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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __MM_KASAN_KASAN_H
3#define __MM_KASAN_KASAN_H
4
5#include <linux/kasan.h>
6#include <linux/stackdepot.h>
7
8#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
9#define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1)
10
11#define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */
12#define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */
13#define KASAN_TAG_MAX 0xFD /* maximum value for random tags */
14
15#ifdef CONFIG_KASAN_GENERIC
16#define KASAN_FREE_PAGE 0xFF /* page was freed */
17#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
18#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
19#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
20#else
21#define KASAN_FREE_PAGE KASAN_TAG_INVALID
22#define KASAN_PAGE_REDZONE KASAN_TAG_INVALID
23#define KASAN_KMALLOC_REDZONE KASAN_TAG_INVALID
24#define KASAN_KMALLOC_FREE KASAN_TAG_INVALID
25#endif
26
27#define KASAN_GLOBAL_REDZONE 0xFA /* redzone for global variable */
28
29/*
30 * Stack redzone shadow values
31 * (Those are compiler's ABI, don't change them)
32 */
33#define KASAN_STACK_LEFT 0xF1
34#define KASAN_STACK_MID 0xF2
35#define KASAN_STACK_RIGHT 0xF3
36#define KASAN_STACK_PARTIAL 0xF4
37
38/*
39 * alloca redzone shadow values
40 */
41#define KASAN_ALLOCA_LEFT 0xCA
42#define KASAN_ALLOCA_RIGHT 0xCB
43
44#define KASAN_ALLOCA_REDZONE_SIZE 32
45
46/*
47 * Stack frame marker (compiler ABI).
48 */
49#define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3
50
51/* Don't break randconfig/all*config builds */
52#ifndef KASAN_ABI_VERSION
53#define KASAN_ABI_VERSION 1
54#endif
55
56struct kasan_access_info {
57 const void *access_addr;
58 const void *first_bad_addr;
59 size_t access_size;
60 bool is_write;
61 unsigned long ip;
62};
63
64/* The layout of struct dictated by compiler */
65struct kasan_source_location {
66 const char *filename;
67 int line_no;
68 int column_no;
69};
70
71/* The layout of struct dictated by compiler */
72struct kasan_global {
73 const void *beg; /* Address of the beginning of the global variable. */
74 size_t size; /* Size of the global variable. */
75 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
76 const void *name;
77 const void *module_name; /* Name of the module where the global variable is declared. */
78 unsigned long has_dynamic_init; /* This needed for C++ */
79#if KASAN_ABI_VERSION >= 4
80 struct kasan_source_location *location;
81#endif
82#if KASAN_ABI_VERSION >= 5
83 char *odr_indicator;
84#endif
85};
86
87/**
88 * Structures to keep alloc and free tracks *
89 */
90
91#define KASAN_STACK_DEPTH 64
92
93struct kasan_track {
94 u32 pid;
95 depot_stack_handle_t stack;
96};
97
98#ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY
99#define KASAN_NR_FREE_STACKS 5
100#else
101#define KASAN_NR_FREE_STACKS 1
102#endif
103
104struct kasan_alloc_meta {
105 struct kasan_track alloc_track;
106 struct kasan_track free_track[KASAN_NR_FREE_STACKS];
107#ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY
108 u8 free_pointer_tag[KASAN_NR_FREE_STACKS];
109 u8 free_track_idx;
110#endif
111};
112
113struct qlist_node {
114 struct qlist_node *next;
115};
116struct kasan_free_meta {
117 /* This field is used while the object is in the quarantine.
118 * Otherwise it might be used for the allocator freelist.
119 */
120 struct qlist_node quarantine_link;
121};
122
123struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
124 const void *object);
125struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
126 const void *object);
127
128static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
129{
130 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
131 << KASAN_SHADOW_SCALE_SHIFT);
132}
133
134static inline bool addr_has_shadow(const void *addr)
135{
136 return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
137}
138
139void kasan_poison_shadow(const void *address, size_t size, u8 value);
140
141/**
142 * check_memory_region - Check memory region, and report if invalid access.
