1 // SPDX-License-Identifier: GPL-2.0-only
4 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
5 * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
8 #include <linux/bitops.h>
9 #include <linux/delay.h>
10 #include <linux/kasan.h>
11 #include <linux/kernel.h>
13 #include <linux/mman.h>
14 #include <linux/module.h>
15 #include <linux/printk.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/uaccess.h>
21 #include <linux/vmalloc.h>
22 #include <linux/set_memory.h>
26 #include <kunit/test.h>
28 #include "../mm/kasan/kasan.h"
30 #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE)
33 * Some tests use these global variables to store return values from function
34 * calls that could otherwise be eliminated by the compiler as dead code.
36 void *kasan_ptr_result
;
39 static struct kunit_resource resource
;
40 static struct kunit_kasan_status test_status
;
41 static bool multishot
;
44 * Temporarily enable multi-shot mode. Otherwise, KASAN would only report the
45 * first detected bug and panic the kernel if panic_on_warn is enabled. For
46 * hardware tag-based KASAN also allow tag checking to be reenabled for each
47 * test, see the comment for KUNIT_EXPECT_KASAN_FAIL().
49 static int kasan_test_init(struct kunit
*test
)
51 if (!kasan_enabled()) {
52 kunit_err(test
, "can't run KASAN tests with KASAN disabled");
56 multishot
= kasan_save_enable_multi_shot();
57 test_status
.report_found
= false;
58 test_status
.sync_fault
= false;
59 kunit_add_named_resource(test
, NULL
, NULL
, &resource
,
60 "kasan_status", &test_status
);
64 static void kasan_test_exit(struct kunit
*test
)
66 kasan_restore_multi_shot(multishot
);
67 KUNIT_EXPECT_FALSE(test
, test_status
.report_found
);
71 * KUNIT_EXPECT_KASAN_FAIL() - check that the executed expression produces a
72 * KASAN report; causes a test failure otherwise. This relies on a KUnit
73 * resource named "kasan_status". Do not use this name for KUnit resources
74 * outside of KASAN tests.
76 * For hardware tag-based KASAN, when a synchronous tag fault happens, tag
77 * checking is auto-disabled. When this happens, this test handler reenables
78 * tag checking. As tag checking can be only disabled or enabled per CPU,
79 * this handler disables migration (preemption).
81 * Since the compiler doesn't see that the expression can change the test_status
82 * fields, it can reorder or optimize away the accesses to those fields.
83 * Use READ/WRITE_ONCE() for the accesses and compiler barriers around the
84 * expression to prevent that.
86 * In between KUNIT_EXPECT_KASAN_FAIL checks, test_status.report_found is kept
87 * as false. This allows detecting KASAN reports that happen outside of the
88 * checks by asserting !test_status.report_found at the start of
89 * KUNIT_EXPECT_KASAN_FAIL and in kasan_test_exit.
91 #define KUNIT_EXPECT_KASAN_FAIL(test, expression) do { \
92 if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
93 kasan_sync_fault_possible()) \
95 KUNIT_EXPECT_FALSE(test, READ_ONCE(test_status.report_found)); \
99 if (kasan_async_fault_possible()) \
100 kasan_force_async_fault(); \
101 if (!READ_ONCE(test_status.report_found)) { \
102 KUNIT_FAIL(test, KUNIT_SUBTEST_INDENT "KASAN failure " \
103 "expected in \"" #expression \
104 "\", but none occurred"); \
106 if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
107 kasan_sync_fault_possible()) { \
108 if (READ_ONCE(test_status.report_found) && \
109 READ_ONCE(test_status.sync_fault)) \
110 kasan_enable_tagging(); \
113 WRITE_ONCE(test_status.report_found, false); \
116 #define KASAN_TEST_NEEDS_CONFIG_ON(test, config) do { \
117 if (!IS_ENABLED(config)) \
118 kunit_skip((test), "Test requires " #config "=y"); \
121 #define KASAN_TEST_NEEDS_CONFIG_OFF(test, config) do { \
122 if (IS_ENABLED(config)) \
123 kunit_skip((test), "Test requires " #config "=n"); \
126 static void kmalloc_oob_right(struct kunit
*test
)
129 size_t size
= 128 - KASAN_GRANULE_SIZE
- 5;
131 ptr
= kmalloc(size
, GFP_KERNEL
);
132 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
134 OPTIMIZER_HIDE_VAR(ptr
);
136 * An unaligned access past the requested kmalloc size.
