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1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
3#include <linux/capability.h>
4#include <stdlib.h>
5#include <test_progs.h>
6#include <bpf/btf.h>
7
8#include "autoconf_helper.h"
9#include "unpriv_helpers.h"
10#include "cap_helpers.h"
11
12#define str_has_pfx(str, pfx) \
13 (strncmp(str, pfx, __builtin_constant_p(pfx) ? sizeof(pfx) - 1 : strlen(pfx)) == 0)
14
15#define TEST_LOADER_LOG_BUF_SZ 2097152
16
17#define TEST_TAG_EXPECT_FAILURE "comment:test_expect_failure"
18#define TEST_TAG_EXPECT_SUCCESS "comment:test_expect_success"
19#define TEST_TAG_EXPECT_MSG_PFX "comment:test_expect_msg="
20#define TEST_TAG_EXPECT_FAILURE_UNPRIV "comment:test_expect_failure_unpriv"
21#define TEST_TAG_EXPECT_SUCCESS_UNPRIV "comment:test_expect_success_unpriv"
22#define TEST_TAG_EXPECT_MSG_PFX_UNPRIV "comment:test_expect_msg_unpriv="
23#define TEST_TAG_LOG_LEVEL_PFX "comment:test_log_level="
24#define TEST_TAG_PROG_FLAGS_PFX "comment:test_prog_flags="
25#define TEST_TAG_DESCRIPTION_PFX "comment:test_description="
26#define TEST_TAG_RETVAL_PFX "comment:test_retval="
27#define TEST_TAG_RETVAL_PFX_UNPRIV "comment:test_retval_unpriv="
28#define TEST_TAG_AUXILIARY "comment:test_auxiliary"
29#define TEST_TAG_AUXILIARY_UNPRIV "comment:test_auxiliary_unpriv"
30#define TEST_BTF_PATH "comment:test_btf_path="
31
32/* Warning: duplicated in bpf_misc.h */
33#define POINTER_VALUE 0xcafe4all
34#define TEST_DATA_LEN 64
35
36#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
37#define EFFICIENT_UNALIGNED_ACCESS 1
38#else
39#define EFFICIENT_UNALIGNED_ACCESS 0
40#endif
41
42static int sysctl_unpriv_disabled = -1;
43
44enum mode {
45 PRIV = 1,
46 UNPRIV = 2
47};
48
49struct test_subspec {
50 char *name;
51 bool expect_failure;
52 const char **expect_msgs;
53 size_t expect_msg_cnt;
54 int retval;
55 bool execute;
56};
57
58struct test_spec {
59 const char *prog_name;
60 struct test_subspec priv;
61 struct test_subspec unpriv;
62 const char *btf_custom_path;
63 int log_level;
64 int prog_flags;
65 int mode_mask;
66 bool auxiliary;
67 bool valid;
68};
69
70static int tester_init(struct test_loader *tester)
71{
72 if (!tester->log_buf) {
73 tester->log_buf_sz = TEST_LOADER_LOG_BUF_SZ;
74 tester->log_buf = calloc(tester->log_buf_sz, 1);
75 if (!ASSERT_OK_PTR(tester->log_buf, "tester_log_buf"))
76 return -ENOMEM;
77 }
78
79 return 0;
80}
81
82void test_loader_fini(struct test_loader *tester)
83{
84 if (!tester)
85 return;
86
87 free(tester->log_buf);
88}
89
90static void free_test_spec(struct test_spec *spec)
91{
92 free(spec->priv.name);
93 free(spec->unpriv.name);
94 free(spec->priv.expect_msgs);
95 free(spec->unpriv.expect_msgs);
96
97 spec->priv.name = NULL;
98 spec->unpriv.name = NULL;
99 spec->priv.expect_msgs = NULL;
