1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Test cases for KMSAN.
4 * For each test case checks the presence (or absence) of generated reports.
5 * Relies on 'console' tracepoint to capture reports as they appear in the
6 * kernel log.
7 *
8 * Copyright (C) 2021-2022, Google LLC.
9 * Author: Alexander Potapenko <glider@google.com>
10 *
11 */
12
13 #include <kunit/test.h>
14 #include "kmsan.h"
15
16 #include <linux/jiffies.h>
17 #include <linux/kernel.h>
18 #include <linux/kmsan.h>
19 #include <linux/mm.h>
20 #include <linux/random.h>
21 #include <linux/slab.h>
22 #include <linux/spinlock.h>
23 #include <linux/string.h>
24 #include <linux/tracepoint.h>
25 #include <linux/vmalloc.h>
26 #include <trace/events/printk.h>
27
28 static DEFINE_PER_CPU(int, per_cpu_var);
29
30 /* Report as observed from console. */
31 static struct {
32 spinlock_t lock;
33 bool available;
34 bool ignore; /* Stop console output collection. */
35 char header[256];
36 } observed = {
37 .lock = __SPIN_LOCK_UNLOCKED(observed.lock),
38 };
39
40 /* Probe for console output: obtains observed lines of interest. */
41 static void probe_console(void *ignore, const char *buf, size_t len)
42 {
43 unsigned long flags;
44
45 if (observed.ignore)
46 return;
47 spin_lock_irqsave(&observed.lock, flags);
48
49 if (strnstr(buf, "BUG: KMSAN: ", len)) {
50 /*
51 * KMSAN report and related to the test.
52 *
53 * The provided @buf is not NUL-terminated; copy no more than
54 * @len bytes and let strscpy() add the missing NUL-terminator.
55 */
56 strscpy(observed.header, buf,
57 min(len + 1, sizeof(observed.header)));
58 WRITE_ONCE(observed.available, true);
59 observed.ignore = true;
60 }
61 spin_unlock_irqrestore(&observed.lock, flags);
62 }
63
64 /* Check if a report related to the test exists. */
65 static bool report_available(void)
66 {
67 return READ_ONCE(observed.available);
68 }
69
70 /* Reset observed.available, so that the test can trigger another report. */
71 static void report_reset(void)
72 {
73 unsigned long flags;
74
75 spin_lock_irqsave(&observed.lock, flags);
76 WRITE_ONCE(observed.available, false);
77 observed.ignore = false;
78 spin_unlock_irqrestore(&observed.lock, flags);
79 }
80
81 /* Information we expect in a report. */
82 struct expect_report {
83 const char *error_type; /* Error type. */
84 /*
85 * Kernel symbol from the error header, or NULL if no report is
86 * expected.
87 */
88 const char *symbol;
89 };
90
91 /* Check observed report matches information in @r. */
92 static bool report_matches(const struct expect_report *r)
93 {
94 typeof(observed.header) expected_header;
95 unsigned long flags;
96 bool ret = false;
97 const char *end;
98 char *cur;
99
100 /* Doubled-checked locking. */
101 if (!report_available() || !r->symbol)
102 return (!report_available() && !r->symbol);
103
104 /* Generate expected report contents. */
105
106 /* Title */
107 cur = expected_header;
108 end = &expected_header[sizeof(expected_header) - 1];
109
110 cur += scnprintf(cur, end - cur, "BUG: KMSAN: %s", r->error_type);
111
112 scnprintf(cur, end - cur, " in %s", r->symbol);
113 /* The exact offset won't match, remove it; also strip module name. */
114 cur = strchr(expected_header, '+');
115 if (cur)
116 *cur = '\0';
117
118 spin_lock_irqsave(&observed.lock, flags);
119 if (!report_available())
120 goto out; /* A new report is being captured. */
121
122 /* Finally match expected output to what we actually observed. */
123 ret = strstr(observed.header, expected_header);
124 out:
125 spin_unlock_irqrestore(&observed.lock, flags);
126
127 return ret;
128 }
129
130 /* ===== Test cases ===== */
131
132 /* Prevent replacing branch with select in LLVM. */
133 static noinline void check_true(char *arg)
134 {
135 pr_info("%s is true\n", arg);
136 }
137