137 * Only generic KASAN can precisely detect these.
139 if (IS_ENABLED(CONFIG_KASAN_GENERIC
))
140 KUNIT_EXPECT_KASAN_FAIL(test
, ptr
[size
] = 'x');
143 * An aligned access into the first out-of-bounds granule that falls
144 * within the aligned kmalloc object.
146 KUNIT_EXPECT_KASAN_FAIL(test
, ptr
[size
+ 5] = 'y');
148 /* Out-of-bounds access past the aligned kmalloc object. */
149 KUNIT_EXPECT_KASAN_FAIL(test
, ptr
[0] =
150 ptr
[size
+ KASAN_GRANULE_SIZE
+ 5]);
155 static void kmalloc_oob_left(struct kunit
*test
)
160 ptr
= kmalloc(size
, GFP_KERNEL
);
161 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
163 OPTIMIZER_HIDE_VAR(ptr
);
164 KUNIT_EXPECT_KASAN_FAIL(test
, *ptr
= *(ptr
- 1));
168 static void kmalloc_node_oob_right(struct kunit
*test
)
173 ptr
= kmalloc_node(size
, GFP_KERNEL
, 0);
174 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
176 OPTIMIZER_HIDE_VAR(ptr
);
177 KUNIT_EXPECT_KASAN_FAIL(test
, ptr
[0] = ptr
[size
]);
182 * These kmalloc_pagealloc_* tests try allocating a memory chunk that doesn't
183 * fit into a slab cache and therefore is allocated via the page allocator
184 * fallback. Since this kind of fallback is only implemented for SLUB, these
185 * tests are limited to that allocator.
187 static void kmalloc_pagealloc_oob_right(struct kunit
*test
)
190 size_t size
= KMALLOC_MAX_CACHE_SIZE
+ 10;
192 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_SLUB
);
194 ptr
= kmalloc(size
, GFP_KERNEL
);
195 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
197 OPTIMIZER_HIDE_VAR(ptr
);
198 KUNIT_EXPECT_KASAN_FAIL(test
, ptr
[size
+ OOB_TAG_OFF
] = 0);
203 static void kmalloc_pagealloc_uaf(struct kunit
*test
)
206 size_t size
= KMALLOC_MAX_CACHE_SIZE
+ 10;
208 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_SLUB
);
210 ptr
= kmalloc(size
, GFP_KERNEL
);
211 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
214 KUNIT_EXPECT_KASAN_FAIL(test
, ((volatile char *)ptr
)[0]);
217 static void kmalloc_pagealloc_invalid_free(struct kunit
*test
)
220 size_t size
= KMALLOC_MAX_CACHE_SIZE
+ 10;
222 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_SLUB
);
224 ptr
= kmalloc(size
, GFP_KERNEL
);
225 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
227 KUNIT_EXPECT_KASAN_FAIL(test
, kfree(ptr
+ 1));
230 static void pagealloc_oob_right(struct kunit
*test
)
235 size_t size
= (1UL << (PAGE_SHIFT
+ order
));
238 * With generic KASAN page allocations have no redzones, thus
239 * out-of-bounds detection is not guaranteed.
240 * See https://bugzilla.kernel.org/show_bug.cgi?id=210503.
242 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_KASAN_GENERIC
);
244 pages
= alloc_pages(GFP_KERNEL
, order
);
245 ptr
= page_address(pages
);
246 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
248 KUNIT_EXPECT_KASAN_FAIL(test
, ptr
[0] = ptr
[size
]);
249 free_pages((unsigned long)ptr
, order
);
252 static void pagealloc_uaf(struct kunit
*test
)
258 pages
= alloc_pages(GFP_KERNEL
, order
);
259 ptr
= page_address(pages
);
260 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
261 free_pages((unsigned long)ptr
, order
);
263 KUNIT_EXPECT_KASAN_FAIL(test
, ((volatile char *)ptr
)[0]);
266 static void kmalloc_large_oob_right(struct kunit
*test
)
269 size_t size
= KMALLOC_MAX_CACHE_SIZE
- 256;
272 * Allocate a chunk that is large enough, but still fits into a slab
273 * and does not trigger the page allocator fallback in SLUB.