143 * @addr: the accessed address
144 * @size: the accessed size
145 * @write: true if access is a write access
146 * @ret_ip: return address
147 * @return: true if access was valid, false if invalid
148 */
149bool check_memory_region(unsigned long addr, size_t size, bool write,
150 unsigned long ret_ip);
151
152void *find_first_bad_addr(void *addr, size_t size);
153const char *get_bug_type(struct kasan_access_info *info);
154
155void kasan_report(unsigned long addr, size_t size,
156 bool is_write, unsigned long ip);
157void kasan_report_invalid_free(void *object, unsigned long ip);
158
159struct page *kasan_addr_to_page(const void *addr);
160
161#if defined(CONFIG_KASAN_GENERIC) && \
162 (defined(CONFIG_SLAB) || defined(CONFIG_SLUB))
163void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
164void quarantine_reduce(void);
165void quarantine_remove_cache(struct kmem_cache *cache);
166#else
167static inline void quarantine_put(struct kasan_free_meta *info,
168 struct kmem_cache *cache) { }
169static inline void quarantine_reduce(void) { }
170static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
171#endif
172
173#ifdef CONFIG_KASAN_SW_TAGS
174
175void print_tags(u8 addr_tag, const void *addr);
176
177u8 random_tag(void);
178
179#else
180
181static inline void print_tags(u8 addr_tag, const void *addr) { }
182
183static inline u8 random_tag(void)
184{
185 return 0;
186}
187
188#endif
189
190#ifndef arch_kasan_set_tag
191static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
192{
193 return addr;
194}
195#endif
196#ifndef arch_kasan_reset_tag
197#define arch_kasan_reset_tag(addr) ((void *)(addr))
198#endif
199#ifndef arch_kasan_get_tag
200#define arch_kasan_get_tag(addr) 0
201#endif
202
203#define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag)))
204#define reset_tag(addr) ((void *)arch_kasan_reset_tag(addr))
205#define get_tag(addr) arch_kasan_get_tag(addr)
206
207/*
208 * Exported functions for interfaces called from assembly or from generated
209 * code. Declarations here to avoid warning about missing declarations.
210 */
211asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
212void __asan_register_globals(struct kasan_global *globals, size_t size);
213void __asan_unregister_globals(struct kasan_global *globals, size_t size);
214void __asan_loadN(unsigned long addr, size_t size);
215void __asan_storeN(unsigned long addr, size_t size);
216void __asan_handle_no_return(void);
217void __asan_alloca_poison(unsigned long addr, size_t size);
218void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom);
219
220void __asan_load1(unsigned long addr);
221void __asan_store1(unsigned long addr);
222void __asan_load2(unsigned long addr);
223void __asan_store2(unsigned long addr);
224void __asan_load4(unsigned long addr);
225void __asan_store4(unsigned long addr);
226void __asan_load8(unsigned long addr);
227void __asan_store8(unsigned long addr);
228void __asan_load16(unsigned long addr);
229void __asan_store16(unsigned long addr);
230
231void __asan_load1_noabort(unsigned long addr);
232void __asan_store1_noabort(unsigned long addr);
233void __asan_load2_noabort(unsigned long addr);
234void __asan_store2_noabort(unsigned long addr);
235void __asan_load4_noabort(unsigned long addr);
236void __asan_store4_noabort(unsigned long addr);
237void __asan_load8_noabort(unsigned long addr);