138 static noinline void check_false(char *arg)
139 {
140 pr_info("%s is false\n", arg);
141 }
142
143 #define USE(x) \
144 do { \
145 if (x) \
146 check_true(#x); \
147 else \
148 check_false(#x); \
149 } while (0)
150
151 #define EXPECTATION_ETYPE_FN(e, reason, fn) \
152 struct expect_report e = { \
153 .error_type = reason, \
154 .symbol = fn, \
155 }
156
157 #define EXPECTATION_NO_REPORT(e) EXPECTATION_ETYPE_FN(e, NULL, NULL)
158 #define EXPECTATION_UNINIT_VALUE_FN(e, fn) \
159 EXPECTATION_ETYPE_FN(e, "uninit-value", fn)
160 #define EXPECTATION_UNINIT_VALUE(e) EXPECTATION_UNINIT_VALUE_FN(e, __func__)
161 #define EXPECTATION_USE_AFTER_FREE(e) \
162 EXPECTATION_ETYPE_FN(e, "use-after-free", __func__)
163
164 /* Test case: ensure that kmalloc() returns uninitialized memory. */
165 static void test_uninit_kmalloc(struct kunit *test)
166 {
167 EXPECTATION_UNINIT_VALUE(expect);
168 int *ptr;
169
170 kunit_info(test, "uninitialized kmalloc test (UMR report)\n");
171 ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
172 USE(*ptr);
173 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
174 }
175
176 /*
177 * Test case: ensure that kmalloc'ed memory becomes initialized after memset().
178 */
179 static void test_init_kmalloc(struct kunit *test)
180 {
181 EXPECTATION_NO_REPORT(expect);
182 int *ptr;
183
184 kunit_info(test, "initialized kmalloc test (no reports)\n");
185 ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
186 memset(ptr, 0, sizeof(*ptr));
187 USE(*ptr);
188 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
189 }
190
191 /* Test case: ensure that kzalloc() returns initialized memory. */
192 static void test_init_kzalloc(struct kunit *test)
193 {
194 EXPECTATION_NO_REPORT(expect);
195 int *ptr;
196
197 kunit_info(test, "initialized kzalloc test (no reports)\n");
198 ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
199 USE(*ptr);
200 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
201 }
202
203 /* Test case: ensure that local variables are uninitialized by default. */
204 static void test_uninit_stack_var(struct kunit *test)
205 {
206 EXPECTATION_UNINIT_VALUE(expect);
207 volatile int cond;
208
209 kunit_info(test, "uninitialized stack variable (UMR report)\n");
210 USE(cond);
211 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
212 }
213
214 /* Test case: ensure that local variables with initializers are initialized. */
215 static void test_init_stack_var(struct kunit *test)
216 {
217 EXPECTATION_NO_REPORT(expect);
218 volatile int cond = 1;
219
220 kunit_info(test, "initialized stack variable (no reports)\n");
221 USE(cond);
222 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
223 }
224
225 static noinline void two_param_fn_2(int arg1, int arg2)
226 {
227 USE(arg1);
228 USE(arg2);
229 }
230
231 static noinline void one_param_fn(int arg)
232 {
233 two_param_fn_2(arg, arg);
234 USE(arg);
235 }
236
237 static noinline void two_param_fn(int arg1, int arg2)
238 {
239 int init = 0;
240
241 one_param_fn(init);
242 USE(arg1);
243 USE(arg2);
244 }
245
246 static void test_params(struct kunit *test)
247 {
248 #ifdef CONFIG_KMSAN_CHECK_PARAM_RETVAL
249 /*
250 * With eager param/retval checking enabled, KMSAN will report an error
251 * before the call to two_param_fn().
252 */
253 EXPECTATION_UNINIT_VALUE_FN(expect, "test_params");
254 #else
255 EXPECTATION_UNINIT_VALUE_FN(expect, "two_param_fn");
256 #endif
257 volatile int uninit, init = 1;
258
259 kunit_info(test,
260 "uninit passed through a function parameter (UMR report)\n");
261 two_param_fn(uninit, init);
262 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
263 }
264
265 static int signed_sum3(int a, int b, int c)
266 {
267 return a + b + c;
268 }
269
270 /*
271 * Test case: ensure that uninitialized values are tracked through function
272 * arguments.