275 ptr
= kmalloc(size
, GFP_KERNEL
);
276 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
278 OPTIMIZER_HIDE_VAR(ptr
);
279 KUNIT_EXPECT_KASAN_FAIL(test
, ptr
[size
] = 0);
283 static void krealloc_more_oob_helper(struct kunit
*test
,
284 size_t size1
, size_t size2
)
289 KUNIT_ASSERT_LT(test
, size1
, size2
);
290 middle
= size1
+ (size2
- size1
) / 2;
292 ptr1
= kmalloc(size1
, GFP_KERNEL
);
293 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr1
);
295 ptr2
= krealloc(ptr1
, size2
, GFP_KERNEL
);
296 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr2
);
298 /* All offsets up to size2 must be accessible. */
299 ptr2
[size1
- 1] = 'x';
302 ptr2
[size2
- 1] = 'x';
304 /* Generic mode is precise, so unaligned size2 must be inaccessible. */
305 if (IS_ENABLED(CONFIG_KASAN_GENERIC
))
306 KUNIT_EXPECT_KASAN_FAIL(test
, ptr2
[size2
] = 'x');
308 /* For all modes first aligned offset after size2 must be inaccessible. */
309 KUNIT_EXPECT_KASAN_FAIL(test
,
310 ptr2
[round_up(size2
, KASAN_GRANULE_SIZE
)] = 'x');
315 static void krealloc_less_oob_helper(struct kunit
*test
,
316 size_t size1
, size_t size2
)
321 KUNIT_ASSERT_LT(test
, size2
, size1
);
322 middle
= size2
+ (size1
- size2
) / 2;
324 ptr1
= kmalloc(size1
, GFP_KERNEL
);
325 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr1
);
327 ptr2
= krealloc(ptr1
, size2
, GFP_KERNEL
);
328 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr2
);
330 /* Must be accessible for all modes. */
331 ptr2
[size2
- 1] = 'x';
333 /* Generic mode is precise, so unaligned size2 must be inaccessible. */
334 if (IS_ENABLED(CONFIG_KASAN_GENERIC
))
335 KUNIT_EXPECT_KASAN_FAIL(test
, ptr2
[size2
] = 'x');
337 /* For all modes first aligned offset after size2 must be inaccessible. */
338 KUNIT_EXPECT_KASAN_FAIL(test
,
339 ptr2
[round_up(size2
, KASAN_GRANULE_SIZE
)] = 'x');
342 * For all modes all size2, middle, and size1 should land in separate
343 * granules and thus the latter two offsets should be inaccessible.
345 KUNIT_EXPECT_LE(test
, round_up(size2
, KASAN_GRANULE_SIZE
),
346 round_down(middle
, KASAN_GRANULE_SIZE
));
347 KUNIT_EXPECT_LE(test
, round_up(middle
, KASAN_GRANULE_SIZE
),
348 round_down(size1
, KASAN_GRANULE_SIZE
));
349 KUNIT_EXPECT_KASAN_FAIL(test
, ptr2
[middle
] = 'x');
350 KUNIT_EXPECT_KASAN_FAIL(test
, ptr2
[size1
- 1] = 'x');
351 KUNIT_EXPECT_KASAN_FAIL(test
, ptr2
[size1
] = 'x');
356 static void krealloc_more_oob(struct kunit
*test
)
358 krealloc_more_oob_helper(test
, 201, 235);
361 static void krealloc_less_oob(struct kunit
*test
)
363 krealloc_less_oob_helper(test
, 235, 201);
366 static void krealloc_pagealloc_more_oob(struct kunit
*test
)
368 /* page_alloc fallback in only implemented for SLUB. */
369 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_SLUB
);
371 krealloc_more_oob_helper(test
, KMALLOC_MAX_CACHE_SIZE
+ 201,
372 KMALLOC_MAX_CACHE_SIZE
+ 235);
375 static void krealloc_pagealloc_less_oob(struct kunit
*test
)
377 /* page_alloc fallback in only implemented for SLUB. */
378 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_SLUB
);
380 krealloc_less_oob_helper(test
, KMALLOC_MAX_CACHE_SIZE
+ 235,
381 KMALLOC_MAX_CACHE_SIZE
+ 201);
385 * Check that krealloc() detects a use-after-free, returns NULL,
386 * and doesn't unpoison the freed object.
