296
1297int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
1298{
1299 return -ENOTSUPP;
1300}
1301
1302static void *__bpf_copy_key(void __user *ukey, u64 key_size)
1303{
1304 if (key_size)
1305 return vmemdup_user(ukey, key_size);
1306
1307 if (ukey)
1308 return ERR_PTR(-EINVAL);
1309
1310 return NULL;
1311}
1312
1313static void *___bpf_copy_key(bpfptr_t ukey, u64 key_size)
1314{
1315 if (key_size)
1316 return kvmemdup_bpfptr(ukey, key_size);
1317
1318 if (!bpfptr_is_null(ukey))
1319 return ERR_PTR(-EINVAL);
1320
1321 return NULL;
1322}
1323
1324/* last field in 'union bpf_attr' used by this command */
1325#define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags
1326
1327static int map_lookup_elem(union bpf_attr *attr)
1328{
1329 void __user *ukey = u64_to_user_ptr(attr->key);
1330 void __user *uvalue = u64_to_user_ptr(attr->value);
1331 int ufd = attr->map_fd;
1332 struct bpf_map *map;
1333 void *key, *value;
1334 u32 value_size;
1335 struct fd f;
1336 int err;
1337
1338 if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
1339 return -EINVAL;
1340
1341 if (attr->flags & ~BPF_F_LOCK)
1342 return -EINVAL;
1343
1344 f = fdget(ufd);
1345 map = __bpf_map_get(f);
1346 if (IS_ERR(map))
1347 return PTR_ERR(map);
1348 if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
1349 err = -EPERM;
1350 goto err_put;
1351 }
1352
1353 if ((attr->flags & BPF_F_LOCK) &&
1354 !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
1355 err = -EINVAL;
1356 goto err_put;
1357 }
1358
1359 key = __bpf_copy_key(ukey, map->key_size);
1360 if (IS_ERR(key)) {
1361 err = PTR_ERR(key);
1362 goto err_put;
1363 }
1364
1365 value_size = bpf_map_value_size(map);
1366
1367 err = -ENOMEM;
1368 value = kvmalloc(value_size, GFP_USER | __GFP_NOWARN);
1369 if (!value)
1370 goto free_key;
1371
1372 if (map->map_type == BPF_MAP_TYPE_BLOOM_FILTER) {
1373 if (copy_from_user(value, uvalue, value_size))
1374 err = -EFAULT;
1375 else
1376 err = bpf_map_copy_value(map, key, value, attr->flags);
1377 goto free_value;
1378 }
1379
1380 err = bpf_map_copy_value(map, key, value, attr->flags);
1381 if (err)
1382 goto free_value;
1383
1384 err = -EFAULT;
1385 if (copy_to_user(uvalue, value, value_size) != 0)
1386 goto free_value;
1387
1388 err = 0;
1389
1390free_value:
1391 kvfree(value);
1392free_key:
1393 kvfree(key);
1394err_put:
1395 fdput(f);
1396 return err;
1397}
1398
1399
1400#define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
1401
1402static int map_update_elem(union bpf_attr *attr, bpfptr_t uattr)
1403{
1404 bpfptr_t ukey = make_bpfptr(attr->key, uattr.is_kernel);
1405 bpfptr_t uvalue = make_bpfptr(attr->value, uattr.is_kernel);
1406 int ufd = attr->map_fd;
1407 struct bpf_map *map;
1408 void *key, *value;
1409 u32 value_size;
1410 struct fd f;
1411 int err;
1412
1413 if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
1414 return -EINVAL;
1415
1416 f = fdget(ufd);
1417 map = __bpf_map_get(f);
1418 if (IS_ERR(map))
1419 return PTR_ERR(map);
1420 bpf_map_write_active_inc(map);
1421 if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
1422 err = -EPERM;
1423 goto err_put;
1424 }
1425
1426 if ((attr->flags & BPF_F_LOCK) &&
1427 !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
1428 err = -EINVAL;
1429 goto err_put;
1430 }
1431
1432 key = ___bpf_copy_key(ukey, map->key_size);
1433 if (IS_ERR(key)) {
1434 err = PTR_ERR(key);
1435 goto err_put;
1436 }
1437
1438 value_size = bpf_map_value_size(map);
1439 value = kvmemdup_bpfptr(uvalue, value_size);
1440 if (IS_ERR(value)) {
1441 err = PTR_ERR(value);
1442 goto free_key;
1443 }
1444
1445 err = bpf_map_update_value(map, f.file, key, value, attr->flags);
1446
1447 kvfree(value);
1448free_key:
1449 kvfree(key);
1450err_put:
1451 bpf_map_write_active_dec(map);
1452 fdput(f);
1453 return err;
1454}
1455
1456#define BPF_MAP_DELETE_ELEM_LAST_FIELD key
1457
1458static int map_delete_elem(union bpf_attr *attr, bpfptr_t uattr)
1459{
1460 bpfptr_t ukey = make_bpfptr(attr->key, uattr.is_kernel);
1461 int ufd = attr->map_fd;
1462 struct bpf_map *map;
1463 struct fd f;
1464 void *key;
1465 int err;
1466
1467 if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
1468 return -EINVAL;
1469
1470 f = fdget(ufd);
1471 map = __bpf_map_get(f);
1472 if (IS_ERR(map))
1473 return PTR_ERR(map);
1474 bpf_map_write_active_inc(map);
1475 if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
1476 err = -EPERM;
1477 goto err_put;
1478 }
1479
1480 key = ___bpf_copy_key(ukey, map->key_size);
1481 if (IS_ERR(key)) {
1482 err = PTR_ERR(key);
1483 goto err_put;
1484 }
1485
1486 if (bpf_map_is_dev_bound(map)) {
1487 err = bpf_map_offload_delete_elem(map, key);
1488 goto out;
1489 } else if (IS_FD_PROG_ARRAY(map) ||
1490 map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
1491 /* These maps require sleepable context */
1492 err = map->ops->map_delete_elem(map, key);
1493 goto out;
1494 }
1495
1496 bpf_disable_instrumentation();
1497 rcu_read_lock();
1498 err = map->ops->map_delete_elem(map, key);
1499 rcu_read_unlock();
1500 bpf_enable_instrumentation();
1501 maybe_wait_bpf_programs(map);
1502out:
1503 kvfree(key);
1504err_put:
1505 bpf_map_write_active_dec(map);
1506 fdput(f);
1507 return err;
1508}
1509
1510/* last field in 'union bpf_attr' used by this command */
1511#define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
1512
1513static int map_get_next_key(union bpf_attr *attr)
1514{
1515 void __user *ukey = u64_to_user_ptr(attr->key);
1516 void __user *unext_key = u64_to_user_ptr(attr->next_key);
1517 int ufd = attr->map_fd;
1518 struct bpf_map *map;
1519 void *key, *next_key;
1520 struct fd f;
1521 int err;
1522
1523 if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
1524 return -EINVAL;
1525
1526 f = fdget(ufd);
1527 map = __bpf_map_get(f);
1528 if (IS_ERR(map))
1529 return PTR_ERR(map);
1530 if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
1531 err = -EPERM;
1532 goto err_put;
1533 }
1534
1535 if (ukey) {
1536 key = __bpf_copy_key(ukey, map->key_size);
1537 if (IS_ERR(key)) {
1538 err = PTR_ERR(key);
1539 goto err_put;
1540 }
1541 } else {
1542 key = NULL;
1543 }
1544
1545 err = -ENOMEM;
1546 next_key = kvmalloc(map->key_size, GFP_USER);
1547 if (!next_key)
1548 goto free_key;
1549
1550 if (bpf_map_is_dev_bound(map)) {
1551 err = bpf_map_offload_get_next_key(map, key, next_key);
1552 goto out;
1553 }
1554
1555 rcu_read_lock();
1556 err = map->ops->map_get_next_key(map, key, next_key);
1557 rcu_read_unlock();
1558out:
1559 if (err)
1560 goto free_next_key;
1561
1562 err = -EFAULT;
1563 if (copy_to_user(unext_key, next_key, map->key_size) != 0)
1564 goto free_next_key;
1565
1566 err = 0;
1567
1568free_next_key:
1569 kvfree(next_key);
1570free_key:
1571 kvfree(key);
1572err_put:
1573 fdput(f);
1574 return err;
1575}
1576
1577int generic_map_delete_batch(struct bpf_map *map,
1578 const union bpf_attr *attr,
1579 union bpf_attr __user *uattr)
1580{
1581 void __user *keys = u64_to_user_ptr(attr->batch.keys);
1582 u32 cp, max_count;
1583 int err = 0;
1584 void *key;
1585
1586 if (attr->batch.elem_flags & ~BPF_F_LOCK)
1587 return -EINVAL;
1588
1589 if ((attr->batch.elem_flags & BPF_F_LOCK) &&
1590 !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
1591 return -EINVAL;
1592 }
1593
1594 max_count = attr->batch.count;
1595 if (!max_count)
1596 return 0;
1597
1598 key = kvmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
1599 if (!key)
1600 return -ENOMEM;
1601
1602 for (cp = 0; cp < max_count; cp++) {
1603 err = -EFAULT;
1604 if (copy_from_user(key, keys + cp * map->key_size,
1605 map->key_size))
1606 break;
1607
1608 if (bpf_map_is_dev_bound(map)) {
1609 err = bpf_map_offload_delete_elem(map, key);
1610 break;
1611 }
1612
1613 bpf_disable_instrumentation();
1614 rcu_read_lock();
1615 err = map->ops->map_delete_elem(map, key);
1616 rcu_read_unlock();
1617 bpf_enable_instrumentation();
1618 if (err)
1619 break;
1620 cond_resched();
1621 }
1622 if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
1623 err = -EFAULT;
1624
1625 kvfree(key);
1626
1627 maybe_wait_bpf_programs(map);
1628 return err;
1629}
1630
1631int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
1632 const union bpf_attr *attr,
1633 union bpf_attr __user *uattr)
1634{
1635 void __user *values = u64_to_user_ptr(attr->batch.values);
1636 void __user *keys = u64_to_user_ptr(attr->batch.keys);
1637 u32 value_size, cp, max_count;
1638 void *key, *value;
1639 int err = 0;
1640
1641 if (attr->batch.elem_flags & ~BPF_F_LOCK)
1642 return -EINVAL;
1643
1644 if ((attr->batch.elem_flags & BPF_F_LOCK) &&
1645 !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
1646 return -EINVAL;
1647 }
1648
1649 value_size = bpf_map_value_size(map);
1650
1651 max_count = attr->batch.count;
1652 if (!max_count)
1653 return 0;
1654
1655 key = kvmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
1656 if (!key)
1657 return -ENOMEM;
1658
1659 value = kvmalloc(value_size, GFP_USER | __GFP_NOWARN);
1660 if (!value) {
1661 kvfree(key);
1662 return -ENOMEM;
1663 }
1664
1665 for (cp = 0; cp < max_count; cp++) {
1666 err = -EFAULT;
1667 if (copy_from_user(key, keys + cp * map->key_size,
1668 map->key_size) ||
1669 copy_from_user(value, values + cp * value_size, value_size))
1670 break;
1671
1672 err = bpf_map_update_value(map, map_file, key, value,
1673 attr->batch.elem_flags);
1674
1675 if (err)
1676 break;
1677 cond_resched();
1678 }
1679
1680 if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
1681 err = -EFAULT;
1682
1683 kvfree(value);
1684 kvfree(key);
1685 return err;
1686}
1687
1688#define MAP_LOOKUP_RETRIES 3
1689
1690int generic_map_lookup_batch(struct bpf_map *map,
1691 const union bpf_attr *attr,
1692 union bpf_attr __user *uattr)
1693{
1694 void __user *uobatch = u64_to_user_ptr(attr->batch.out_batch);
1695 void __user *ubatch = u64_to_user_ptr(attr->batch.in_batch);
1696 void __user *values = u64_to_user_ptr(attr->batch.values);
1697 void __user *keys = u64_to_user_ptr(attr->batch.keys);
1698 void *buf, *buf_prevkey, *prev_key, *key, *value;
1699 int err, retry = MAP_LOOKUP_RETRIES;
1700 u32 value_size, cp, max_count;
1701
1702 if (attr->batch.elem_flags & ~BPF_F_LOCK)
1703 return -EINVAL;
1704
1705 if ((attr->batch.elem_flags & BPF_F_LOCK) &&
1706 !btf_record_has_field(map->record, BPF_SPIN_LOCK))
1707 return -EINVAL;
1708
1709 value_size = bpf_map_value_size(map);
1710
1711 max_count = attr->batch.count;
1712 if (!max_count)
1713 return 0;
1714
1715 if (put_user(0, &uattr->batch.count))
1716 return -EFAULT;
1717
1718 buf_prevkey = kvmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
1719 if (!buf_prevkey)
1720 return -ENOMEM;
1721
1722 buf = kvmalloc(map->key_size + value_size, GFP_USER | __GFP_NOWARN);
1723 if (!buf) {
1724 kvfree(buf_prevkey);
1725 return -ENOMEM;
1726 }
1727
1728 err = -EFAULT;
1729 prev_key = NULL;
1730 if (ubatch && copy_from_user(buf_prevkey, ubatch, map->key_size))
1731 goto free_buf;
1732 key = buf;
1733 value = key + map->key_size;
1734 if (ubatch)
1735 prev_key = buf_prevkey;
1736
1737 for (cp = 0; cp < max_count;) {
1738 rcu_read_lock();
1739 err = map->ops->map_get_next_key(map, prev_key, key);
1740 rcu_read_unlock();
1741 if (err)
1742 break;
1743 err = bpf_map_copy_value(map, key, value,
1744 attr->batch.elem_flags);
1745
1746 if (err == -ENOENT) {
1747 if (retry) {
1748 retry--;
1749 continue;
1750 }
1751 err = -EINTR;
1752 break;
1753 }
1754
1755 if (err)
1756 goto free_buf;
1757
1758 if (copy_to_user(keys + cp * map->key_size, key,
1759 map->key_size)) {
1760 err = -EFAULT;
1761 goto free_buf;
1762 }
1763 if (copy_to_user(values + cp * value_size, value, value_size)) {
1764 err = -EFAULT;
1765 goto free_buf;
1766 }
1767
1768 if (!prev_key)
1769 prev_key = buf_prevkey;
1770
1771 swap(prev_key, key);
1772 retry = MAP_LOOKUP_RETRIES;
1773 cp++;
1774 cond_resched();
1775 }
1776
1777 if (err == -EFAULT)
1778 goto free_buf;
1779
1780 if ((copy_to_user(&uattr->batch.count, &cp, sizeof(cp)) ||
1781 (cp && copy_to_user(uobatch, prev_key, map->key_size))))
1782 err = -EFAULT;
1783
1784free_buf:
1785 kvfree(buf_prevkey);
1786 kvfree(buf);
1787 return err;
1788}
1789
1790#define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD flags
1791
1792static int map_lookup_and_delete_elem(union bpf_attr *attr)
1793{
1794 void __user *ukey = u64_to_user_ptr(attr->key);
1795 void __user *uvalue = u64_to_user_ptr(attr->value);
1796 int ufd = attr->map_fd;
1797 struct bpf_map *map;
1798 void *key, *value;
1799 u32 value_size;
1800 struct fd f;
1801 int err;
1802
1803 if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM))
1804 return -EINVAL;
1805
1806 if (attr->flags & ~BPF_F_LOCK)
1807 return -EINVAL;
1808
1809 f = fdget(ufd);
1810 map = __bpf_map_get(f);
1811 if (IS_ERR(map))
1812 return PTR_ERR(map);
1813 bpf_map_write_active_inc(map);
1814 if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ) ||
1815 !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
1816 err = -EPERM;
1817 goto err_put;
1818 }
1819
1820 if (attr->flags &&
1821 (map->map_type == BPF_MAP_TYPE_QUEUE ||
1822 map->map_type == BPF_MAP_TYPE_STACK)) {
1823 err = -EINVAL;
1824 goto err_put;
1825 }
1826
1827 if ((attr->flags & BPF_F_LOCK) &&
1828 !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
1829 err = -EINVAL;
1830 goto err_put;
1831 }
1832
1833 key = __bpf_copy_key(ukey, map->key_size);
1834 if (IS_ERR(key)) {
1835 err = PTR_ERR(key);
1836 goto err_put;
1837 }
1838
1839 value_size = bpf_map_value_size(map);
1840
1841 err = -ENOMEM;
1842 value = kvmalloc(value_size, GFP_USER | __GFP_NOWARN);
1843 if (!value)
1844 goto free_key;
1845
1846 err = -ENOTSUPP;
1847 if (map->map_type == BPF_MAP_TYPE_QUEUE ||
1848 map->map_type == BPF_MAP_TYPE_STACK) {
1849 err = map->ops->map_pop_elem(map, value);
1850 } else if (map->map_type == BPF_MAP_TYPE_HASH ||
1851 map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
1852 map->map_type == BPF_MAP_TYPE_LRU_HASH ||
1853 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
1854 if (!bpf_map_is_dev_bound(map)) {
1855 bpf_disable_instrumentation();
1856 rcu_read_lock();
1857 err = map->ops->map_lookup_and_delete_elem(map, key, value, attr->flags);
1858 rcu_read_unlock();
1859 bpf_enable_instrumentation();
1860 }
1861 }
1862
1863 if (err)
1864 goto free_value;
1865
1866 if (copy_to_user(uvalue, value, value_size) != 0) {
1867 err = -EFAULT;
1868 goto free_value;
1869 }
1870
1871 err = 0;
1872
1873free_value:
1874 kvfree(value);
1875free_key:
1876 kvfree(key);
1877err_put:
1878 bpf_map_write_active_dec(map);
1879 fdput(f);
1880 return err;
1881}
1882
1883#define BPF_MAP_FREEZE_LAST_FIELD map_fd
1884
1885static int map_freeze(const union bpf_attr *attr)
1886{
1887 int err = 0, ufd = attr->map_fd;
1888 struct bpf_map *map;
1889 struct fd f;
1890
1891 if (CHECK_ATTR(BPF_MAP_FREEZE))
1892 return -EINVAL;
1893
1894 f = fdget(ufd);
1895 map = __bpf_map_get(f);
1896 if (IS_ERR(map))
1897 return PTR_ERR(map);
1898
1899 if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS || !IS_ERR_OR_NULL(map->record)) {
1900 fdput(f);
1901 return -ENOTSUPP;
1902 }
1903
1904 mutex_lock(&map->freeze_mutex);
1905 if (bpf_map_write_active(map)) {
1906 err = -EBUSY;
1907 goto err_put;
1908 }
1909 if (READ_ONCE(map->frozen)) {
1910 err = -EBUSY;
1911 goto err_put;
1912 }
1913 if (!bpf_capable()) {
1914 err = -EPERM;
1915 goto err_put;
1916 }
1917
1918 WRITE_ONCE(map->frozen, true);
1919err_put:
1920 mutex_unlock(&map->freeze_mutex);
1921 fdput(f);
1922 return err;
1923}
1924
1925static const struct bpf_prog_ops * const bpf_prog_types[] = {
1926#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
1927 [_id] = & _name ## _prog_ops,
1928#define BPF_MAP_TYPE(_id, _ops)
1929#define BPF_LINK_TYPE(_id, _name)
1930#include <linux/bpf_types.h>
1931#undef BPF_PROG_TYPE
1932#undef BPF_MAP_TYPE
1933#undef BPF_LINK_TYPE
1934};
1935
1936static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
1937{
1938 const struct bpf_prog_ops *ops;
1939
1940 if (type >= ARRAY_SIZE(bpf_prog_types))
1941 return -EINVAL;
1942 type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types));
1943 ops = bpf_prog_types[type];
1944 if (!ops)
1945 return -EINVAL;
1946
1947 if (!bpf_prog_is_dev_bound(prog->aux))
1948 prog->aux->ops = ops;
1949 else
1950 prog->aux->ops = &bpf_offload_prog_ops;
1951 prog->type = type;
1952 return 0;
1953}
1954
1955enum bpf_audit {
1956 BPF_AUDIT_LOAD,
1957 BPF_AUDIT_UNLOAD,
1958 BPF_AUDIT_MAX,
1959};
1960
1961static const char * const bpf_audit_str[BPF_AUDIT_MAX] = {
1962 [BPF_AUDIT_LOAD] = "LOAD",
1963 [BPF_AUDIT_UNLOAD] = "UNLOAD",
1964};
1965
1966static void bpf_audit_prog(const struct bpf_prog *prog, unsigned int op)
1967{
1968 struct audit_context *ctx = NULL;
1969 struct audit_buffer *ab;
1970
1971 if (WARN_ON_ONCE(op >= BPF_AUDIT_MAX))
1972 return;
1973 if (audit_enabled == AUDIT_OFF)
1974 return;
1975 if (!in_irq() && !irqs_disabled())
1976 ctx = audit_context();
1977 ab = audit_log_start(ctx, GFP_ATOMIC, AUDIT_BPF);
1978 if (unlikely(!ab))
1979 return;
1980 audit_log_format(ab, "prog-id=%u op=%s",
1981 prog->aux->id, bpf_audit_str[op]);
1982 audit_log_end(ab);
1983}
1984
1985static int bpf_prog_alloc_id(struct bpf_prog *prog)
1986{
1987 int id;
1988
1989 idr_preload(GFP_KERNEL);
1990 spin_lock_bh(&prog_idr_lock);
1991 id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
1992 if (id > 0)
1993 prog->aux->id = id;
1994 spin_unlock_bh(&prog_idr_lock);
1995 idr_preload_end();
1996
1997 /* id is in [1, INT_MAX) */
1998 if (WARN_ON_ONCE(!id))
1999 return -ENOSPC;
2000
2001 return id > 0 ? 0 : id;
2002}
2003
2004void bpf_prog_free_id(struct bpf_prog *prog)
2005{
2006 unsigned long flags;
2007
2008 /* cBPF to eBPF migrations are currently not in the idr store.
2009 * Offloaded programs are removed from the store when their device
2010 * disappears - even if someone grabs an fd to them they are unusable,
2011 * simply waiting for refcnt to drop to be freed.
2012 */
2013 if (!prog->aux->id)
2014 return;
2015
2016 spin_lock_irqsave(&prog_idr_lock, flags);
2017 idr_remove(&prog_idr, prog->aux->id);
2018 prog->aux->id = 0;
2019 spin_unlock_irqrestore(&prog_idr_lock, flags);
2020}
2021
2022static void __bpf_prog_put_rcu(struct rcu_head *rcu)
2023{
2024 struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
2025
2026 kvfree(aux->func_info);
2027 kfree(aux->func_info_aux);
2028 free_uid(aux->user);
2029 security_bpf_prog_free(aux);
2030 bpf_prog_free(aux->prog);
2031}
2032
2033static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred)
2034{
2035 bpf_prog_kallsyms_del_all(prog);
2036 btf_put(prog->aux->btf);
2037 kvfree(prog->aux->jited_linfo);
2038 kvfree(prog->aux->linfo);
2039 kfree(prog->aux->kfunc_tab);
2040 if (prog->aux->attach_btf)
2041 btf_put(prog->aux->attach_btf);
2042
2043 if (deferred) {
2044 if (prog->aux->sleepable)
2045 call_rcu_tasks_trace(&prog->aux->rcu, __bpf_prog_put_rcu);
2046 else
2047 call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
2048 } else {
2049 __bpf_prog_put_rcu(&prog->aux->rcu);
2050 }
2051}
2052
2053static void bpf_prog_put_deferred(struct work_struct *work)
2054{
2055 struct bpf_prog_aux *aux;
2056 struct bpf_prog *prog;
2057
2058 aux = container_of(work, struct bpf_prog_aux, work);
2059 prog = aux->prog;
2060 perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
2061 bpf_audit_prog(prog, BPF_AUDIT_UNLOAD);
2062 bpf_prog_free_id(prog);
2063 __bpf_prog_put_noref(prog, true);
2064}
2065
2066static void __bpf_prog_put(struct bpf_prog *prog)
2067{
2068 struct bpf_prog_aux *aux = prog->aux;
2069
2070 if (atomic64_dec_and_test(&aux->refcnt)) {
2071 if (in_irq() || irqs_disabled()) {
2072 INIT_WORK(&aux->work, bpf_prog_put_deferred);
2073 schedule_work(&aux->work);
2074 } else {
2075 bpf_prog_put_deferred(&aux->work);
2076 }
2077 }
2078}
2079
2080void bpf_prog_put(struct bpf_prog *prog)
2081{
2082 __bpf_prog_put(prog);
2083}
2084EXPORT_SYMBOL_GPL(bpf_prog_put);
2085
2086static int bpf_prog_release(struct inode *inode, struct file *filp)
2087{
2088 struct bpf_prog *prog = filp->private_data;
2089
2090 bpf_prog_put(prog);
2091 return 0;
2092}
2093
2094struct bpf_prog_kstats {
2095 u64 nsecs;
2096 u64 cnt;
2097 u64 misses;
2098};
2099
2100void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog)
2101{
2102 struct bpf_prog_stats *stats;
2103 unsigned int flags;
2104
2105 stats = this_cpu_ptr(prog->stats);
2106 flags = u64_stats_update_begin_irqsave(&stats->syncp);
2107 u64_stats_inc(&stats->misses);
2108 u64_stats_update_end_irqrestore(&stats->syncp, flags);
2109}
2110
2111static void bpf_prog_get_stats(const struct bpf_prog *prog,
2112 struct bpf_prog_kstats *stats)
2113{
2114 u64 nsecs = 0, cnt = 0, misses = 0;
2115 int cpu;
2116
2117 for_each_possible_cpu(cpu) {
2118 const struct bpf_prog_stats *st;
2119 unsigned int start;
2120 u64 tnsecs, tcnt, tmisses;
2121
2122 st = per_cpu_ptr(prog->stats, cpu);
2123 do {
2124 start = u64_stats_fetch_begin(&st->syncp);
2125 tnsecs = u64_stats_read(&st->nsecs);
2126 tcnt = u64_stats_read(&st->cnt);
2127 tmisses = u64_stats_read(&st->misses);
2128 } while (u64_stats_fetch_retry(&st->syncp, start));
2129 nsecs += tnsecs;
2130 cnt += tcnt;
2131 misses += tmisses;
2132 }
2133 stats->nsecs = nsecs;
2134 stats->cnt = cnt;
2135 stats->misses = misses;
2136}
2137
2138#ifdef CONFIG_PROC_FS
2139static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp)
2140{
2141 const struct bpf_prog *prog = filp->private_data;
2142 char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
2143 struct bpf_prog_kstats stats;
2144
2145 bpf_prog_get_stats(prog, &stats);
2146 bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
2147 seq_printf(m,
2148 "prog_type:\t%u\n"
2149 "prog_jited:\t%u\n"
2150 "prog_tag:\t%s\n"
2151 "memlock:\t%llu\n"
2152 "prog_id:\t%u\n"
2153 "run_time_ns:\t%llu\n"
2154 "run_cnt:\t%llu\n"
2155 "recursion_misses:\t%llu\n"
2156 "verified_insns:\t%u\n",
2157 prog->type,
2158 prog->jited,
2159 prog_tag,
2160 prog->pages * 1ULL << PAGE_SHIFT,
2161 prog->aux->id,
2162 stats.nsecs,
2163 stats.cnt,
2164 stats.misses,
2165 prog->aux->verified_insns);
2166}
2167#endif
2168
2169const struct file_operations bpf_prog_fops = {
2170#ifdef CONFIG_PROC_FS
2171 .show_fdinfo = bpf_prog_show_fdinfo,
2172#endif
2173 .release = bpf_prog_release,
2174 .read = bpf_dummy_read,
2175 .write = bpf_dummy_write,
2176};
2177
2178int bpf_prog_new_fd(struct bpf_prog *prog)
2179{
2180 int ret;
2181
2182 ret = security_bpf_prog(prog);
2183 if (ret < 0)
2184 return ret;
2185
2186 return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog,
2187 O_RDWR | O_CLOEXEC);
2188}
2189
2190static struct bpf_prog *____bpf_prog_get(struct fd f)
2191{
2192 if (!f.file)
2193 return ERR_PTR(-EBADF);
2194 if (f.file->f_op != &bpf_prog_fops) {
2195 fdput(f);
2196 return ERR_PTR(-EINVAL);
2197 }
2198
2199 return f.file->private_data;
2200}
2201
2202void bpf_prog_add(struct bpf_prog *prog, int i)
2203{
2204 atomic64_add(i, &prog->aux->refcnt);
2205}
2206EXPORT_SYMBOL_GPL(bpf_prog_add);
2207
2208void bpf_prog_sub(struct bpf_prog *prog, int i)
2209{
2210 /* Only to be used for undoing previous bpf_prog_add() in some
2211 * error path. We still know that another entity in our call
2212 * path holds a reference to the program, thus atomic_sub() can
2213 * be safely used in such cases!