100 spec->unpriv.expect_msgs = NULL;
101}
102
103static int push_msg(const char *msg, struct test_subspec *subspec)
104{
105 void *tmp;
106
107 tmp = realloc(subspec->expect_msgs, (1 + subspec->expect_msg_cnt) * sizeof(void *));
108 if (!tmp) {
109 ASSERT_FAIL("failed to realloc memory for messages\n");
110 return -ENOMEM;
111 }
112 subspec->expect_msgs = tmp;
113 subspec->expect_msgs[subspec->expect_msg_cnt++] = msg;
114
115 return 0;
116}
117
118static int parse_int(const char *str, int *val, const char *name)
119{
120 char *end;
121 long tmp;
122
123 errno = 0;
124 if (str_has_pfx(str, "0x"))
125 tmp = strtol(str + 2, &end, 16);
126 else
127 tmp = strtol(str, &end, 10);
128 if (errno || end[0] != '\0') {
129 PRINT_FAIL("failed to parse %s from '%s'\n", name, str);
130 return -EINVAL;
131 }
132 *val = tmp;
133 return 0;
134}
135
136static int parse_retval(const char *str, int *val, const char *name)
137{
138 struct {
139 char *name;
140 int val;
141 } named_values[] = {
142 { "INT_MIN" , INT_MIN },
143 { "POINTER_VALUE", POINTER_VALUE },
144 { "TEST_DATA_LEN", TEST_DATA_LEN },
145 };
146 int i;
147
148 for (i = 0; i < ARRAY_SIZE(named_values); ++i) {
149 if (strcmp(str, named_values[i].name) != 0)
150 continue;
151 *val = named_values[i].val;
152 return 0;
153 }
154
155 return parse_int(str, val, name);
156}
157
158static void update_flags(int *flags, int flag, bool clear)
159{
160 if (clear)
161 *flags &= ~flag;
162 else
163 *flags |= flag;
164}
165
166/* Uses btf_decl_tag attributes to describe the expected test
167 * behavior, see bpf_misc.h for detailed description of each attribute
168 * and attribute combinations.
169 */
170static int parse_test_spec(struct test_loader *tester,
171 struct bpf_object *obj,
172 struct bpf_program *prog,
173 struct test_spec *spec)
174{
175 const char *description = NULL;
176 bool has_unpriv_result = false;
177 bool has_unpriv_retval = false;
178 int func_id, i, err = 0;
179 struct btf *btf;
180
181 memset(spec, 0, sizeof(*spec));
182
183 spec->prog_name = bpf_program__name(prog);
184 spec->prog_flags = BPF_F_TEST_REG_INVARIANTS; /* by default be strict */
185
186 btf = bpf_object__btf(obj);
187 if (!btf) {
188 ASSERT_FAIL("BPF object has no BTF");
189 return -EINVAL;
190 }
191
192 func_id = btf__find_by_name_kind(btf, spec->prog_name, BTF_KIND_FUNC);
193 if (func_id < 0) {
194 ASSERT_FAIL("failed to find FUNC BTF type for '%s'", spec->prog_name);
195 return -EINVAL;
196 }
197
198 for (i = 1; i < btf__type_cnt(btf); i++) {
199 const char *s, *val, *msg;
200 const struct btf_type *t;
201 bool clear;
202 int flags;
203
204 t = btf__type_by_id(btf, i);
205 if (!btf_is_decl_tag(t))
206 continue;
207
208 if (t->type != func_id || btf_decl_tag(t)->component_idx != -1)
209 continue;
210
211 s = btf__str_by_offset(btf, t->name_off);