388 static void krealloc_uaf(struct kunit
*test
)
394 ptr1
= kmalloc(size1
, GFP_KERNEL
);
395 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr1
);
398 KUNIT_EXPECT_KASAN_FAIL(test
, ptr2
= krealloc(ptr1
, size2
, GFP_KERNEL
));
399 KUNIT_ASSERT_NULL(test
, ptr2
);
400 KUNIT_EXPECT_KASAN_FAIL(test
, *(volatile char *)ptr1
);
403 static void kmalloc_oob_16(struct kunit
*test
)
409 /* This test is specifically crafted for the generic mode. */
410 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_GENERIC
);
412 ptr1
= kmalloc(sizeof(*ptr1
) - 3, GFP_KERNEL
);
413 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr1
);
415 ptr2
= kmalloc(sizeof(*ptr2
), GFP_KERNEL
);
416 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr2
);
418 OPTIMIZER_HIDE_VAR(ptr1
);
419 OPTIMIZER_HIDE_VAR(ptr2
);
420 KUNIT_EXPECT_KASAN_FAIL(test
, *ptr1
= *ptr2
);
425 static void kmalloc_uaf_16(struct kunit
*test
)
431 ptr1
= kmalloc(sizeof(*ptr1
), GFP_KERNEL
);
432 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr1
);
434 ptr2
= kmalloc(sizeof(*ptr2
), GFP_KERNEL
);
435 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr2
);
438 KUNIT_EXPECT_KASAN_FAIL(test
, *ptr1
= *ptr2
);
443 * Note: in the memset tests below, the written range touches both valid and
444 * invalid memory. This makes sure that the instrumentation does not only check
445 * the starting address but the whole range.
448 static void kmalloc_oob_memset_2(struct kunit
*test
)
451 size_t size
= 128 - KASAN_GRANULE_SIZE
;
453 ptr
= kmalloc(size
, GFP_KERNEL
);
454 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
456 OPTIMIZER_HIDE_VAR(size
);
457 KUNIT_EXPECT_KASAN_FAIL(test
, memset(ptr
+ size
- 1, 0, 2));
461 static void kmalloc_oob_memset_4(struct kunit
*test
)
464 size_t size
= 128 - KASAN_GRANULE_SIZE
;
466 ptr
= kmalloc(size
, GFP_KERNEL
);
467 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
469 OPTIMIZER_HIDE_VAR(size
);
470 KUNIT_EXPECT_KASAN_FAIL(test
, memset(ptr
+ size
- 3, 0, 4));
474 static void kmalloc_oob_memset_8(struct kunit
*test
)
477 size_t size
= 128 - KASAN_GRANULE_SIZE
;
479 ptr
= kmalloc(size
, GFP_KERNEL
);
480 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
482 OPTIMIZER_HIDE_VAR(size
);
483 KUNIT_EXPECT_KASAN_FAIL(test
, memset(ptr
+ size
- 7, 0, 8));
487 static void kmalloc_oob_memset_16(struct kunit
*test
)
490 size_t size
= 128 - KASAN_GRANULE_SIZE
;
492 ptr
= kmalloc(size
, GFP_KERNEL
);
493 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
495 OPTIMIZER_HIDE_VAR(size
);
496 KUNIT_EXPECT_KASAN_FAIL(test
, memset(ptr
+ size
- 15, 0, 16));
500 static void kmalloc_oob_in_memset(struct kunit
*test
)
503 size_t size
= 128 - KASAN_GRANULE_SIZE
;
505 ptr
= kmalloc(size
, GFP_KERNEL
);
506 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
508 OPTIMIZER_HIDE_VAR(ptr
);
509 OPTIMIZER_HIDE_VAR(size
);
510 KUNIT_EXPECT_KASAN_FAIL(test
,
511 memset(ptr
, 0, size
+ KASAN_GRANULE_SIZE
));
515 static void kmalloc_memmove_negative_size(struct kunit
*test
)
519 size_t invalid_size
= -2;
522 * Hardware tag-based mode doesn't check memmove for negative size.