2214 */
2215 WARN_ON(atomic64_sub_return(i, &prog->aux->refcnt) == 0);
2216}
2217EXPORT_SYMBOL_GPL(bpf_prog_sub);
2218
2219void bpf_prog_inc(struct bpf_prog *prog)
2220{
2221 atomic64_inc(&prog->aux->refcnt);
2222}
2223EXPORT_SYMBOL_GPL(bpf_prog_inc);
2224
2225/* prog_idr_lock should have been held */
2226struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
2227{
2228 int refold;
2229
2230 refold = atomic64_fetch_add_unless(&prog->aux->refcnt, 1, 0);
2231
2232 if (!refold)
2233 return ERR_PTR(-ENOENT);
2234
2235 return prog;
2236}
2237EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
2238
2239bool bpf_prog_get_ok(struct bpf_prog *prog,
2240 enum bpf_prog_type *attach_type, bool attach_drv)
2241{
2242 /* not an attachment, just a refcount inc, always allow */
2243 if (!attach_type)
2244 return true;
2245
2246 if (prog->type != *attach_type)
2247 return false;
2248 if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv)
2249 return false;
2250
2251 return true;
2252}
2253
2254static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
2255 bool attach_drv)
2256{
2257 struct fd f = fdget(ufd);
2258 struct bpf_prog *prog;
2259
2260 prog = ____bpf_prog_get(f);
2261 if (IS_ERR(prog))
2262 return prog;
2263 if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) {
2264 prog = ERR_PTR(-EINVAL);
2265 goto out;
2266 }
2267
2268 bpf_prog_inc(prog);
2269out:
2270 fdput(f);
2271 return prog;
2272}
2273
2274struct bpf_prog *bpf_prog_get(u32 ufd)
2275{
2276 return __bpf_prog_get(ufd, NULL, false);
2277}
2278
2279struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2280 bool attach_drv)
2281{
2282 return __bpf_prog_get(ufd, &type, attach_drv);
2283}
2284EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev);
2285
2286/* Initially all BPF programs could be loaded w/o specifying
2287 * expected_attach_type. Later for some of them specifying expected_attach_type
2288 * at load time became required so that program could be validated properly.
2289 * Programs of types that are allowed to be loaded both w/ and w/o (for
2290 * backward compatibility) expected_attach_type, should have the default attach
2291 * type assigned to expected_attach_type for the latter case, so that it can be
2292 * validated later at attach time.
2293 *
2294 * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if
2295 * prog type requires it but has some attach types that have to be backward
2296 * compatible.
2297 */
2298static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr)
2299{
2300 switch (attr->prog_type) {
2301 case BPF_PROG_TYPE_CGROUP_SOCK:
2302 /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't
2303 * exist so checking for non-zero is the way to go here.
2304 */
2305 if (!attr->expected_attach_type)
2306 attr->expected_attach_type =
2307 BPF_CGROUP_INET_SOCK_CREATE;
2308 break;
2309 case BPF_PROG_TYPE_SK_REUSEPORT:
2310 if (!attr->expected_attach_type)
2311 attr->expected_attach_type =
2312 BPF_SK_REUSEPORT_SELECT;
2313 break;
2314 }
2315}
2316
2317static int
2318bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
2319 enum bpf_attach_type expected_attach_type,
2320 struct btf *attach_btf, u32 btf_id,
2321 struct bpf_prog *dst_prog)
2322{
2323 if (btf_id) {
2324 if (btf_id > BTF_MAX_TYPE)
2325 return -EINVAL;
2326
2327 if (!attach_btf && !dst_prog)
2328 return -EINVAL;
2329
2330 switch (prog_type) {
2331 case BPF_PROG_TYPE_TRACING:
2332 case BPF_PROG_TYPE_LSM:
2333 case BPF_PROG_TYPE_STRUCT_OPS:
2334 case BPF_PROG_TYPE_EXT:
2335 break;
2336 default:
2337 return -EINVAL;
2338 }
2339 }
2340
2341 if (attach_btf && (!btf_id || dst_prog))
2342 return -EINVAL;
2343
2344 if (dst_prog && prog_type != BPF_PROG_TYPE_TRACING &&
2345 prog_type != BPF_PROG_TYPE_EXT)
2346 return -EINVAL;
2347
2348 switch (prog_type) {
2349 case BPF_PROG_TYPE_CGROUP_SOCK:
2350 switch (expected_attach_type) {
2351 case BPF_CGROUP_INET_SOCK_CREATE:
2352 case BPF_CGROUP_INET_SOCK_RELEASE:
2353 case BPF_CGROUP_INET4_POST_BIND:
2354 case BPF_CGROUP_INET6_POST_BIND:
2355 return 0;
2356 default:
2357 return -EINVAL;
2358 }
2359 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2360 switch (expected_attach_type) {
2361 case BPF_CGROUP_INET4_BIND:
2362 case BPF_CGROUP_INET6_BIND:
2363 case BPF_CGROUP_INET4_CONNECT:
2364 case BPF_CGROUP_INET6_CONNECT:
2365 case BPF_CGROUP_INET4_GETPEERNAME:
2366 case BPF_CGROUP_INET6_GETPEERNAME:
2367 case BPF_CGROUP_INET4_GETSOCKNAME:
2368 case BPF_CGROUP_INET6_GETSOCKNAME:
2369 case BPF_CGROUP_UDP4_SENDMSG:
2370 case BPF_CGROUP_UDP6_SENDMSG:
2371 case BPF_CGROUP_UDP4_RECVMSG:
2372 case BPF_CGROUP_UDP6_RECVMSG:
2373 return 0;
2374 default:
2375 return -EINVAL;
2376 }
2377 case BPF_PROG_TYPE_CGROUP_SKB:
2378 switch (expected_attach_type) {
2379 case BPF_CGROUP_INET_INGRESS:
2380 case BPF_CGROUP_INET_EGRESS:
2381 return 0;
2382 default:
2383 return -EINVAL;
2384 }
2385 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2386 switch (expected_attach_type) {
2387 case BPF_CGROUP_SETSOCKOPT:
2388 case BPF_CGROUP_GETSOCKOPT:
2389 return 0;
2390 default:
2391 return -EINVAL;
2392 }
2393 case BPF_PROG_TYPE_SK_LOOKUP:
2394 if (expected_attach_type == BPF_SK_LOOKUP)
2395 return 0;
2396 return -EINVAL;
2397 case BPF_PROG_TYPE_SK_REUSEPORT:
2398 switch (expected_attach_type) {
2399 case BPF_SK_REUSEPORT_SELECT:
2400 case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE:
2401 return 0;
2402 default:
2403 return -EINVAL;
2404 }
2405 case BPF_PROG_TYPE_SYSCALL:
2406 case BPF_PROG_TYPE_EXT:
2407 if (expected_attach_type)
2408 return -EINVAL;
2409 fallthrough;
2410 default:
2411 return 0;
2412 }
2413}
2414
2415static bool is_net_admin_prog_type(enum bpf_prog_type prog_type)
2416{
2417 switch (prog_type) {
2418 case BPF_PROG_TYPE_SCHED_CLS:
2419 case BPF_PROG_TYPE_SCHED_ACT:
2420 case BPF_PROG_TYPE_XDP:
2421 case BPF_PROG_TYPE_LWT_IN:
2422 case BPF_PROG_TYPE_LWT_OUT:
2423 case BPF_PROG_TYPE_LWT_XMIT:
2424 case BPF_PROG_TYPE_LWT_SEG6LOCAL:
2425 case BPF_PROG_TYPE_SK_SKB:
2426 case BPF_PROG_TYPE_SK_MSG:
2427 case BPF_PROG_TYPE_LIRC_MODE2:
2428 case BPF_PROG_TYPE_FLOW_DISSECTOR:
2429 case BPF_PROG_TYPE_CGROUP_DEVICE:
2430 case BPF_PROG_TYPE_CGROUP_SOCK:
2431 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
2432 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
2433 case BPF_PROG_TYPE_CGROUP_SYSCTL:
2434 case BPF_PROG_TYPE_SOCK_OPS:
2435 case BPF_PROG_TYPE_EXT: /* extends any prog */
2436 return true;
2437 case BPF_PROG_TYPE_CGROUP_SKB:
2438 /* always unpriv */
2439 case BPF_PROG_TYPE_SK_REUSEPORT:
2440 /* equivalent to SOCKET_FILTER. need CAP_BPF only */
2441 default:
2442 return false;
2443 }
2444}
2445
2446static bool is_perfmon_prog_type(enum bpf_prog_type prog_type)
2447{
2448 switch (prog_type) {
2449 case BPF_PROG_TYPE_KPROBE:
2450 case BPF_PROG_TYPE_TRACEPOINT:
2451 case BPF_PROG_TYPE_PERF_EVENT:
2452 case BPF_PROG_TYPE_RAW_TRACEPOINT:
2453 case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
2454 case BPF_PROG_TYPE_TRACING:
2455 case BPF_PROG_TYPE_LSM:
2456 case BPF_PROG_TYPE_STRUCT_OPS: /* has access to struct sock */
2457 case BPF_PROG_TYPE_EXT: /* extends any prog */
2458 return true;
2459 default:
2460 return false;
2461 }
2462}
2463
2464/* last field in 'union bpf_attr' used by this command */
2465#define BPF_PROG_LOAD_LAST_FIELD core_relo_rec_size
2466
2467static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr)
2468{
2469 enum bpf_prog_type type = attr->prog_type;
2470 struct bpf_prog *prog, *dst_prog = NULL;
2471 struct btf *attach_btf = NULL;
2472 int err;
2473 char license[128];
2474 bool is_gpl;
2475
2476 if (CHECK_ATTR(BPF_PROG_LOAD))
2477 return -EINVAL;
2478
2479 if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
2480 BPF_F_ANY_ALIGNMENT |
2481 BPF_F_TEST_STATE_FREQ |
2482 BPF_F_SLEEPABLE |
2483 BPF_F_TEST_RND_HI32 |
2484 BPF_F_XDP_HAS_FRAGS))
2485 return -EINVAL;
2486
2487 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
2488 (attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
2489 !bpf_capable())
2490 return -EPERM;
2491
2492 /* copy eBPF program license from user space */
2493 if (strncpy_from_bpfptr(license,
2494 make_bpfptr(attr->license, uattr.is_kernel),
2495 sizeof(license) - 1) < 0)
2496 return -EFAULT;
2497 license[sizeof(license) - 1] = 0;
2498
2499 /* eBPF programs must be GPL compatible to use GPL-ed functions */
2500 is_gpl = license_is_gpl_compatible(license);
2501
2502 if (attr->insn_cnt == 0 ||
2503 attr->insn_cnt > (bpf_capable() ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
2504 return -E2BIG;
2505 if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
2506 type != BPF_PROG_TYPE_CGROUP_SKB &&
2507 !bpf_capable())
2508 return -EPERM;
2509
2510 if (is_net_admin_prog_type(type) && !capable(CAP_NET_ADMIN) && !capable(CAP_SYS_ADMIN))
2511 return -EPERM;
2512 if (is_perfmon_prog_type(type) && !perfmon_capable())
2513 return -EPERM;
2514
2515 /* attach_prog_fd/attach_btf_obj_fd can specify fd of either bpf_prog
2516 * or btf, we need to check which one it is
2517 */
2518 if (attr->attach_prog_fd) {
2519 dst_prog = bpf_prog_get(attr->attach_prog_fd);
2520 if (IS_ERR(dst_prog)) {
2521 dst_prog = NULL;
2522 attach_btf = btf_get_by_fd(attr->attach_btf_obj_fd);
2523 if (IS_ERR(attach_btf))
2524 return -EINVAL;
2525 if (!btf_is_kernel(attach_btf)) {
2526 /* attaching through specifying bpf_prog's BTF
2527 * objects directly might be supported eventually
2528 */
2529 btf_put(attach_btf);
2530 return -ENOTSUPP;
2531 }
2532 }
2533 } else if (attr->attach_btf_id) {
2534 /* fall back to vmlinux BTF, if BTF type ID is specified */
2535 attach_btf = bpf_get_btf_vmlinux();
2536 if (IS_ERR(attach_btf))
2537 return PTR_ERR(attach_btf);
2538 if (!attach_btf)
2539 return -EINVAL;
2540 btf_get(attach_btf);
2541 }
2542
2543 bpf_prog_load_fixup_attach_type(attr);
2544 if (bpf_prog_load_check_attach(type, attr->expected_attach_type,
2545 attach_btf, attr->attach_btf_id,
2546 dst_prog)) {
2547 if (dst_prog)
2548 bpf_prog_put(dst_prog);
2549 if (attach_btf)
2550 btf_put(attach_btf);
2551 return -EINVAL;
2552 }
2553
2554 /* plain bpf_prog allocation */
2555 prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
2556 if (!prog) {
2557 if (dst_prog)
2558 bpf_prog_put(dst_prog);
2559 if (attach_btf)
2560 btf_put(attach_btf);
2561 return -ENOMEM;
2562 }
2563
2564 prog->expected_attach_type = attr->expected_attach_type;
2565 prog->aux->attach_btf = attach_btf;
2566 prog->aux->attach_btf_id = attr->attach_btf_id;
2567 prog->aux->dst_prog = dst_prog;
2568 prog->aux->offload_requested = !!attr->prog_ifindex;
2569 prog->aux->sleepable = attr->prog_flags & BPF_F_SLEEPABLE;
2570 prog->aux->xdp_has_frags = attr->prog_flags & BPF_F_XDP_HAS_FRAGS;
2571
2572 err = security_bpf_prog_alloc(prog->aux);
2573 if (err)
2574 goto free_prog;
2575
2576 prog->aux->user = get_current_user();
2577 prog->len = attr->insn_cnt;
2578
2579 err = -EFAULT;
2580 if (copy_from_bpfptr(prog->insns,
2581 make_bpfptr(attr->insns, uattr.is_kernel),
2582 bpf_prog_insn_size(prog)) != 0)
2583 goto free_prog_sec;
2584
2585 prog->orig_prog = NULL;
2586 prog->jited = 0;
2587
2588 atomic64_set(&prog->aux->refcnt, 1);
2589 prog->gpl_compatible = is_gpl ? 1 : 0;
2590
2591 if (bpf_prog_is_dev_bound(prog->aux)) {
2592 err = bpf_prog_offload_init(prog, attr);
2593 if (err)
2594 goto free_prog_sec;
2595 }
2596
2597 /* find program type: socket_filter vs tracing_filter */
2598 err = find_prog_type(type, prog);
2599 if (err < 0)
2600 goto free_prog_sec;
2601
2602 prog->aux->load_time = ktime_get_boottime_ns();
2603 err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name,
2604 sizeof(attr->prog_name));
2605 if (err < 0)
2606 goto free_prog_sec;
2607
2608 /* run eBPF verifier */
2609 err = bpf_check(&prog, attr, uattr);
2610 if (err < 0)
2611 goto free_used_maps;
2612
2613 prog = bpf_prog_select_runtime(prog, &err);
2614 if (err < 0)
2615 goto free_used_maps;
2616
2617 err = bpf_prog_alloc_id(prog);
2618 if (err)
2619 goto free_used_maps;
2620
2621 /* Upon success of bpf_prog_alloc_id(), the BPF prog is
2622 * effectively publicly exposed. However, retrieving via
2623 * bpf_prog_get_fd_by_id() will take another reference,
2624 * therefore it cannot be gone underneath us.
2625 *
2626 * Only for the time /after/ successful bpf_prog_new_fd()
2627 * and before returning to userspace, we might just hold
2628 * one reference and any parallel close on that fd could
2629 * rip everything out. Hence, below notifications must
2630 * happen before bpf_prog_new_fd().
2631 *
2632 * Also, any failure handling from this point onwards must
2633 * be using bpf_prog_put() given the program is exposed.
2634 */
2635 bpf_prog_kallsyms_add(prog);
2636 perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
2637 bpf_audit_prog(prog, BPF_AUDIT_LOAD);
2638
2639 err = bpf_prog_new_fd(prog);
2640 if (err < 0)
2641 bpf_prog_put(prog);
2642 return err;
2643
2644free_used_maps:
2645 /* In case we have subprogs, we need to wait for a grace
2646 * period before we can tear down JIT memory since symbols
2647 * are already exposed under kallsyms.
2648 */
2649 __bpf_prog_put_noref(prog, prog->aux->func_cnt);
2650 return err;
2651free_prog_sec:
2652 free_uid(prog->aux->user);
2653 security_bpf_prog_free(prog->aux);
2654free_prog:
2655 if (prog->aux->attach_btf)
2656 btf_put(prog->aux->attach_btf);
2657 bpf_prog_free(prog);
2658 return err;
2659}
2660
2661#define BPF_OBJ_LAST_FIELD file_flags
2662
2663static int bpf_obj_pin(const union bpf_attr *attr)
2664{
2665 if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0)
2666 return -EINVAL;
2667
2668 return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname));
2669}
2670
2671static int bpf_obj_get(const union bpf_attr *attr)
2672{
2673 if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
2674 attr->file_flags & ~BPF_OBJ_FLAG_MASK)
2675 return -EINVAL;
2676
2677 return bpf_obj_get_user(u64_to_user_ptr(attr->pathname),
2678 attr->file_flags);
2679}
2680
2681void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2682 const struct bpf_link_ops *ops, struct bpf_prog *prog)
2683{
2684 atomic64_set(&link->refcnt, 1);
2685 link->type = type;
2686 link->id = 0;
2687 link->ops = ops;
2688 link->prog = prog;
2689}
2690
2691static void bpf_link_free_id(int id)
2692{
2693 if (!id)
2694 return;
2695
2696 spin_lock_bh(&link_idr_lock);
2697 idr_remove(&link_idr, id);
2698 spin_unlock_bh(&link_idr_lock);
2699}
2700
2701/* Clean up bpf_link and corresponding anon_inode file and FD. After
2702 * anon_inode is created, bpf_link can't be just kfree()'d due to deferred
2703 * anon_inode's release() call. This helper marksbpf_link as
2704 * defunct, releases anon_inode file and puts reserved FD. bpf_prog's refcnt
2705 * is not decremented, it's the responsibility of a calling code that failed
2706 * to complete bpf_link initialization.
2707 */
2708void bpf_link_cleanup(struct bpf_link_primer *primer)
2709{
2710 primer->link->prog = NULL;
2711 bpf_link_free_id(primer->id);
2712 fput(primer->file);
2713 put_unused_fd(primer->fd);
2714}
2715
2716void bpf_link_inc(struct bpf_link *link)
2717{
2718 atomic64_inc(&link->refcnt);
2719}
2720
2721/* bpf_link_free is guaranteed to be called from process context */
2722static void bpf_link_free(struct bpf_link *link)
2723{
2724 bpf_link_free_id(link->id);
2725 if (link->prog) {
2726 /* detach BPF program, clean up used resources */
2727 link->ops->release(link);
2728 bpf_prog_put(link->prog);
2729 }
2730 /* free bpf_link and its containing memory */
2731 link->ops->dealloc(link);
2732}
2733
2734static void bpf_link_put_deferred(struct work_struct *work)
2735{
2736 struct bpf_link *link = container_of(work, struct bpf_link, work);
2737
2738 bpf_link_free(link);
2739}
2740
2741/* bpf_link_put can be called from atomic context, but ensures that resources
2742 * are freed from process context
2743 */
2744void bpf_link_put(struct bpf_link *link)
2745{
2746 if (!atomic64_dec_and_test(&link->refcnt))
2747 return;
2748
2749 if (in_atomic()) {
2750 INIT_WORK(&link->work, bpf_link_put_deferred);
2751 schedule_work(&link->work);
2752 } else {
2753 bpf_link_free(link);
2754 }
2755}
2756EXPORT_SYMBOL(bpf_link_put);
2757
2758static int bpf_link_release(struct inode *inode, struct file *filp)
2759{
2760 struct bpf_link *link = filp->private_data;
2761
2762 bpf_link_put(link);
2763 return 0;
2764}
2765
2766#ifdef CONFIG_PROC_FS
2767#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
2768#define BPF_MAP_TYPE(_id, _ops)
2769#define BPF_LINK_TYPE(_id, _name) [_id] = #_name,
2770static const char *bpf_link_type_strs[] = {
2771 [BPF_LINK_TYPE_UNSPEC] = "<invalid>",
2772#include <linux/bpf_types.h>
2773};
2774#undef BPF_PROG_TYPE
2775#undef BPF_MAP_TYPE
2776#undef BPF_LINK_TYPE
2777
2778static void bpf_link_show_fdinfo(struct seq_file *m, struct file *filp)
2779{
2780 const struct bpf_link *link = filp->private_data;
2781 const struct bpf_prog *prog = link->prog;
2782 char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
2783
2784 bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
2785 seq_printf(m,
2786 "link_type:\t%s\n"
2787 "link_id:\t%u\n"
2788 "prog_tag:\t%s\n"
2789 "prog_id:\t%u\n",
2790 bpf_link_type_strs[link->type],
2791 link->id,
2792 prog_tag,
2793 prog->aux->id);
2794 if (link->ops->show_fdinfo)
2795 link->ops->show_fdinfo(link, m);
2796}
2797#endif
2798
2799static const struct file_operations bpf_link_fops = {
2800#ifdef CONFIG_PROC_FS
2801 .show_fdinfo = bpf_link_show_fdinfo,
2802#endif
2803 .release = bpf_link_release,
2804 .read = bpf_dummy_read,
2805 .write = bpf_dummy_write,
2806};
2807
2808static int bpf_link_alloc_id(struct bpf_link *link)
2809{
2810 int id;
2811
2812 idr_preload(GFP_KERNEL);
2813 spin_lock_bh(&link_idr_lock);
2814 id = idr_alloc_cyclic(&link_idr, link, 1, INT_MAX, GFP_ATOMIC);
2815 spin_unlock_bh(&link_idr_lock);
2816 idr_preload_end();
2817
2818 return id;
2819}
2820
2821/* Prepare bpf_link to be exposed to user-space by allocating anon_inode file,
2822 * reserving unused FD and allocating ID from link_idr. This is to be paired
2823 * with bpf_link_settle() to install FD and ID and expose bpf_link to
2824 * user-space, if bpf_link is successfully attached. If not, bpf_link and
2825 * pre-allocated resources are to be freed with bpf_cleanup() call. All the
2826 * transient state is passed around in struct bpf_link_primer.
2827 * This is preferred way to create and initialize bpf_link, especially when
2828 * there are complicated and expensive operations in between creating bpf_link
2829 * itself and attaching it to BPF hook. By using bpf_link_prime() and
2830 * bpf_link_settle() kernel code using bpf_link doesn't have to perform
2831 * expensive (and potentially failing) roll back operations in a rare case
2832 * that file, FD, or ID can't be allocated.
2833 */
2834int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer)
2835{
2836 struct file *file;
2837 int fd, id;
2838
2839 fd = get_unused_fd_flags(O_CLOEXEC);
2840 if (fd < 0)
2841 return fd;
2842
2843
2844 id = bpf_link_alloc_id(link);
2845 if (id < 0) {
2846 put_unused_fd(fd);
2847 return id;
2848 }
2849
2850 file = anon_inode_getfile("bpf_link", &bpf_link_fops, link, O_CLOEXEC);
2851 if (IS_ERR(file)) {
2852 bpf_link_free_id(id);
2853 put_unused_fd(fd);
2854 return PTR_ERR(file);
2855 }
2856
2857 primer->link = link;
2858 primer->file = file;
2859 primer->fd = fd;
2860 primer->id = id;
2861 return 0;
2862}
2863
2864int bpf_link_settle(struct bpf_link_primer *primer)
2865{
2866 /* make bpf_link fetchable by ID */
2867 spin_lock_bh(&link_idr_lock);
2868 primer->link->id = primer->id;
2869 spin_unlock_bh(&link_idr_lock);
2870 /* make bpf_link fetchable by FD */
2871 fd_install(primer->fd, primer->file);
2872 /* pass through installed FD */
2873 return primer->fd;
2874}
2875
2876int bpf_link_new_fd(struct bpf_link *link)
2877{
2878 return anon_inode_getfd("bpf-link", &bpf_link_fops, link, O_CLOEXEC);
2879}
2880
2881struct bpf_link *bpf_link_get_from_fd(u32 ufd)
2882{
2883 struct fd f = fdget(ufd);
2884 struct bpf_link *link;
2885
2886 if (!f.file)
2887 return ERR_PTR(-EBADF);
2888 if (f.file->f_op != &bpf_link_fops) {
2889 fdput(f);
2890 return ERR_PTR(-EINVAL);
2891 }
2892
2893 link = f.file->private_data;
2894 bpf_link_inc(link);
2895 fdput(f);
2896
2897 return link;
2898}
2899EXPORT_SYMBOL(bpf_link_get_from_fd);
2900
2901static void bpf_tracing_link_release(struct bpf_link *link)
2902{
2903 struct bpf_tracing_link *tr_link =
2904 container_of(link, struct bpf_tracing_link, link.link);
2905
2906 WARN_ON_ONCE(bpf_trampoline_unlink_prog(&tr_link->link,
2907 tr_link->trampoline));
2908
2909 bpf_trampoline_put(tr_link->trampoline);
2910
2911 /* tgt_prog is NULL if target is a kernel function */
2912 if (tr_link->tgt_prog)
2913 bpf_prog_put(tr_link->tgt_prog);
2914}
2915
2916static void bpf_tracing_link_dealloc(struct bpf_link *link)
2917{
2918 struct bpf_tracing_link *tr_link =
2919 container_of(link, struct bpf_tracing_link, link.link);
2920
2921 kfree(tr_link);
2922}
2923
2924static void bpf_tracing_link_show_fdinfo(const struct bpf_link *link,
2925 struct seq_file *seq)
2926{
2927 struct bpf_tracing_link *tr_link =
2928 container_of(link, struct bpf_tracing_link, link.link);
2929
2930 seq_printf(seq,
2931 "attach_type:\t%d\n",
2932 tr_link->attach_type);
2933}
2934
2935static int bpf_tracing_link_fill_link_info(const struct bpf_link *link,
2936 struct bpf_link_info *info)
2937{
2938 struct bpf_tracing_link *tr_link =
2939 container_of(link, struct bpf_tracing_link, link.link);
2940
2941 info->tracing.attach_type = tr_link->attach_type;
2942 bpf_trampoline_unpack_key(tr_link->trampoline->key,
2943 &info->tracing.target_obj_id,
2944 &info->tracing.target_btf_id);
2945
2946 return 0;
2947}
2948
2949static const struct bpf_link_ops bpf_tracing_link_lops = {
2950 .release = bpf_tracing_link_release,
2951 .dealloc = bpf_tracing_link_dealloc,
2952 .show_fdinfo = bpf_tracing_link_show_fdinfo,
2953 .fill_link_info = bpf_tracing_link_fill_link_info,
2954};
2955
2956static int bpf_tracing_prog_attach(struct bpf_prog *prog,
2957 int tgt_prog_fd,
2958 u32 btf_id,
2959 u64 bpf_cookie)
2960{
2961 struct bpf_link_primer link_primer;
2962 struct bpf_prog *tgt_prog = NULL;
2963 struct bpf_trampoline *tr = NULL;
2964 struct bpf_tracing_link *link;
2965 u64 key = 0;
2966 int err;
2967
2968 switch (prog->type) {
2969 case BPF_PROG_TYPE_TRACING:
2970 if (prog->expected_attach_type != BPF_TRACE_FENTRY &&
2971 prog->expected_attach_type != BPF_TRACE_FEXIT &&
2972 prog->expected_attach_type != BPF_MODIFY_RETURN) {
2973 err = -EINVAL;
2974 goto out_put_prog;
2975 }
2976 break;
2977 case BPF_PROG_TYPE_EXT:
2978 if (prog->expected_attach_type != 0) {
2979 err = -EINVAL;
2980 goto out_put_prog;
2981 }
2982 break;
2983 case BPF_PROG_TYPE_LSM:
2984 if (prog->expected_attach_type != BPF_LSM_MAC) {
2985 err = -EINVAL;
2986 goto out_put_prog;
2987 }
2988 break;
2989 default:
2990 err = -EINVAL;
2991 goto out_put_prog;
2992 }
2993
2994 if (!!tgt_prog_fd != !!btf_id) {
2995 err = -EINVAL;
2996 goto out_put_prog;
2997 }
2998
2999 if (tgt_prog_fd) {
3000 /* For now we only allow new targets for BPF_PROG_TYPE_EXT */
3001 if (prog->type != BPF_PROG_TYPE_EXT) {
3002 err = -EINVAL;
3003 goto out_put_prog;
3004 }
3005
3006 tgt_prog = bpf_prog_get(tgt_prog_fd);
3007 if (IS_ERR(tgt_prog)) {
3008 err = PTR_ERR(tgt_prog);
3009 tgt_prog = NULL;
3010 goto out_put_prog;
3011 }
3012
3013 key = bpf_trampoline_compute_key(tgt_prog, NULL, btf_id);
3014 }
3015
3016 link = kzalloc(sizeof(*link), GFP_USER);
3017 if (!link) {
3018 err = -ENOMEM;
3019 goto out_put_prog;
3020 }
3021 bpf_link_init(&link->link.link, BPF_LINK_TYPE_TRACING,
3022 &bpf_tracing_link_lops, prog);
3023 link->attach_type = prog->expected_attach_type;
3024 link->link.cookie = bpf_cookie;
3025
3026 mutex_lock(&prog->aux->dst_mutex);
3027
3028 /* There are a few possible cases here:
3029 *
3030 * - if prog->aux->dst_trampoline is set, the program was just loaded
3031 * and not yet attached to anything, so we can use the values stored
3032 * in prog->aux
3033 *
3034 * - if prog->aux->dst_trampoline is NULL, the program has already been
3035 * attached to a target and its initial target was cleared (below)
3036 *
3037 * - if tgt_prog != NULL, the caller specified tgt_prog_fd +
3038 * target_btf_id using the link_create API.
3039 *
3040 * - if tgt_prog == NULL when this function was called using the old
3041 * raw_tracepoint_open API, and we need a target from prog->aux
3042 *
3043 * - if prog->aux->dst_trampoline and tgt_prog is NULL, the program
3044 * was detached and is going for re-attachment.
3045 */
3046 if (!prog->aux->dst_trampoline && !tgt_prog) {
3047 /*
3048 * Allow re-attach for TRACING and LSM programs. If it's
3049 * currently linked, bpf_trampoline_link_prog will fail.