212 if (str_has_pfx(s, TEST_TAG_DESCRIPTION_PFX)) {
213 description = s + sizeof(TEST_TAG_DESCRIPTION_PFX) - 1;
214 } else if (strcmp(s, TEST_TAG_EXPECT_FAILURE) == 0) {
215 spec->priv.expect_failure = true;
216 spec->mode_mask |= PRIV;
217 } else if (strcmp(s, TEST_TAG_EXPECT_SUCCESS) == 0) {
218 spec->priv.expect_failure = false;
219 spec->mode_mask |= PRIV;
220 } else if (strcmp(s, TEST_TAG_EXPECT_FAILURE_UNPRIV) == 0) {
221 spec->unpriv.expect_failure = true;
222 spec->mode_mask |= UNPRIV;
223 has_unpriv_result = true;
224 } else if (strcmp(s, TEST_TAG_EXPECT_SUCCESS_UNPRIV) == 0) {
225 spec->unpriv.expect_failure = false;
226 spec->mode_mask |= UNPRIV;
227 has_unpriv_result = true;
228 } else if (strcmp(s, TEST_TAG_AUXILIARY) == 0) {
229 spec->auxiliary = true;
230 spec->mode_mask |= PRIV;
231 } else if (strcmp(s, TEST_TAG_AUXILIARY_UNPRIV) == 0) {
232 spec->auxiliary = true;
233 spec->mode_mask |= UNPRIV;
234 } else if (str_has_pfx(s, TEST_TAG_EXPECT_MSG_PFX)) {
235 msg = s + sizeof(TEST_TAG_EXPECT_MSG_PFX) - 1;
236 err = push_msg(msg, &spec->priv);
237 if (err)
238 goto cleanup;
239 spec->mode_mask |= PRIV;
240 } else if (str_has_pfx(s, TEST_TAG_EXPECT_MSG_PFX_UNPRIV)) {
241 msg = s + sizeof(TEST_TAG_EXPECT_MSG_PFX_UNPRIV) - 1;
242 err = push_msg(msg, &spec->unpriv);
243 if (err)
244 goto cleanup;
245 spec->mode_mask |= UNPRIV;
246 } else if (str_has_pfx(s, TEST_TAG_RETVAL_PFX)) {
247 val = s + sizeof(TEST_TAG_RETVAL_PFX) - 1;
248 err = parse_retval(val, &spec->priv.retval, "__retval");
249 if (err)
250 goto cleanup;
251 spec->priv.execute = true;
252 spec->mode_mask |= PRIV;
253 } else if (str_has_pfx(s, TEST_TAG_RETVAL_PFX_UNPRIV)) {
254 val = s + sizeof(TEST_TAG_RETVAL_PFX_UNPRIV) - 1;
255 err = parse_retval(val, &spec->unpriv.retval, "__retval_unpriv");
256 if (err)
257 goto cleanup;
258 spec->mode_mask |= UNPRIV;
259 spec->unpriv.execute = true;
260 has_unpriv_retval = true;
261 } else if (str_has_pfx(s, TEST_TAG_LOG_LEVEL_PFX)) {
262 val = s + sizeof(TEST_TAG_LOG_LEVEL_PFX) - 1;
263 err = parse_int(val, &spec->log_level, "test log level");
264 if (err)
265 goto cleanup;
266 } else if (str_has_pfx(s, TEST_TAG_PROG_FLAGS_PFX)) {
267 val = s + sizeof(TEST_TAG_PROG_FLAGS_PFX) - 1;
268
269 clear = val[0] == '!';
270 if (clear)
271 val++;
272
273 if (strcmp(val, "BPF_F_STRICT_ALIGNMENT") == 0) {
274 update_flags(&spec->prog_flags, BPF_F_STRICT_ALIGNMENT, clear);
275 } else if (strcmp(val, "BPF_F_ANY_ALIGNMENT") == 0) {
276 update_flags(&spec->prog_flags, BPF_F_ANY_ALIGNMENT, clear);
277 } else if (strcmp(val, "BPF_F_TEST_RND_HI32") == 0) {
278 update_flags(&spec->prog_flags, BPF_F_TEST_RND_HI32, clear);
279 } else if (strcmp(val, "BPF_F_TEST_STATE_FREQ") == 0) {
280 update_flags(&spec->prog_flags, BPF_F_TEST_STATE_FREQ, clear);