238void __asan_store8_noabort(unsigned long addr);
239void __asan_load16_noabort(unsigned long addr);
240void __asan_store16_noabort(unsigned long addr);
241
242void __asan_set_shadow_00(const void *addr, size_t size);
243void __asan_set_shadow_f1(const void *addr, size_t size);
244void __asan_set_shadow_f2(const void *addr, size_t size);
245void __asan_set_shadow_f3(const void *addr, size_t size);
246void __asan_set_shadow_f5(const void *addr, size_t size);
247void __asan_set_shadow_f8(const void *addr, size_t size);
248
249#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __MM_KASAN_KASAN_H
3#define __MM_KASAN_KASAN_H
4
5#include <linux/kasan.h>
6#include <linux/kfence.h>
7#include <linux/stackdepot.h>
8
9#ifdef CONFIG_KASAN_HW_TAGS
10
11#include <linux/static_key.h>
12#include "../slab.h"
13
14DECLARE_STATIC_KEY_FALSE(kasan_flag_stacktrace);
15extern bool kasan_flag_async __ro_after_init;
16
17static inline bool kasan_stack_collection_enabled(void)
18{
19 return static_branch_unlikely(&kasan_flag_stacktrace);
20}
21
22static inline bool kasan_async_mode_enabled(void)
23{
24 return kasan_flag_async;
25}
26#else
27
28static inline bool kasan_stack_collection_enabled(void)
29{
30 return true;
31}
32
33static inline bool kasan_async_mode_enabled(void)
34{
35 return false;
36}
37
38#endif
39
40extern bool kasan_flag_panic __ro_after_init;
41extern bool kasan_flag_async __ro_after_init;
42
43#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
44#define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
45#else
46#include <asm/mte-kasan.h>
47#define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE
48#endif
49
50#define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1)
51
52#define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT)
53
54#define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */
55#define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */
56#define KASAN_TAG_MAX 0xFD /* maximum value for random tags */
57
58#ifdef CONFIG_KASAN_HW_TAGS
59#define KASAN_TAG_MIN 0xF0 /* minimum value for random tags */
60#else
61#define KASAN_TAG_MIN 0x00 /* minimum value for random tags */
62#endif
63
64#ifdef CONFIG_KASAN_GENERIC
65#define KASAN_FREE_PAGE 0xFF /* page was freed */
66#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
67#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
68#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
69#define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */
70#else
71#define KASAN_FREE_PAGE KASAN_TAG_INVALID
72#define KASAN_PAGE_REDZONE KASAN_TAG_INVALID
73#define KASAN_KMALLOC_REDZONE KASAN_TAG_INVALID
74#define KASAN_KMALLOC_FREE KASAN_TAG_INVALID
75#define KASAN_KMALLOC_FREETRACK KASAN_TAG_INVALID
76#endif
77
78#define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */
79#define KASAN_VMALLOC_INVALID 0xF8 /* unallocated space in vmapped page */
80
81/*
82 * Stack redzone shadow values
83 * (Those are compiler's ABI, don't change them)
84 */
85#define KASAN_STACK_LEFT 0xF1
86#define KASAN_STACK_MID 0xF2
87#define KASAN_STACK_RIGHT 0xF3
88#define KASAN_STACK_PARTIAL 0xF4
89
90/*
91 * alloca redzone shadow values
92 */
93#define KASAN_ALLOCA_LEFT 0xCA
94#define KASAN_ALLOCA_RIGHT 0xCB
95
96#define KASAN_ALLOCA_REDZONE_SIZE 32
97
98/*
99 * Stack frame marker (compiler ABI).