523 * As a result, this test introduces a side-effect memory corruption,
524 * which can result in a crash.
526 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_KASAN_HW_TAGS
);
528 ptr
= kmalloc(size
, GFP_KERNEL
);
529 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
531 memset((char *)ptr
, 0, 64);
532 OPTIMIZER_HIDE_VAR(ptr
);
533 OPTIMIZER_HIDE_VAR(invalid_size
);
534 KUNIT_EXPECT_KASAN_FAIL(test
,
535 memmove((char *)ptr
, (char *)ptr
+ 4, invalid_size
));
539 static void kmalloc_memmove_invalid_size(struct kunit
*test
)
543 volatile size_t invalid_size
= size
;
545 ptr
= kmalloc(size
, GFP_KERNEL
);
546 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
548 memset((char *)ptr
, 0, 64);
549 OPTIMIZER_HIDE_VAR(ptr
);
550 KUNIT_EXPECT_KASAN_FAIL(test
,
551 memmove((char *)ptr
, (char *)ptr
+ 4, invalid_size
));
555 static void kmalloc_uaf(struct kunit
*test
)
560 ptr
= kmalloc(size
, GFP_KERNEL
);
561 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
564 KUNIT_EXPECT_KASAN_FAIL(test
, ((volatile char *)ptr
)[8]);
567 static void kmalloc_uaf_memset(struct kunit
*test
)
573 * Only generic KASAN uses quarantine, which is required to avoid a
574 * kernel memory corruption this test causes.
576 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_GENERIC
);
578 ptr
= kmalloc(size
, GFP_KERNEL
);
579 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
582 KUNIT_EXPECT_KASAN_FAIL(test
, memset(ptr
, 0, size
));
585 static void kmalloc_uaf2(struct kunit
*test
)
592 ptr1
= kmalloc(size
, GFP_KERNEL
);
593 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr1
);
597 ptr2
= kmalloc(size
, GFP_KERNEL
);
598 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr2
);
601 * For tag-based KASAN ptr1 and ptr2 tags might happen to be the same.
602 * Allow up to 16 attempts at generating different tags.
604 if (!IS_ENABLED(CONFIG_KASAN_GENERIC
) && ptr1
== ptr2
&& counter
++ < 16) {
609 KUNIT_EXPECT_KASAN_FAIL(test
, ((volatile char *)ptr1
)[40]);
610 KUNIT_EXPECT_PTR_NE(test
, ptr1
, ptr2
);
615 static void kfree_via_page(struct kunit
*test
)
620 unsigned long offset
;
622 ptr
= kmalloc(size
, GFP_KERNEL
);
623 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
625 page
= virt_to_page(ptr
);
626 offset
= offset_in_page(ptr
);
627 kfree(page_address(page
) + offset
);
630 static void kfree_via_phys(struct kunit
*test
)
636 ptr
= kmalloc(size
, GFP_KERNEL
);
637 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
639 phys
= virt_to_phys(ptr
);
640 kfree(phys_to_virt(phys
));
643 static void kmem_cache_oob(struct kunit
*test
)
647 struct kmem_cache
*cache
;
649 cache
= kmem_cache_create("test_cache", size
, 0, 0, NULL
);
650 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, cache
);
652 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
654 kunit_err(test
, "Allocation failed: %s\n", __func__
);
655 kmem_cache_destroy(cache
);
659 KUNIT_EXPECT_KASAN_FAIL(test
, *p
= p
[size
+ OOB_TAG_OFF
]);
661 kmem_cache_free(cache
, p
);
662 kmem_cache_destroy(cache
);
665 static void kmem_cache_accounted(struct kunit
*test
)
670 struct kmem_cache
*cache
;
672 cache
= kmem_cache_create("test_cache", size
, 0, SLAB_ACCOUNT
, NULL
);
673 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, cache
);
676 * Several allocations with a delay to allow for lazy per memcg kmem
679 for (i
= 0; i
< 5; i
++) {
680 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
684 kmem_cache_free(cache
, p
);
689 kmem_cache_destroy(cache
);
692 static void kmem_cache_bulk(struct kunit
*test
)
694 struct kmem_cache
*cache
;
700 cache
= kmem_cache_create("test_cache", size
, 0, 0, NULL
);
701 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, cache
);
703 ret
= kmem_cache_alloc_bulk(cache
, GFP_KERNEL
, ARRAY_SIZE(p
), (void **)&p
);
705 kunit_err(test
, "Allocation failed: %s\n", __func__
);
706 kmem_cache_destroy(cache
);
710 for (i
= 0; i
< ARRAY_SIZE(p
); i
++)
711 p
[i
][0] = p
[i
][size
- 1] = 42;
713 kmem_cache_free_bulk(cache
, ARRAY_SIZE(p
), (void **)&p
);
714 kmem_cache_destroy(cache
);
717 static char global_array
[10];
719 static void kasan_global_oob_right(struct kunit
*test
)
722 * Deliberate out-of-bounds access. To prevent CONFIG_UBSAN_LOCAL_BOUNDS
723 * from failing here and panicking the kernel, access the array via a
724 * volatile pointer, which will prevent the compiler from being able to
725 * determine the array bounds.