3050 * EXT programs need to specify tgt_prog_fd, so they
3051 * re-attach in separate code path.
3052 */
3053 if (prog->type != BPF_PROG_TYPE_TRACING &&
3054 prog->type != BPF_PROG_TYPE_LSM) {
3055 err = -EINVAL;
3056 goto out_unlock;
3057 }
3058 btf_id = prog->aux->attach_btf_id;
3059 key = bpf_trampoline_compute_key(NULL, prog->aux->attach_btf, btf_id);
3060 }
3061
3062 if (!prog->aux->dst_trampoline ||
3063 (key && key != prog->aux->dst_trampoline->key)) {
3064 /* If there is no saved target, or the specified target is
3065 * different from the destination specified at load time, we
3066 * need a new trampoline and a check for compatibility
3067 */
3068 struct bpf_attach_target_info tgt_info = {};
3069
3070 err = bpf_check_attach_target(NULL, prog, tgt_prog, btf_id,
3071 &tgt_info);
3072 if (err)
3073 goto out_unlock;
3074
3075 tr = bpf_trampoline_get(key, &tgt_info);
3076 if (!tr) {
3077 err = -ENOMEM;
3078 goto out_unlock;
3079 }
3080 } else {
3081 /* The caller didn't specify a target, or the target was the
3082 * same as the destination supplied during program load. This
3083 * means we can reuse the trampoline and reference from program
3084 * load time, and there is no need to allocate a new one. This
3085 * can only happen once for any program, as the saved values in
3086 * prog->aux are cleared below.
3087 */
3088 tr = prog->aux->dst_trampoline;
3089 tgt_prog = prog->aux->dst_prog;
3090 }
3091
3092 err = bpf_link_prime(&link->link.link, &link_primer);
3093 if (err)
3094 goto out_unlock;
3095
3096 err = bpf_trampoline_link_prog(&link->link, tr);
3097 if (err) {
3098 bpf_link_cleanup(&link_primer);
3099 link = NULL;
3100 goto out_unlock;
3101 }
3102
3103 link->tgt_prog = tgt_prog;
3104 link->trampoline = tr;
3105
3106 /* Always clear the trampoline and target prog from prog->aux to make
3107 * sure the original attach destination is not kept alive after a
3108 * program is (re-)attached to another target.
3109 */
3110 if (prog->aux->dst_prog &&
3111 (tgt_prog_fd || tr != prog->aux->dst_trampoline))
3112 /* got extra prog ref from syscall, or attaching to different prog */
3113 bpf_prog_put(prog->aux->dst_prog);
3114 if (prog->aux->dst_trampoline && tr != prog->aux->dst_trampoline)
3115 /* we allocated a new trampoline, so free the old one */
3116 bpf_trampoline_put(prog->aux->dst_trampoline);
3117
3118 prog->aux->dst_prog = NULL;
3119 prog->aux->dst_trampoline = NULL;
3120 mutex_unlock(&prog->aux->dst_mutex);
3121
3122 return bpf_link_settle(&link_primer);
3123out_unlock:
3124 if (tr && tr != prog->aux->dst_trampoline)
3125 bpf_trampoline_put(tr);
3126 mutex_unlock(&prog->aux->dst_mutex);
3127 kfree(link);
3128out_put_prog:
3129 if (tgt_prog_fd && tgt_prog)
3130 bpf_prog_put(tgt_prog);
3131 return err;
3132}
3133
3134struct bpf_raw_tp_link {
3135 struct bpf_link link;
3136 struct bpf_raw_event_map *btp;
3137};
3138
3139static void bpf_raw_tp_link_release(struct bpf_link *link)
3140{
3141 struct bpf_raw_tp_link *raw_tp =
3142 container_of(link, struct bpf_raw_tp_link, link);
3143
3144 bpf_probe_unregister(raw_tp->btp, raw_tp->link.prog);
3145 bpf_put_raw_tracepoint(raw_tp->btp);
3146}
3147
3148static void bpf_raw_tp_link_dealloc(struct bpf_link *link)
3149{
3150 struct bpf_raw_tp_link *raw_tp =
3151 container_of(link, struct bpf_raw_tp_link, link);
3152
3153 kfree(raw_tp);
3154}
3155
3156static void bpf_raw_tp_link_show_fdinfo(const struct bpf_link *link,
3157 struct seq_file *seq)
3158{
3159 struct bpf_raw_tp_link *raw_tp_link =
3160 container_of(link, struct bpf_raw_tp_link, link);
3161
3162 seq_printf(seq,
3163 "tp_name:\t%s\n",
3164 raw_tp_link->btp->tp->name);
3165}
3166
3167static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
3168 struct bpf_link_info *info)
3169{
3170 struct bpf_raw_tp_link *raw_tp_link =
3171 container_of(link, struct bpf_raw_tp_link, link);
3172 char __user *ubuf = u64_to_user_ptr(info->raw_tracepoint.tp_name);
3173 const char *tp_name = raw_tp_link->btp->tp->name;
3174 u32 ulen = info->raw_tracepoint.tp_name_len;
3175 size_t tp_len = strlen(tp_name);
3176
3177 if (!ulen ^ !ubuf)
3178 return -EINVAL;
3179
3180 info->raw_tracepoint.tp_name_len = tp_len + 1;
3181
3182 if (!ubuf)
3183 return 0;
3184
3185 if (ulen >= tp_len + 1) {
3186 if (copy_to_user(ubuf, tp_name, tp_len + 1))
3187 return -EFAULT;
3188 } else {
3189 char zero = '\0';
3190
3191 if (copy_to_user(ubuf, tp_name, ulen - 1))
3192 return -EFAULT;
3193 if (put_user(zero, ubuf + ulen - 1))
3194 return -EFAULT;
3195 return -ENOSPC;
3196 }
3197
3198 return 0;
3199}
3200
3201static const struct bpf_link_ops bpf_raw_tp_link_lops = {
3202 .release = bpf_raw_tp_link_release,
3203 .dealloc = bpf_raw_tp_link_dealloc,
3204 .show_fdinfo = bpf_raw_tp_link_show_fdinfo,
3205 .fill_link_info = bpf_raw_tp_link_fill_link_info,
3206};
3207
3208#ifdef CONFIG_PERF_EVENTS
3209struct bpf_perf_link {
3210 struct bpf_link link;
3211 struct file *perf_file;
3212};
3213
3214static void bpf_perf_link_release(struct bpf_link *link)
3215{
3216 struct bpf_perf_link *perf_link = container_of(link, struct bpf_perf_link, link);
3217 struct perf_event *event = perf_link->perf_file->private_data;
3218
3219 perf_event_free_bpf_prog(event);
3220 fput(perf_link->perf_file);
3221}
3222
3223static void bpf_perf_link_dealloc(struct bpf_link *link)
3224{
3225 struct bpf_perf_link *perf_link = container_of(link, struct bpf_perf_link, link);
3226
3227 kfree(perf_link);
3228}
3229
3230static const struct bpf_link_ops bpf_perf_link_lops = {
3231 .release = bpf_perf_link_release,
3232 .dealloc = bpf_perf_link_dealloc,
3233};
3234
3235static int bpf_perf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
3236{
3237 struct bpf_link_primer link_primer;
3238 struct bpf_perf_link *link;
3239 struct perf_event *event;
3240 struct file *perf_file;
3241 int err;
3242
3243 if (attr->link_create.flags)
3244 return -EINVAL;
3245
3246 perf_file = perf_event_get(attr->link_create.target_fd);
3247 if (IS_ERR(perf_file))
3248 return PTR_ERR(perf_file);
3249
3250 link = kzalloc(sizeof(*link), GFP_USER);
3251 if (!link) {
3252 err = -ENOMEM;
3253 goto out_put_file;
3254 }
3255 bpf_link_init(&link->link, BPF_LINK_TYPE_PERF_EVENT, &bpf_perf_link_lops, prog);
3256 link->perf_file = perf_file;
3257
3258 err = bpf_link_prime(&link->link, &link_primer);
3259 if (err) {
3260 kfree(link);
3261 goto out_put_file;
3262 }
3263
3264 event = perf_file->private_data;
3265 err = perf_event_set_bpf_prog(event, prog, attr->link_create.perf_event.bpf_cookie);
3266 if (err) {
3267 bpf_link_cleanup(&link_primer);
3268 goto out_put_file;
3269 }
3270 /* perf_event_set_bpf_prog() doesn't take its own refcnt on prog */
3271 bpf_prog_inc(prog);
3272
3273 return bpf_link_settle(&link_primer);
3274
3275out_put_file:
3276 fput(perf_file);
3277 return err;
3278}
3279#else
3280static int bpf_perf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
3281{
3282 return -EOPNOTSUPP;
3283}
3284#endif /* CONFIG_PERF_EVENTS */
3285
3286static int bpf_raw_tp_link_attach(struct bpf_prog *prog,
3287 const char __user *user_tp_name)
3288{
3289 struct bpf_link_primer link_primer;
3290 struct bpf_raw_tp_link *link;
3291 struct bpf_raw_event_map *btp;
3292 const char *tp_name;
3293 char buf[128];
3294 int err;
3295
3296 switch (prog->type) {
3297 case BPF_PROG_TYPE_TRACING:
3298 case BPF_PROG_TYPE_EXT:
3299 case BPF_PROG_TYPE_LSM:
3300 if (user_tp_name)
3301 /* The attach point for this category of programs
3302 * should be specified via btf_id during program load.
3303 */
3304 return -EINVAL;
3305 if (prog->type == BPF_PROG_TYPE_TRACING &&
3306 prog->expected_attach_type == BPF_TRACE_RAW_TP) {
3307 tp_name = prog->aux->attach_func_name;
3308 break;
3309 }
3310 return bpf_tracing_prog_attach(prog, 0, 0, 0);
3311 case BPF_PROG_TYPE_RAW_TRACEPOINT:
3312 case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
3313 if (strncpy_from_user(buf, user_tp_name, sizeof(buf) - 1) < 0)
3314 return -EFAULT;
3315 buf[sizeof(buf) - 1] = 0;
3316 tp_name = buf;
3317 break;
3318 default:
3319 return -EINVAL;
3320 }
3321
3322 btp = bpf_get_raw_tracepoint(tp_name);
3323 if (!btp)
3324 return -ENOENT;
3325
3326 link = kzalloc(sizeof(*link), GFP_USER);
3327 if (!link) {
3328 err = -ENOMEM;
3329 goto out_put_btp;
3330 }
3331 bpf_link_init(&link->link, BPF_LINK_TYPE_RAW_TRACEPOINT,
3332 &bpf_raw_tp_link_lops, prog);
3333 link->btp = btp;
3334
3335 err = bpf_link_prime(&link->link, &link_primer);
3336 if (err) {
3337 kfree(link);
3338 goto out_put_btp;
3339 }
3340
3341 err = bpf_probe_register(link->btp, prog);
3342 if (err) {
3343 bpf_link_cleanup(&link_primer);
3344 goto out_put_btp;
3345 }
3346
3347 return bpf_link_settle(&link_primer);
3348
3349out_put_btp:
3350 bpf_put_raw_tracepoint(btp);
3351 return err;
3352}
3353
3354#define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd
3355
3356static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
3357{
3358 struct bpf_prog *prog;
3359 int fd;
3360
3361 if (CHECK_ATTR(BPF_RAW_TRACEPOINT_OPEN))
3362 return -EINVAL;
3363
3364 prog = bpf_prog_get(attr->raw_tracepoint.prog_fd);
3365 if (IS_ERR(prog))
3366 return PTR_ERR(prog);
3367
3368 fd = bpf_raw_tp_link_attach(prog, u64_to_user_ptr(attr->raw_tracepoint.name));
3369 if (fd < 0)
3370 bpf_prog_put(prog);
3371 return fd;
3372}
3373
3374static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
3375 enum bpf_attach_type attach_type)
3376{
3377 switch (prog->type) {
3378 case BPF_PROG_TYPE_CGROUP_SOCK:
3379 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
3380 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
3381 case BPF_PROG_TYPE_SK_LOOKUP:
3382 return attach_type == prog->expected_attach_type ? 0 : -EINVAL;
3383 case BPF_PROG_TYPE_CGROUP_SKB:
3384 if (!capable(CAP_NET_ADMIN))
3385 /* cg-skb progs can be loaded by unpriv user.
3386 * check permissions at attach time.
3387 */
3388 return -EPERM;
3389 return prog->enforce_expected_attach_type &&
3390 prog->expected_attach_type != attach_type ?
3391 -EINVAL : 0;
3392 default:
3393 return 0;
3394 }
3395}
3396
3397static enum bpf_prog_type
3398attach_type_to_prog_type(enum bpf_attach_type attach_type)
3399{
3400 switch (attach_type) {
3401 case BPF_CGROUP_INET_INGRESS:
3402 case BPF_CGROUP_INET_EGRESS:
3403 return BPF_PROG_TYPE_CGROUP_SKB;
3404 case BPF_CGROUP_INET_SOCK_CREATE:
3405 case BPF_CGROUP_INET_SOCK_RELEASE:
3406 case BPF_CGROUP_INET4_POST_BIND:
3407 case BPF_CGROUP_INET6_POST_BIND:
3408 return BPF_PROG_TYPE_CGROUP_SOCK;
3409 case BPF_CGROUP_INET4_BIND:
3410 case BPF_CGROUP_INET6_BIND:
3411 case BPF_CGROUP_INET4_CONNECT:
3412 case BPF_CGROUP_INET6_CONNECT:
3413 case BPF_CGROUP_INET4_GETPEERNAME:
3414 case BPF_CGROUP_INET6_GETPEERNAME:
3415 case BPF_CGROUP_INET4_GETSOCKNAME:
3416 case BPF_CGROUP_INET6_GETSOCKNAME:
3417 case BPF_CGROUP_UDP4_SENDMSG:
3418 case BPF_CGROUP_UDP6_SENDMSG:
3419 case BPF_CGROUP_UDP4_RECVMSG:
3420 case BPF_CGROUP_UDP6_RECVMSG:
3421 return BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
3422 case BPF_CGROUP_SOCK_OPS:
3423 return BPF_PROG_TYPE_SOCK_OPS;
3424 case BPF_CGROUP_DEVICE:
3425 return BPF_PROG_TYPE_CGROUP_DEVICE;
3426 case BPF_SK_MSG_VERDICT:
3427 return BPF_PROG_TYPE_SK_MSG;
3428 case BPF_SK_SKB_STREAM_PARSER:
3429 case BPF_SK_SKB_STREAM_VERDICT:
3430 case BPF_SK_SKB_VERDICT:
3431 return BPF_PROG_TYPE_SK_SKB;
3432 case BPF_LIRC_MODE2:
3433 return BPF_PROG_TYPE_LIRC_MODE2;
3434 case BPF_FLOW_DISSECTOR:
3435 return BPF_PROG_TYPE_FLOW_DISSECTOR;
3436 case BPF_CGROUP_SYSCTL:
3437 return BPF_PROG_TYPE_CGROUP_SYSCTL;
3438 case BPF_CGROUP_GETSOCKOPT:
3439 case BPF_CGROUP_SETSOCKOPT:
3440 return BPF_PROG_TYPE_CGROUP_SOCKOPT;
3441 case BPF_TRACE_ITER:
3442 case BPF_TRACE_RAW_TP:
3443 case BPF_TRACE_FENTRY:
3444 case BPF_TRACE_FEXIT:
3445 case BPF_MODIFY_RETURN:
3446 return BPF_PROG_TYPE_TRACING;
3447 case BPF_LSM_MAC:
3448 return BPF_PROG_TYPE_LSM;
3449 case BPF_SK_LOOKUP:
3450 return BPF_PROG_TYPE_SK_LOOKUP;
3451 case BPF_XDP:
3452 return BPF_PROG_TYPE_XDP;
3453 case BPF_LSM_CGROUP:
3454 return BPF_PROG_TYPE_LSM;
3455 default:
3456 return BPF_PROG_TYPE_UNSPEC;
3457 }
3458}
3459
3460#define BPF_PROG_ATTACH_LAST_FIELD replace_bpf_fd
3461
3462#define BPF_F_ATTACH_MASK \
3463 (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI | BPF_F_REPLACE)
3464
3465static int bpf_prog_attach(const union bpf_attr *attr)
3466{
3467 enum bpf_prog_type ptype;
3468 struct bpf_prog *prog;
3469 int ret;
3470
3471 if (CHECK_ATTR(BPF_PROG_ATTACH))
3472 return -EINVAL;
3473
3474 if (attr->attach_flags & ~BPF_F_ATTACH_MASK)
3475 return -EINVAL;
3476
3477 ptype = attach_type_to_prog_type(attr->attach_type);
3478 if (ptype == BPF_PROG_TYPE_UNSPEC)
3479 return -EINVAL;
3480
3481 prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
3482 if (IS_ERR(prog))
3483 return PTR_ERR(prog);
3484
3485 if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) {
3486 bpf_prog_put(prog);
3487 return -EINVAL;
3488 }
3489
3490 switch (ptype) {
3491 case BPF_PROG_TYPE_SK_SKB:
3492 case BPF_PROG_TYPE_SK_MSG:
3493 ret = sock_map_get_from_fd(attr, prog);
3494 break;
3495 case BPF_PROG_TYPE_LIRC_MODE2:
3496 ret = lirc_prog_attach(attr, prog);
3497 break;
3498 case BPF_PROG_TYPE_FLOW_DISSECTOR:
3499 ret = netns_bpf_prog_attach(attr, prog);
3500 break;
3501 case BPF_PROG_TYPE_CGROUP_DEVICE:
3502 case BPF_PROG_TYPE_CGROUP_SKB:
3503 case BPF_PROG_TYPE_CGROUP_SOCK:
3504 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
3505 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
3506 case BPF_PROG_TYPE_CGROUP_SYSCTL:
3507 case BPF_PROG_TYPE_SOCK_OPS:
3508 case BPF_PROG_TYPE_LSM:
3509 if (ptype == BPF_PROG_TYPE_LSM &&
3510 prog->expected_attach_type != BPF_LSM_CGROUP)
3511 ret = -EINVAL;
3512 else
3513 ret = cgroup_bpf_prog_attach(attr, ptype, prog);
3514 break;
3515 default:
3516 ret = -EINVAL;
3517 }
3518
3519 if (ret)
3520 bpf_prog_put(prog);
3521 return ret;
3522}
3523
3524#define BPF_PROG_DETACH_LAST_FIELD attach_type
3525
3526static int bpf_prog_detach(const union bpf_attr *attr)
3527{
3528 enum bpf_prog_type ptype;
3529
3530 if (CHECK_ATTR(BPF_PROG_DETACH))
3531 return -EINVAL;
3532
3533 ptype = attach_type_to_prog_type(attr->attach_type);
3534
3535 switch (ptype) {
3536 case BPF_PROG_TYPE_SK_MSG:
3537 case BPF_PROG_TYPE_SK_SKB:
3538 return sock_map_prog_detach(attr, ptype);
3539 case BPF_PROG_TYPE_LIRC_MODE2:
3540 return lirc_prog_detach(attr);
3541 case BPF_PROG_TYPE_FLOW_DISSECTOR:
3542 return netns_bpf_prog_detach(attr, ptype);
3543 case BPF_PROG_TYPE_CGROUP_DEVICE:
3544 case BPF_PROG_TYPE_CGROUP_SKB:
3545 case BPF_PROG_TYPE_CGROUP_SOCK:
3546 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
3547 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
3548 case BPF_PROG_TYPE_CGROUP_SYSCTL:
3549 case BPF_PROG_TYPE_SOCK_OPS:
3550 case BPF_PROG_TYPE_LSM:
3551 return cgroup_bpf_prog_detach(attr, ptype);
3552 default:
3553 return -EINVAL;
3554 }
3555}
3556
3557#define BPF_PROG_QUERY_LAST_FIELD query.prog_attach_flags
3558
3559static int bpf_prog_query(const union bpf_attr *attr,
3560 union bpf_attr __user *uattr)
3561{
3562 if (!capable(CAP_NET_ADMIN))
3563 return -EPERM;
3564 if (CHECK_ATTR(BPF_PROG_QUERY))
3565 return -EINVAL;
3566 if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
3567 return -EINVAL;
3568
3569 switch (attr->query.attach_type) {
3570 case BPF_CGROUP_INET_INGRESS:
3571 case BPF_CGROUP_INET_EGRESS:
3572 case BPF_CGROUP_INET_SOCK_CREATE:
3573 case BPF_CGROUP_INET_SOCK_RELEASE:
3574 case BPF_CGROUP_INET4_BIND:
3575 case BPF_CGROUP_INET6_BIND:
3576 case BPF_CGROUP_INET4_POST_BIND:
3577 case BPF_CGROUP_INET6_POST_BIND:
3578 case BPF_CGROUP_INET4_CONNECT:
3579 case BPF_CGROUP_INET6_CONNECT:
3580 case BPF_CGROUP_INET4_GETPEERNAME:
3581 case BPF_CGROUP_INET6_GETPEERNAME:
3582 case BPF_CGROUP_INET4_GETSOCKNAME:
3583 case BPF_CGROUP_INET6_GETSOCKNAME:
3584 case BPF_CGROUP_UDP4_SENDMSG:
3585 case BPF_CGROUP_UDP6_SENDMSG:
3586 case BPF_CGROUP_UDP4_RECVMSG:
3587 case BPF_CGROUP_UDP6_RECVMSG:
3588 case BPF_CGROUP_SOCK_OPS:
3589 case BPF_CGROUP_DEVICE:
3590 case BPF_CGROUP_SYSCTL:
3591 case BPF_CGROUP_GETSOCKOPT:
3592 case BPF_CGROUP_SETSOCKOPT:
3593 case BPF_LSM_CGROUP:
3594 return cgroup_bpf_prog_query(attr, uattr);
3595 case BPF_LIRC_MODE2:
3596 return lirc_prog_query(attr, uattr);
3597 case BPF_FLOW_DISSECTOR:
3598 case BPF_SK_LOOKUP:
3599 return netns_bpf_prog_query(attr, uattr);
3600 case BPF_SK_SKB_STREAM_PARSER:
3601 case BPF_SK_SKB_STREAM_VERDICT:
3602 case BPF_SK_MSG_VERDICT:
3603 case BPF_SK_SKB_VERDICT:
3604 return sock_map_bpf_prog_query(attr, uattr);
3605 default:
3606 return -EINVAL;
3607 }
3608}
3609
3610#define BPF_PROG_TEST_RUN_LAST_FIELD test.batch_size
3611
3612static int bpf_prog_test_run(const union bpf_attr *attr,
3613 union bpf_attr __user *uattr)
3614{
3615 struct bpf_prog *prog;
3616 int ret = -ENOTSUPP;
3617
3618 if (CHECK_ATTR(BPF_PROG_TEST_RUN))
3619 return -EINVAL;
3620
3621 if ((attr->test.ctx_size_in && !attr->test.ctx_in) ||
3622 (!attr->test.ctx_size_in && attr->test.ctx_in))
3623 return -EINVAL;
3624
3625 if ((attr->test.ctx_size_out && !attr->test.ctx_out) ||
3626 (!attr->test.ctx_size_out && attr->test.ctx_out))
3627 return -EINVAL;
3628
3629 prog = bpf_prog_get(attr->test.prog_fd);
3630 if (IS_ERR(prog))
3631 return PTR_ERR(prog);
3632
3633 if (prog->aux->ops->test_run)
3634 ret = prog->aux->ops->test_run(prog, attr, uattr);
3635
3636 bpf_prog_put(prog);
3637 return ret;
3638}
3639
3640#define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
3641
3642static int bpf_obj_get_next_id(const union bpf_attr *attr,
3643 union bpf_attr __user *uattr,
3644 struct idr *idr,
3645 spinlock_t *lock)
3646{
3647 u32 next_id = attr->start_id;
3648 int err = 0;
3649
3650 if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
3651 return -EINVAL;
3652
3653 if (!capable(CAP_SYS_ADMIN))
3654 return -EPERM;
3655
3656 next_id++;
3657 spin_lock_bh(lock);
3658 if (!idr_get_next(idr, &next_id))
3659 err = -ENOENT;
3660 spin_unlock_bh(lock);
3661
3662 if (!err)
3663 err = put_user(next_id, &uattr->next_id);
3664
3665 return err;
3666}
3667
3668struct bpf_map *bpf_map_get_curr_or_next(u32 *id)
3669{
3670 struct bpf_map *map;
3671
3672 spin_lock_bh(&map_idr_lock);
3673again:
3674 map = idr_get_next(&map_idr, id);
3675 if (map) {
3676 map = __bpf_map_inc_not_zero(map, false);
3677 if (IS_ERR(map)) {
3678 (*id)++;
3679 goto again;
3680 }
3681 }
3682 spin_unlock_bh(&map_idr_lock);
3683
3684 return map;
3685}
3686
3687struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id)
3688{
3689 struct bpf_prog *prog;
3690
3691 spin_lock_bh(&prog_idr_lock);
3692again:
3693 prog = idr_get_next(&prog_idr, id);
3694 if (prog) {
3695 prog = bpf_prog_inc_not_zero(prog);
3696 if (IS_ERR(prog)) {
3697 (*id)++;
3698 goto again;
3699 }
3700 }
3701 spin_unlock_bh(&prog_idr_lock);
3702
3703 return prog;
3704}
3705
3706#define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
3707
3708struct bpf_prog *bpf_prog_by_id(u32 id)
3709{
3710 struct bpf_prog *prog;
3711
3712 if (!id)
3713 return ERR_PTR(-ENOENT);
3714
3715 spin_lock_bh(&prog_idr_lock);
3716 prog = idr_find(&prog_idr, id);
3717 if (prog)
3718 prog = bpf_prog_inc_not_zero(prog);
3719 else
3720 prog = ERR_PTR(-ENOENT);
3721 spin_unlock_bh(&prog_idr_lock);
3722 return prog;
3723}
3724
3725static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
3726{
3727 struct bpf_prog *prog;
3728 u32 id = attr->prog_id;
3729 int fd;
3730
3731 if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
3732 return -EINVAL;
3733
3734 if (!capable(CAP_SYS_ADMIN))
3735 return -EPERM;
3736
3737 prog = bpf_prog_by_id(id);
3738 if (IS_ERR(prog))
3739 return PTR_ERR(prog);
3740
3741 fd = bpf_prog_new_fd(prog);
3742 if (fd < 0)
3743 bpf_prog_put(prog);
3744
3745 return fd;
3746}
3747
3748#define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
3749
3750static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
3751{
3752 struct bpf_map *map;
3753 u32 id = attr->map_id;
3754 int f_flags;
3755 int fd;
3756
3757 if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
3758 attr->open_flags & ~BPF_OBJ_FLAG_MASK)
3759 return -EINVAL;
3760
3761 if (!capable(CAP_SYS_ADMIN))
3762 return -EPERM;
3763
3764 f_flags = bpf_get_file_flag(attr->open_flags);
3765 if (f_flags < 0)
3766 return f_flags;
3767
3768 spin_lock_bh(&map_idr_lock);
3769 map = idr_find(&map_idr, id);
3770 if (map)
3771 map = __bpf_map_inc_not_zero(map, true);
3772 else
3773 map = ERR_PTR(-ENOENT);
3774 spin_unlock_bh(&map_idr_lock);
3775
3776 if (IS_ERR(map))
3777 return PTR_ERR(map);
3778
3779 fd = bpf_map_new_fd(map, f_flags);
3780 if (fd < 0)
3781 bpf_map_put_with_uref(map);
3782
3783 return fd;
3784}
3785
3786static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
3787 unsigned long addr, u32 *off,
3788 u32 *type)
3789{
3790 const struct bpf_map *map;
3791 int i;
3792
3793 mutex_lock(&prog->aux->used_maps_mutex);
3794 for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {
3795 map = prog->aux->used_maps[i];
3796 if (map == (void *)addr) {
3797 *type = BPF_PSEUDO_MAP_FD;
3798 goto out;
3799 }
3800 if (!map->ops->map_direct_value_meta)
3801 continue;
3802 if (!map->ops->map_direct_value_meta(map, addr, off)) {
3803 *type = BPF_PSEUDO_MAP_VALUE;
3804 goto out;
3805 }
3806 }
3807 map = NULL;
3808
3809out:
3810 mutex_unlock(&prog->aux->used_maps_mutex);
3811 return map;
3812}
3813
3814static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog,
3815 const struct cred *f_cred)
3816{
3817 const struct bpf_map *map;
3818 struct bpf_insn *insns;
3819 u32 off, type;
3820 u64 imm;
3821 u8 code;
3822 int i;
3823
3824 insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog),
3825 GFP_USER);
3826 if (!insns)
3827 return insns;
3828
3829 for (i = 0; i < prog->len; i++) {
3830 code = insns[i].code;
3831
3832 if (code == (BPF_JMP | BPF_TAIL_CALL)) {
3833 insns[i].code = BPF_JMP | BPF_CALL;
3834 insns[i].imm = BPF_FUNC_tail_call;
3835 /* fall-through */
3836 }
3837 if (code == (BPF_JMP | BPF_CALL) ||
3838 code == (BPF_JMP | BPF_CALL_ARGS)) {
3839 if (code == (BPF_JMP | BPF_CALL_ARGS))
3840 insns[i].code = BPF_JMP | BPF_CALL;
3841 if (!bpf_dump_raw_ok(f_cred))
3842 insns[i].imm = 0;
3843 continue;
3844 }
3845 if (BPF_CLASS(code) == BPF_LDX && BPF_MODE(code) == BPF_PROBE_MEM) {
3846 insns[i].code = BPF_LDX | BPF_SIZE(code) | BPF_MEM;
3847 continue;
3848 }
3849
3850 if (code != (BPF_LD | BPF_IMM | BPF_DW))
3851 continue;
3852
3853 imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm;
3854 map = bpf_map_from_imm(prog, imm, &off, &type);
3855 if (map) {
3856 insns[i].src_reg = type;
3857 insns[i].imm = map->id;
3858 insns[i + 1].imm = off;
3859 continue;
3860 }
3861 }
3862
3863 return insns;
3864}
3865
3866static int set_info_rec_size(struct bpf_prog_info *info)
3867{
3868 /*
3869 * Ensure info.*_rec_size is the same as kernel expected size
3870 *
3871 * or
3872 *
3873 * Only allow zero *_rec_size if both _rec_size and _cnt are
3874 * zero. In this case, the kernel will set the expected
3875 * _rec_size back to the info.