273 */
274 static void test_uninit_multiple_params(struct kunit *test)
275 {
276 EXPECTATION_UNINIT_VALUE(expect);
277 volatile char b = 3, c;
278 volatile int a;
279
280 kunit_info(test, "uninitialized local passed to fn (UMR report)\n");
281 USE(signed_sum3(a, b, c));
282 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
283 }
284
285 /* Helper function to make an array uninitialized. */
286 static noinline void do_uninit_local_array(char *array, int start, int stop)
287 {
288 volatile char uninit;
289
290 for (int i = start; i < stop; i++)
291 array[i] = uninit;
292 }
293
294 /*
295 * Test case: ensure kmsan_check_memory() reports an error when checking
296 * uninitialized memory.
297 */
298 static void test_uninit_kmsan_check_memory(struct kunit *test)
299 {
300 EXPECTATION_UNINIT_VALUE_FN(expect, "test_uninit_kmsan_check_memory");
301 volatile char local_array[8];
302
303 kunit_info(
304 test,
305 "kmsan_check_memory() called on uninit local (UMR report)\n");
306 do_uninit_local_array((char *)local_array, 5, 7);
307
308 kmsan_check_memory((char *)local_array, 8);
309 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
310 }
311
312 /*
313 * Test case: check that a virtual memory range created with vmap() from
314 * initialized pages is still considered as initialized.
315 */
316 static void test_init_kmsan_vmap_vunmap(struct kunit *test)
317 {
318 EXPECTATION_NO_REPORT(expect);
319 const int npages = 2;
320 struct page **pages;
321 void *vbuf;
322
323 kunit_info(test, "pages initialized via vmap (no reports)\n");
324
325 pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL);
326 for (int i = 0; i < npages; i++)
327 pages[i] = alloc_page(GFP_KERNEL);
328 vbuf = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
329 memset(vbuf, 0xfe, npages * PAGE_SIZE);
330 for (int i = 0; i < npages; i++)
331 kmsan_check_memory(page_address(pages[i]), PAGE_SIZE);
332
333 if (vbuf)
334 vunmap(vbuf);
335 for (int i = 0; i < npages; i++) {
336 if (pages[i])
337 __free_page(pages[i]);
338 }
339 kfree(pages);
340 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
341 }
342
343 /*
344 * Test case: ensure that memset() can initialize a buffer allocated via
345 * vmalloc().
346 */
347 static void test_init_vmalloc(struct kunit *test)
348 {
349 EXPECTATION_NO_REPORT(expect);
350 int npages = 8;
351 char *buf;
352
353 kunit_info(test, "vmalloc buffer can be initialized (no reports)\n");
354 buf = vmalloc(PAGE_SIZE * npages);
355 buf[0] = 1;
356 memset(buf, 0xfe, PAGE_SIZE * npages);
357 USE(buf[0]);
358 for (int i = 0; i < npages; i++)
359 kmsan_check_memory(&buf[PAGE_SIZE * i], PAGE_SIZE);
360 vfree(buf);
361 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
362 }
363
364 /* Test case: ensure that use-after-free reporting works. */
365 static void test_uaf(struct kunit *test)
366 {
367 EXPECTATION_USE_AFTER_FREE(expect);
368 volatile int value;
369 volatile int *var;
370
371 kunit_info(test, "use-after-free in kmalloc-ed buffer (UMR report)\n");
372 var = kmalloc(80, GFP_KERNEL);
373 var[3] = 0xfeedface;
374 kfree((int *)var);
375 /* Copy the invalid value before checking it. */
376 value = var[3];
377 USE(value);
378 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
379 }
380
381 /*
382 * Test case: ensure that uninitialized values are propagated through per-CPU
383 * memory.
384 */
385 static void test_percpu_propagate(struct kunit *test)
386 {
387 EXPECTATION_UNINIT_VALUE(expect);
388 volatile int uninit, check;
389
390 kunit_info(test,
391 "uninit local stored to per_cpu memory (UMR report)\n");
392
393 this_cpu_write(per_cpu_var, uninit);
394 check = this_cpu_read(per_cpu_var);
395 USE(check);
396 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
397 }
398
399 /*
400 * Test case: ensure that passing uninitialized values to printk() leads to an
401 * error report.