727 * This access uses a volatile pointer to char (char *volatile) rather
728 * than the more conventional pointer to volatile char (volatile char *)
729 * because we want to prevent the compiler from making inferences about
730 * the pointer itself (i.e. its array bounds), not the data that it
733 char *volatile array
= global_array
;
734 char *p
= &array
[ARRAY_SIZE(global_array
) + 3];
736 /* Only generic mode instruments globals. */
737 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_GENERIC
);
739 KUNIT_EXPECT_KASAN_FAIL(test
, *(volatile char *)p
);
742 static void kasan_global_oob_left(struct kunit
*test
)
744 char *volatile array
= global_array
;
748 * GCC is known to fail this test, skip it.
749 * See https://bugzilla.kernel.org/show_bug.cgi?id=215051.
751 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_CC_IS_CLANG
);
752 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_GENERIC
);
753 KUNIT_EXPECT_KASAN_FAIL(test
, *(volatile char *)p
);
756 /* Check that ksize() makes the whole object accessible. */
757 static void ksize_unpoisons_memory(struct kunit
*test
)
760 size_t size
= 123, real_size
;
762 ptr
= kmalloc(size
, GFP_KERNEL
);
763 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
764 real_size
= ksize(ptr
);
766 OPTIMIZER_HIDE_VAR(ptr
);
768 /* This access shouldn't trigger a KASAN report. */
772 KUNIT_EXPECT_KASAN_FAIL(test
, ((volatile char *)ptr
)[real_size
]);
778 * Check that a use-after-free is detected by ksize() and via normal accesses
781 static void ksize_uaf(struct kunit
*test
)
784 int size
= 128 - KASAN_GRANULE_SIZE
;
786 ptr
= kmalloc(size
, GFP_KERNEL
);
787 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
790 OPTIMIZER_HIDE_VAR(ptr
);
791 KUNIT_EXPECT_KASAN_FAIL(test
, ksize(ptr
));
792 KUNIT_EXPECT_KASAN_FAIL(test
, ((volatile char *)ptr
)[0]);
793 KUNIT_EXPECT_KASAN_FAIL(test
, ((volatile char *)ptr
)[size
]);
796 static void kasan_stack_oob(struct kunit
*test
)
798 char stack_array
[10];
799 /* See comment in kasan_global_oob_right. */
800 char *volatile array
= stack_array
;
801 char *p
= &array
[ARRAY_SIZE(stack_array
) + OOB_TAG_OFF
];
803 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_STACK
);
805 KUNIT_EXPECT_KASAN_FAIL(test
, *(volatile char *)p
);
808 static void kasan_alloca_oob_left(struct kunit
*test
)
811 char alloca_array
[i
];
812 /* See comment in kasan_global_oob_right. */
813 char *volatile array
= alloca_array
;
816 /* Only generic mode instruments dynamic allocas. */
817 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_GENERIC
);
818 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_STACK
);
820 KUNIT_EXPECT_KASAN_FAIL(test
, *(volatile char *)p
);
823 static void kasan_alloca_oob_right(struct kunit
*test
)
826 char alloca_array
[i
];
827 /* See comment in kasan_global_oob_right. */
828 char *volatile array
= alloca_array
;
831 /* Only generic mode instruments dynamic allocas. */
832 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_GENERIC
);
833 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_STACK
);
835 KUNIT_EXPECT_KASAN_FAIL(test
, *(volatile char *)p
);
838 static void kmem_cache_double_free(struct kunit
*test
)
842 struct kmem_cache
*cache
;
844 cache
= kmem_cache_create("test_cache", size