281 } else if (strcmp(val, "BPF_F_SLEEPABLE") == 0) {
282 update_flags(&spec->prog_flags, BPF_F_SLEEPABLE, clear);
283 } else if (strcmp(val, "BPF_F_XDP_HAS_FRAGS") == 0) {
284 update_flags(&spec->prog_flags, BPF_F_XDP_HAS_FRAGS, clear);
285 } else if (strcmp(val, "BPF_F_TEST_REG_INVARIANTS") == 0) {
286 update_flags(&spec->prog_flags, BPF_F_TEST_REG_INVARIANTS, clear);
287 } else /* assume numeric value */ {
288 err = parse_int(val, &flags, "test prog flags");
289 if (err)
290 goto cleanup;
291 update_flags(&spec->prog_flags, flags, clear);
292 }
293 } else if (str_has_pfx(s, TEST_BTF_PATH)) {
294 spec->btf_custom_path = s + sizeof(TEST_BTF_PATH) - 1;
295 }
296 }
297
298 if (spec->mode_mask == 0)
299 spec->mode_mask = PRIV;
300
301 if (!description)
302 description = spec->prog_name;
303
304 if (spec->mode_mask & PRIV) {
305 spec->priv.name = strdup(description);
306 if (!spec->priv.name) {
307 PRINT_FAIL("failed to allocate memory for priv.name\n");
308 err = -ENOMEM;
309 goto cleanup;
310 }
311 }
312
313 if (spec->mode_mask & UNPRIV) {
314 int descr_len = strlen(description);
315 const char *suffix = " @unpriv";
316 char *name;
317
318 name = malloc(descr_len + strlen(suffix) + 1);
319 if (!name) {
320 PRINT_FAIL("failed to allocate memory for unpriv.name\n");
321 err = -ENOMEM;
322 goto cleanup;
323 }
324
325 strcpy(name, description);
326 strcpy(&name[descr_len], suffix);
327 spec->unpriv.name = name;
328 }
329
330 if (spec->mode_mask & (PRIV | UNPRIV)) {
331 if (!has_unpriv_result)
332 spec->unpriv.expect_failure = spec->priv.expect_failure;
333
334 if (!has_unpriv_retval) {
335 spec->unpriv.retval = spec->priv.retval;
336 spec->unpriv.execute = spec->priv.execute;
337 }
338
339 if (!spec->unpriv.expect_msgs) {
340 size_t sz = spec->priv.expect_msg_cnt * sizeof(void *);
341
342 spec->unpriv.expect_msgs = malloc(sz);
343 if (!spec->unpriv.expect_msgs) {
344 PRINT_FAIL("failed to allocate memory for unpriv.expect_msgs\n");
345 err = -ENOMEM;
346 goto cleanup;
347 }
348 memcpy(spec->unpriv.expect_msgs, spec->priv.expect_msgs, sz);
349 spec->unpriv.expect_msg_cnt = spec->priv.expect_msg_cnt;
350 }
351 }
352
353 spec->valid = true;
354
355 return 0;
356
357cleanup:
358 free_test_spec(spec);
359 return err;
360}
361
362static void prepare_case(struct test_loader *tester,
363 struct test_spec *spec,
364 struct bpf_object *obj,
365 struct bpf_program *prog)
366{
367 int min_log_level = 0, prog_flags;
368
369 if (env.verbosity > VERBOSE_NONE)
370 min_log_level = 1;
371 if (env.verbosity > VERBOSE_VERY)
372 min_log_level = 2;
373
374 bpf_program__set_log_buf(prog, tester->log_buf, tester->log_buf_sz);
375
376 /* Make sure we set at least minimal log level, unless test requires
377 * even higher level already. Make sure to preserve independent log
378 * level 4 (verifier stats), though.