402 */
403 static void test_printk(struct kunit *test)
404 {
405 #ifdef CONFIG_KMSAN_CHECK_PARAM_RETVAL
406 /*
407 * With eager param/retval checking enabled, KMSAN will report an error
408 * before the call to pr_info().
409 */
410 EXPECTATION_UNINIT_VALUE_FN(expect, "test_printk");
411 #else
412 EXPECTATION_UNINIT_VALUE_FN(expect, "number");
413 #endif
414 volatile int uninit;
415
416 kunit_info(test, "uninit local passed to pr_info() (UMR report)\n");
417 pr_info("%px contains %d\n", &uninit, uninit);
418 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
419 }
420
421 /* Prevent the compiler from inlining a memcpy() call. */
422 static noinline void *memcpy_noinline(volatile void *dst,
423 const volatile void *src, size_t size)
424 {
425 return memcpy((void *)dst, (const void *)src, size);
426 }
427
428 /* Test case: ensure that memcpy() correctly copies initialized values. */
429 static void test_init_memcpy(struct kunit *test)
430 {
431 EXPECTATION_NO_REPORT(expect);
432 volatile long long src;
433 volatile long long dst = 0;
434
435 src = 1;
436 kunit_info(
437 test,
438 "memcpy()ing aligned initialized src to aligned dst (no reports)\n");
439 memcpy_noinline((void *)&dst, (void *)&src, sizeof(src));
440 kmsan_check_memory((void *)&dst, sizeof(dst));
441 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
442 }
443
444 /*
445 * Test case: ensure that memcpy() correctly copies uninitialized values between
446 * aligned `src` and `dst`.
447 */
448 static void test_memcpy_aligned_to_aligned(struct kunit *test)
449 {
450 EXPECTATION_UNINIT_VALUE_FN(expect, "test_memcpy_aligned_to_aligned");
451 volatile int uninit_src;
452 volatile int dst = 0;
453
454 kunit_info(
455 test,
456 "memcpy()ing aligned uninit src to aligned dst (UMR report)\n");
457 memcpy_noinline((void *)&dst, (void *)&uninit_src, sizeof(uninit_src));
458 kmsan_check_memory((void *)&dst, sizeof(dst));
459 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
460 }
461
462 /*
463 * Test case: ensure that memcpy() correctly copies uninitialized values between
464 * aligned `src` and unaligned `dst`.
465 *
466 * Copying aligned 4-byte value to an unaligned one leads to touching two
467 * aligned 4-byte values. This test case checks that KMSAN correctly reports an
468 * error on the mentioned two values.
469 */
470 static void test_memcpy_aligned_to_unaligned(struct kunit *test)
471 {
472 EXPECTATION_UNINIT_VALUE_FN(expect, "test_memcpy_aligned_to_unaligned");
473 volatile int uninit_src;
474 volatile char dst[8] = { 0 };
475
476 kunit_info(
477 test,
478 "memcpy()ing aligned uninit src to unaligned dst (UMR report)\n");
479 kmsan_check_memory((void *)&uninit_src, sizeof(uninit_src));
480 memcpy_noinline((void *)&dst[1], (void *)&uninit_src,
481 sizeof(uninit_src));
482 kmsan_check_memory((void *)dst, 4);
483 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
484 report_reset();
485 kmsan_check_memory((void *)&dst[4], sizeof(uninit_src));
486 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
487 }
488
489 /*
490 * Test case: ensure that origin slots do not accidentally get overwritten with
491 * zeroes during memcpy().
492 *
493 * Previously, when copying memory from an aligned buffer to an unaligned one,
494 * if there were zero origins corresponding to zero shadow values in the source
495 * buffer, they could have ended up being copied to nonzero shadow values in the
496 * destination buffer:
497 *
498 * memcpy(0xffff888080a00000, 0xffff888080900002, 8)
499 *
500 * src (0xffff888080900002): ..xx .... xx..
501 * src origins: o111 0000 o222
502 * dst (0xffff888080a00000): xx.. ..xx
503 * dst origins: o111 0000
504 * (or 0000 o222)
505 *
506 * (here . stands for an initialized byte, and x for an uninitialized one.
507 *
508 * Ensure that this does not happen anymore, and for both destination bytes
509 * the origin is nonzero (i.e. KMSAN reports an error).