, 0, 0, NULL
);
845 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, cache
);
847 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
849 kunit_err(test
, "Allocation failed: %s\n", __func__
);
850 kmem_cache_destroy(cache
);
854 kmem_cache_free(cache
, p
);
855 KUNIT_EXPECT_KASAN_FAIL(test
, kmem_cache_free(cache
, p
));
856 kmem_cache_destroy(cache
);
859 static void kmem_cache_invalid_free(struct kunit
*test
)
863 struct kmem_cache
*cache
;
865 cache
= kmem_cache_create("test_cache", size
, 0, SLAB_TYPESAFE_BY_RCU
,
867 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, cache
);
869 p
= kmem_cache_alloc(cache
, GFP_KERNEL
);
871 kunit_err(test
, "Allocation failed: %s\n", __func__
);
872 kmem_cache_destroy(cache
);
876 /* Trigger invalid free, the object doesn't get freed. */
877 KUNIT_EXPECT_KASAN_FAIL(test
, kmem_cache_free(cache
, p
+ 1));
880 * Properly free the object to prevent the "Objects remaining in
881 * test_cache on __kmem_cache_shutdown" BUG failure.
883 kmem_cache_free(cache
, p
);
885 kmem_cache_destroy(cache
);
888 static void empty_cache_ctor(void *object
) { }
890 static void kmem_cache_double_destroy(struct kunit
*test
)
892 struct kmem_cache
*cache
;
894 /* Provide a constructor to prevent cache merging. */
895 cache
= kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor
);
896 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, cache
);
897 kmem_cache_destroy(cache
);
898 KUNIT_EXPECT_KASAN_FAIL(test
, kmem_cache_destroy(cache
));
901 static void kasan_memchr(struct kunit
*test
)
907 * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT.
908 * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details.
910 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_AMD_MEM_ENCRYPT
);
913 size
= round_up(size
, OOB_TAG_OFF
);
915 ptr
= kmalloc(size
, GFP_KERNEL
| __GFP_ZERO
);
916 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
918 OPTIMIZER_HIDE_VAR(ptr
);
919 OPTIMIZER_HIDE_VAR(size
);
920 KUNIT_EXPECT_KASAN_FAIL(test
,
921 kasan_ptr_result
= memchr(ptr
, '1', size
+ 1));
926 static void kasan_memcmp(struct kunit
*test
)
933 * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT.
934 * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details.
936 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_AMD_MEM_ENCRYPT
);
939 size
= round_up(size
, OOB_TAG_OFF
);
941 ptr
= kmalloc(size
, GFP_KERNEL
| __GFP_ZERO
);
942 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
943 memset(arr
, 0, sizeof(arr
));
945 OPTIMIZER_HIDE_VAR(ptr
);
946 OPTIMIZER_HIDE_VAR(size
);
947 KUNIT_EXPECT_KASAN_FAIL(test
,
948 kasan_int_result
= memcmp(ptr
, arr
, size
+1));
952 static void kasan_strings(struct kunit
*test
)
958 * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT.
959 * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details.
961 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_AMD_MEM_ENCRYPT
);
963 ptr
= kmalloc(size
, GFP_KERNEL
| __GFP_ZERO
);
964 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
969 * Try to cause only 1 invalid access (less spam in dmesg).
970 * For that we need ptr to point to zeroed byte.
971 * Skip metadata that could be stored in freed object so ptr
972 * will likely point to zeroed byte.