100 */
101#define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3
102
103/* Don't break randconfig/all*config builds */
104#ifndef KASAN_ABI_VERSION
105#define KASAN_ABI_VERSION 1
106#endif
107
108/* Metadata layout customization. */
109#define META_BYTES_PER_BLOCK 1
110#define META_BLOCKS_PER_ROW 16
111#define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK)
112#define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE)
113#define META_ROWS_AROUND_ADDR 2
114
115struct kasan_access_info {
116 const void *access_addr;
117 const void *first_bad_addr;
118 size_t access_size;
119 bool is_write;
120 unsigned long ip;
121};
122
123/* The layout of struct dictated by compiler */
124struct kasan_source_location {
125 const char *filename;
126 int line_no;
127 int column_no;
128};
129
130/* The layout of struct dictated by compiler */
131struct kasan_global {
132 const void *beg; /* Address of the beginning of the global variable. */
133 size_t size; /* Size of the global variable. */
134 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
135 const void *name;
136 const void *module_name; /* Name of the module where the global variable is declared. */
137 unsigned long has_dynamic_init; /* This needed for C++ */
138#if KASAN_ABI_VERSION >= 4
139 struct kasan_source_location *location;
140#endif
141#if KASAN_ABI_VERSION >= 5
142 char *odr_indicator;
143#endif
144};
145
146/**
147 * Structures to keep alloc and free tracks *
148 */
149
150#define KASAN_STACK_DEPTH 64
151
152struct kasan_track {
153 u32 pid;
154 depot_stack_handle_t stack;
155};
156
157#if defined(CONFIG_KASAN_TAGS_IDENTIFY) && defined(CONFIG_KASAN_SW_TAGS)
158#define KASAN_NR_FREE_STACKS 5
159#else
160#define KASAN_NR_FREE_STACKS 1
161#endif
162
163struct kasan_alloc_meta {
164 struct kasan_track alloc_track;
165#ifdef CONFIG_KASAN_GENERIC
166 /*
167 * The auxiliary stack is stored into struct kasan_alloc_meta.
168 * The free stack is stored into struct kasan_free_meta.
169 */
170 depot_stack_handle_t aux_stack[2];
171#else
172 struct kasan_track free_track[KASAN_NR_FREE_STACKS];
173#endif
174#ifdef CONFIG_KASAN_TAGS_IDENTIFY
175 u8 free_pointer_tag[KASAN_NR_FREE_STACKS];
176 u8 free_track_idx;
177#endif
178};
179
180struct qlist_node {
181 struct qlist_node *next;
182};
183
184/*
185 * Generic mode either stores free meta in the object itself or in the redzone
186 * after the object. In the former case free meta offset is 0, in the latter
187 * case it has some sane value smaller than INT_MAX. Use INT_MAX as free meta
188 * offset when free meta isn't present.
189 */
190#define KASAN_NO_FREE_META INT_MAX
191
192struct kasan_free_meta {
193#ifdef CONFIG_KASAN_GENERIC
194 /* This field is used while the object is in the quarantine.
195 * Otherwise it might be used for the allocator freelist.
196 */
197 struct qlist_node quarantine_link;
198 struct kasan_track free_track;
199#endif
200};
201
202struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
203 const void *object);
204#ifdef CONFIG_KASAN_GENERIC
205struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
206 const void *object);
207#endif
208
209#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
210
211static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
212{
213 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
214 << KASAN_SHADOW_SCALE_SHIFT);
215}
216
217static inline bool addr_has_metadata(const void *addr)
218{
219 return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
220}
221
222/**
223 * kasan_check_range - Check memory region, and report if invalid access.