3876 */
3877
3878 if ((info->nr_func_info || info->func_info_rec_size) &&
3879 info->func_info_rec_size != sizeof(struct bpf_func_info))
3880 return -EINVAL;
3881
3882 if ((info->nr_line_info || info->line_info_rec_size) &&
3883 info->line_info_rec_size != sizeof(struct bpf_line_info))
3884 return -EINVAL;
3885
3886 if ((info->nr_jited_line_info || info->jited_line_info_rec_size) &&
3887 info->jited_line_info_rec_size != sizeof(__u64))
3888 return -EINVAL;
3889
3890 info->func_info_rec_size = sizeof(struct bpf_func_info);
3891 info->line_info_rec_size = sizeof(struct bpf_line_info);
3892 info->jited_line_info_rec_size = sizeof(__u64);
3893
3894 return 0;
3895}
3896
3897static int bpf_prog_get_info_by_fd(struct file *file,
3898 struct bpf_prog *prog,
3899 const union bpf_attr *attr,
3900 union bpf_attr __user *uattr)
3901{
3902 struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
3903 struct btf *attach_btf = bpf_prog_get_target_btf(prog);
3904 struct bpf_prog_info info;
3905 u32 info_len = attr->info.info_len;
3906 struct bpf_prog_kstats stats;
3907 char __user *uinsns;
3908 u32 ulen;
3909 int err;
3910
3911 err = bpf_check_uarg_tail_zero(USER_BPFPTR(uinfo), sizeof(info), info_len);
3912 if (err)
3913 return err;
3914 info_len = min_t(u32, sizeof(info), info_len);
3915
3916 memset(&info, 0, sizeof(info));
3917 if (copy_from_user(&info, uinfo, info_len))
3918 return -EFAULT;
3919
3920 info.type = prog->type;
3921 info.id = prog->aux->id;
3922 info.load_time = prog->aux->load_time;
3923 info.created_by_uid = from_kuid_munged(current_user_ns(),
3924 prog->aux->user->uid);
3925 info.gpl_compatible = prog->gpl_compatible;
3926
3927 memcpy(info.tag, prog->tag, sizeof(prog->tag));
3928 memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
3929
3930 mutex_lock(&prog->aux->used_maps_mutex);
3931 ulen = info.nr_map_ids;
3932 info.nr_map_ids = prog->aux->used_map_cnt;
3933 ulen = min_t(u32, info.nr_map_ids, ulen);
3934 if (ulen) {
3935 u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
3936 u32 i;
3937
3938 for (i = 0; i < ulen; i++)
3939 if (put_user(prog->aux->used_maps[i]->id,
3940 &user_map_ids[i])) {
3941 mutex_unlock(&prog->aux->used_maps_mutex);
3942 return -EFAULT;
3943 }
3944 }
3945 mutex_unlock(&prog->aux->used_maps_mutex);
3946
3947 err = set_info_rec_size(&info);
3948 if (err)
3949 return err;
3950
3951 bpf_prog_get_stats(prog, &stats);
3952 info.run_time_ns = stats.nsecs;
3953 info.run_cnt = stats.cnt;
3954 info.recursion_misses = stats.misses;
3955
3956 info.verified_insns = prog->aux->verified_insns;
3957
3958 if (!bpf_capable()) {
3959 info.jited_prog_len = 0;
3960 info.xlated_prog_len = 0;
3961 info.nr_jited_ksyms = 0;
3962 info.nr_jited_func_lens = 0;
3963 info.nr_func_info = 0;
3964 info.nr_line_info = 0;
3965 info.nr_jited_line_info = 0;
3966 goto done;
3967 }
3968
3969 ulen = info.xlated_prog_len;
3970 info.xlated_prog_len = bpf_prog_insn_size(prog);
3971 if (info.xlated_prog_len && ulen) {
3972 struct bpf_insn *insns_sanitized;
3973 bool fault;
3974
3975 if (prog->blinded && !bpf_dump_raw_ok(file->f_cred)) {
3976 info.xlated_prog_insns = 0;
3977 goto done;
3978 }
3979 insns_sanitized = bpf_insn_prepare_dump(prog, file->f_cred);
3980 if (!insns_sanitized)
3981 return -ENOMEM;
3982 uinsns = u64_to_user_ptr(info.xlated_prog_insns);
3983 ulen = min_t(u32, info.xlated_prog_len, ulen);
3984 fault = copy_to_user(uinsns, insns_sanitized, ulen);
3985 kfree(insns_sanitized);
3986 if (fault)
3987 return -EFAULT;
3988 }
3989
3990 if (bpf_prog_is_dev_bound(prog->aux)) {
3991 err = bpf_prog_offload_info_fill(&info, prog);
3992 if (err)
3993 return err;
3994 goto done;
3995 }
3996
3997 /* NOTE: the following code is supposed to be skipped for offload.
3998 * bpf_prog_offload_info_fill() is the place to fill similar fields
3999 * for offload.
4000 */
4001 ulen = info.jited_prog_len;
4002 if (prog->aux->func_cnt) {
4003 u32 i;
4004
4005 info.jited_prog_len = 0;
4006 for (i = 0; i < prog->aux->func_cnt; i++)
4007 info.jited_prog_len += prog->aux->func[i]->jited_len;
4008 } else {
4009 info.jited_prog_len = prog->jited_len;
4010 }
4011
4012 if (info.jited_prog_len && ulen) {
4013 if (bpf_dump_raw_ok(file->f_cred)) {
4014 uinsns = u64_to_user_ptr(info.jited_prog_insns);
4015 ulen = min_t(u32, info.jited_prog_len, ulen);
4016
4017 /* for multi-function programs, copy the JITed
4018 * instructions for all the functions
4019 */
4020 if (prog->aux->func_cnt) {
4021 u32 len, free, i;
4022 u8 *img;
4023
4024 free = ulen;
4025 for (i = 0; i < prog->aux->func_cnt; i++) {
4026 len = prog->aux->func[i]->jited_len;
4027 len = min_t(u32, len, free);
4028 img = (u8 *) prog->aux->func[i]->bpf_func;
4029 if (copy_to_user(uinsns, img, len))
4030 return -EFAULT;
4031 uinsns += len;
4032 free -= len;
4033 if (!free)
4034 break;
4035 }
4036 } else {
4037 if (copy_to_user(uinsns, prog->bpf_func, ulen))
4038 return -EFAULT;
4039 }
4040 } else {
4041 info.jited_prog_insns = 0;
4042 }
4043 }
4044
4045 ulen = info.nr_jited_ksyms;
4046 info.nr_jited_ksyms = prog->aux->func_cnt ? : 1;
4047 if (ulen) {
4048 if (bpf_dump_raw_ok(file->f_cred)) {
4049 unsigned long ksym_addr;
4050 u64 __user *user_ksyms;
4051 u32 i;
4052
4053 /* copy the address of the kernel symbol
4054 * corresponding to each function
4055 */
4056 ulen = min_t(u32, info.nr_jited_ksyms, ulen);
4057 user_ksyms = u64_to_user_ptr(info.jited_ksyms);
4058 if (prog->aux->func_cnt) {
4059 for (i = 0; i < ulen; i++) {
4060 ksym_addr = (unsigned long)
4061 prog->aux->func[i]->bpf_func;
4062 if (put_user((u64) ksym_addr,
4063 &user_ksyms[i]))
4064 return -EFAULT;
4065 }
4066 } else {
4067 ksym_addr = (unsigned long) prog->bpf_func;
4068 if (put_user((u64) ksym_addr, &user_ksyms[0]))
4069 return -EFAULT;
4070 }
4071 } else {
4072 info.jited_ksyms = 0;
4073 }
4074 }
4075
4076 ulen = info.nr_jited_func_lens;
4077 info.nr_jited_func_lens = prog->aux->func_cnt ? : 1;
4078 if (ulen) {
4079 if (bpf_dump_raw_ok(file->f_cred)) {
4080 u32 __user *user_lens;
4081 u32 func_len, i;
4082
4083 /* copy the JITed image lengths for each function */
4084 ulen = min_t(u32, info.nr_jited_func_lens, ulen);
4085 user_lens = u64_to_user_ptr(info.jited_func_lens);
4086 if (prog->aux->func_cnt) {
4087 for (i = 0; i < ulen; i++) {
4088 func_len =
4089 prog->aux->func[i]->jited_len;
4090 if (put_user(func_len, &user_lens[i]))
4091 return -EFAULT;
4092 }
4093 } else {
4094 func_len = prog->jited_len;
4095 if (put_user(func_len, &user_lens[0]))
4096 return -EFAULT;
4097 }
4098 } else {
4099 info.jited_func_lens = 0;
4100 }
4101 }
4102
4103 if (prog->aux->btf)
4104 info.btf_id = btf_obj_id(prog->aux->btf);
4105 info.attach_btf_id = prog->aux->attach_btf_id;
4106 if (attach_btf)
4107 info.attach_btf_obj_id = btf_obj_id(attach_btf);
4108
4109 ulen = info.nr_func_info;
4110 info.nr_func_info = prog->aux->func_info_cnt;
4111 if (info.nr_func_info && ulen) {
4112 char __user *user_finfo;
4113
4114 user_finfo = u64_to_user_ptr(info.func_info);
4115 ulen = min_t(u32, info.nr_func_info, ulen);
4116 if (copy_to_user(user_finfo, prog->aux->func_info,
4117 info.func_info_rec_size * ulen))
4118 return -EFAULT;
4119 }
4120
4121 ulen = info.nr_line_info;
4122 info.nr_line_info = prog->aux->nr_linfo;
4123 if (info.nr_line_info && ulen) {
4124 __u8 __user *user_linfo;
4125
4126 user_linfo = u64_to_user_ptr(info.line_info);
4127 ulen = min_t(u32, info.nr_line_info, ulen);
4128 if (copy_to_user(user_linfo, prog->aux->linfo,
4129 info.line_info_rec_size * ulen))
4130 return -EFAULT;
4131 }
4132
4133 ulen = info.nr_jited_line_info;
4134 if (prog->aux->jited_linfo)
4135 info.nr_jited_line_info = prog->aux->nr_linfo;
4136 else
4137 info.nr_jited_line_info = 0;
4138 if (info.nr_jited_line_info && ulen) {
4139 if (bpf_dump_raw_ok(file->f_cred)) {
4140 unsigned long line_addr;
4141 __u64 __user *user_linfo;
4142 u32 i;
4143
4144 user_linfo = u64_to_user_ptr(info.jited_line_info);
4145 ulen = min_t(u32, info.nr_jited_line_info, ulen);
4146 for (i = 0; i < ulen; i++) {
4147 line_addr = (unsigned long)prog->aux->jited_linfo[i];
4148 if (put_user((__u64)line_addr, &user_linfo[i]))
4149 return -EFAULT;
4150 }
4151 } else {
4152 info.jited_line_info = 0;
4153 }
4154 }
4155
4156 ulen = info.nr_prog_tags;
4157 info.nr_prog_tags = prog->aux->func_cnt ? : 1;
4158 if (ulen) {
4159 __u8 __user (*user_prog_tags)[BPF_TAG_SIZE];
4160 u32 i;
4161
4162 user_prog_tags = u64_to_user_ptr(info.prog_tags);
4163 ulen = min_t(u32, info.nr_prog_tags, ulen);
4164 if (prog->aux->func_cnt) {
4165 for (i = 0; i < ulen; i++) {
4166 if (copy_to_user(user_prog_tags[i],
4167 prog->aux->func[i]->tag,
4168 BPF_TAG_SIZE))
4169 return -EFAULT;
4170 }
4171 } else {
4172 if (copy_to_user(user_prog_tags[0],
4173 prog->tag, BPF_TAG_SIZE))
4174 return -EFAULT;
4175 }
4176 }
4177
4178done:
4179 if (copy_to_user(uinfo, &info, info_len) ||
4180 put_user(info_len, &uattr->info.info_len))
4181 return -EFAULT;
4182
4183 return 0;
4184}
4185
4186static int bpf_map_get_info_by_fd(struct file *file,
4187 struct bpf_map *map,
4188 const union bpf_attr *attr,
4189 union bpf_attr __user *uattr)
4190{
4191 struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
4192 struct bpf_map_info info;
4193 u32 info_len = attr->info.info_len;
4194 int err;
4195
4196 err = bpf_check_uarg_tail_zero(USER_BPFPTR(uinfo), sizeof(info), info_len);
4197 if (err)
4198 return err;
4199 info_len = min_t(u32, sizeof(info), info_len);
4200
4201 memset(&info, 0, sizeof(info));
4202 info.type = map->map_type;
4203 info.id = map->id;
4204 info.key_size = map->key_size;
4205 info.value_size = map->value_size;
4206 info.max_entries = map->max_entries;
4207 info.map_flags = map->map_flags;
4208 info.map_extra = map->map_extra;
4209 memcpy(info.name, map->name, sizeof(map->name));
4210
4211 if (map->btf) {
4212 info.btf_id = btf_obj_id(map->btf);
4213 info.btf_key_type_id = map->btf_key_type_id;
4214 info.btf_value_type_id = map->btf_value_type_id;
4215 }
4216 info.btf_vmlinux_value_type_id = map->btf_vmlinux_value_type_id;
4217
4218 if (bpf_map_is_dev_bound(map)) {
4219 err = bpf_map_offload_info_fill(&info, map);
4220 if (err)
4221 return err;
4222 }
4223
4224 if (copy_to_user(uinfo, &info, info_len) ||
4225 put_user(info_len, &uattr->info.info_len))
4226 return -EFAULT;
4227
4228 return 0;
4229}
4230
4231static int bpf_btf_get_info_by_fd(struct file *file,
4232 struct btf *btf,
4233 const union bpf_attr *attr,
4234 union bpf_attr __user *uattr)
4235{
4236 struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info);
4237 u32 info_len = attr->info.info_len;
4238 int err;
4239
4240 err = bpf_check_uarg_tail_zero(USER_BPFPTR(uinfo), sizeof(*uinfo), info_len);
4241 if (err)
4242 return err;
4243
4244 return btf_get_info_by_fd(btf, attr, uattr);
4245}
4246
4247static int bpf_link_get_info_by_fd(struct file *file,
4248 struct bpf_link *link,
4249 const union bpf_attr *attr,
4250 union bpf_attr __user *uattr)
4251{
4252 struct bpf_link_info __user *uinfo = u64_to_user_ptr(attr->info.info);
4253 struct bpf_link_info info;
4254 u32 info_len = attr->info.info_len;
4255 int err;
4256
4257 err = bpf_check_uarg_tail_zero(USER_BPFPTR(uinfo), sizeof(info), info_len);
4258 if (err)
4259 return err;
4260 info_len = min_t(u32, sizeof(info), info_len);
4261
4262 memset(&info, 0, sizeof(info));
4263 if (copy_from_user(&info, uinfo, info_len))
4264 return -EFAULT;
4265
4266 info.type = link->type;
4267 info.id = link->id;
4268 info.prog_id = link->prog->aux->id;
4269
4270 if (link->ops->fill_link_info) {
4271 err = link->ops->fill_link_info(link, &info);
4272 if (err)
4273 return err;
4274 }
4275
4276 if (copy_to_user(uinfo, &info, info_len) ||
4277 put_user(info_len, &uattr->info.info_len))
4278 return -EFAULT;
4279
4280 return 0;
4281}
4282
4283
4284#define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
4285
4286static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
4287 union bpf_attr __user *uattr)
4288{
4289 int ufd = attr->info.bpf_fd;
4290 struct fd f;
4291 int err;
4292
4293 if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
4294 return -EINVAL;
4295
4296 f = fdget(ufd);
4297 if (!f.file)
4298 return -EBADFD;
4299
4300 if (f.file->f_op == &bpf_prog_fops)
4301 err = bpf_prog_get_info_by_fd(f.file, f.file->private_data, attr,
4302 uattr);
4303 else if (f.file->f_op == &bpf_map_fops)
4304 err = bpf_map_get_info_by_fd(f.file, f.file->private_data, attr,
4305 uattr);
4306 else if (f.file->f_op == &btf_fops)
4307 err = bpf_btf_get_info_by_fd(f.file, f.file->private_data, attr, uattr);
4308 else if (f.file->f_op == &bpf_link_fops)
4309 err = bpf_link_get_info_by_fd(f.file, f.file->private_data,
4310 attr, uattr);
4311 else
4312 err = -EINVAL;
4313
4314 fdput(f);
4315 return err;
4316}
4317
4318#define BPF_BTF_LOAD_LAST_FIELD btf_log_level
4319
4320static int bpf_btf_load(const union bpf_attr *attr, bpfptr_t uattr)
4321{
4322 if (CHECK_ATTR(BPF_BTF_LOAD))
4323 return -EINVAL;
4324
4325 if (!bpf_capable())
4326 return -EPERM;
4327
4328 return btf_new_fd(attr, uattr);
4329}
4330
4331#define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
4332
4333static int bpf_btf_get_fd_by_id(const union bpf_attr *attr)
4334{
4335 if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID))
4336 return -EINVAL;
4337
4338 if (!capable(CAP_SYS_ADMIN))
4339 return -EPERM;
4340
4341 return btf_get_fd_by_id(attr->btf_id);
4342}
4343
4344static int bpf_task_fd_query_copy(const union bpf_attr *attr,
4345 union bpf_attr __user *uattr,
4346 u32 prog_id, u32 fd_type,
4347 const char *buf, u64 probe_offset,
4348 u64 probe_addr)
4349{
4350 char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf);
4351 u32 len = buf ? strlen(buf) : 0, input_len;
4352 int err = 0;
4353
4354 if (put_user(len, &uattr->task_fd_query.buf_len))
4355 return -EFAULT;
4356 input_len = attr->task_fd_query.buf_len;
4357 if (input_len && ubuf) {
4358 if (!len) {
4359 /* nothing to copy, just make ubuf NULL terminated */
4360 char zero = '\0';
4361
4362 if (put_user(zero, ubuf))
4363 return -EFAULT;
4364 } else if (input_len >= len + 1) {
4365 /* ubuf can hold the string with NULL terminator */
4366 if (copy_to_user(ubuf, buf, len + 1))
4367 return -EFAULT;
4368 } else {
4369 /* ubuf cannot hold the string with NULL terminator,
4370 * do a partial copy with NULL terminator.
4371 */
4372 char zero = '\0';
4373
4374 err = -ENOSPC;
4375 if (copy_to_user(ubuf, buf, input_len - 1))
4376 return -EFAULT;
4377 if (put_user(zero, ubuf + input_len - 1))
4378 return -EFAULT;
4379 }
4380 }
4381
4382 if (put_user(prog_id, &uattr->task_fd_query.prog_id) ||
4383 put_user(fd_type, &uattr->task_fd_query.fd_type) ||
4384 put_user(probe_offset, &uattr->task_fd_query.probe_offset) ||
4385 put_user(probe_addr, &uattr->task_fd_query.probe_addr))
4386 return -EFAULT;
4387
4388 return err;
4389}
4390
4391#define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr
4392
4393static int bpf_task_fd_query(const union bpf_attr *attr,
4394 union bpf_attr __user *uattr)
4395{
4396 pid_t pid = attr->task_fd_query.pid;
4397 u32 fd = attr->task_fd_query.fd;
4398 const struct perf_event *event;
4399 struct task_struct *task;
4400 struct file *file;
4401 int err;
4402
4403 if (CHECK_ATTR(BPF_TASK_FD_QUERY))
4404 return -EINVAL;
4405
4406 if (!capable(CAP_SYS_ADMIN))
4407 return -EPERM;
4408
4409 if (attr->task_fd_query.flags != 0)
4410 return -EINVAL;
4411
4412 rcu_read_lock();
4413 task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
4414 rcu_read_unlock();
4415 if (!task)
4416 return -ENOENT;
4417
4418 err = 0;
4419 file = fget_task(task, fd);
4420 put_task_struct(task);
4421 if (!file)
4422 return -EBADF;
4423
4424 if (file->f_op == &bpf_link_fops) {
4425 struct bpf_link *link = file->private_data;
4426
4427 if (link->ops == &bpf_raw_tp_link_lops) {
4428 struct bpf_raw_tp_link *raw_tp =
4429 container_of(link, struct bpf_raw_tp_link, link);
4430 struct bpf_raw_event_map *btp = raw_tp->btp;
4431
4432 err = bpf_task_fd_query_copy(attr, uattr,
4433 raw_tp->link.prog->aux->id,
4434 BPF_FD_TYPE_RAW_TRACEPOINT,
4435 btp->tp->name, 0, 0);
4436 goto put_file;
4437 }
4438 goto out_not_supp;
4439 }
4440
4441 event = perf_get_event(file);
4442 if (!IS_ERR(event)) {
4443 u64 probe_offset, probe_addr;
4444 u32 prog_id, fd_type;
4445 const char *buf;
4446
4447 err = bpf_get_perf_event_info(event, &prog_id, &fd_type,
4448 &buf, &probe_offset,
4449 &probe_addr);
4450 if (!err)
4451 err = bpf_task_fd_query_copy(attr, uattr, prog_id,
4452 fd_type, buf,
4453 probe_offset,
4454 probe_addr);
4455 goto put_file;
4456 }
4457
4458out_not_supp:
4459 err = -ENOTSUPP;
4460put_file:
4461 fput(file);
4462 return err;
4463}
4464
4465#define BPF_MAP_BATCH_LAST_FIELD batch.flags
4466
4467#define BPF_DO_BATCH(fn, ...) \
4468 do { \
4469 if (!fn) { \
4470 err = -ENOTSUPP; \
4471 goto err_put; \
4472 } \
4473 err = fn(__VA_ARGS__); \
4474 } while (0)
4475
4476static int bpf_map_do_batch(const union bpf_attr *attr,
4477 union bpf_attr __user *uattr,
4478 int cmd)
4479{
4480 bool has_read = cmd == BPF_MAP_LOOKUP_BATCH ||
4481 cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH;
4482 bool has_write = cmd != BPF_MAP_LOOKUP_BATCH;
4483 struct bpf_map *map;
4484 int err, ufd;
4485 struct fd f;
4486
4487 if (CHECK_ATTR(BPF_MAP_BATCH))
4488 return -EINVAL;
4489
4490 ufd = attr->batch.map_fd;
4491 f = fdget(ufd);
4492 map = __bpf_map_get(f);
4493 if (IS_ERR(map))
4494 return PTR_ERR(map);
4495 if (has_write)
4496 bpf_map_write_active_inc(map);
4497 if (has_read && !(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
4498 err = -EPERM;
4499 goto err_put;
4500 }
4501 if (has_write && !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
4502 err = -EPERM;
4503 goto err_put;
4504 }
4505
4506 if (cmd == BPF_MAP_LOOKUP_BATCH)
4507 BPF_DO_BATCH(map->ops->map_lookup_batch, map, attr, uattr);
4508 else if (cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH)
4509 BPF_DO_BATCH(map->ops->map_lookup_and_delete_batch, map, attr, uattr);
4510 else if (cmd == BPF_MAP_UPDATE_BATCH)
4511 BPF_DO_BATCH(map->ops->map_update_batch, map, f.file, attr, uattr);
4512 else
4513 BPF_DO_BATCH(map->ops->map_delete_batch, map, attr, uattr);
4514err_put:
4515 if (has_write)
4516 bpf_map_write_active_dec(map);
4517 fdput(f);
4518 return err;
4519}
4520
4521#define BPF_LINK_CREATE_LAST_FIELD link_create.kprobe_multi.cookies
4522static int link_create(union bpf_attr *attr, bpfptr_t uattr)
4523{
4524 enum bpf_prog_type ptype;
4525 struct bpf_prog *prog;
4526 int ret;
4527
4528 if (CHECK_ATTR(BPF_LINK_CREATE))
4529 return -EINVAL;
4530
4531 prog = bpf_prog_get(attr->link_create.prog_fd);
4532 if (IS_ERR(prog))
4533 return PTR_ERR(prog);
4534
4535 ret = bpf_prog_attach_check_attach_type(prog,
4536 attr->link_create.attach_type);
4537 if (ret)
4538 goto out;
4539
4540 switch (prog->type) {
4541 case BPF_PROG_TYPE_EXT:
4542 break;
4543 case BPF_PROG_TYPE_PERF_EVENT:
4544 case BPF_PROG_TYPE_TRACEPOINT:
4545 if (attr->link_create.attach_type != BPF_PERF_EVENT) {
4546 ret = -EINVAL;
4547 goto out;
4548 }
4549 break;
4550 case BPF_PROG_TYPE_KPROBE:
4551 if (attr->link_create.attach_type != BPF_PERF_EVENT &&
4552 attr->link_create.attach_type != BPF_TRACE_KPROBE_MULTI) {
4553 ret = -EINVAL;
4554 goto out;
4555 }
4556 break;
4557 default:
4558 ptype = attach_type_to_prog_type(attr->link_create.attach_type);
4559 if (ptype == BPF_PROG_TYPE_UNSPEC || ptype != prog->type) {
4560 ret = -EINVAL;
4561 goto out;
4562 }
4563 break;
4564 }
4565
4566 switch (prog->type) {
4567 case BPF_PROG_TYPE_CGROUP_SKB:
4568 case BPF_PROG_TYPE_CGROUP_SOCK:
4569 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
4570 case BPF_PROG_TYPE_SOCK_OPS:
4571 case BPF_PROG_TYPE_CGROUP_DEVICE:
4572 case BPF_PROG_TYPE_CGROUP_SYSCTL:
4573 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
4574 ret = cgroup_bpf_link_attach(attr, prog);
4575 break;
4576 case BPF_PROG_TYPE_EXT:
4577 ret = bpf_tracing_prog_attach(prog,
4578 attr->link_create.target_fd,
4579 attr->link_create.target_btf_id,
4580 attr->link_create.tracing.cookie);
4581 break;
4582 case BPF_PROG_TYPE_LSM:
4583 case BPF_PROG_TYPE_TRACING:
4584 if (attr->link_create.attach_type != prog->expected_attach_type) {
4585 ret = -EINVAL;
4586 goto out;
4587 }
4588 if (prog->expected_attach_type == BPF_TRACE_RAW_TP)
4589 ret = bpf_raw_tp_link_attach(prog, NULL);
4590 else if (prog->expected_attach_type == BPF_TRACE_ITER)
4591 ret = bpf_iter_link_attach(attr, uattr, prog);
4592 else if (prog->expected_attach_type == BPF_LSM_CGROUP)
4593 ret = cgroup_bpf_link_attach(attr, prog);
4594 else
4595 ret = bpf_tracing_prog_attach(prog,
4596 attr->link_create.target_fd,
4597 attr->link_create.target_btf_id,
4598 attr->link_create.tracing.cookie);
4599 break;
4600 case BPF_PROG_TYPE_FLOW_DISSECTOR:
4601 case BPF_PROG_TYPE_SK_LOOKUP:
4602 ret = netns_bpf_link_create(attr, prog);
4603 break;
4604#ifdef CONFIG_NET
4605 case BPF_PROG_TYPE_XDP:
4606 ret = bpf_xdp_link_attach(attr, prog);
4607 break;
4608#endif
4609 case BPF_PROG_TYPE_PERF_EVENT:
4610 case BPF_PROG_TYPE_TRACEPOINT:
4611 ret = bpf_perf_link_attach(attr, prog);
4612 break;
4613 case BPF_PROG_TYPE_KPROBE:
4614 if (attr->link_create.attach_type == BPF_PERF_EVENT)
4615 ret = bpf_perf_link_attach(attr, prog);
4616 else
4617 ret = bpf_kprobe_multi_link_attach(attr, prog);
4618 break;
4619 default:
4620 ret = -EINVAL;
4621 }
4622
4623out:
4624 if (ret < 0)
4625 bpf_prog_put(prog);
4626 return ret;
4627}
4628
4629#define BPF_LINK_UPDATE_LAST_FIELD link_update.old_prog_fd
4630
4631static int link_update(union bpf_attr *attr)
4632{
4633 struct bpf_prog *old_prog = NULL, *new_prog;
4634 struct bpf_link *link;
4635 u32 flags;
4636 int ret;
4637
4638 if (CHECK_ATTR(BPF_LINK_UPDATE))
4639 return -EINVAL;
4640
4641 flags = attr->link_update.flags;
4642 if (flags & ~BPF_F_REPLACE)
4643 return -EINVAL;
4644
4645 link = bpf_link_get_from_fd(attr->link_update.link_fd);
4646 if (IS_ERR(link))
4647 return PTR_ERR(link);
4648
4649 new_prog = bpf_prog_get(attr->link_update.new_prog_fd);
4650 if (IS_ERR(new_prog)) {
4651 ret = PTR_ERR(new_prog);
4652 goto out_put_link;
4653 }
4654
4655 if (flags & BPF_F_REPLACE) {
4656 old_prog = bpf_prog_get(attr->link_update.old_prog_fd);
4657 if (IS_ERR(old_prog)) {
4658 ret = PTR_ERR(old_prog);
4659 old_prog = NULL;
4660 goto out_put_progs;
4661 }
4662 } else if (attr->link_update.old_prog_fd) {
4663 ret = -EINVAL;
4664 goto out_put_progs;
4665 }
4666
4667 if (link->ops->update_prog)
4668 ret = link->ops->update_prog(link, new_prog, old_prog);
4669 else
4670 ret = -EINVAL;