510 */
511 static void test_memcpy_initialized_gap(struct kunit *test)
512 {
513 EXPECTATION_UNINIT_VALUE_FN(expect, "test_memcpy_initialized_gap");
514 volatile char uninit_src[12];
515 volatile char dst[8] = { 0 };
516
517 kunit_info(
518 test,
519 "unaligned 4-byte initialized value gets a nonzero origin after memcpy() - (2 UMR reports)\n");
520
521 uninit_src[0] = 42;
522 uninit_src[1] = 42;
523 uninit_src[4] = 42;
524 uninit_src[5] = 42;
525 uninit_src[6] = 42;
526 uninit_src[7] = 42;
527 uninit_src[10] = 42;
528 uninit_src[11] = 42;
529 memcpy_noinline((void *)&dst[0], (void *)&uninit_src[2], 8);
530
531 kmsan_check_memory((void *)&dst[0], 4);
532 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
533 report_reset();
534 kmsan_check_memory((void *)&dst[2], 4);
535 KUNIT_EXPECT_FALSE(test, report_matches(&expect));
536 report_reset();
537 kmsan_check_memory((void *)&dst[4], 4);
538 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
539 }
540
541 /* Generate test cases for memset16(), memset32(), memset64(). */
542 #define DEFINE_TEST_MEMSETXX(size) \
543 static void test_memset##size(struct kunit *test) \
544 { \
545 EXPECTATION_NO_REPORT(expect); \
546 volatile uint##size##_t uninit; \
547 \
548 kunit_info(test, \
549 "memset" #size "() should initialize memory\n"); \
550 memset##size((uint##size##_t *)&uninit, 0, 1); \
551 kmsan_check_memory((void *)&uninit, sizeof(uninit)); \
552 KUNIT_EXPECT_TRUE(test, report_matches(&expect)); \
553 }
554
555 DEFINE_TEST_MEMSETXX(16)
556 DEFINE_TEST_MEMSETXX(32)
557 DEFINE_TEST_MEMSETXX(64)
558
559 static noinline void fibonacci(int *array, int size, int start)
560 {
561 if (start < 2 || (start == size))
562 return;
563 array[start] = array[start - 1] + array[start - 2];
564 fibonacci(array, size, start + 1);
565 }
566
567 static void test_long_origin_chain(struct kunit *test)
568 {
569 EXPECTATION_UNINIT_VALUE_FN(expect, "test_long_origin_chain");
570 /* (KMSAN_MAX_ORIGIN_DEPTH * 2) recursive calls to fibonacci(). */
571 volatile int accum[KMSAN_MAX_ORIGIN_DEPTH * 2 + 2];
572 int last = ARRAY_SIZE(accum) - 1;
573
574 kunit_info(
575 test,
576 "origin chain exceeding KMSAN_MAX_ORIGIN_DEPTH (UMR report)\n");
577 /*
578 * We do not set accum[1] to 0, so the uninitializedness will be carried
579 * over to accum[2..last].
580 */
581 accum[0] = 1;
582 fibonacci((int *)accum, ARRAY_SIZE(accum), 2);
583 kmsan_check_memory((void *)&accum[last], sizeof(int));
584 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
585 }
586
587 /*
588 * Test case: ensure that saving/restoring/printing stacks to/from stackdepot
589 * does not trigger errors.
590 *
591 * KMSAN uses stackdepot to store origin stack traces, that's why we do not
592 * instrument lib/stackdepot.c. Yet it must properly mark its outputs as
593 * initialized because other kernel features (e.g. netdev tracker) may also
594 * access stackdepot from instrumented code.
595 */
596 static void test_stackdepot_roundtrip(struct kunit *test)
597 {
598 unsigned long src_entries[16], *dst_entries;
599 unsigned int src_nentries, dst_nentries;
600 EXPECTATION_NO_REPORT(expect);
601 depot_stack_handle_t handle;
602
603 kunit_info(test, "testing stackdepot roundtrip (no reports)\n");
604
605 src_nentries =
606 stack_trace_save(src_entries, ARRAY_SIZE(src_entries), 1);
607 handle = stack_depot_save(src_entries, src_nentries, GFP_KERNEL);
608 stack_depot_print(handle);
609 dst_nentries = stack_depot_fetch(handle, &dst_entries);
610 KUNIT_EXPECT_TRUE(test, src_nentries == dst_nentries);
611
612 kmsan_check_memory((void *)dst_entries,
613 sizeof(*dst_entries) * dst_nentries);
614 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
615 }
616
617 /*
618 * Test case: ensure that kmsan_unpoison_memory() and the instrumentation work
619 * the same.