224 * @addr: the accessed address
225 * @size: the accessed size
226 * @write: true if access is a write access
227 * @ret_ip: return address
228 * @return: true if access was valid, false if invalid
229 */
230bool kasan_check_range(unsigned long addr, size_t size, bool write,
231 unsigned long ret_ip);
232
233#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
234
235static inline bool addr_has_metadata(const void *addr)
236{
237 return (is_vmalloc_addr(addr) || virt_addr_valid(addr));
238}
239
240#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
241
242#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
243void kasan_print_tags(u8 addr_tag, const void *addr);
244#else
245static inline void kasan_print_tags(u8 addr_tag, const void *addr) { }
246#endif
247
248void *kasan_find_first_bad_addr(void *addr, size_t size);
249const char *kasan_get_bug_type(struct kasan_access_info *info);
250void kasan_metadata_fetch_row(char *buffer, void *row);
251
252#if defined(CONFIG_KASAN_GENERIC) && defined(CONFIG_KASAN_STACK)
253void kasan_print_address_stack_frame(const void *addr);
254#else
255static inline void kasan_print_address_stack_frame(const void *addr) { }
256#endif
257
258bool kasan_report(unsigned long addr, size_t size,
259 bool is_write, unsigned long ip);
260void kasan_report_invalid_free(void *object, unsigned long ip);
261
262struct page *kasan_addr_to_page(const void *addr);
263
264depot_stack_handle_t kasan_save_stack(gfp_t flags);
265void kasan_set_track(struct kasan_track *track, gfp_t flags);
266void kasan_set_free_info(struct kmem_cache *cache, void *object, u8 tag);
267struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
268 void *object, u8 tag);
269
270#if defined(CONFIG_KASAN_GENERIC) && \
271 (defined(CONFIG_SLAB) || defined(CONFIG_SLUB))
272bool kasan_quarantine_put(struct kmem_cache *cache, void *object);
273void kasan_quarantine_reduce(void);
274void kasan_quarantine_remove_cache(struct kmem_cache *cache);
275#else
276static inline bool kasan_quarantine_put(struct kmem_cache *cache, void *object) { return false; }
277static inline void kasan_quarantine_reduce(void) { }
278static inline void kasan_quarantine_remove_cache(struct kmem_cache *cache) { }
279#endif
280
281#ifndef arch_kasan_set_tag
282static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
283{
284 return addr;
285}
286#endif
287#ifndef arch_kasan_get_tag
288#define arch_kasan_get_tag(addr) 0
289#endif
290
291#define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag)))
292#define get_tag(addr) arch_kasan_get_tag(addr)
293
294#ifdef CONFIG_KASAN_HW_TAGS
295
296#ifndef arch_enable_tagging_sync
297#define arch_enable_tagging_sync()
298#endif
299#ifndef arch_enable_tagging_async
300#define arch_enable_tagging_async()
301#endif
302#ifndef arch_init_tags
303#define arch_init_tags(max_tag)
304#endif
305#ifndef arch_set_tagging_report_once
306#define arch_set_tagging_report_once(state)
307#endif
308#ifndef arch_force_async_tag_fault
309#define arch_force_async_tag_fault()
310#endif
311#ifndef arch_get_random_tag
312#define arch_get_random_tag() (0xFF)
313#endif
314#ifndef arch_get_mem_tag
315#define arch_get_mem_tag(addr) (0xFF)
316#endif
317#ifndef arch_set_mem_tag_range
318#define arch_set_mem_tag_range(addr, size, tag, init) ((void *)(addr))
319#endif
320
321#define hw_enable_tagging_sync() arch_enable_tagging_sync()
322#define hw_enable_tagging_async() arch_enable_tagging_async()
323#define hw_init_tags(max_tag) arch_init_tags(max_tag)
324#define hw_set_tagging_report_once(state) arch_set_tagging_report_once(state)
325#define hw_force_async_tag_fault() arch_force_async_tag_fault()
326#define hw_get_random_tag() arch_get_random_tag()
327#define hw_get_mem_tag(addr) arch_get_mem_tag(addr)
328#define hw_set_mem_tag_range(addr, size, tag, init) \
329 arch_set_mem_tag_range((addr), (size), (tag), (init))
330
331#else /* CONFIG_KASAN_HW_TAGS */
332
333#define hw_enable_tagging_sync()
334#define hw_enable_tagging_async()
335#define hw_set_tagging_report_once(state)
336
337#endif /* CONFIG_KASAN_HW_TAGS */
338
339#if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
340
341void kasan_set_tagging_report_once(bool state);
342void kasan_enable_tagging_sync(void);
343void kasan_force_async_fault(void);