4671
4672out_put_progs:
4673 if (old_prog)
4674 bpf_prog_put(old_prog);
4675 if (ret)
4676 bpf_prog_put(new_prog);
4677out_put_link:
4678 bpf_link_put(link);
4679 return ret;
4680}
4681
4682#define BPF_LINK_DETACH_LAST_FIELD link_detach.link_fd
4683
4684static int link_detach(union bpf_attr *attr)
4685{
4686 struct bpf_link *link;
4687 int ret;
4688
4689 if (CHECK_ATTR(BPF_LINK_DETACH))
4690 return -EINVAL;
4691
4692 link = bpf_link_get_from_fd(attr->link_detach.link_fd);
4693 if (IS_ERR(link))
4694 return PTR_ERR(link);
4695
4696 if (link->ops->detach)
4697 ret = link->ops->detach(link);
4698 else
4699 ret = -EOPNOTSUPP;
4700
4701 bpf_link_put(link);
4702 return ret;
4703}
4704
4705static struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
4706{
4707 return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? link : ERR_PTR(-ENOENT);
4708}
4709
4710struct bpf_link *bpf_link_by_id(u32 id)
4711{
4712 struct bpf_link *link;
4713
4714 if (!id)
4715 return ERR_PTR(-ENOENT);
4716
4717 spin_lock_bh(&link_idr_lock);
4718 /* before link is "settled", ID is 0, pretend it doesn't exist yet */
4719 link = idr_find(&link_idr, id);
4720 if (link) {
4721 if (link->id)
4722 link = bpf_link_inc_not_zero(link);
4723 else
4724 link = ERR_PTR(-EAGAIN);
4725 } else {
4726 link = ERR_PTR(-ENOENT);
4727 }
4728 spin_unlock_bh(&link_idr_lock);
4729 return link;
4730}
4731
4732struct bpf_link *bpf_link_get_curr_or_next(u32 *id)
4733{
4734 struct bpf_link *link;
4735
4736 spin_lock_bh(&link_idr_lock);
4737again:
4738 link = idr_get_next(&link_idr, id);
4739 if (link) {
4740 link = bpf_link_inc_not_zero(link);
4741 if (IS_ERR(link)) {
4742 (*id)++;
4743 goto again;
4744 }
4745 }
4746 spin_unlock_bh(&link_idr_lock);
4747
4748 return link;
4749}
4750
4751#define BPF_LINK_GET_FD_BY_ID_LAST_FIELD link_id
4752
4753static int bpf_link_get_fd_by_id(const union bpf_attr *attr)
4754{
4755 struct bpf_link *link;
4756 u32 id = attr->link_id;
4757 int fd;
4758
4759 if (CHECK_ATTR(BPF_LINK_GET_FD_BY_ID))
4760 return -EINVAL;
4761
4762 if (!capable(CAP_SYS_ADMIN))
4763 return -EPERM;
4764
4765 link = bpf_link_by_id(id);
4766 if (IS_ERR(link))
4767 return PTR_ERR(link);
4768
4769 fd = bpf_link_new_fd(link);
4770 if (fd < 0)
4771 bpf_link_put(link);
4772
4773 return fd;
4774}
4775
4776DEFINE_MUTEX(bpf_stats_enabled_mutex);
4777
4778static int bpf_stats_release(struct inode *inode, struct file *file)
4779{
4780 mutex_lock(&bpf_stats_enabled_mutex);
4781 static_key_slow_dec(&bpf_stats_enabled_key.key);
4782 mutex_unlock(&bpf_stats_enabled_mutex);
4783 return 0;
4784}
4785
4786static const struct file_operations bpf_stats_fops = {
4787 .release = bpf_stats_release,
4788};
4789
4790static int bpf_enable_runtime_stats(void)
4791{
4792 int fd;
4793
4794 mutex_lock(&bpf_stats_enabled_mutex);
4795
4796 /* Set a very high limit to avoid overflow */
4797 if (static_key_count(&bpf_stats_enabled_key.key) > INT_MAX / 2) {
4798 mutex_unlock(&bpf_stats_enabled_mutex);
4799 return -EBUSY;
4800 }
4801
4802 fd = anon_inode_getfd("bpf-stats", &bpf_stats_fops, NULL, O_CLOEXEC);
4803 if (fd >= 0)
4804 static_key_slow_inc(&bpf_stats_enabled_key.key);
4805
4806 mutex_unlock(&bpf_stats_enabled_mutex);
4807 return fd;
4808}
4809
4810#define BPF_ENABLE_STATS_LAST_FIELD enable_stats.type
4811
4812static int bpf_enable_stats(union bpf_attr *attr)
4813{
4814
4815 if (CHECK_ATTR(BPF_ENABLE_STATS))
4816 return -EINVAL;
4817
4818 if (!capable(CAP_SYS_ADMIN))
4819 return -EPERM;
4820
4821 switch (attr->enable_stats.type) {
4822 case BPF_STATS_RUN_TIME:
4823 return bpf_enable_runtime_stats();
4824 default:
4825 break;
4826 }
4827 return -EINVAL;
4828}
4829
4830#define BPF_ITER_CREATE_LAST_FIELD iter_create.flags
4831
4832static int bpf_iter_create(union bpf_attr *attr)
4833{
4834 struct bpf_link *link;
4835 int err;
4836
4837 if (CHECK_ATTR(BPF_ITER_CREATE))
4838 return -EINVAL;
4839
4840 if (attr->iter_create.flags)
4841 return -EINVAL;
4842
4843 link = bpf_link_get_from_fd(attr->iter_create.link_fd);
4844 if (IS_ERR(link))
4845 return PTR_ERR(link);
4846
4847 err = bpf_iter_new_fd(link);
4848 bpf_link_put(link);
4849
4850 return err;
4851}
4852
4853#define BPF_PROG_BIND_MAP_LAST_FIELD prog_bind_map.flags
4854
4855static int bpf_prog_bind_map(union bpf_attr *attr)
4856{
4857 struct bpf_prog *prog;
4858 struct bpf_map *map;
4859 struct bpf_map **used_maps_old, **used_maps_new;
4860 int i, ret = 0;
4861
4862 if (CHECK_ATTR(BPF_PROG_BIND_MAP))
4863 return -EINVAL;
4864
4865 if (attr->prog_bind_map.flags)
4866 return -EINVAL;
4867
4868 prog = bpf_prog_get(attr->prog_bind_map.prog_fd);
4869 if (IS_ERR(prog))
4870 return PTR_ERR(prog);
4871
4872 map = bpf_map_get(attr->prog_bind_map.map_fd);
4873 if (IS_ERR(map)) {
4874 ret = PTR_ERR(map);
4875 goto out_prog_put;
4876 }
4877
4878 mutex_lock(&prog->aux->used_maps_mutex);
4879
4880 used_maps_old = prog->aux->used_maps;
4881
4882 for (i = 0; i < prog->aux->used_map_cnt; i++)
4883 if (used_maps_old[i] == map) {
4884 bpf_map_put(map);
4885 goto out_unlock;
4886 }
4887
4888 used_maps_new = kmalloc_array(prog->aux->used_map_cnt + 1,
4889 sizeof(used_maps_new[0]),
4890 GFP_KERNEL);
4891 if (!used_maps_new) {
4892 ret = -ENOMEM;
4893 goto out_unlock;
4894 }
4895
4896 memcpy(used_maps_new, used_maps_old,
4897 sizeof(used_maps_old[0]) * prog->aux->used_map_cnt);
4898 used_maps_new[prog->aux->used_map_cnt] = map;
4899
4900 prog->aux->used_map_cnt++;
4901 prog->aux->used_maps = used_maps_new;
4902
4903 kfree(used_maps_old);
4904
4905out_unlock:
4906 mutex_unlock(&prog->aux->used_maps_mutex);
4907
4908 if (ret)
4909 bpf_map_put(map);
4910out_prog_put:
4911 bpf_prog_put(prog);
4912 return ret;
4913}
4914
4915static int __sys_bpf(int cmd, bpfptr_t uattr, unsigned int size)
4916{
4917 union bpf_attr attr;
4918 bool capable;
4919 int err;
4920
4921 capable = bpf_capable() || !sysctl_unprivileged_bpf_disabled;
4922
4923 /* Intent here is for unprivileged_bpf_disabled to block key object
4924 * creation commands for unprivileged users; other actions depend
4925 * of fd availability and access to bpffs, so are dependent on
4926 * object creation success. Capabilities are later verified for
4927 * operations such as load and map create, so even with unprivileged
4928 * BPF disabled, capability checks are still carried out for these
4929 * and other operations.
4930 */
4931 if (!capable &&
4932 (cmd == BPF_MAP_CREATE || cmd == BPF_PROG_LOAD))
4933 return -EPERM;
4934
4935 err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size);
4936 if (err)
4937 return err;
4938 size = min_t(u32, size, sizeof(attr));
4939
4940 /* copy attributes from user space, may be less than sizeof(bpf_attr) */
4941 memset(&attr, 0, sizeof(attr));
4942 if (copy_from_bpfptr(&attr, uattr, size) != 0)
4943 return -EFAULT;
4944
4945 err = security_bpf(cmd, &attr, size);
4946 if (err < 0)
4947 return err;
4948
4949 switch (cmd) {
4950 case BPF_MAP_CREATE:
4951 err = map_create(&attr);
4952 break;
4953 case BPF_MAP_LOOKUP_ELEM:
4954 err = map_lookup_elem(&attr);
4955 break;
4956 case BPF_MAP_UPDATE_ELEM:
4957 err = map_update_elem(&attr, uattr);
4958 break;
4959 case BPF_MAP_DELETE_ELEM:
4960 err = map_delete_elem(&attr, uattr);
4961 break;
4962 case BPF_MAP_GET_NEXT_KEY:
4963 err = map_get_next_key(&attr);
4964 break;
4965 case BPF_MAP_FREEZE:
4966 err = map_freeze(&attr);
4967 break;
4968 case BPF_PROG_LOAD:
4969 err = bpf_prog_load(&attr, uattr);
4970 break;
4971 case BPF_OBJ_PIN:
4972 err = bpf_obj_pin(&attr);
4973 break;
4974 case BPF_OBJ_GET:
4975 err = bpf_obj_get(&attr);
4976 break;
4977 case BPF_PROG_ATTACH:
4978 err = bpf_prog_attach(&attr);
4979 break;
4980 case BPF_PROG_DETACH:
4981 err = bpf_prog_detach(&attr);
4982 break;
4983 case BPF_PROG_QUERY:
4984 err = bpf_prog_query(&attr, uattr.user);
4985 break;
4986 case BPF_PROG_TEST_RUN:
4987 err = bpf_prog_test_run(&attr, uattr.user);
4988 break;
4989 case BPF_PROG_GET_NEXT_ID:
4990 err = bpf_obj_get_next_id(&attr, uattr.user,
4991 &prog_idr, &prog_idr_lock);
4992 break;
4993 case BPF_MAP_GET_NEXT_ID:
4994 err = bpf_obj_get_next_id(&attr, uattr.user,
4995 &map_idr, &map_idr_lock);
4996 break;
4997 case BPF_BTF_GET_NEXT_ID:
4998 err = bpf_obj_get_next_id(&attr, uattr.user,
4999 &btf_idr, &btf_idr_lock);
5000 break;
5001 case BPF_PROG_GET_FD_BY_ID:
5002 err = bpf_prog_get_fd_by_id(&attr);
5003 break;
5004 case BPF_MAP_GET_FD_BY_ID:
5005 err = bpf_map_get_fd_by_id(&attr);
5006 break;
5007 case BPF_OBJ_GET_INFO_BY_FD:
5008 err = bpf_obj_get_info_by_fd(&attr, uattr.user);
5009 break;
5010 case BPF_RAW_TRACEPOINT_OPEN:
5011 err = bpf_raw_tracepoint_open(&attr);
5012 break;
5013 case BPF_BTF_LOAD:
5014 err = bpf_btf_load(&attr, uattr);
5015 break;
5016 case BPF_BTF_GET_FD_BY_ID:
5017 err = bpf_btf_get_fd_by_id(&attr);
5018 break;
5019 case BPF_TASK_FD_QUERY:
5020 err = bpf_task_fd_query(&attr, uattr.user);
5021 break;
5022 case BPF_MAP_LOOKUP_AND_DELETE_ELEM:
5023 err = map_lookup_and_delete_elem(&attr);
5024 break;
5025 case BPF_MAP_LOOKUP_BATCH:
5026 err = bpf_map_do_batch(&attr, uattr.user, BPF_MAP_LOOKUP_BATCH);
5027 break;
5028 case BPF_MAP_LOOKUP_AND_DELETE_BATCH:
5029 err = bpf_map_do_batch(&attr, uattr.user,
5030 BPF_MAP_LOOKUP_AND_DELETE_BATCH);
5031 break;
5032 case BPF_MAP_UPDATE_BATCH:
5033 err = bpf_map_do_batch(&attr, uattr.user, BPF_MAP_UPDATE_BATCH);
5034 break;
5035 case BPF_MAP_DELETE_BATCH:
5036 err = bpf_map_do_batch(&attr, uattr.user, BPF_MAP_DELETE_BATCH);
5037 break;
5038 case BPF_LINK_CREATE:
5039 err = link_create(&attr, uattr);
5040 break;
5041 case BPF_LINK_UPDATE:
5042 err = link_update(&attr);
5043 break;
5044 case BPF_LINK_GET_FD_BY_ID:
5045 err = bpf_link_get_fd_by_id(&attr);
5046 break;
5047 case BPF_LINK_GET_NEXT_ID:
5048 err = bpf_obj_get_next_id(&attr, uattr.user,
5049 &link_idr, &link_idr_lock);
5050 break;
5051 case BPF_ENABLE_STATS:
5052 err = bpf_enable_stats(&attr);
5053 break;
5054 case BPF_ITER_CREATE:
5055 err = bpf_iter_create(&attr);
5056 break;
5057 case BPF_LINK_DETACH:
5058 err = link_detach(&attr);
5059 break;
5060 case BPF_PROG_BIND_MAP:
5061 err = bpf_prog_bind_map(&attr);
5062 break;
5063 default:
5064 err = -EINVAL;
5065 break;
5066 }
5067
5068 return err;
5069}
5070
5071SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
5072{
5073 return __sys_bpf(cmd, USER_BPFPTR(uattr), size);
5074}
5075
5076static bool syscall_prog_is_valid_access(int off, int size,
5077 enum bpf_access_type type,
5078 const struct bpf_prog *prog,
5079 struct bpf_insn_access_aux *info)
5080{
5081 if (off < 0 || off >= U16_MAX)
5082 return false;
5083 if (off % size != 0)
5084 return false;
5085 return true;
5086}
5087
5088BPF_CALL_3(bpf_sys_bpf, int, cmd, union bpf_attr *, attr, u32, attr_size)
5089{
5090 switch (cmd) {
5091 case BPF_MAP_CREATE:
5092 case BPF_MAP_DELETE_ELEM:
5093 case BPF_MAP_UPDATE_ELEM:
5094 case BPF_MAP_FREEZE:
5095 case BPF_MAP_GET_FD_BY_ID:
5096 case BPF_PROG_LOAD:
5097 case BPF_BTF_LOAD:
5098 case BPF_LINK_CREATE:
5099 case BPF_RAW_TRACEPOINT_OPEN:
5100 break;
5101 default:
5102 return -EINVAL;
5103 }
5104 return __sys_bpf(cmd, KERNEL_BPFPTR(attr), attr_size);
5105}
5106
5107
5108/* To shut up -Wmissing-prototypes.
5109 * This function is used by the kernel light skeleton
5110 * to load bpf programs when modules are loaded or during kernel boot.
5111 * See tools/lib/bpf/skel_internal.h
5112 */
5113int kern_sys_bpf(int cmd, union bpf_attr *attr, unsigned int size);
5114
5115int kern_sys_bpf(int cmd, union bpf_attr *attr, unsigned int size)
5116{
5117 struct bpf_prog * __maybe_unused prog;
5118 struct bpf_tramp_run_ctx __maybe_unused run_ctx;
5119
5120 switch (cmd) {
5121#ifdef CONFIG_BPF_JIT /* __bpf_prog_enter_sleepable used by trampoline and JIT */
5122 case BPF_PROG_TEST_RUN:
5123 if (attr->test.data_in || attr->test.data_out ||
5124 attr->test.ctx_out || attr->test.duration ||
5125 attr->test.repeat || attr->test.flags)
5126 return -EINVAL;
5127
5128 prog = bpf_prog_get_type(attr->test.prog_fd, BPF_PROG_TYPE_SYSCALL);
5129 if (IS_ERR(prog))
5130 return PTR_ERR(prog);
5131
5132 if (attr->test.ctx_size_in < prog->aux->max_ctx_offset ||
5133 attr->test.ctx_size_in > U16_MAX) {
5134 bpf_prog_put(prog);
5135 return -EINVAL;
5136 }
5137
5138 run_ctx.bpf_cookie = 0;
5139 run_ctx.saved_run_ctx = NULL;
5140 if (!__bpf_prog_enter_sleepable_recur(prog, &run_ctx)) {
5141 /* recursion detected */
5142 bpf_prog_put(prog);
5143 return -EBUSY;
5144 }
5145 attr->test.retval = bpf_prog_run(prog, (void *) (long) attr->test.ctx_in);
5146 __bpf_prog_exit_sleepable_recur(prog, 0 /* bpf_prog_run does runtime stats */,
5147 &run_ctx);
5148 bpf_prog_put(prog);
5149 return 0;
5150#endif
5151 default:
5152 return ____bpf_sys_bpf(cmd, attr, size);
5153 }
5154}
5155EXPORT_SYMBOL(kern_sys_bpf);
5156
5157static const struct bpf_func_proto bpf_sys_bpf_proto = {
5158 .func = bpf_sys_bpf,
5159 .gpl_only = false,
5160 .ret_type = RET_INTEGER,
5161 .arg1_type = ARG_ANYTHING,
5162 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
5163 .arg3_type = ARG_CONST_SIZE,
5164};
5165
5166const struct bpf_func_proto * __weak
5167tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5168{
5169 return bpf_base_func_proto(func_id);
5170}
5171
5172BPF_CALL_1(bpf_sys_close, u32, fd)
5173{
5174 /* When bpf program calls this helper there should not be
5175 * an fdget() without matching completed fdput().
5176 * This helper is allowed in the following callchain only:
5177 * sys_bpf->prog_test_run->bpf_prog->bpf_sys_close
5178 */
5179 return close_fd(fd);
5180}
5181
5182static const struct bpf_func_proto bpf_sys_close_proto = {
5183 .func = bpf_sys_close,
5184 .gpl_only = false,
5185 .ret_type = RET_INTEGER,
5186 .arg1_type = ARG_ANYTHING,
5187};
5188
5189BPF_CALL_4(bpf_kallsyms_lookup_name, const char *, name, int, name_sz, int, flags, u64 *, res)
5190{
5191 if (flags)
5192 return -EINVAL;
5193
5194 if (name_sz <= 1 || name[name_sz - 1])
5195 return -EINVAL;
5196
5197 if (!bpf_dump_raw_ok(current_cred()))
5198 return -EPERM;
5199
5200 *res = kallsyms_lookup_name(name);
5201 return *res ? 0 : -ENOENT;
5202}
5203
5204static const struct bpf_func_proto bpf_kallsyms_lookup_name_proto = {
5205 .func = bpf_kallsyms_lookup_name,
5206 .gpl_only = false,
5207 .ret_type = RET_INTEGER,
5208 .arg1_type = ARG_PTR_TO_MEM,
5209 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
5210 .arg3_type = ARG_ANYTHING,
5211 .arg4_type = ARG_PTR_TO_LONG,
5212};
5213
5214static const struct bpf_func_proto *
5215syscall_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5216{
5217 switch (func_id) {
5218 case BPF_FUNC_sys_bpf:
5219 return !perfmon_capable() ? NULL : &bpf_sys_bpf_proto;
5220 case BPF_FUNC_btf_find_by_name_kind:
5221 return &bpf_btf_find_by_name_kind_proto;
5222 case BPF_FUNC_sys_close:
5223 return &bpf_sys_close_proto;
5224 case BPF_FUNC_kallsyms_lookup_name:
5225 return &bpf_kallsyms_lookup_name_proto;
5226 default:
5227 return tracing_prog_func_proto(func_id, prog);
5228 }
5229}
5230
5231const struct bpf_verifier_ops bpf_syscall_verifier_ops = {
5232 .get_func_proto = syscall_prog_func_proto,
5233 .is_valid_access = syscall_prog_is_valid_access,
5234};
5235
5236const struct bpf_prog_ops bpf_syscall_prog_ops = {
5237 .test_run = bpf_prog_test_run_syscall,
5238};
5239
5240#ifdef CONFIG_SYSCTL
5241static int bpf_stats_handler(struct ctl_table *table, int write,
5242 void *buffer, size_t *lenp, loff_t *ppos)
5243{
5244 struct static_key *key = (struct static_key *)table->data;
5245 static int saved_val;
5246 int val, ret;
5247 struct ctl_table tmp = {
5248 .data = &val,
5249 .maxlen = sizeof(val),
5250 .mode = table->mode,
5251 .extra1 = SYSCTL_ZERO,
5252 .extra2 = SYSCTL_ONE,
5253 };
5254
5255 if (write && !capable(CAP_SYS_ADMIN))
5256 return -EPERM;
5257
5258 mutex_lock(&bpf_stats_enabled_mutex);
5259 val = saved_val;
5260 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
5261 if (write && !ret && val != saved_val) {
5262 if (val)
5263 static_key_slow_inc(key);
5264 else
5265 static_key_slow_dec(key);
5266 saved_val = val;
5267 }
5268 mutex_unlock(&bpf_stats_enabled_mutex);
5269 return ret;
5270}
5271
5272void __weak unpriv_ebpf_notify(int new_state)
5273{
5274}
5275
5276static int bpf_unpriv_handler(struct ctl_table *table, int write,
5277 void *buffer, size_t *lenp, loff_t *ppos)
5278{
5279 int ret, unpriv_enable = *(int *)table->data;
5280 bool locked_state = unpriv_enable == 1;
5281 struct ctl_table tmp = *table;
5282
5283 if (write && !capable(CAP_SYS_ADMIN))
5284 return -EPERM;
5285
5286 tmp.data = &unpriv_enable;
5287 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
5288 if (write && !ret) {
5289 if (locked_state && unpriv_enable != 1)
5290 return -EPERM;
5291 *(int *)table->data = unpriv_enable;
5292 }
5293
5294 unpriv_ebpf_notify(unpriv_enable);
5295
5296 return ret;
5297}
5298
5299static struct ctl_table bpf_syscall_table[] = {
5300 {
5301 .procname = "unprivileged_bpf_disabled",
5302 .data = &sysctl_unprivileged_bpf_disabled,
5303 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
5304 .mode = 0644,
5305 .proc_handler = bpf_unpriv_handler,
5306 .extra1 = SYSCTL_ZERO,
5307 .extra2 = SYSCTL_TWO,
5308 },
5309 {
5310 .procname = "bpf_stats_enabled",
5311 .data = &bpf_stats_enabled_key.key,
5312 .maxlen = sizeof(bpf_stats_enabled_key),
5313 .mode = 0644,
5314 .proc_handler = bpf_stats_handler,
5315 },
5316 { }
5317};
5318
5319static int __init bpf_syscall_sysctl_init(void)
5320{
5321 register_sysctl_init("kernel", bpf_syscall_table);
5322 return 0;
5323}
5324late_initcall(bpf_syscall_sysctl_init);
5325#endif /* CONFIG_SYSCTL */
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3 */
4#include <linux/bpf.h>
5#include <linux/bpf_trace.h>
6#include <linux/bpf_lirc.h>
7#include <linux/btf.h>
8#include <linux/syscalls.h>
9#include <linux/slab.h>
10#include <linux/sched/signal.h>
11#include <linux/vmalloc.h>
12#include <linux/mmzone.h>
13#include <linux/anon_inodes.h>
14#include <linux/fdtable.h>
15#include <linux/file.h>
16#include <linux/fs.h>
17#include <linux/license.h>
18#include <linux/filter.h>
19#include <linux/version.h>
20#include <linux/kernel.h>
21#include <linux/idr.h>
22#include <linux/cred.h>
23#include <linux/timekeeping.h>
24#include <linux/ctype.h>
25#include <linux/nospec.h>
26
27#define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \
28 (map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
29 (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
30 (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
31#define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
32#define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_HASH(map))
33
34#define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY)
35
36DEFINE_PER_CPU(int, bpf_prog_active);
37static DEFINE_IDR(prog_idr);
38static DEFINE_SPINLOCK(prog_idr_lock);
39static DEFINE_IDR(map_idr);
40static DEFINE_SPINLOCK(map_idr_lock);
41
42int sysctl_unprivileged_bpf_disabled __read_mostly;
43
44static const struct bpf_map_ops * const bpf_map_types[] = {
45#define BPF_PROG_TYPE(_id, _ops)
46#define BPF_MAP_TYPE(_id, _ops) \
47 [_id] = &_ops,
48#include <linux/bpf_types.h>
49#undef BPF_PROG_TYPE
50#undef BPF_MAP_TYPE
51};
52
53/*
54 * If we're handed a bigger struct than we know of, ensure all the unknown bits
55 * are 0 - i.e. new user-space does not rely on any kernel feature extensions
56 * we don't know about yet.
57 *
58 * There is a ToCToU between this function call and the following
59 * copy_from_user() call. However, this is not a concern since this function is
60 * meant to be a future-proofing of bits.
61 */
62int bpf_check_uarg_tail_zero(void __user *uaddr,
63 size_t expected_size,
64 size_t actual_size)
65{
66 unsigned char __user *addr;
67 unsigned char __user *end;
68 unsigned char val;
69 int err;
70
71 if (unlikely(actual_size > PAGE_SIZE)) /* silly large */
72 return -E2BIG;
73
74 if (unlikely(!access_ok(uaddr, actual_size)))
75 return -EFAULT;
76
77 if (actual_size <= expected_size)
78 return 0;
79
80 addr = uaddr + expected_size;
81 end = uaddr + actual_size;
82
83 for (; addr < end; addr++) {
84 err = get_user(val, addr);
85 if (err)
86 return err;
87 if (val)
88 return -E2BIG;
89 }
90
91 return 0;
92}
93
94const struct bpf_map_ops bpf_map_offload_ops = {
95 .map_alloc = bpf_map_offload_map_alloc,
96 .map_free = bpf_map_offload_map_free,
97 .map_check_btf = map_check_no_btf,
98};
99
100static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
101{
102 const struct bpf_map_ops *ops;
103 u32 type = attr->map_type;
104 struct bpf_map *map;
105 int err;
106
107 if (type >= ARRAY_SIZE(bpf_map_types))
108 return ERR_PTR(-EINVAL);
109 type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types));
110 ops = bpf_map_types[type];
111 if (!ops)
112 return ERR_PTR(-EINVAL);
113
114 if (ops->map_alloc_check) {
115 err = ops->map_alloc_check(attr);
116 if (err)
117 return ERR_PTR(err);
118 }
119 if (attr->map_ifindex)
120 ops = &bpf_map_offload_ops;
121 map = ops->map_alloc(attr);
122 if (IS_ERR(map))
123 return map;
124 map->ops = ops;
125 map->map_type = type;
126 return map;
127}
128
129void *bpf_map_area_alloc(u64 size, int numa_node)
130{
131 /* We really just want to fail instead of triggering OOM killer
132 * under memory pressure, therefore we set __GFP_NORETRY to kmalloc,
133 * which is used for lower order allocation requests.
134 *
135 * It has been observed that higher order allocation requests done by
136 * vmalloc with __GFP_NORETRY being set might fail due to not trying
137 * to reclaim memory from the page cache, thus we set
138 * __GFP_RETRY_MAYFAIL to avoid such situations.
139 */
140
141 const gfp_t flags = __GFP_NOWARN | __GFP_ZERO;
142 void *area;
143
144 if (size >= SIZE_MAX)
145 return NULL;
146
147 if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
148 area = kmalloc_node(size, GFP_USER | __GFP_NORETRY | flags,
149 numa_node);
150 if (area != NULL)
151 return area;
152 }
153
154 return __vmalloc_node_flags_caller(size, numa_node,
155 GFP_KERNEL | __GFP_RETRY_MAYFAIL |
156 flags, __builtin_return_address(0));
157}
158
159void bpf_map_area_free(void *area)
160{
161 kvfree(area);
162}
163
164static u32 bpf_map_flags_retain_permanent(u32 flags)
165{
166 /* Some map creation flags are not tied to the map object but
167 * rather to the map fd instead, so they have no meaning upon
168 * map object inspection since multiple file descriptors with
169 * different (access) properties can exist here. Thus, given
170 * this has zero meaning for the map itself, lets clear these
171 * from here.