379 */
380 if ((spec->log_level & 3) < min_log_level)
381 bpf_program__set_log_level(prog, (spec->log_level & 4) | min_log_level);
382 else
383 bpf_program__set_log_level(prog, spec->log_level);
384
385 prog_flags = bpf_program__flags(prog);
386 bpf_program__set_flags(prog, prog_flags | spec->prog_flags);
387
388 tester->log_buf[0] = '\0';
389 tester->next_match_pos = 0;
390}
391
392static void emit_verifier_log(const char *log_buf, bool force)
393{
394 if (!force && env.verbosity == VERBOSE_NONE)
395 return;
396 fprintf(stdout, "VERIFIER LOG:\n=============\n%s=============\n", log_buf);
397}
398
399static void validate_case(struct test_loader *tester,
400 struct test_subspec *subspec,
401 struct bpf_object *obj,
402 struct bpf_program *prog,
403 int load_err)
404{
405 int i, j;
406
407 for (i = 0; i < subspec->expect_msg_cnt; i++) {
408 char *match;
409 const char *expect_msg;
410
411 expect_msg = subspec->expect_msgs[i];
412
413 match = strstr(tester->log_buf + tester->next_match_pos, expect_msg);
414 if (!ASSERT_OK_PTR(match, "expect_msg")) {
415 /* if we are in verbose mode, we've already emitted log */
416 if (env.verbosity == VERBOSE_NONE)
417 emit_verifier_log(tester->log_buf, true /*force*/);
418 for (j = 0; j < i; j++)
419 fprintf(stderr,
420 "MATCHED MSG: '%s'\n", subspec->expect_msgs[j]);
421 fprintf(stderr, "EXPECTED MSG: '%s'\n", expect_msg);
422 return;
423 }
424
425 tester->next_match_pos = match - tester->log_buf + strlen(expect_msg);
426 }
427}
428
429struct cap_state {
430 __u64 old_caps;
431 bool initialized;
432};
433
434static int drop_capabilities(struct cap_state *caps)
435{
436 const __u64 caps_to_drop = (1ULL << CAP_SYS_ADMIN | 1ULL << CAP_NET_ADMIN |
437 1ULL << CAP_PERFMON | 1ULL << CAP_BPF);
438 int err;
439
440 err = cap_disable_effective(caps_to_drop, &caps->old_caps);
441 if (err) {
442 PRINT_FAIL("failed to drop capabilities: %i, %s\n", err, strerror(err));
443 return err;
444 }
445
446 caps->initialized = true;
447 return 0;
448}
449
450static int restore_capabilities(struct cap_state *caps)
451{
452 int err;
453
454 if (!caps->initialized)
455 return 0;
456
457 err = cap_enable_effective(caps->old_caps, NULL);
458 if (err)
459 PRINT_FAIL("failed to restore capabilities: %i, %s\n", err, strerror(err));
460 caps->initialized = false;
461 return err;
462}
463
464static bool can_execute_unpriv(struct test_loader *tester, struct test_spec *spec)
465{
466 if (sysctl_unpriv_disabled < 0)
467 sysctl_unpriv_disabled = get_unpriv_disabled() ? 1 : 0;
468 if (sysctl_unpriv_disabled)
469 return false;
470 if ((spec->prog_flags & BPF_F_ANY_ALIGNMENT) && !EFFICIENT_UNALIGNED_ACCESS)
471 return false;
472 return true;
473}
474
475static bool is_unpriv_capable_map(struct bpf_map *map)
476{
477 enum bpf_map_type type;
478 __u32 flags;
479
480 type = bpf_map__type(map);
481
482 switch (type) {
483 case BPF_MAP_TYPE_HASH:
484 case BPF_MAP_TYPE_PERCPU_HASH:
485 case BPF_MAP_TYPE_HASH_OF_MAPS:
486 flags = bpf_map__map_flags(map);
487 return !(flags & BPF_F_ZERO_SEED);
488 case BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE:
489 case BPF_MAP_TYPE_ARRAY:
490 case BPF_MAP_TYPE_RINGBUF:
491 case BPF_MAP_TYPE_PROG_ARRAY:
492 case BPF_MAP_TYPE_CGROUP_ARRAY:
493 case BPF_MAP_TYPE_PERCPU_ARRAY:
494 case BPF_MAP_TYPE_USER_RINGBUF:
495 case BPF_MAP_TYPE_ARRAY_OF_MAPS:
496 case BPF_MAP_TYPE_CGROUP_STORAGE:
497 case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
498 return true;
499 default:
500 return false;
501 }
502}
503
504static int do_prog_test_run(int fd_prog, int *retval)
505{
506 __u8 tmp_out[TEST_DATA_LEN << 2] = {};
507 __u8 tmp_in[TEST_DATA_LEN] = {};
508 int err, saved_errno;
509 LIBBPF_OPTS(bpf_test_run_opts, topts,
510 .data_in = tmp_in,
511 .data_size_in = sizeof(tmp_in),
512 .data_out = tmp_out,
513 .data_size_out = sizeof(tmp_out),
514 .repeat = 1,
515 );
516
517 err = bpf_prog_test_run_opts(fd_prog, &topts);
518 saved_errno = errno;
519
520 if (err) {
521 PRINT_FAIL("FAIL: Unexpected bpf_prog_test_run error: %d (%s) ",
522 saved_errno, strerror(saved_errno));
523 return err;
524 }
525
526 ASSERT_OK(0, "bpf_prog_test_run");
527 *retval = topts.retval;
528
529 return 0;
530}
531
532static bool should_do_test_run(struct test_spec *spec, struct test_subspec *subspec)
533{
534 if (!subspec->execute)
535 return false;
536
537 if (subspec->expect_failure)
538 return false;
539
540 if ((spec->prog_flags & BPF_F_ANY_ALIGNMENT) && !EFFICIENT_UNALIGNED_ACCESS) {
541 if (env.verbosity != VERBOSE_NONE)
542 printf("alignment prevents execution\n");
543 return false;
544 }
545
546 return true;
547}
548
549/* this function is forced noinline and has short generic name to look better
550 * in test_progs output (in case of a failure)
551 */
552static noinline
553void run_subtest(struct test_loader *tester,
554 struct bpf_object_open_opts *open_opts,
555 const void *obj_bytes,
556 size_t obj_byte_cnt,
557 struct test_spec *specs,
558 struct test_spec *spec,
559 bool unpriv)
560{
561 struct test_subspec *subspec = unpriv ? &spec->unpriv : &spec->priv;
562 struct bpf_program *tprog = NULL, *tprog_iter;
563 struct test_spec *spec_iter;
564 struct cap_state caps = {};
565 struct bpf_object *tobj;
566 struct bpf_map *map;
567 int retval, err, i;
568 bool should_load;
569
570 if (!test__start_subtest(subspec->name))
571 return;
572
573 if (unpriv) {
574 if (!can_execute_unpriv(tester, spec)) {
575 test__skip();
576 test__end_subtest();
577 return;
578 }
579 if (drop_capabilities(&caps)) {
580 test__end_subtest();
581 return;
582 }
583 }
584
585 /* Implicitly reset to NULL if next test case doesn't specify */
586 open_opts->btf_custom_path = spec->btf_custom_path;
587
588 tobj = bpf_object__open_mem(obj_bytes, obj_byte_cnt, open_opts);
589 if (!ASSERT_OK_PTR(tobj, "obj_open_mem")) /* shouldn't happen */
590 goto subtest_cleanup;
591
592 i = 0;
593 bpf_object__for_each_program(tprog_iter, tobj) {
594 spec_iter = &specs[i++];
595 should_load = false;
596
597 if (spec_iter->valid) {
598 if (strcmp(bpf_program__name(tprog_iter), spec->prog_name) == 0) {
599 tprog = tprog_iter;
600 should_load = true;
601 }
602
603 if (spec_iter->auxiliary &&
604 spec_iter->mode_mask & (unpriv ? UNPRIV : PRIV))
605 should_load = true;
606 }
607
608 bpf_program__set_autoload(tprog_iter, should_load);
609 }
610
611 prepare_case(tester, spec, tobj, tprog);
612
613 /* By default bpf_object__load() automatically creates all
614 * maps declared in the skeleton. Some map types are only
615 * allowed in priv mode. Disable autoload for such maps in
616 * unpriv mode.