344
345#else /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */
346
347static inline void kasan_set_tagging_report_once(bool state) { }
348static inline void kasan_enable_tagging_sync(void) { }
349static inline void kasan_force_async_fault(void) { }
350
351#endif /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */
352
353#ifdef CONFIG_KASAN_SW_TAGS
354u8 kasan_random_tag(void);
355#elif defined(CONFIG_KASAN_HW_TAGS)
356static inline u8 kasan_random_tag(void) { return hw_get_random_tag(); }
357#else
358static inline u8 kasan_random_tag(void) { return 0; }
359#endif
360
361#ifdef CONFIG_KASAN_HW_TAGS
362
363static inline void kasan_poison(const void *addr, size_t size, u8 value, bool init)
364{
365 addr = kasan_reset_tag(addr);
366
367 /* Skip KFENCE memory if called explicitly outside of sl*b. */
368 if (is_kfence_address(addr))
369 return;
370
371 if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
372 return;
373 if (WARN_ON(size & KASAN_GRANULE_MASK))
374 return;
375
376 hw_set_mem_tag_range((void *)addr, size, value, init);
377}
378
379static inline void kasan_unpoison(const void *addr, size_t size, bool init)
380{
381 u8 tag = get_tag(addr);
382
383 addr = kasan_reset_tag(addr);
384
385 /* Skip KFENCE memory if called explicitly outside of sl*b. */
386 if (is_kfence_address(addr))
387 return;
388
389 if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
390 return;
391 /*
392 * Explicitly initialize the memory with the precise object size to
393 * avoid overwriting the SLAB redzone. This disables initialization in
394 * the arch code and may thus lead to performance penalty. The penalty
395 * is accepted since SLAB redzones aren't enabled in production builds.
396 */
397 if (__slub_debug_enabled() &&
398 init && ((unsigned long)size & KASAN_GRANULE_MASK)) {
399 init = false;
400 memzero_explicit((void *)addr, size);
401 }
402 size = round_up(size, KASAN_GRANULE_SIZE);
403
404 hw_set_mem_tag_range((void *)addr, size, tag, init);
405}
406
407static inline bool kasan_byte_accessible(const void *addr)
408{
409 u8 ptr_tag = get_tag(addr);
410 u8 mem_tag = hw_get_mem_tag((void *)addr);
411
412 return ptr_tag == KASAN_TAG_KERNEL || ptr_tag == mem_tag;
413}
414
415#else /* CONFIG_KASAN_HW_TAGS */
416
417/**
418 * kasan_poison - mark the memory range as inaccessible
419 * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
420 * @size - range size, must be aligned to KASAN_GRANULE_SIZE
421 * @value - value that's written to metadata for the range
422 * @init - whether to initialize the memory range (only for hardware tag-based)
423 *
424 * The size gets aligned to KASAN_GRANULE_SIZE before marking the range.
425 */
426void kasan_poison(const void *addr, size_t size, u8 value, bool init);
427
428/**
429 * kasan_unpoison - mark the memory range as accessible
430 * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
431 * @size - range size, can be unaligned
432 * @init - whether to initialize the memory range (only for hardware tag-based)
433 *
434 * For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before
435 * marking the range.
436 * For the generic mode, the last granule of the memory range gets partially
437 * unpoisoned based on the @size.
438 */
439void kasan_unpoison(const void *addr, size_t size, bool init);
440
441bool kasan_byte_accessible(const void *addr);
442
443#endif /* CONFIG_KASAN_HW_TAGS */
444
445#ifdef CONFIG_KASAN_GENERIC
446
447/**
448 * kasan_poison_last_granule - mark the last granule of the memory range as
449 * inaccessible
450 * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
451 * @size - range size
452 *
453 * This function is only available for the generic mode, as it's the only mode
454 * that has partially poisoned memory granules.
455 */
456void kasan_poison_last_granule(const void *address, size_t size);
457
458#else /* CONFIG_KASAN_GENERIC */
459
460static inline void kasan_poison_last_granule(const void *address, size_t size) { }
461
462#endif /* CONFIG_KASAN_GENERIC */
463
464#ifndef kasan_arch_is_ready
465static inline bool kasan_arch_is_ready(void) { return true; }
466#elif !defined(CONFIG_KASAN_GENERIC) || !defined(CONFIG_KASAN_OUTLINE)
467#error kasan_arch_is_ready only works in KASAN generic outline mode!