172 */
173 return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY);
174}
175
176void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr)
177{
178 map->map_type = attr->map_type;
179 map->key_size = attr->key_size;
180 map->value_size = attr->value_size;
181 map->max_entries = attr->max_entries;
182 map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags);
183 map->numa_node = bpf_map_attr_numa_node(attr);
184}
185
186static int bpf_charge_memlock(struct user_struct *user, u32 pages)
187{
188 unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
189
190 if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) {
191 atomic_long_sub(pages, &user->locked_vm);
192 return -EPERM;
193 }
194 return 0;
195}
196
197static void bpf_uncharge_memlock(struct user_struct *user, u32 pages)
198{
199 if (user)
200 atomic_long_sub(pages, &user->locked_vm);
201}
202
203int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size)
204{
205 u32 pages = round_up(size, PAGE_SIZE) >> PAGE_SHIFT;
206 struct user_struct *user;
207 int ret;
208
209 if (size >= U32_MAX - PAGE_SIZE)
210 return -E2BIG;
211
212 user = get_current_user();
213 ret = bpf_charge_memlock(user, pages);
214 if (ret) {
215 free_uid(user);
216 return ret;
217 }
218
219 mem->pages = pages;
220 mem->user = user;
221
222 return 0;
223}
224
225void bpf_map_charge_finish(struct bpf_map_memory *mem)
226{
227 bpf_uncharge_memlock(mem->user, mem->pages);
228 free_uid(mem->user);
229}
230
231void bpf_map_charge_move(struct bpf_map_memory *dst,
232 struct bpf_map_memory *src)
233{
234 *dst = *src;
235
236 /* Make sure src will not be used for the redundant uncharging. */
237 memset(src, 0, sizeof(struct bpf_map_memory));
238}
239
240int bpf_map_charge_memlock(struct bpf_map *map, u32 pages)
241{
242 int ret;
243
244 ret = bpf_charge_memlock(map->memory.user, pages);
245 if (ret)
246 return ret;
247 map->memory.pages += pages;
248 return ret;
249}
250
251void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages)
252{
253 bpf_uncharge_memlock(map->memory.user, pages);
254 map->memory.pages -= pages;
255}
256
257static int bpf_map_alloc_id(struct bpf_map *map)
258{
259 int id;
260
261 idr_preload(GFP_KERNEL);
262 spin_lock_bh(&map_idr_lock);
263 id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
264 if (id > 0)
265 map->id = id;
266 spin_unlock_bh(&map_idr_lock);
267 idr_preload_end();
268
269 if (WARN_ON_ONCE(!id))
270 return -ENOSPC;
271
272 return id > 0 ? 0 : id;
273}
274
275void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
276{
277 unsigned long flags;
278
279 /* Offloaded maps are removed from the IDR store when their device
280 * disappears - even if someone holds an fd to them they are unusable,
281 * the memory is gone, all ops will fail; they are simply waiting for
282 * refcnt to drop to be freed.
283 */
284 if (!map->id)
285 return;
286
287 if (do_idr_lock)
288 spin_lock_irqsave(&map_idr_lock, flags);
289 else
290 __acquire(&map_idr_lock);
291
292 idr_remove(&map_idr, map->id);
293 map->id = 0;
294
295 if (do_idr_lock)
296 spin_unlock_irqrestore(&map_idr_lock, flags);
297 else
298 __release(&map_idr_lock);
299}
300
301/* called from workqueue */
302static void bpf_map_free_deferred(struct work_struct *work)
303{
304 struct bpf_map *map = container_of(work, struct bpf_map, work);
305 struct bpf_map_memory mem;
306
307 bpf_map_charge_move(&mem, &map->memory);
308 security_bpf_map_free(map);
309 /* implementation dependent freeing */
310 map->ops->map_free(map);
311 bpf_map_charge_finish(&mem);
312}
313
314static void bpf_map_put_uref(struct bpf_map *map)
315{
316 if (atomic_dec_and_test(&map->usercnt)) {
317 if (map->ops->map_release_uref)
318 map->ops->map_release_uref(map);
319 }
320}
321
322/* decrement map refcnt and schedule it for freeing via workqueue
323 * (unrelying map implementation ops->map_free() might sleep)
324 */
325static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
326{
327 if (atomic_dec_and_test(&map->refcnt)) {
328 /* bpf_map_free_id() must be called first */
329 bpf_map_free_id(map, do_idr_lock);
330 btf_put(map->btf);
331 INIT_WORK(&map->work, bpf_map_free_deferred);
332 schedule_work(&map->work);
333 }
334}
335
336void bpf_map_put(struct bpf_map *map)
337{
338 __bpf_map_put(map, true);
339}
340EXPORT_SYMBOL_GPL(bpf_map_put);
341
342void bpf_map_put_with_uref(struct bpf_map *map)
343{
344 bpf_map_put_uref(map);
345 bpf_map_put(map);
346}
347
348static int bpf_map_release(struct inode *inode, struct file *filp)
349{
350 struct bpf_map *map = filp->private_data;
351
352 if (map->ops->map_release)
353 map->ops->map_release(map, filp);
354
355 bpf_map_put_with_uref(map);
356 return 0;
357}
358
359static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f)
360{
361 fmode_t mode = f.file->f_mode;
362
363 /* Our file permissions may have been overridden by global
364 * map permissions facing syscall side.
365 */
366 if (READ_ONCE(map->frozen))
367 mode &= ~FMODE_CAN_WRITE;
368 return mode;
369}
370
371#ifdef CONFIG_PROC_FS
372static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
373{
374 const struct bpf_map *map = filp->private_data;
375 const struct bpf_array *array;
376 u32 owner_prog_type = 0;
377 u32 owner_jited = 0;
378
379 if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) {
380 array = container_of(map, struct bpf_array, map);
381 owner_prog_type = array->owner_prog_type;
382 owner_jited = array->owner_jited;
383 }
384
385 seq_printf(m,
386 "map_type:\t%u\n"
387 "key_size:\t%u\n"
388 "value_size:\t%u\n"
389 "max_entries:\t%u\n"
390 "map_flags:\t%#x\n"
391 "memlock:\t%llu\n"
392 "map_id:\t%u\n"
393 "frozen:\t%u\n",
394 map->map_type,
395 map->key_size,
396 map->value_size,
397 map->max_entries,
398 map->map_flags,
399 map->memory.pages * 1ULL << PAGE_SHIFT,
400 map->id,
401 READ_ONCE(map->frozen));
402
403 if (owner_prog_type) {
404 seq_printf(m, "owner_prog_type:\t%u\n",
405 owner_prog_type);
406 seq_printf(m, "owner_jited:\t%u\n",
407 owner_jited);
408 }
409}
410#endif
411
412static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz,
413 loff_t *ppos)
414{
415 /* We need this handler such that alloc_file() enables
416 * f_mode with FMODE_CAN_READ.
417 */
418 return -EINVAL;
419}
420
421static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf,
422 size_t siz, loff_t *ppos)
423{
424 /* We need this handler such that alloc_file() enables
425 * f_mode with FMODE_CAN_WRITE.
426 */
427 return -EINVAL;
428}
429
430const struct file_operations bpf_map_fops = {
431#ifdef CONFIG_PROC_FS
432 .show_fdinfo = bpf_map_show_fdinfo,
433#endif
434 .release = bpf_map_release,
435 .read = bpf_dummy_read,
436 .write = bpf_dummy_write,
437};
438
439int bpf_map_new_fd(struct bpf_map *map, int flags)
440{
441 int ret;
442
443 ret = security_bpf_map(map, OPEN_FMODE(flags));
444 if (ret < 0)
445 return ret;
446
447 return anon_inode_getfd("bpf-map", &bpf_map_fops, map,
448 flags | O_CLOEXEC);
449}
450
451int bpf_get_file_flag(int flags)
452{
453 if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY))
454 return -EINVAL;
455 if (flags & BPF_F_RDONLY)
456 return O_RDONLY;
457 if (flags & BPF_F_WRONLY)
458 return O_WRONLY;
459 return O_RDWR;
460}
461
462/* helper macro to check that unused fields 'union bpf_attr' are zero */
463#define CHECK_ATTR(CMD) \
464 memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
465 sizeof(attr->CMD##_LAST_FIELD), 0, \
466 sizeof(*attr) - \
467 offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
468 sizeof(attr->CMD##_LAST_FIELD)) != NULL
469
470/* dst and src must have at least BPF_OBJ_NAME_LEN number of bytes.
471 * Return 0 on success and < 0 on error.
472 */
473static int bpf_obj_name_cpy(char *dst, const char *src)
474{
475 const char *end = src + BPF_OBJ_NAME_LEN;
476
477 memset(dst, 0, BPF_OBJ_NAME_LEN);
478 /* Copy all isalnum(), '_' and '.' chars. */
479 while (src < end && *src) {
480 if (!isalnum(*src) &&
481 *src != '_' && *src != '.')
482 return -EINVAL;
483 *dst++ = *src++;
484 }
485
486 /* No '\0' found in BPF_OBJ_NAME_LEN number of bytes */
487 if (src == end)
488 return -EINVAL;
489
490 return 0;
491}
492
493int map_check_no_btf(const struct bpf_map *map,
494 const struct btf *btf,
495 const struct btf_type *key_type,
496 const struct btf_type *value_type)
497{
498 return -ENOTSUPP;
499}
500
501static int map_check_btf(struct bpf_map *map, const struct btf *btf,
502 u32 btf_key_id, u32 btf_value_id)
503{
504 const struct btf_type *key_type, *value_type;
505 u32 key_size, value_size;
506 int ret = 0;
507
508 /* Some maps allow key to be unspecified. */
509 if (btf_key_id) {
510 key_type = btf_type_id_size(btf, &btf_key_id, &key_size);
511 if (!key_type || key_size != map->key_size)
512 return -EINVAL;
513 } else {
514 key_type = btf_type_by_id(btf, 0);
515 if (!map->ops->map_check_btf)
516 return -EINVAL;
517 }
518
519 value_type = btf_type_id_size(btf, &btf_value_id, &value_size);
520 if (!value_type || value_size != map->value_size)
521 return -EINVAL;
522
523 map->spin_lock_off = btf_find_spin_lock(btf, value_type);
524
525 if (map_value_has_spin_lock(map)) {
526 if (map->map_flags & BPF_F_RDONLY_PROG)
527 return -EACCES;
528 if (map->map_type != BPF_MAP_TYPE_HASH &&
529 map->map_type != BPF_MAP_TYPE_ARRAY &&
530 map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
531 map->map_type != BPF_MAP_TYPE_SK_STORAGE)
532 return -ENOTSUPP;
533 if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
534 map->value_size) {
535 WARN_ONCE(1,
536 "verifier bug spin_lock_off %d value_size %d\n",
537 map->spin_lock_off, map->value_size);
538 return -EFAULT;
539 }
540 }
541
542 if (map->ops->map_check_btf)
543 ret = map->ops->map_check_btf(map, btf, key_type, value_type);
544
545 return ret;
546}
547
548#define BPF_MAP_CREATE_LAST_FIELD btf_value_type_id
549/* called via syscall */
550static int map_create(union bpf_attr *attr)
551{
552 int numa_node = bpf_map_attr_numa_node(attr);
553 struct bpf_map_memory mem;
554 struct bpf_map *map;
555 int f_flags;
556 int err;
557
558 err = CHECK_ATTR(BPF_MAP_CREATE);
559 if (err)
560 return -EINVAL;
561
562 f_flags = bpf_get_file_flag(attr->map_flags);
563 if (f_flags < 0)
564 return f_flags;
565
566 if (numa_node != NUMA_NO_NODE &&
567 ((unsigned int)numa_node >= nr_node_ids ||
568 !node_online(numa_node)))
569 return -EINVAL;
570
571 /* find map type and init map: hashtable vs rbtree vs bloom vs ... */
572 map = find_and_alloc_map(attr);
573 if (IS_ERR(map))
574 return PTR_ERR(map);
575
576 err = bpf_obj_name_cpy(map->name, attr->map_name);
577 if (err)
578 goto free_map;
579
580 atomic_set(&map->refcnt, 1);
581 atomic_set(&map->usercnt, 1);
582
583 if (attr->btf_key_type_id || attr->btf_value_type_id) {
584 struct btf *btf;
585
586 if (!attr->btf_value_type_id) {
587 err = -EINVAL;
588 goto free_map;
589 }
590
591 btf = btf_get_by_fd(attr->btf_fd);
592 if (IS_ERR(btf)) {
593 err = PTR_ERR(btf);
594 goto free_map;
595 }
596
597 err = map_check_btf(map, btf, attr->btf_key_type_id,
598 attr->btf_value_type_id);
599 if (err) {
600 btf_put(btf);
601 goto free_map;
602 }
603
604 map->btf = btf;
605 map->btf_key_type_id = attr->btf_key_type_id;
606 map->btf_value_type_id = attr->btf_value_type_id;
607 } else {
608 map->spin_lock_off = -EINVAL;
609 }
610
611 err = security_bpf_map_alloc(map);
612 if (err)
613 goto free_map;
614
615 err = bpf_map_alloc_id(map);
616 if (err)
617 goto free_map_sec;
618
619 err = bpf_map_new_fd(map, f_flags);
620 if (err < 0) {
621 /* failed to allocate fd.
622 * bpf_map_put_with_uref() is needed because the above
623 * bpf_map_alloc_id() has published the map
624 * to the userspace and the userspace may
625 * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
626 */
627 bpf_map_put_with_uref(map);
628 return err;
629 }
630
631 return err;
632
633free_map_sec:
634 security_bpf_map_free(map);
635free_map:
636 btf_put(map->btf);
637 bpf_map_charge_move(&mem, &map->memory);
638 map->ops->map_free(map);
639 bpf_map_charge_finish(&mem);
640 return err;
641}
642
643/* if error is returned, fd is released.
644 * On success caller should complete fd access with matching fdput()
645 */
646struct bpf_map *__bpf_map_get(struct fd f)
647{
648 if (!f.file)
649 return ERR_PTR(-EBADF);
650 if (f.file->f_op != &bpf_map_fops) {
651 fdput(f);
652 return ERR_PTR(-EINVAL);
653 }
654
655 return f.file->private_data;
656}
657
658/* prog's and map's refcnt limit */
659#define BPF_MAX_REFCNT 32768
660
661struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref)
662{
663 if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) {
664 atomic_dec(&map->refcnt);
665 return ERR_PTR(-EBUSY);
666 }
667 if (uref)
668 atomic_inc(&map->usercnt);
669 return map;
670}
671EXPORT_SYMBOL_GPL(bpf_map_inc);
672
673struct bpf_map *bpf_map_get_with_uref(u32 ufd)
674{
675 struct fd f = fdget(ufd);
676 struct bpf_map *map;
677
678 map = __bpf_map_get(f);
679 if (IS_ERR(map))
680 return map;
681
682 map = bpf_map_inc(map, true);
683 fdput(f);
684
685 return map;
686}
687
688/* map_idr_lock should have been held */
689static struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map,
690 bool uref)
691{
692 int refold;
693
694 refold = atomic_fetch_add_unless(&map->refcnt, 1, 0);
695
696 if (refold >= BPF_MAX_REFCNT) {
697 __bpf_map_put(map, false);
698 return ERR_PTR(-EBUSY);
699 }
700
701 if (!refold)
702 return ERR_PTR(-ENOENT);
703
704 if (uref)
705 atomic_inc(&map->usercnt);
706
707 return map;
708}
709
710struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map, bool uref)
711{
712 spin_lock_bh(&map_idr_lock);
713 map = __bpf_map_inc_not_zero(map, uref);
714 spin_unlock_bh(&map_idr_lock);
715
716 return map;
717}
718EXPORT_SYMBOL_GPL(bpf_map_inc_not_zero);
719
720int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
721{
722 return -ENOTSUPP;
723}
724
725static void *__bpf_copy_key(void __user *ukey, u64 key_size)
726{
727 if (key_size)
728 return memdup_user(ukey, key_size);
729
730 if (ukey)
731 return ERR_PTR(-EINVAL);
732
733 return NULL;
734}
735
736/* last field in 'union bpf_attr' used by this command */
737#define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags
738
739static int map_lookup_elem(union bpf_attr *attr)
740{
741 void __user *ukey = u64_to_user_ptr(attr->key);
742 void __user *uvalue = u64_to_user_ptr(attr->value);
743 int ufd = attr->map_fd;
744 struct bpf_map *map;
745 void *key, *value, *ptr;
746 u32 value_size;
747 struct fd f;
748 int err;
749
750 if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
751 return -EINVAL;
752
753 if (attr->flags & ~BPF_F_LOCK)
754 return -EINVAL;
755
756 f = fdget(ufd);
757 map = __bpf_map_get(f);
758 if (IS_ERR(map))
759 return PTR_ERR(map);
760 if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
761 err = -EPERM;
762 goto err_put;
763 }
764
765 if ((attr->flags & BPF_F_LOCK) &&
766 !map_value_has_spin_lock(map)) {
767 err = -EINVAL;
768 goto err_put;
769 }
770
771 key = __bpf_copy_key(ukey, map->key_size);
772 if (IS_ERR(key)) {
773 err = PTR_ERR(key);
774 goto err_put;
775 }
776
777 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
778 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
779 map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
780 map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
781 value_size = round_up(map->value_size, 8) * num_possible_cpus();
782 else if (IS_FD_MAP(map))
783 value_size = sizeof(u32);
784 else
785 value_size = map->value_size;
786
787 err = -ENOMEM;
788 value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
789 if (!value)
790 goto free_key;
791
792 if (bpf_map_is_dev_bound(map)) {
793 err = bpf_map_offload_lookup_elem(map, key, value);
794 goto done;
795 }
796
797 preempt_disable();
798 this_cpu_inc(bpf_prog_active);
799 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
800 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
801 err = bpf_percpu_hash_copy(map, key, value);
802 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
803 err = bpf_percpu_array_copy(map, key, value);
804 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
805 err = bpf_percpu_cgroup_storage_copy(map, key, value);
806 } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
807 err = bpf_stackmap_copy(map, key, value);
808 } else if (IS_FD_ARRAY(map)) {
809 err = bpf_fd_array_map_lookup_elem(map, key, value);
810 } else if (IS_FD_HASH(map)) {
811 err = bpf_fd_htab_map_lookup_elem(map, key, value);
812 } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
813 err = bpf_fd_reuseport_array_lookup_elem(map, key, value);
814 } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
815 map->map_type == BPF_MAP_TYPE_STACK) {
816 err = map->ops->map_peek_elem(map, value);
817 } else {
818 rcu_read_lock();
819 if (map->ops->map_lookup_elem_sys_only)
820 ptr = map->ops->map_lookup_elem_sys_only(map, key);
821 else
822 ptr = map->ops->map_lookup_elem(map, key);
823 if (IS_ERR(ptr)) {
824 err = PTR_ERR(ptr);
825 } else if (!ptr) {
826 err = -ENOENT;
827 } else {
828 err = 0;
829 if (attr->flags & BPF_F_LOCK)
830 /* lock 'ptr' and copy everything but lock */
831 copy_map_value_locked(map, value, ptr, true);
832 else
833 copy_map_value(map, value, ptr);
834 /* mask lock, since value wasn't zero inited */
835 check_and_init_map_lock(map, value);
836 }
837 rcu_read_unlock();
838 }
839 this_cpu_dec(bpf_prog_active);
840 preempt_enable();
841
842done:
843 if (err)
844 goto free_value;
845
846 err = -EFAULT;
847 if (copy_to_user(uvalue, value, value_size) != 0)
848 goto free_value;
849
850 err = 0;
851
852free_value:
853 kfree(value);
854free_key:
855 kfree(key);
856err_put:
857 fdput(f);
858 return err;
859}
860
861static void maybe_wait_bpf_programs(struct bpf_map *map)
862{
863 /* Wait for any running BPF programs to complete so that
864 * userspace, when we return to it, knows that all programs
865 * that could be running use the new map value.
866 */
867 if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS ||
868 map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
869 synchronize_rcu();
870}
871
872#define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
873
874static int map_update_elem(union bpf_attr *attr)
875{
876 void __user *ukey = u64_to_user_ptr(attr->key);
877 void __user *uvalue = u64_to_user_ptr(attr->value);
878 int ufd = attr->map_fd;
879 struct bpf_map *map;
880 void *key, *value;
881 u32 value_size;
882 struct fd f;
883 int err;
884
885 if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
886 return -EINVAL;
887
888 f = fdget(ufd);
889 map = __bpf_map_get(f);
890 if (IS_ERR(map))
891 return PTR_ERR(map);
892 if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
893 err = -EPERM;
894 goto err_put;
895 }
896
897 if ((attr->flags & BPF_F_LOCK) &&
898 !map_value_has_spin_lock(map)) {
899 err = -EINVAL;
900 goto err_put;
901 }
902
903 key = __bpf_copy_key(ukey, map->key_size);
904 if (IS_ERR(key)) {
905 err = PTR_ERR(key);
906 goto err_put;
907 }
908
909 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
910 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
911 map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
912 map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
913 value_size = round_up(map->value_size, 8) * num_possible_cpus();
914 else
915 value_size = map->value_size;
916
917 err = -ENOMEM;
918 value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
919 if (!value)
920 goto free_key;
921
922 err = -EFAULT;
923 if (copy_from_user(value, uvalue, value_size) != 0)
924 goto free_value;
925
926 /* Need to create a kthread, thus must support schedule */
927 if (bpf_map_is_dev_bound(map)) {
928 err = bpf_map_offload_update_elem(map, key, value, attr->flags);
929 goto out;
930 } else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
931 map->map_type == BPF_MAP_TYPE_SOCKHASH ||
932 map->map_type == BPF_MAP_TYPE_SOCKMAP) {
933 err = map->ops->map_update_elem(map, key, value, attr->flags);
934 goto out;
935 }
936
937 /* must increment bpf_prog_active to avoid kprobe+bpf triggering from
938 * inside bpf map update or delete otherwise deadlocks are possible
939 */
940 preempt_disable();
941 __this_cpu_inc(bpf_prog_active);
942 if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
943 map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
944 err = bpf_percpu_hash_update(map, key, value, attr->flags);
945 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
946 err = bpf_percpu_array_update(map, key, value, attr->flags);
947 } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
948 err = bpf_percpu_cgroup_storage_update(map, key, value,
949 attr->flags);
950 } else if (IS_FD_ARRAY(map)) {
951 rcu_read_lock();
952 err = bpf_fd_array_map_update_elem(map, f.file, key, value,
953 attr->flags);
954 rcu_read_unlock();
955 } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
956 rcu_read_lock();
957 err = bpf_fd_htab_map_update_elem(map, f.file, key, value,
958 attr->flags);
959 rcu_read_unlock();
960 } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
961 /* rcu_read_lock() is not needed */
962 err = bpf_fd_reuseport_array_update_elem(map, key, value,
963 attr->flags);
964 } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
965 map->map_type == BPF_MAP_TYPE_STACK) {
966 err = map->ops->map_push_elem(map, value, attr->flags);
967 } else {
968 rcu_read_lock();
969 err = map->ops->map_update_elem(map, key, value, attr->flags);
970 rcu_read_unlock();
971 }
972 __this_cpu_dec(bpf_prog_active);
973 preempt_enable();
974 maybe_wait_bpf_programs(map);
975out:
976free_value:
977 kfree(value);
978free_key:
979 kfree(key);
980err_put:
981 fdput(f);
982 return err;
983}
984
985#define BPF_MAP_DELETE_ELEM_LAST_FIELD key
986
987static int map_delete_elem(union bpf_attr *attr)
988{
989 void __user *ukey = u64_to_user_ptr(attr->key);
990 int ufd = attr->map_fd;
991 struct bpf_map *map;
992 struct fd f;
993 void *key;
994 int err;
995
996 if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
997 return -EINVAL;
998
999 f = fdget(ufd);
1000 map = __bpf_map_get(f);
1001 if (IS_ERR(map))
1002 return PTR_ERR(map);
1003 if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
1004 err = -EPERM;
1005 goto err_put;
1006 }
1007
1008 key = __bpf_copy_key(ukey, map->key_size);
1009 if (IS_ERR(key)) {
1010 err = PTR_ERR(key);
1011 goto err_put;
1012 }
1013
1014 if (bpf_map_is_dev_bound(map)) {
1015 err = bpf_map_offload_delete_elem(map, key);
1016 goto out;
1017 }
1018
1019 preempt_disable();
1020 __this_cpu_inc(bpf_prog_active);
1021 rcu_read_lock();
1022 err = map->ops->map_delete_elem(map, key);
1023 rcu_read_unlock();
1024 __this_cpu_dec(bpf_prog_active);
1025 preempt_enable();
1026 maybe_wait_bpf_programs(map);
1027out:
1028 kfree(key);
1029err_put:
1030 fdput(f);
1031 return err;
1032}
1033
1034/* last field in 'union bpf_attr' used by this command */
1035#define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
1036
1037static int map_get_next_key(union bpf_attr *attr)
1038{
1039 void __user *ukey = u64_to_user_ptr(attr->key);
1040 void __user *unext_key = u64_to_user_ptr(attr->next_key);
1041 int ufd = attr->map_fd;
1042 struct bpf_map *map;
1043 void *key, *next_key;
1044 struct fd f;
1045 int err;
1046
1047 if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
1048 return -EINVAL;
1049
1050 f = fdget(ufd);
1051 map = __bpf_map_get(f);
1052 if (IS_ERR(map))
1053 return PTR_ERR(map);
1054 if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
1055 err = -EPERM;
1056 goto err_put;
1057 }
1058
1059 if (ukey) {
1060 key = __bpf_copy_key(ukey, map->key_size);
1061 if (IS_ERR(key)) {
1062 err = PTR_ERR(key);
1063 goto err_put;
1064 }
1065 } else {
1066 key = NULL;
1067 }
1068
1069 err = -ENOMEM;
1070 next_key = kmalloc(map->key_size, GFP_USER);
1071 if (!next_key)
1072 goto free_key;
1073
1074 if (bpf_map_is_dev_bound(map)) {
1075 err = bpf_map_offload_get_next_key(map, key, next_key);
1076 goto out;
1077 }
1078
1079 rcu_read_lock();
1080 err = map->ops->map_get_next_key(map, key, next_key);
1081 rcu_read_unlock();
1082out:
1083 if (err)
1084 goto free_next_key;
1085
1086 err = -EFAULT;
1087 if (copy_to_user(unext_key, next_key, map->key_size) != 0)
1088 goto free_next_key;
1089
1090 err = 0;
1091
1092free_next_key:
1093 kfree(next_key);
1094free_key:
1095 kfree(key);
1096err_put:
1097 fdput(f);
1098 return err;
1099}
1100
1101#define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD value
1102
1103static int map_lookup_and_delete_elem(union bpf_attr *attr)
1104{
1105 void __user *ukey = u64_to_user_ptr(attr->key);
1106 void __user *uvalue = u64_to_user_ptr(attr->value);
1107 int ufd = attr->map_fd;
1108 struct bpf_map *map;
1109 void *key, *value;
1110 u32 value_size;
1111 struct fd f;
1112 int err;
1113
1114 if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM))
1115 return -EINVAL;
1116
1117 f = fdget(ufd);
1118 map = __bpf_map_get(f);
1119 if (IS_ERR(map))
1120 return PTR_ERR(map);
1121 if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
1122 err = -EPERM;
1123 goto err_put;
1124 }
1125
1126 key = __bpf_copy_key(ukey, map->key_size);
1127 if (IS_ERR(key)) {
1128 err = PTR_ERR(key);
1129 goto err_put;
1130 }
1131
1132 value_size = map->value_size;
1133
1134 err = -ENOMEM;
1135 value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
1136 if (!value)
1137 goto free_key;
1138
1139 if (map->map_type == BPF_MAP_TYPE_QUEUE ||
1140 map->map_type == BPF_MAP_TYPE_STACK) {
1141 err = map->ops->map_pop_elem(map, value);
1142 } else {
1143 err = -ENOTSUPP;
1144 }
1145
1146 if (err)
1147 goto free_value;
1148
1149 if (copy_to_user(uvalue, value, value_size) != 0)
1150 goto free_value;
1151
1152 err = 0;
1153
1154free_value:
1155 kfree(value);
1156free_key:
1157 kfree(key);
1158err_put:
1159 fdput(f);
1160 return err;
1161}
1162
1163#define BPF_MAP_FREEZE_LAST_FIELD map_fd
1164
1165static int map_freeze(const union bpf_attr *attr)
1166{
1167 int err = 0, ufd = attr->map_fd;
1168 struct bpf_map *map;
1169 struct fd f;
1170
1171 if (CHECK_ATTR(BPF_MAP_FREEZE))
1172 return -EINVAL;
1173
1174 f = fdget(ufd);
1175 map = __bpf_map_get(f);
1176 if (IS_ERR(map))
1177 return PTR_ERR(map);
1178 if (READ_ONCE(map->frozen)) {
1179 err = -EBUSY;
1180 goto err_put;
1181 }
1182 if (!capable(CAP_SYS_ADMIN)) {
1183 err = -EPERM;
1184 goto err_put;
1185 }
1186
1187 WRITE_ONCE(map->frozen, true);
1188err_put:
1189 fdput(f);
1190 return err;
1191}
1192
1193static const struct bpf_prog_ops * const bpf_prog_types[] = {
1194#define BPF_PROG_TYPE(_id, _name) \
1195 [_id] = & _name ## _prog_ops,
1196#define BPF_MAP_TYPE(_id, _ops)
1197#include <linux/bpf_types.h>
1198#undef BPF_PROG_TYPE
1199#undef BPF_MAP_TYPE
1200};
1201
1202static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
1203{
1204 const struct bpf_prog_ops *ops;
1205
1206 if (type >= ARRAY_SIZE(bpf_prog_types))
1207 return -EINVAL;
1208 type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types));
1209 ops = bpf_prog_types[type];
1210 if (!ops)
1211 return -EINVAL;
1212
1213 if (!bpf_prog_is_dev_bound(prog->aux))
1214 prog->aux->ops = ops;
1215 else
1216 prog->aux->ops = &bpf_offload_prog_ops;
1217 prog->type = type;
1218 return 0;
1219}
1220
1221/* drop refcnt on maps used by eBPF program and free auxilary data */
1222static void free_used_maps(struct bpf_prog_aux *aux)
1223{
1224 enum bpf_cgroup_storage_type stype;
1225 int i;
1226
1227 for_each_cgroup_storage_type(stype) {
1228 if (!aux->cgroup_storage[stype])
1229 continue;
1230 bpf_cgroup_storage_release(aux->prog,
1231 aux->cgroup_storage[stype]);
1232 }
1233
1234 for (i = 0; i < aux->used_map_cnt; i++)
1235 bpf_map_put(aux->used_maps[i]);
1236
1237 kfree(aux->used_maps);
1238}
1239
1240int __bpf_prog_charge(struct user_struct *user, u32 pages)
1241{
1242 unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
1243 unsigned long user_bufs;
1244
1245 if (user) {
1246 user_bufs = atomic_long_add_return(pages, &user->locked_vm);
1247 if (user_bufs > memlock_limit) {
1248 atomic_long_sub(pages, &user->locked_vm);
1249 return -EPERM;
1250 }
1251 }
1252
1253 return 0;
1254}
1255
1256void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
1257{
1258 if (user)
1259 atomic_long_sub(pages, &user->locked_vm);
1260}
1261
1262static int bpf_prog_charge_memlock(struct bpf_prog *prog)
1263{
1264 struct user_struct *user = get_current_user();
1265 int ret;
1266
1267 ret = __bpf_prog_charge(user, prog->pages);
1268 if (ret) {
1269 free_uid(user);
1270 return ret;
1271 }
1272
1273 prog->aux->user = user;
1274 return 0;
1275}
1276
1277static void bpf_prog_uncharge_memlock(struct bpf_prog *prog)
1278{
1279 struct user_struct *user = prog->aux->user;
1280
1281 __bpf_prog_uncharge(user, prog->pages);
1282 free_uid(user);
1283}
1284
1285static int bpf_prog_alloc_id(struct bpf_prog *prog)
1286{
1287 int id;
1288
1289 idr_preload(GFP_KERNEL);
1290 spin_lock_bh(&prog_idr_lock);
1291 id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
1292 if (id > 0)
1293 prog->aux->id = id;
1294 spin_unlock_bh(&prog_idr_lock);
1295 idr_preload_end();
1296
1297 /* id is in [1, INT_MAX) */
1298 if (WARN_ON_ONCE(!id))
1299 return -ENOSPC;
1300
1301 return id > 0 ? 0 : id;
1302}
1303
1304void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock)
1305{
1306 /* cBPF to eBPF migrations are currently not in the idr store.