617 */
618 bpf_object__for_each_map(map, tobj)
619 bpf_map__set_autocreate(map, !unpriv || is_unpriv_capable_map(map));
620
621 err = bpf_object__load(tobj);
622 if (subspec->expect_failure) {
623 if (!ASSERT_ERR(err, "unexpected_load_success")) {
624 emit_verifier_log(tester->log_buf, false /*force*/);
625 goto tobj_cleanup;
626 }
627 } else {
628 if (!ASSERT_OK(err, "unexpected_load_failure")) {
629 emit_verifier_log(tester->log_buf, true /*force*/);
630 goto tobj_cleanup;
631 }
632 }
633
634 emit_verifier_log(tester->log_buf, false /*force*/);
635 validate_case(tester, subspec, tobj, tprog, err);
636
637 if (should_do_test_run(spec, subspec)) {
638 /* For some reason test_verifier executes programs
639 * with all capabilities restored. Do the same here.
640 */
641 if (restore_capabilities(&caps))
642 goto tobj_cleanup;
643
644 if (tester->pre_execution_cb) {
645 err = tester->pre_execution_cb(tobj);
646 if (err) {
647 PRINT_FAIL("pre_execution_cb failed: %d\n", err);
648 goto tobj_cleanup;
649 }
650 }
651
652 do_prog_test_run(bpf_program__fd(tprog), &retval);
653 if (retval != subspec->retval && subspec->retval != POINTER_VALUE) {
654 PRINT_FAIL("Unexpected retval: %d != %d\n", retval, subspec->retval);
655 goto tobj_cleanup;
656 }
657 }
658
659tobj_cleanup:
660 bpf_object__close(tobj);
661subtest_cleanup:
662 test__end_subtest();
663 restore_capabilities(&caps);
664}
665
666static void process_subtest(struct test_loader *tester,
667 const char *skel_name,
668 skel_elf_bytes_fn elf_bytes_factory)
669{
670 LIBBPF_OPTS(bpf_object_open_opts, open_opts, .object_name = skel_name);
671 struct test_spec *specs = NULL;
672 struct bpf_object *obj = NULL;
673 struct bpf_program *prog;
674 const void *obj_bytes;
675 int err, i, nr_progs;
676 size_t obj_byte_cnt;
677
678 if (tester_init(tester) < 0)
679 return; /* failed to initialize tester */
680
681 obj_bytes = elf_bytes_factory(&obj_byte_cnt);
682 obj = bpf_object__open_mem(obj_bytes, obj_byte_cnt, &open_opts);
683 if (!ASSERT_OK_PTR(obj, "obj_open_mem"))
684 return;
685
686 nr_progs = 0;
687 bpf_object__for_each_program(prog, obj)
688 ++nr_progs;
689
690 specs = calloc(nr_progs, sizeof(struct test_spec));
691 if (!ASSERT_OK_PTR(specs, "Can't alloc specs array"))
692 return;
693
694 i = 0;
695 bpf_object__for_each_program(prog, obj) {
696 /* ignore tests for which we can't derive test specification */
697 err = parse_test_spec(tester, obj, prog, &specs[i++]);
698 if (err)
699 PRINT_FAIL("Can't parse test spec for program '%s'\n",
700 bpf_program__name(prog));
701 }
702
703 i = 0;
704 bpf_object__for_each_program(prog, obj) {
705 struct test_spec *spec = &specs[i++];
706
707 if (!spec->valid || spec->auxiliary)
708 continue;
709
710 if (spec->mode_mask & PRIV)
711 run_subtest(tester, &open_opts, obj_bytes, obj_byte_cnt,
712 specs, spec, false);
713 if (spec->mode_mask & UNPRIV)
714 run_subtest(tester, &open_opts, obj_bytes, obj_byte_cnt,
715 specs, spec, true);
716
717 }
718
719 for (i = 0; i < nr_progs; ++i)
720 free_test_spec(&specs[i]);
721 free(specs);
722 bpf_object__close(obj);
723}
724
725void test_loader__run_subtests(struct test_loader *tester,
726 const char *skel_name,
727 skel_elf_bytes_fn elf_bytes_factory)
728{
729 /* see comment in run_subtest() for why we do this function nesting */
730 process_subtest(tester, skel_name, elf_bytes_factory);
731}