468#endif
469
470/*
471 * Exported functions for interfaces called from assembly or from generated
472 * code. Declarations here to avoid warning about missing declarations.
473 */
474asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
475void __asan_register_globals(struct kasan_global *globals, size_t size);
476void __asan_unregister_globals(struct kasan_global *globals, size_t size);
477void __asan_handle_no_return(void);
478void __asan_alloca_poison(unsigned long addr, size_t size);
479void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom);
480
481void __asan_load1(unsigned long addr);
482void __asan_store1(unsigned long addr);
483void __asan_load2(unsigned long addr);
484void __asan_store2(unsigned long addr);
485void __asan_load4(unsigned long addr);
486void __asan_store4(unsigned long addr);
487void __asan_load8(unsigned long addr);
488void __asan_store8(unsigned long addr);
489void __asan_load16(unsigned long addr);
490void __asan_store16(unsigned long addr);
491void __asan_loadN(unsigned long addr, size_t size);
492void __asan_storeN(unsigned long addr, size_t size);
493
494void __asan_load1_noabort(unsigned long addr);
495void __asan_store1_noabort(unsigned long addr);
496void __asan_load2_noabort(unsigned long addr);
497void __asan_store2_noabort(unsigned long addr);
498void __asan_load4_noabort(unsigned long addr);
499void __asan_store4_noabort(unsigned long addr);
500void __asan_load8_noabort(unsigned long addr);
501void __asan_store8_noabort(unsigned long addr);
502void __asan_load16_noabort(unsigned long addr);
503void __asan_store16_noabort(unsigned long addr);
504void __asan_loadN_noabort(unsigned long addr, size_t size);
505void __asan_storeN_noabort(unsigned long addr, size_t size);
506
507void __asan_report_load1_noabort(unsigned long addr);
508void __asan_report_store1_noabort(unsigned long addr);
509void __asan_report_load2_noabort(unsigned long addr);
510void __asan_report_store2_noabort(unsigned long addr);
511void __asan_report_load4_noabort(unsigned long addr);
512void __asan_report_store4_noabort(unsigned long addr);
513void __asan_report_load8_noabort(unsigned long addr);
514void __asan_report_store8_noabort(unsigned long addr);
515void __asan_report_load16_noabort(unsigned long addr);
516void __asan_report_store16_noabort(unsigned long addr);
517void __asan_report_load_n_noabort(unsigned long addr, size_t size);
518void __asan_report_store_n_noabort(unsigned long addr, size_t size);
519
520void __asan_set_shadow_00(const void *addr, size_t size);
521void __asan_set_shadow_f1(const void *addr, size_t size);
522void __asan_set_shadow_f2(const void *addr, size_t size);
523void __asan_set_shadow_f3(const void *addr, size_t size);
524void __asan_set_shadow_f5(const void *addr, size_t size);
525void __asan_set_shadow_f8(const void *addr, size_t size);
526
527void __hwasan_load1_noabort(unsigned long addr);
528void __hwasan_store1_noabort(unsigned long addr);
529void __hwasan_load2_noabort(unsigned long addr);
530void __hwasan_store2_noabort(unsigned long addr);
531void __hwasan_load4_noabort(unsigned long addr);
532void __hwasan_store4_noabort(unsigned long addr);
533void __hwasan_load8_noabort(unsigned long addr);
534void __hwasan_store8_noabort(unsigned long addr);
535void __hwasan_load16_noabort(unsigned long addr);
536void __hwasan_store16_noabort(unsigned long addr);
537void __hwasan_loadN_noabort(unsigned long addr, size_t size);
538void __hwasan_storeN_noabort(unsigned long addr, size_t size);
539
540void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size);
541
542#endif