1307 * Offloaded programs are removed from the store when their device
1308 * disappears - even if someone grabs an fd to them they are unusable,
1309 * simply waiting for refcnt to drop to be freed.
1310 */
1311 if (!prog->aux->id)
1312 return;
1313
1314 if (do_idr_lock)
1315 spin_lock_bh(&prog_idr_lock);
1316 else
1317 __acquire(&prog_idr_lock);
1318
1319 idr_remove(&prog_idr, prog->aux->id);
1320 prog->aux->id = 0;
1321
1322 if (do_idr_lock)
1323 spin_unlock_bh(&prog_idr_lock);
1324 else
1325 __release(&prog_idr_lock);
1326}
1327
1328static void __bpf_prog_put_rcu(struct rcu_head *rcu)
1329{
1330 struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
1331
1332 kvfree(aux->func_info);
1333 free_used_maps(aux);
1334 bpf_prog_uncharge_memlock(aux->prog);
1335 security_bpf_prog_free(aux);
1336 bpf_prog_free(aux->prog);
1337}
1338
1339static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred)
1340{
1341 bpf_prog_kallsyms_del_all(prog);
1342 btf_put(prog->aux->btf);
1343 bpf_prog_free_linfo(prog);
1344
1345 if (deferred)
1346 call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
1347 else
1348 __bpf_prog_put_rcu(&prog->aux->rcu);
1349}
1350
1351static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
1352{
1353 if (atomic_dec_and_test(&prog->aux->refcnt)) {
1354 perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
1355 /* bpf_prog_free_id() must be called first */
1356 bpf_prog_free_id(prog, do_idr_lock);
1357 __bpf_prog_put_noref(prog, true);
1358 }
1359}
1360
1361void bpf_prog_put(struct bpf_prog *prog)
1362{
1363 __bpf_prog_put(prog, true);
1364}
1365EXPORT_SYMBOL_GPL(bpf_prog_put);
1366
1367static int bpf_prog_release(struct inode *inode, struct file *filp)
1368{
1369 struct bpf_prog *prog = filp->private_data;
1370
1371 bpf_prog_put(prog);
1372 return 0;
1373}
1374
1375static void bpf_prog_get_stats(const struct bpf_prog *prog,
1376 struct bpf_prog_stats *stats)
1377{
1378 u64 nsecs = 0, cnt = 0;
1379 int cpu;
1380
1381 for_each_possible_cpu(cpu) {
1382 const struct bpf_prog_stats *st;
1383 unsigned int start;
1384 u64 tnsecs, tcnt;
1385
1386 st = per_cpu_ptr(prog->aux->stats, cpu);
1387 do {
1388 start = u64_stats_fetch_begin_irq(&st->syncp);
1389 tnsecs = st->nsecs;
1390 tcnt = st->cnt;
1391 } while (u64_stats_fetch_retry_irq(&st->syncp, start));
1392 nsecs += tnsecs;
1393 cnt += tcnt;
1394 }
1395 stats->nsecs = nsecs;
1396 stats->cnt = cnt;
1397}
1398
1399#ifdef CONFIG_PROC_FS
1400static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp)
1401{
1402 const struct bpf_prog *prog = filp->private_data;
1403 char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
1404 struct bpf_prog_stats stats;
1405
1406 bpf_prog_get_stats(prog, &stats);
1407 bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
1408 seq_printf(m,
1409 "prog_type:\t%u\n"
1410 "prog_jited:\t%u\n"
1411 "prog_tag:\t%s\n"
1412 "memlock:\t%llu\n"
1413 "prog_id:\t%u\n"
1414 "run_time_ns:\t%llu\n"
1415 "run_cnt:\t%llu\n",
1416 prog->type,
1417 prog->jited,
1418 prog_tag,
1419 prog->pages * 1ULL << PAGE_SHIFT,
1420 prog->aux->id,
1421 stats.nsecs,
1422 stats.cnt);
1423}
1424#endif
1425
1426const struct file_operations bpf_prog_fops = {
1427#ifdef CONFIG_PROC_FS
1428 .show_fdinfo = bpf_prog_show_fdinfo,
1429#endif
1430 .release = bpf_prog_release,
1431 .read = bpf_dummy_read,
1432 .write = bpf_dummy_write,
1433};
1434
1435int bpf_prog_new_fd(struct bpf_prog *prog)
1436{
1437 int ret;
1438
1439 ret = security_bpf_prog(prog);
1440 if (ret < 0)
1441 return ret;
1442
1443 return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog,
1444 O_RDWR | O_CLOEXEC);
1445}
1446
1447static struct bpf_prog *____bpf_prog_get(struct fd f)
1448{
1449 if (!f.file)
1450 return ERR_PTR(-EBADF);
1451 if (f.file->f_op != &bpf_prog_fops) {
1452 fdput(f);
1453 return ERR_PTR(-EINVAL);
1454 }
1455
1456 return f.file->private_data;
1457}
1458
1459struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i)
1460{
1461 if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) {
1462 atomic_sub(i, &prog->aux->refcnt);
1463 return ERR_PTR(-EBUSY);
1464 }
1465 return prog;
1466}
1467EXPORT_SYMBOL_GPL(bpf_prog_add);
1468
1469void bpf_prog_sub(struct bpf_prog *prog, int i)
1470{
1471 /* Only to be used for undoing previous bpf_prog_add() in some
1472 * error path. We still know that another entity in our call
1473 * path holds a reference to the program, thus atomic_sub() can
1474 * be safely used in such cases!
1475 */
1476 WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0);
1477}
1478EXPORT_SYMBOL_GPL(bpf_prog_sub);
1479
1480struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
1481{
1482 return bpf_prog_add(prog, 1);
1483}
1484EXPORT_SYMBOL_GPL(bpf_prog_inc);
1485
1486/* prog_idr_lock should have been held */
1487struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
1488{
1489 int refold;
1490
1491 refold = atomic_fetch_add_unless(&prog->aux->refcnt, 1, 0);
1492
1493 if (refold >= BPF_MAX_REFCNT) {
1494 __bpf_prog_put(prog, false);
1495 return ERR_PTR(-EBUSY);
1496 }
1497
1498 if (!refold)
1499 return ERR_PTR(-ENOENT);
1500
1501 return prog;
1502}
1503EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
1504
1505bool bpf_prog_get_ok(struct bpf_prog *prog,
1506 enum bpf_prog_type *attach_type, bool attach_drv)
1507{
1508 /* not an attachment, just a refcount inc, always allow */
1509 if (!attach_type)
1510 return true;
1511
1512 if (prog->type != *attach_type)
1513 return false;
1514 if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv)
1515 return false;
1516
1517 return true;
1518}
1519
1520static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
1521 bool attach_drv)
1522{
1523 struct fd f = fdget(ufd);
1524 struct bpf_prog *prog;
1525
1526 prog = ____bpf_prog_get(f);
1527 if (IS_ERR(prog))
1528 return prog;
1529 if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) {
1530 prog = ERR_PTR(-EINVAL);
1531 goto out;
1532 }
1533
1534 prog = bpf_prog_inc(prog);
1535out:
1536 fdput(f);
1537 return prog;
1538}
1539
1540struct bpf_prog *bpf_prog_get(u32 ufd)
1541{
1542 return __bpf_prog_get(ufd, NULL, false);
1543}
1544
1545struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
1546 bool attach_drv)
1547{
1548 return __bpf_prog_get(ufd, &type, attach_drv);
1549}
1550EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev);
1551
1552/* Initially all BPF programs could be loaded w/o specifying
1553 * expected_attach_type. Later for some of them specifying expected_attach_type
1554 * at load time became required so that program could be validated properly.
1555 * Programs of types that are allowed to be loaded both w/ and w/o (for
1556 * backward compatibility) expected_attach_type, should have the default attach
1557 * type assigned to expected_attach_type for the latter case, so that it can be
1558 * validated later at attach time.
1559 *
1560 * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if
1561 * prog type requires it but has some attach types that have to be backward
1562 * compatible.
1563 */
1564static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr)
1565{
1566 switch (attr->prog_type) {
1567 case BPF_PROG_TYPE_CGROUP_SOCK:
1568 /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't
1569 * exist so checking for non-zero is the way to go here.
1570 */
1571 if (!attr->expected_attach_type)
1572 attr->expected_attach_type =
1573 BPF_CGROUP_INET_SOCK_CREATE;
1574 break;
1575 }
1576}
1577
1578static int
1579bpf_prog_load_check_attach_type(enum bpf_prog_type prog_type,
1580 enum bpf_attach_type expected_attach_type)
1581{
1582 switch (prog_type) {
1583 case BPF_PROG_TYPE_CGROUP_SOCK:
1584 switch (expected_attach_type) {
1585 case BPF_CGROUP_INET_SOCK_CREATE:
1586 case BPF_CGROUP_INET4_POST_BIND:
1587 case BPF_CGROUP_INET6_POST_BIND:
1588 return 0;
1589 default:
1590 return -EINVAL;
1591 }
1592 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
1593 switch (expected_attach_type) {
1594 case BPF_CGROUP_INET4_BIND:
1595 case BPF_CGROUP_INET6_BIND:
1596 case BPF_CGROUP_INET4_CONNECT:
1597 case BPF_CGROUP_INET6_CONNECT:
1598 case BPF_CGROUP_UDP4_SENDMSG:
1599 case BPF_CGROUP_UDP6_SENDMSG:
1600 case BPF_CGROUP_UDP4_RECVMSG:
1601 case BPF_CGROUP_UDP6_RECVMSG:
1602 return 0;
1603 default:
1604 return -EINVAL;
1605 }
1606 case BPF_PROG_TYPE_CGROUP_SKB:
1607 switch (expected_attach_type) {
1608 case BPF_CGROUP_INET_INGRESS:
1609 case BPF_CGROUP_INET_EGRESS:
1610 return 0;
1611 default:
1612 return -EINVAL;
1613 }
1614 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
1615 switch (expected_attach_type) {
1616 case BPF_CGROUP_SETSOCKOPT:
1617 case BPF_CGROUP_GETSOCKOPT:
1618 return 0;
1619 default:
1620 return -EINVAL;
1621 }
1622 default:
1623 return 0;
1624 }
1625}
1626
1627/* last field in 'union bpf_attr' used by this command */
1628#define BPF_PROG_LOAD_LAST_FIELD line_info_cnt
1629
1630static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
1631{
1632 enum bpf_prog_type type = attr->prog_type;
1633 struct bpf_prog *prog;
1634 int err;
1635 char license[128];
1636 bool is_gpl;
1637
1638 if (CHECK_ATTR(BPF_PROG_LOAD))
1639 return -EINVAL;
1640
1641 if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
1642 BPF_F_ANY_ALIGNMENT |
1643 BPF_F_TEST_STATE_FREQ |
1644 BPF_F_TEST_RND_HI32))
1645 return -EINVAL;
1646
1647 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
1648 (attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
1649 !capable(CAP_SYS_ADMIN))
1650 return -EPERM;
1651
1652 /* copy eBPF program license from user space */
1653 if (strncpy_from_user(license, u64_to_user_ptr(attr->license),
1654 sizeof(license) - 1) < 0)
1655 return -EFAULT;
1656 license[sizeof(license) - 1] = 0;
1657
1658 /* eBPF programs must be GPL compatible to use GPL-ed functions */
1659 is_gpl = license_is_gpl_compatible(license);
1660
1661 if (attr->insn_cnt == 0 ||
1662 attr->insn_cnt > (capable(CAP_SYS_ADMIN) ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
1663 return -E2BIG;
1664 if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
1665 type != BPF_PROG_TYPE_CGROUP_SKB &&
1666 !capable(CAP_SYS_ADMIN))
1667 return -EPERM;
1668
1669 bpf_prog_load_fixup_attach_type(attr);
1670 if (bpf_prog_load_check_attach_type(type, attr->expected_attach_type))
1671 return -EINVAL;
1672
1673 /* plain bpf_prog allocation */
1674 prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
1675 if (!prog)
1676 return -ENOMEM;
1677
1678 prog->expected_attach_type = attr->expected_attach_type;
1679
1680 prog->aux->offload_requested = !!attr->prog_ifindex;
1681
1682 err = security_bpf_prog_alloc(prog->aux);
1683 if (err)
1684 goto free_prog_nouncharge;
1685
1686 err = bpf_prog_charge_memlock(prog);
1687 if (err)
1688 goto free_prog_sec;
1689
1690 prog->len = attr->insn_cnt;
1691
1692 err = -EFAULT;
1693 if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns),
1694 bpf_prog_insn_size(prog)) != 0)
1695 goto free_prog;
1696
1697 prog->orig_prog = NULL;
1698 prog->jited = 0;
1699
1700 atomic_set(&prog->aux->refcnt, 1);
1701 prog->gpl_compatible = is_gpl ? 1 : 0;
1702
1703 if (bpf_prog_is_dev_bound(prog->aux)) {
1704 err = bpf_prog_offload_init(prog, attr);
1705 if (err)
1706 goto free_prog;
1707 }
1708
1709 /* find program type: socket_filter vs tracing_filter */
1710 err = find_prog_type(type, prog);
1711 if (err < 0)
1712 goto free_prog;
1713
1714 prog->aux->load_time = ktime_get_boottime_ns();
1715 err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name);
1716 if (err)
1717 goto free_prog;
1718
1719 /* run eBPF verifier */
1720 err = bpf_check(&prog, attr, uattr);
1721 if (err < 0)
1722 goto free_used_maps;
1723
1724 prog = bpf_prog_select_runtime(prog, &err);
1725 if (err < 0)
1726 goto free_used_maps;
1727
1728 err = bpf_prog_alloc_id(prog);
1729 if (err)
1730 goto free_used_maps;
1731
1732 /* Upon success of bpf_prog_alloc_id(), the BPF prog is
1733 * effectively publicly exposed. However, retrieving via
1734 * bpf_prog_get_fd_by_id() will take another reference,
1735 * therefore it cannot be gone underneath us.
1736 *
1737 * Only for the time /after/ successful bpf_prog_new_fd()
1738 * and before returning to userspace, we might just hold
1739 * one reference and any parallel close on that fd could
1740 * rip everything out. Hence, below notifications must
1741 * happen before bpf_prog_new_fd().
1742 *
1743 * Also, any failure handling from this point onwards must
1744 * be using bpf_prog_put() given the program is exposed.
1745 */
1746 bpf_prog_kallsyms_add(prog);
1747 perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
1748
1749 err = bpf_prog_new_fd(prog);
1750 if (err < 0)
1751 bpf_prog_put(prog);
1752 return err;
1753
1754free_used_maps:
1755 /* In case we have subprogs, we need to wait for a grace
1756 * period before we can tear down JIT memory since symbols
1757 * are already exposed under kallsyms.
1758 */
1759 __bpf_prog_put_noref(prog, prog->aux->func_cnt);
1760 return err;
1761free_prog:
1762 bpf_prog_uncharge_memlock(prog);
1763free_prog_sec:
1764 security_bpf_prog_free(prog->aux);
1765free_prog_nouncharge:
1766 bpf_prog_free(prog);
1767 return err;
1768}
1769
1770#define BPF_OBJ_LAST_FIELD file_flags
1771
1772static int bpf_obj_pin(const union bpf_attr *attr)
1773{
1774 if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0)
1775 return -EINVAL;
1776
1777 return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname));
1778}
1779
1780static int bpf_obj_get(const union bpf_attr *attr)
1781{
1782 if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
1783 attr->file_flags & ~BPF_OBJ_FLAG_MASK)
1784 return -EINVAL;
1785
1786 return bpf_obj_get_user(u64_to_user_ptr(attr->pathname),
1787 attr->file_flags);
1788}
1789
1790struct bpf_raw_tracepoint {
1791 struct bpf_raw_event_map *btp;
1792 struct bpf_prog *prog;
1793};
1794
1795static int bpf_raw_tracepoint_release(struct inode *inode, struct file *filp)
1796{
1797 struct bpf_raw_tracepoint *raw_tp = filp->private_data;
1798
1799 if (raw_tp->prog) {
1800 bpf_probe_unregister(raw_tp->btp, raw_tp->prog);
1801 bpf_prog_put(raw_tp->prog);
1802 }
1803 bpf_put_raw_tracepoint(raw_tp->btp);
1804 kfree(raw_tp);
1805 return 0;
1806}
1807
1808static const struct file_operations bpf_raw_tp_fops = {
1809 .release = bpf_raw_tracepoint_release,
1810 .read = bpf_dummy_read,
1811 .write = bpf_dummy_write,
1812};
1813
1814#define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd
1815
1816static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
1817{
1818 struct bpf_raw_tracepoint *raw_tp;
1819 struct bpf_raw_event_map *btp;
1820 struct bpf_prog *prog;
1821 char tp_name[128];
1822 int tp_fd, err;
1823
1824 if (strncpy_from_user(tp_name, u64_to_user_ptr(attr->raw_tracepoint.name),
1825 sizeof(tp_name) - 1) < 0)
1826 return -EFAULT;
1827 tp_name[sizeof(tp_name) - 1] = 0;
1828
1829 btp = bpf_get_raw_tracepoint(tp_name);
1830 if (!btp)
1831 return -ENOENT;
1832
1833 raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER);
1834 if (!raw_tp) {
1835 err = -ENOMEM;
1836 goto out_put_btp;
1837 }
1838 raw_tp->btp = btp;
1839
1840 prog = bpf_prog_get(attr->raw_tracepoint.prog_fd);
1841 if (IS_ERR(prog)) {
1842 err = PTR_ERR(prog);
1843 goto out_free_tp;
1844 }
1845 if (prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT &&
1846 prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE) {
1847 err = -EINVAL;
1848 goto out_put_prog;
1849 }
1850
1851 err = bpf_probe_register(raw_tp->btp, prog);
1852 if (err)
1853 goto out_put_prog;
1854
1855 raw_tp->prog = prog;
1856 tp_fd = anon_inode_getfd("bpf-raw-tracepoint", &bpf_raw_tp_fops, raw_tp,
1857 O_CLOEXEC);
1858 if (tp_fd < 0) {
1859 bpf_probe_unregister(raw_tp->btp, prog);
1860 err = tp_fd;
1861 goto out_put_prog;
1862 }
1863 return tp_fd;
1864
1865out_put_prog:
1866 bpf_prog_put(prog);
1867out_free_tp:
1868 kfree(raw_tp);
1869out_put_btp:
1870 bpf_put_raw_tracepoint(btp);
1871 return err;
1872}
1873
1874static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
1875 enum bpf_attach_type attach_type)
1876{
1877 switch (prog->type) {
1878 case BPF_PROG_TYPE_CGROUP_SOCK:
1879 case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
1880 case BPF_PROG_TYPE_CGROUP_SOCKOPT:
1881 return attach_type == prog->expected_attach_type ? 0 : -EINVAL;
1882 case BPF_PROG_TYPE_CGROUP_SKB:
1883 return prog->enforce_expected_attach_type &&
1884 prog->expected_attach_type != attach_type ?
1885 -EINVAL : 0;
1886 default:
1887 return 0;
1888 }
1889}
1890
1891#define BPF_PROG_ATTACH_LAST_FIELD attach_flags
1892
1893#define BPF_F_ATTACH_MASK \
1894 (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI)
1895
1896static int bpf_prog_attach(const union bpf_attr *attr)
1897{
1898 enum bpf_prog_type ptype;
1899 struct bpf_prog *prog;
1900 int ret;
1901
1902 if (!capable(CAP_NET_ADMIN))
1903 return -EPERM;
1904
1905 if (CHECK_ATTR(BPF_PROG_ATTACH))
1906 return -EINVAL;
1907
1908 if (attr->attach_flags & ~BPF_F_ATTACH_MASK)
1909 return -EINVAL;
1910
1911 switch (attr->attach_type) {
1912 case BPF_CGROUP_INET_INGRESS:
1913 case BPF_CGROUP_INET_EGRESS:
1914 ptype = BPF_PROG_TYPE_CGROUP_SKB;
1915 break;
1916 case BPF_CGROUP_INET_SOCK_CREATE:
1917 case BPF_CGROUP_INET4_POST_BIND:
1918 case BPF_CGROUP_INET6_POST_BIND:
1919 ptype = BPF_PROG_TYPE_CGROUP_SOCK;
1920 break;
1921 case BPF_CGROUP_INET4_BIND:
1922 case BPF_CGROUP_INET6_BIND:
1923 case BPF_CGROUP_INET4_CONNECT:
1924 case BPF_CGROUP_INET6_CONNECT:
1925 case BPF_CGROUP_UDP4_SENDMSG:
1926 case BPF_CGROUP_UDP6_SENDMSG:
1927 case BPF_CGROUP_UDP4_RECVMSG:
1928 case BPF_CGROUP_UDP6_RECVMSG:
1929 ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
1930 break;
1931 case BPF_CGROUP_SOCK_OPS:
1932 ptype = BPF_PROG_TYPE_SOCK_OPS;
1933 break;
1934 case BPF_CGROUP_DEVICE:
1935 ptype = BPF_PROG_TYPE_CGROUP_DEVICE;
1936 break;
1937 case BPF_SK_MSG_VERDICT:
1938 ptype = BPF_PROG_TYPE_SK_MSG;
1939 break;
1940 case BPF_SK_SKB_STREAM_PARSER:
1941 case BPF_SK_SKB_STREAM_VERDICT:
1942 ptype = BPF_PROG_TYPE_SK_SKB;
1943 break;
1944 case BPF_LIRC_MODE2:
1945 ptype = BPF_PROG_TYPE_LIRC_MODE2;
1946 break;
1947 case BPF_FLOW_DISSECTOR:
1948 ptype = BPF_PROG_TYPE_FLOW_DISSECTOR;
1949 break;
1950 case BPF_CGROUP_SYSCTL:
1951 ptype = BPF_PROG_TYPE_CGROUP_SYSCTL;
1952 break;
1953 case BPF_CGROUP_GETSOCKOPT:
1954 case BPF_CGROUP_SETSOCKOPT:
1955 ptype = BPF_PROG_TYPE_CGROUP_SOCKOPT;
1956 break;
1957 default:
1958 return -EINVAL;
1959 }
1960
1961 prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
1962 if (IS_ERR(prog))
1963 return PTR_ERR(prog);
1964
1965 if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) {
1966 bpf_prog_put(prog);
1967 return -EINVAL;
1968 }
1969
1970 switch (ptype) {
1971 case BPF_PROG_TYPE_SK_SKB:
1972 case BPF_PROG_TYPE_SK_MSG:
1973 ret = sock_map_get_from_fd(attr, prog);
1974 break;
1975 case BPF_PROG_TYPE_LIRC_MODE2:
1976 ret = lirc_prog_attach(attr, prog);
1977 break;
1978 case BPF_PROG_TYPE_FLOW_DISSECTOR:
1979 ret = skb_flow_dissector_bpf_prog_attach(attr, prog);
1980 break;
1981 default:
1982 ret = cgroup_bpf_prog_attach(attr, ptype, prog);
1983 }
1984
1985 if (ret)
1986 bpf_prog_put(prog);
1987 return ret;
1988}
1989
1990#define BPF_PROG_DETACH_LAST_FIELD attach_type
1991
1992static int bpf_prog_detach(const union bpf_attr *attr)
1993{
1994 enum bpf_prog_type ptype;
1995
1996 if (!capable(CAP_NET_ADMIN))
1997 return -EPERM;
1998
1999 if (CHECK_ATTR(BPF_PROG_DETACH))
2000 return -EINVAL;
2001
2002 switch (attr->attach_type) {
2003 case BPF_CGROUP_INET_INGRESS:
2004 case BPF_CGROUP_INET_EGRESS:
2005 ptype = BPF_PROG_TYPE_CGROUP_SKB;
2006 break;
2007 case BPF_CGROUP_INET_SOCK_CREATE:
2008 case BPF_CGROUP_INET4_POST_BIND:
2009 case BPF_CGROUP_INET6_POST_BIND:
2010 ptype = BPF_PROG_TYPE_CGROUP_SOCK;
2011 break;
2012 case BPF_CGROUP_INET4_BIND:
2013 case BPF_CGROUP_INET6_BIND:
2014 case BPF_CGROUP_INET4_CONNECT:
2015 case BPF_CGROUP_INET6_CONNECT:
2016 case BPF_CGROUP_UDP4_SENDMSG:
2017 case BPF_CGROUP_UDP6_SENDMSG:
2018 case BPF_CGROUP_UDP4_RECVMSG:
2019 case BPF_CGROUP_UDP6_RECVMSG:
2020 ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
2021 break;
2022 case BPF_CGROUP_SOCK_OPS:
2023 ptype = BPF_PROG_TYPE_SOCK_OPS;
2024 break;
2025 case BPF_CGROUP_DEVICE:
2026 ptype = BPF_PROG_TYPE_CGROUP_DEVICE;
2027 break;
2028 case BPF_SK_MSG_VERDICT:
2029 return sock_map_get_from_fd(attr, NULL);
2030 case BPF_SK_SKB_STREAM_PARSER:
2031 case BPF_SK_SKB_STREAM_VERDICT:
2032 return sock_map_get_from_fd(attr, NULL);
2033 case BPF_LIRC_MODE2:
2034 return lirc_prog_detach(attr);
2035 case BPF_FLOW_DISSECTOR:
2036 return skb_flow_dissector_bpf_prog_detach(attr);
2037 case BPF_CGROUP_SYSCTL:
2038 ptype = BPF_PROG_TYPE_CGROUP_SYSCTL;
2039 break;
2040 case BPF_CGROUP_GETSOCKOPT:
2041 case BPF_CGROUP_SETSOCKOPT:
2042 ptype = BPF_PROG_TYPE_CGROUP_SOCKOPT;
2043 break;
2044 default:
2045 return -EINVAL;
2046 }
2047
2048 return cgroup_bpf_prog_detach(attr, ptype);
2049}
2050
2051#define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt
2052
2053static int bpf_prog_query(const union bpf_attr *attr,
2054 union bpf_attr __user *uattr)
2055{
2056 if (!capable(CAP_NET_ADMIN))
2057 return -EPERM;
2058 if (CHECK_ATTR(BPF_PROG_QUERY))
2059 return -EINVAL;
2060 if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
2061 return -EINVAL;
2062
2063 switch (attr->query.attach_type) {
2064 case BPF_CGROUP_INET_INGRESS:
2065 case BPF_CGROUP_INET_EGRESS:
2066 case BPF_CGROUP_INET_SOCK_CREATE:
2067 case BPF_CGROUP_INET4_BIND:
2068 case BPF_CGROUP_INET6_BIND:
2069 case BPF_CGROUP_INET4_POST_BIND:
2070 case BPF_CGROUP_INET6_POST_BIND:
2071 case BPF_CGROUP_INET4_CONNECT:
2072 case BPF_CGROUP_INET6_CONNECT:
2073 case BPF_CGROUP_UDP4_SENDMSG:
2074 case BPF_CGROUP_UDP6_SENDMSG:
2075 case BPF_CGROUP_UDP4_RECVMSG:
2076 case BPF_CGROUP_UDP6_RECVMSG:
2077 case BPF_CGROUP_SOCK_OPS:
2078 case BPF_CGROUP_DEVICE:
2079 case BPF_CGROUP_SYSCTL:
2080 case BPF_CGROUP_GETSOCKOPT:
2081 case BPF_CGROUP_SETSOCKOPT:
2082 break;
2083 case BPF_LIRC_MODE2:
2084 return lirc_prog_query(attr, uattr);
2085 case BPF_FLOW_DISSECTOR:
2086 return skb_flow_dissector_prog_query(attr, uattr);
2087 default:
2088 return -EINVAL;
2089 }
2090
2091 return cgroup_bpf_prog_query(attr, uattr);
2092}
2093
2094#define BPF_PROG_TEST_RUN_LAST_FIELD test.ctx_out
2095
2096static int bpf_prog_test_run(const union bpf_attr *attr,
2097 union bpf_attr __user *uattr)
2098{
2099 struct bpf_prog *prog;
2100 int ret = -ENOTSUPP;
2101
2102 if (!capable(CAP_SYS_ADMIN))
2103 return -EPERM;
2104 if (CHECK_ATTR(BPF_PROG_TEST_RUN))
2105 return -EINVAL;
2106
2107 if ((attr->test.ctx_size_in && !attr->test.ctx_in) ||
2108 (!attr->test.ctx_size_in && attr->test.ctx_in))
2109 return -EINVAL;
2110
2111 if ((attr->test.ctx_size_out && !attr->test.ctx_out) ||
2112 (!attr->test.ctx_size_out && attr->test.ctx_out))
2113 return -EINVAL;
2114
2115 prog = bpf_prog_get(attr->test.prog_fd);
2116 if (IS_ERR(prog))
2117 return PTR_ERR(prog);
2118
2119 if (prog->aux->ops->test_run)
2120 ret = prog->aux->ops->test_run(prog, attr, uattr);
2121
2122 bpf_prog_put(prog);
2123 return ret;
2124}
2125
2126#define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
2127
2128static int bpf_obj_get_next_id(const union bpf_attr *attr,
2129 union bpf_attr __user *uattr,
2130 struct idr *idr,
2131 spinlock_t *lock)
2132{
2133 u32 next_id = attr->start_id;
2134 int err = 0;
2135
2136 if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
2137 return -EINVAL;
2138
2139 if (!capable(CAP_SYS_ADMIN))
2140 return -EPERM;
2141
2142 next_id++;
2143 spin_lock_bh(lock);
2144 if (!idr_get_next(idr, &next_id))
2145 err = -ENOENT;
2146 spin_unlock_bh(lock);
2147
2148 if (!err)
2149 err = put_user(next_id, &uattr->next_id);
2150
2151 return err;
2152}
2153
2154#define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
2155
2156static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
2157{
2158 struct bpf_prog *prog;
2159 u32 id = attr->prog_id;
2160 int fd;
2161
2162 if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
2163 return -EINVAL;
2164
2165 if (!capable(CAP_SYS_ADMIN))
2166 return -EPERM;
2167
2168 spin_lock_bh(&prog_idr_lock);
2169 prog = idr_find(&prog_idr, id);
2170 if (prog)
2171 prog = bpf_prog_inc_not_zero(prog);
2172 else
2173 prog = ERR_PTR(-ENOENT);
2174 spin_unlock_bh(&prog_idr_lock);
2175
2176 if (IS_ERR(prog))
2177 return PTR_ERR(prog);
2178
2179 fd = bpf_prog_new_fd(prog);
2180 if (fd < 0)
2181 bpf_prog_put(prog);
2182
2183 return fd;
2184}
2185
2186#define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
2187
2188static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
2189{
2190 struct bpf_map *map;
2191 u32 id = attr->map_id;
2192 int f_flags;
2193 int fd;
2194
2195 if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
2196 attr->open_flags & ~BPF_OBJ_FLAG_MASK)
2197 return -EINVAL;
2198
2199 if (!capable(CAP_SYS_ADMIN))
2200 return -EPERM;
2201
2202 f_flags = bpf_get_file_flag(attr->open_flags);
2203 if (f_flags < 0)
2204 return f_flags;
2205
2206 spin_lock_bh(&map_idr_lock);
2207 map = idr_find(&map_idr, id);
2208 if (map)
2209 map = __bpf_map_inc_not_zero(map, true);
2210 else
2211 map = ERR_PTR(-ENOENT);
2212 spin_unlock_bh(&map_idr_lock);
2213
2214 if (IS_ERR(map))
2215 return PTR_ERR(map);
2216
2217 fd = bpf_map_new_fd(map, f_flags);
2218 if (fd < 0)
2219 bpf_map_put_with_uref(map);
2220
2221 return fd;
2222}
2223
2224static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
2225 unsigned long addr, u32 *off,
2226 u32 *type)
2227{
2228 const struct bpf_map *map;
2229 int i;
2230
2231 for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {
2232 map = prog->aux->used_maps[i];
2233 if (map == (void *)addr) {
2234 *type = BPF_PSEUDO_MAP_FD;
2235 return map;
2236 }
2237 if (!map->ops->map_direct_value_meta)
2238 continue;
2239 if (!map->ops->map_direct_value_meta(map, addr, off)) {
2240 *type = BPF_PSEUDO_MAP_VALUE;
2241 return map;
2242 }
2243 }
2244
2245 return NULL;
2246}
2247
2248static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog)
2249{
2250 const struct bpf_map *map;
2251 struct bpf_insn *insns;
2252 u32 off, type;
2253 u64 imm;
2254 int i;
2255
2256 insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog),
2257 GFP_USER);
2258 if (!insns)
2259 return insns;
2260
2261 for (i = 0; i < prog->len; i++) {
2262 if (insns[i].code == (BPF_JMP | BPF_TAIL_CALL)) {
2263 insns[i].code = BPF_JMP | BPF_CALL;
2264 insns[i].imm = BPF_FUNC_tail_call;
2265 /* fall-through */
2266 }
2267 if (insns[i].code == (BPF_JMP | BPF_CALL) ||
2268 insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) {
2269 if (insns[i].code == (BPF_JMP | BPF_CALL_ARGS))
2270 insns[i].code = BPF_JMP | BPF_CALL;
2271 if (!bpf_dump_raw_ok())
2272 insns[i].imm = 0;
2273 continue;
2274 }
2275
2276 if (insns[i].code != (BPF_LD | BPF_IMM | BPF_DW))
2277 continue;
2278
2279 imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm;
2280 map = bpf_map_from_imm(prog, imm, &off, &type);
2281 if (map) {
2282 insns[i].src_reg = type;
2283 insns[i].imm = map->id;
2284 insns[i + 1].imm = off;
2285 continue;
2286 }
2287 }
2288
2289 return insns;
2290}
2291
2292static int set_info_rec_size(struct bpf_prog_info *info)
2293{
2294 /*
2295 * Ensure info.*_rec_size is the same as kernel expected size
2296 *
2297 * or
2298 *
2299 * Only allow zero *_rec_size if both _rec_size and _cnt are
2300 * zero. In this case, the kernel will set the expected
2301 * _rec_size back to the info.