620 */
621 static void test_unpoison_memory(struct kunit *test)
622 {
623 EXPECTATION_UNINIT_VALUE_FN(expect, "test_unpoison_memory");
624 volatile char a[4], b[4];
625
626 kunit_info(
627 test,
628 "unpoisoning via the instrumentation vs. kmsan_unpoison_memory() (2 UMR reports)\n");
629
630 /* Initialize a[0] and check a[1]--a[3]. */
631 a[0] = 0;
632 kmsan_check_memory((char *)&a[1], 3);
633 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
634
635 report_reset();
636
637 /* Initialize b[0] and check b[1]--b[3]. */
638 kmsan_unpoison_memory((char *)&b[0], 1);
639 kmsan_check_memory((char *)&b[1], 3);
640 KUNIT_EXPECT_TRUE(test, report_matches(&expect));
641 }
642
643 static struct kunit_case kmsan_test_cases[] = {
644 KUNIT_CASE(test_uninit_kmalloc),
645 KUNIT_CASE(test_init_kmalloc),
646 KUNIT_CASE(test_init_kzalloc),
647 KUNIT_CASE(test_uninit_stack_var),
648 KUNIT_CASE(test_init_stack_var),
649 KUNIT_CASE(test_params),
650 KUNIT_CASE(test_uninit_multiple_params),
651 KUNIT_CASE(test_uninit_kmsan_check_memory),
652 KUNIT_CASE(test_init_kmsan_vmap_vunmap),
653 KUNIT_CASE(test_init_vmalloc),
654 KUNIT_CASE(test_uaf),
655 KUNIT_CASE(test_percpu_propagate),
656 KUNIT_CASE(test_printk),
657 KUNIT_CASE(test_init_memcpy),
658 KUNIT_CASE(test_memcpy_aligned_to_aligned),
659 KUNIT_CASE(test_memcpy_aligned_to_unaligned),
660 KUNIT_CASE(test_memcpy_initialized_gap),
661 KUNIT_CASE(test_memset16),
662 KUNIT_CASE(test_memset32),
663 KUNIT_CASE(test_memset64),
664 KUNIT_CASE(test_long_origin_chain),
665 KUNIT_CASE(test_stackdepot_roundtrip),
666 KUNIT_CASE(test_unpoison_memory),
667 {},
668 };
669
670 /* ===== End test cases ===== */
671
672 static int test_init(struct kunit *test)
673 {
674 unsigned long flags;
675
676 spin_lock_irqsave(&observed.lock, flags);
677 observed.header[0] = '\0';
678 observed.ignore = false;
679 observed.available = false;
680 spin_unlock_irqrestore(&observed.lock, flags);
681
682 return 0;
683 }
684
685 static void test_exit(struct kunit *test)
686 {
687 }
688
689 static int orig_panic_on_kmsan;
690
691 static int kmsan_suite_init(struct kunit_suite *suite)
692 {
693 register_trace_console(probe_console, NULL);
694 orig_panic_on_kmsan = panic_on_kmsan;
695 panic_on_kmsan = 0;
696 return 0;
697 }
698
699 static void kmsan_suite_exit(struct kunit_suite *suite)
700 {
701 unregister_trace_console(probe_console, NULL);
702 tracepoint_synchronize_unregister();
703 panic_on_kmsan = orig_panic_on_kmsan;
704 }
705
706 static struct kunit_suite kmsan_test_suite = {
707 .name = "kmsan",
708 .test_cases = kmsan_test_cases,
709 .init = test_init,
710 .exit = test_exit,
711 .suite_init = kmsan_suite_init,
712 .suite_exit = kmsan_suite_exit,
713 };
714 kunit_test_suites(&kmsan_test_suite);
715
716 MODULE_LICENSE("GPL");
717 MODULE_AUTHOR("Alexander Potapenko <glider@google.com>");
718
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