2302 */
2303
2304 if ((info->nr_func_info || info->func_info_rec_size) &&
2305 info->func_info_rec_size != sizeof(struct bpf_func_info))
2306 return -EINVAL;
2307
2308 if ((info->nr_line_info || info->line_info_rec_size) &&
2309 info->line_info_rec_size != sizeof(struct bpf_line_info))
2310 return -EINVAL;
2311
2312 if ((info->nr_jited_line_info || info->jited_line_info_rec_size) &&
2313 info->jited_line_info_rec_size != sizeof(__u64))
2314 return -EINVAL;
2315
2316 info->func_info_rec_size = sizeof(struct bpf_func_info);
2317 info->line_info_rec_size = sizeof(struct bpf_line_info);
2318 info->jited_line_info_rec_size = sizeof(__u64);
2319
2320 return 0;
2321}
2322
2323static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
2324 const union bpf_attr *attr,
2325 union bpf_attr __user *uattr)
2326{
2327 struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
2328 struct bpf_prog_info info = {};
2329 u32 info_len = attr->info.info_len;
2330 struct bpf_prog_stats stats;
2331 char __user *uinsns;
2332 u32 ulen;
2333 int err;
2334
2335 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
2336 if (err)
2337 return err;
2338 info_len = min_t(u32, sizeof(info), info_len);
2339
2340 if (copy_from_user(&info, uinfo, info_len))
2341 return -EFAULT;
2342
2343 info.type = prog->type;
2344 info.id = prog->aux->id;
2345 info.load_time = prog->aux->load_time;
2346 info.created_by_uid = from_kuid_munged(current_user_ns(),
2347 prog->aux->user->uid);
2348 info.gpl_compatible = prog->gpl_compatible;
2349
2350 memcpy(info.tag, prog->tag, sizeof(prog->tag));
2351 memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
2352
2353 ulen = info.nr_map_ids;
2354 info.nr_map_ids = prog->aux->used_map_cnt;
2355 ulen = min_t(u32, info.nr_map_ids, ulen);
2356 if (ulen) {
2357 u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
2358 u32 i;
2359
2360 for (i = 0; i < ulen; i++)
2361 if (put_user(prog->aux->used_maps[i]->id,
2362 &user_map_ids[i]))
2363 return -EFAULT;
2364 }
2365
2366 err = set_info_rec_size(&info);
2367 if (err)
2368 return err;
2369
2370 bpf_prog_get_stats(prog, &stats);
2371 info.run_time_ns = stats.nsecs;
2372 info.run_cnt = stats.cnt;
2373
2374 if (!capable(CAP_SYS_ADMIN)) {
2375 info.jited_prog_len = 0;
2376 info.xlated_prog_len = 0;
2377 info.nr_jited_ksyms = 0;
2378 info.nr_jited_func_lens = 0;
2379 info.nr_func_info = 0;
2380 info.nr_line_info = 0;
2381 info.nr_jited_line_info = 0;
2382 goto done;
2383 }
2384
2385 ulen = info.xlated_prog_len;
2386 info.xlated_prog_len = bpf_prog_insn_size(prog);
2387 if (info.xlated_prog_len && ulen) {
2388 struct bpf_insn *insns_sanitized;
2389 bool fault;
2390
2391 if (prog->blinded && !bpf_dump_raw_ok()) {
2392 info.xlated_prog_insns = 0;
2393 goto done;
2394 }
2395 insns_sanitized = bpf_insn_prepare_dump(prog);
2396 if (!insns_sanitized)
2397 return -ENOMEM;
2398 uinsns = u64_to_user_ptr(info.xlated_prog_insns);
2399 ulen = min_t(u32, info.xlated_prog_len, ulen);
2400 fault = copy_to_user(uinsns, insns_sanitized, ulen);
2401 kfree(insns_sanitized);
2402 if (fault)
2403 return -EFAULT;
2404 }
2405
2406 if (bpf_prog_is_dev_bound(prog->aux)) {
2407 err = bpf_prog_offload_info_fill(&info, prog);
2408 if (err)
2409 return err;
2410 goto done;
2411 }
2412
2413 /* NOTE: the following code is supposed to be skipped for offload.
2414 * bpf_prog_offload_info_fill() is the place to fill similar fields
2415 * for offload.
2416 */
2417 ulen = info.jited_prog_len;
2418 if (prog->aux->func_cnt) {
2419 u32 i;
2420
2421 info.jited_prog_len = 0;
2422 for (i = 0; i < prog->aux->func_cnt; i++)
2423 info.jited_prog_len += prog->aux->func[i]->jited_len;
2424 } else {
2425 info.jited_prog_len = prog->jited_len;
2426 }
2427
2428 if (info.jited_prog_len && ulen) {
2429 if (bpf_dump_raw_ok()) {
2430 uinsns = u64_to_user_ptr(info.jited_prog_insns);
2431 ulen = min_t(u32, info.jited_prog_len, ulen);
2432
2433 /* for multi-function programs, copy the JITed
2434 * instructions for all the functions
2435 */
2436 if (prog->aux->func_cnt) {
2437 u32 len, free, i;
2438 u8 *img;
2439
2440 free = ulen;
2441 for (i = 0; i < prog->aux->func_cnt; i++) {
2442 len = prog->aux->func[i]->jited_len;
2443 len = min_t(u32, len, free);
2444 img = (u8 *) prog->aux->func[i]->bpf_func;
2445 if (copy_to_user(uinsns, img, len))
2446 return -EFAULT;
2447 uinsns += len;
2448 free -= len;
2449 if (!free)
2450 break;
2451 }
2452 } else {
2453 if (copy_to_user(uinsns, prog->bpf_func, ulen))
2454 return -EFAULT;
2455 }
2456 } else {
2457 info.jited_prog_insns = 0;
2458 }
2459 }
2460
2461 ulen = info.nr_jited_ksyms;
2462 info.nr_jited_ksyms = prog->aux->func_cnt ? : 1;
2463 if (ulen) {
2464 if (bpf_dump_raw_ok()) {
2465 unsigned long ksym_addr;
2466 u64 __user *user_ksyms;
2467 u32 i;
2468
2469 /* copy the address of the kernel symbol
2470 * corresponding to each function
2471 */
2472 ulen = min_t(u32, info.nr_jited_ksyms, ulen);
2473 user_ksyms = u64_to_user_ptr(info.jited_ksyms);
2474 if (prog->aux->func_cnt) {
2475 for (i = 0; i < ulen; i++) {
2476 ksym_addr = (unsigned long)
2477 prog->aux->func[i]->bpf_func;
2478 if (put_user((u64) ksym_addr,
2479 &user_ksyms[i]))
2480 return -EFAULT;
2481 }
2482 } else {
2483 ksym_addr = (unsigned long) prog->bpf_func;
2484 if (put_user((u64) ksym_addr, &user_ksyms[0]))
2485 return -EFAULT;
2486 }
2487 } else {
2488 info.jited_ksyms = 0;
2489 }
2490 }
2491
2492 ulen = info.nr_jited_func_lens;
2493 info.nr_jited_func_lens = prog->aux->func_cnt ? : 1;
2494 if (ulen) {
2495 if (bpf_dump_raw_ok()) {
2496 u32 __user *user_lens;
2497 u32 func_len, i;
2498
2499 /* copy the JITed image lengths for each function */
2500 ulen = min_t(u32, info.nr_jited_func_lens, ulen);
2501 user_lens = u64_to_user_ptr(info.jited_func_lens);
2502 if (prog->aux->func_cnt) {
2503 for (i = 0; i < ulen; i++) {
2504 func_len =
2505 prog->aux->func[i]->jited_len;
2506 if (put_user(func_len, &user_lens[i]))
2507 return -EFAULT;
2508 }
2509 } else {
2510 func_len = prog->jited_len;
2511 if (put_user(func_len, &user_lens[0]))
2512 return -EFAULT;
2513 }
2514 } else {
2515 info.jited_func_lens = 0;
2516 }
2517 }
2518
2519 if (prog->aux->btf)
2520 info.btf_id = btf_id(prog->aux->btf);
2521
2522 ulen = info.nr_func_info;
2523 info.nr_func_info = prog->aux->func_info_cnt;
2524 if (info.nr_func_info && ulen) {
2525 char __user *user_finfo;
2526
2527 user_finfo = u64_to_user_ptr(info.func_info);
2528 ulen = min_t(u32, info.nr_func_info, ulen);
2529 if (copy_to_user(user_finfo, prog->aux->func_info,
2530 info.func_info_rec_size * ulen))
2531 return -EFAULT;
2532 }
2533
2534 ulen = info.nr_line_info;
2535 info.nr_line_info = prog->aux->nr_linfo;
2536 if (info.nr_line_info && ulen) {
2537 __u8 __user *user_linfo;
2538
2539 user_linfo = u64_to_user_ptr(info.line_info);
2540 ulen = min_t(u32, info.nr_line_info, ulen);
2541 if (copy_to_user(user_linfo, prog->aux->linfo,
2542 info.line_info_rec_size * ulen))
2543 return -EFAULT;
2544 }
2545
2546 ulen = info.nr_jited_line_info;
2547 if (prog->aux->jited_linfo)
2548 info.nr_jited_line_info = prog->aux->nr_linfo;
2549 else
2550 info.nr_jited_line_info = 0;
2551 if (info.nr_jited_line_info && ulen) {
2552 if (bpf_dump_raw_ok()) {
2553 __u64 __user *user_linfo;
2554 u32 i;
2555
2556 user_linfo = u64_to_user_ptr(info.jited_line_info);
2557 ulen = min_t(u32, info.nr_jited_line_info, ulen);
2558 for (i = 0; i < ulen; i++) {
2559 if (put_user((__u64)(long)prog->aux->jited_linfo[i],
2560 &user_linfo[i]))
2561 return -EFAULT;
2562 }
2563 } else {
2564 info.jited_line_info = 0;
2565 }
2566 }
2567
2568 ulen = info.nr_prog_tags;
2569 info.nr_prog_tags = prog->aux->func_cnt ? : 1;
2570 if (ulen) {
2571 __u8 __user (*user_prog_tags)[BPF_TAG_SIZE];
2572 u32 i;
2573
2574 user_prog_tags = u64_to_user_ptr(info.prog_tags);
2575 ulen = min_t(u32, info.nr_prog_tags, ulen);
2576 if (prog->aux->func_cnt) {
2577 for (i = 0; i < ulen; i++) {
2578 if (copy_to_user(user_prog_tags[i],
2579 prog->aux->func[i]->tag,
2580 BPF_TAG_SIZE))
2581 return -EFAULT;
2582 }
2583 } else {
2584 if (copy_to_user(user_prog_tags[0],
2585 prog->tag, BPF_TAG_SIZE))
2586 return -EFAULT;
2587 }
2588 }
2589
2590done:
2591 if (copy_to_user(uinfo, &info, info_len) ||
2592 put_user(info_len, &uattr->info.info_len))
2593 return -EFAULT;
2594
2595 return 0;
2596}
2597
2598static int bpf_map_get_info_by_fd(struct bpf_map *map,
2599 const union bpf_attr *attr,
2600 union bpf_attr __user *uattr)
2601{
2602 struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
2603 struct bpf_map_info info = {};
2604 u32 info_len = attr->info.info_len;
2605 int err;
2606
2607 err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
2608 if (err)
2609 return err;
2610 info_len = min_t(u32, sizeof(info), info_len);
2611
2612 info.type = map->map_type;
2613 info.id = map->id;
2614 info.key_size = map->key_size;
2615 info.value_size = map->value_size;
2616 info.max_entries = map->max_entries;
2617 info.map_flags = map->map_flags;
2618 memcpy(info.name, map->name, sizeof(map->name));
2619
2620 if (map->btf) {
2621 info.btf_id = btf_id(map->btf);
2622 info.btf_key_type_id = map->btf_key_type_id;
2623 info.btf_value_type_id = map->btf_value_type_id;
2624 }
2625
2626 if (bpf_map_is_dev_bound(map)) {
2627 err = bpf_map_offload_info_fill(&info, map);
2628 if (err)
2629 return err;
2630 }
2631
2632 if (copy_to_user(uinfo, &info, info_len) ||
2633 put_user(info_len, &uattr->info.info_len))
2634 return -EFAULT;
2635
2636 return 0;
2637}
2638
2639static int bpf_btf_get_info_by_fd(struct btf *btf,
2640 const union bpf_attr *attr,
2641 union bpf_attr __user *uattr)
2642{
2643 struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info);
2644 u32 info_len = attr->info.info_len;
2645 int err;
2646
2647 err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len);
2648 if (err)
2649 return err;
2650
2651 return btf_get_info_by_fd(btf, attr, uattr);
2652}
2653
2654#define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
2655
2656static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
2657 union bpf_attr __user *uattr)
2658{
2659 int ufd = attr->info.bpf_fd;
2660 struct fd f;
2661 int err;
2662
2663 if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
2664 return -EINVAL;
2665
2666 f = fdget(ufd);
2667 if (!f.file)
2668 return -EBADFD;
2669
2670 if (f.file->f_op == &bpf_prog_fops)
2671 err = bpf_prog_get_info_by_fd(f.file->private_data, attr,
2672 uattr);
2673 else if (f.file->f_op == &bpf_map_fops)
2674 err = bpf_map_get_info_by_fd(f.file->private_data, attr,
2675 uattr);
2676 else if (f.file->f_op == &btf_fops)
2677 err = bpf_btf_get_info_by_fd(f.file->private_data, attr, uattr);
2678 else
2679 err = -EINVAL;
2680
2681 fdput(f);
2682 return err;
2683}
2684
2685#define BPF_BTF_LOAD_LAST_FIELD btf_log_level
2686
2687static int bpf_btf_load(const union bpf_attr *attr)
2688{
2689 if (CHECK_ATTR(BPF_BTF_LOAD))
2690 return -EINVAL;
2691
2692 if (!capable(CAP_SYS_ADMIN))
2693 return -EPERM;
2694
2695 return btf_new_fd(attr);
2696}
2697
2698#define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
2699
2700static int bpf_btf_get_fd_by_id(const union bpf_attr *attr)
2701{
2702 if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID))
2703 return -EINVAL;
2704
2705 if (!capable(CAP_SYS_ADMIN))
2706 return -EPERM;
2707
2708 return btf_get_fd_by_id(attr->btf_id);
2709}
2710
2711static int bpf_task_fd_query_copy(const union bpf_attr *attr,
2712 union bpf_attr __user *uattr,
2713 u32 prog_id, u32 fd_type,
2714 const char *buf, u64 probe_offset,
2715 u64 probe_addr)
2716{
2717 char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf);
2718 u32 len = buf ? strlen(buf) : 0, input_len;
2719 int err = 0;
2720
2721 if (put_user(len, &uattr->task_fd_query.buf_len))
2722 return -EFAULT;
2723 input_len = attr->task_fd_query.buf_len;
2724 if (input_len && ubuf) {
2725 if (!len) {
2726 /* nothing to copy, just make ubuf NULL terminated */
2727 char zero = '\0';
2728
2729 if (put_user(zero, ubuf))
2730 return -EFAULT;
2731 } else if (input_len >= len + 1) {
2732 /* ubuf can hold the string with NULL terminator */
2733 if (copy_to_user(ubuf, buf, len + 1))
2734 return -EFAULT;
2735 } else {
2736 /* ubuf cannot hold the string with NULL terminator,
2737 * do a partial copy with NULL terminator.
2738 */
2739 char zero = '\0';
2740
2741 err = -ENOSPC;
2742 if (copy_to_user(ubuf, buf, input_len - 1))
2743 return -EFAULT;
2744 if (put_user(zero, ubuf + input_len - 1))
2745 return -EFAULT;
2746 }
2747 }
2748
2749 if (put_user(prog_id, &uattr->task_fd_query.prog_id) ||
2750 put_user(fd_type, &uattr->task_fd_query.fd_type) ||
2751 put_user(probe_offset, &uattr->task_fd_query.probe_offset) ||
2752 put_user(probe_addr, &uattr->task_fd_query.probe_addr))
2753 return -EFAULT;
2754
2755 return err;
2756}
2757
2758#define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr
2759
2760static int bpf_task_fd_query(const union bpf_attr *attr,
2761 union bpf_attr __user *uattr)
2762{
2763 pid_t pid = attr->task_fd_query.pid;
2764 u32 fd = attr->task_fd_query.fd;
2765 const struct perf_event *event;
2766 struct files_struct *files;
2767 struct task_struct *task;
2768 struct file *file;
2769 int err;
2770
2771 if (CHECK_ATTR(BPF_TASK_FD_QUERY))
2772 return -EINVAL;
2773
2774 if (!capable(CAP_SYS_ADMIN))
2775 return -EPERM;
2776
2777 if (attr->task_fd_query.flags != 0)
2778 return -EINVAL;
2779
2780 task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
2781 if (!task)
2782 return -ENOENT;
2783
2784 files = get_files_struct(task);
2785 put_task_struct(task);
2786 if (!files)
2787 return -ENOENT;
2788
2789 err = 0;
2790 spin_lock(&files->file_lock);
2791 file = fcheck_files(files, fd);
2792 if (!file)
2793 err = -EBADF;
2794 else
2795 get_file(file);
2796 spin_unlock(&files->file_lock);
2797 put_files_struct(files);
2798
2799 if (err)
2800 goto out;
2801
2802 if (file->f_op == &bpf_raw_tp_fops) {
2803 struct bpf_raw_tracepoint *raw_tp = file->private_data;
2804 struct bpf_raw_event_map *btp = raw_tp->btp;
2805
2806 err = bpf_task_fd_query_copy(attr, uattr,
2807 raw_tp->prog->aux->id,
2808 BPF_FD_TYPE_RAW_TRACEPOINT,
2809 btp->tp->name, 0, 0);
2810 goto put_file;
2811 }
2812
2813 event = perf_get_event(file);
2814 if (!IS_ERR(event)) {
2815 u64 probe_offset, probe_addr;
2816 u32 prog_id, fd_type;
2817 const char *buf;
2818
2819 err = bpf_get_perf_event_info(event, &prog_id, &fd_type,
2820 &buf, &probe_offset,
2821 &probe_addr);
2822 if (!err)
2823 err = bpf_task_fd_query_copy(attr, uattr, prog_id,
2824 fd_type, buf,
2825 probe_offset,
2826 probe_addr);
2827 goto put_file;
2828 }
2829
2830 err = -ENOTSUPP;
2831put_file:
2832 fput(file);
2833out:
2834 return err;
2835}
2836
2837SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
2838{
2839 union bpf_attr attr = {};
2840 int err;
2841
2842 if (sysctl_unprivileged_bpf_disabled && !capable(CAP_SYS_ADMIN))
2843 return -EPERM;
2844
2845 err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size);
2846 if (err)
2847 return err;
2848 size = min_t(u32, size, sizeof(attr));
2849
2850 /* copy attributes from user space, may be less than sizeof(bpf_attr) */
2851 if (copy_from_user(&attr, uattr, size) != 0)
2852 return -EFAULT;
2853
2854 err = security_bpf(cmd, &attr, size);
2855 if (err < 0)
2856 return err;
2857
2858 switch (cmd) {
2859 case BPF_MAP_CREATE:
2860 err = map_create(&attr);
2861 break;
2862 case BPF_MAP_LOOKUP_ELEM:
2863 err = map_lookup_elem(&attr);
2864 break;
2865 case BPF_MAP_UPDATE_ELEM:
2866 err = map_update_elem(&attr);
2867 break;
2868 case BPF_MAP_DELETE_ELEM:
2869 err = map_delete_elem(&attr);
2870 break;
2871 case BPF_MAP_GET_NEXT_KEY:
2872 err = map_get_next_key(&attr);
2873 break;
2874 case BPF_MAP_FREEZE:
2875 err = map_freeze(&attr);
2876 break;
2877 case BPF_PROG_LOAD:
2878 err = bpf_prog_load(&attr, uattr);
2879 break;
2880 case BPF_OBJ_PIN:
2881 err = bpf_obj_pin(&attr);
2882 break;
2883 case BPF_OBJ_GET:
2884 err = bpf_obj_get(&attr);
2885 break;
2886 case BPF_PROG_ATTACH:
2887 err = bpf_prog_attach(&attr);
2888 break;
2889 case BPF_PROG_DETACH:
2890 err = bpf_prog_detach(&attr);
2891 break;
2892 case BPF_PROG_QUERY:
2893 err = bpf_prog_query(&attr, uattr);
2894 break;
2895 case BPF_PROG_TEST_RUN:
2896 err = bpf_prog_test_run(&attr, uattr);
2897 break;
2898 case BPF_PROG_GET_NEXT_ID:
2899 err = bpf_obj_get_next_id(&attr, uattr,
2900 &prog_idr, &prog_idr_lock);
2901 break;
2902 case BPF_MAP_GET_NEXT_ID:
2903 err = bpf_obj_get_next_id(&attr, uattr,
2904 &map_idr, &map_idr_lock);
2905 break;
2906 case BPF_BTF_GET_NEXT_ID:
2907 err = bpf_obj_get_next_id(&attr, uattr,
2908 &btf_idr, &btf_idr_lock);
2909 break;
2910 case BPF_PROG_GET_FD_BY_ID:
2911 err = bpf_prog_get_fd_by_id(&attr);
2912 break;
2913 case BPF_MAP_GET_FD_BY_ID:
2914 err = bpf_map_get_fd_by_id(&attr);
2915 break;
2916 case BPF_OBJ_GET_INFO_BY_FD:
2917 err = bpf_obj_get_info_by_fd(&attr, uattr);
2918 break;
2919 case BPF_RAW_TRACEPOINT_OPEN:
2920 err = bpf_raw_tracepoint_open(&attr);
2921 break;
2922 case BPF_BTF_LOAD:
2923 err = bpf_btf_load(&attr);
2924 break;
2925 case BPF_BTF_GET_FD_BY_ID:
2926 err = bpf_btf_get_fd_by_id(&attr);
2927 break;
2928 case BPF_TASK_FD_QUERY:
2929 err = bpf_task_fd_query(&attr, uattr);
2930 break;
2931 case BPF_MAP_LOOKUP_AND_DELETE_ELEM:
2932 err = map_lookup_and_delete_elem(&attr);
2933 break;
2934 default:
2935 err = -EINVAL;
2936 break;
2937 }
2938
2939 return err;
2940}