975 KUNIT_EXPECT_KASAN_FAIL(test
, kasan_ptr_result
= strchr(ptr
, '1'));
977 KUNIT_EXPECT_KASAN_FAIL(test
, kasan_ptr_result
= strrchr(ptr
, '1'));
979 KUNIT_EXPECT_KASAN_FAIL(test
, kasan_int_result
= strcmp(ptr
, "2"));
981 KUNIT_EXPECT_KASAN_FAIL(test
, kasan_int_result
= strncmp(ptr
, "2", 1));
983 KUNIT_EXPECT_KASAN_FAIL(test
, kasan_int_result
= strlen(ptr
));
985 KUNIT_EXPECT_KASAN_FAIL(test
, kasan_int_result
= strnlen(ptr
, 1));
988 static void kasan_bitops_modify(struct kunit
*test
, int nr
, void *addr
)
990 KUNIT_EXPECT_KASAN_FAIL(test
, set_bit(nr
, addr
));
991 KUNIT_EXPECT_KASAN_FAIL(test
, __set_bit(nr
, addr
));
992 KUNIT_EXPECT_KASAN_FAIL(test
, clear_bit(nr
, addr
));
993 KUNIT_EXPECT_KASAN_FAIL(test
, __clear_bit(nr
, addr
));
994 KUNIT_EXPECT_KASAN_FAIL(test
, clear_bit_unlock(nr
, addr
));
995 KUNIT_EXPECT_KASAN_FAIL(test
, __clear_bit_unlock(nr
, addr
));
996 KUNIT_EXPECT_KASAN_FAIL(test
, change_bit(nr
, addr
));
997 KUNIT_EXPECT_KASAN_FAIL(test
, __change_bit(nr
, addr
));
1000 static void kasan_bitops_test_and_modify(struct kunit
*test
, int nr
, void *addr
)
1002 KUNIT_EXPECT_KASAN_FAIL(test
, test_and_set_bit(nr
, addr
));
1003 KUNIT_EXPECT_KASAN_FAIL(test
, __test_and_set_bit(nr
, addr
));
1004 KUNIT_EXPECT_KASAN_FAIL(test
, test_and_set_bit_lock(nr
, addr
));
1005 KUNIT_EXPECT_KASAN_FAIL(test
, test_and_clear_bit(nr
, addr
));
1006 KUNIT_EXPECT_KASAN_FAIL(test
, __test_and_clear_bit(nr
, addr
));
1007 KUNIT_EXPECT_KASAN_FAIL(test
, test_and_change_bit(nr
, addr
));
1008 KUNIT_EXPECT_KASAN_FAIL(test
, __test_and_change_bit(nr
, addr
));
1009 KUNIT_EXPECT_KASAN_FAIL(test
, kasan_int_result
= test_bit(nr
, addr
));
1011 #if defined(clear_bit_unlock_is_negative_byte)
1012 KUNIT_EXPECT_KASAN_FAIL(test
, kasan_int_result
=
1013 clear_bit_unlock_is_negative_byte(nr
, addr
));
1017 static void kasan_bitops_generic(struct kunit
*test
)
1021 /* This test is specifically crafted for the generic mode. */
1022 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_GENERIC
);
1025 * Allocate 1 more byte, which causes kzalloc to round up to 16 bytes;
1026 * this way we do not actually corrupt other memory.
1028 bits
= kzalloc(sizeof(*bits
) + 1, GFP_KERNEL
);
1029 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, bits
);
1032 * Below calls try to access bit within allocated memory; however, the
1033 * below accesses are still out-of-bounds, since bitops are defined to
1034 * operate on the whole long the bit is in.
1036 kasan_bitops_modify(test
, BITS_PER_LONG
, bits
);
1039 * Below calls try to access bit beyond allocated memory.
1041 kasan_bitops_test_and_modify(test
, BITS_PER_LONG
+ BITS_PER_BYTE
, bits
);
1046 static void kasan_bitops_tags(struct kunit
*test
)
1050 /* This test is specifically crafted for tag-based modes. */
1051 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_KASAN_GENERIC
);
1053 /* kmalloc-64 cache will be used and the last 16 bytes will be the redzone. */
1054 bits
= kzalloc(48, GFP_KERNEL
);
1055 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, bits
);
1057 /* Do the accesses past the 48 allocated bytes, but within the redone. */
1058 kasan_bitops_modify(test
, BITS_PER_LONG
, (void *)bits
+ 48);
1059 kasan_bitops_test_and_modify(test
, BITS_PER_LONG
+ BITS_PER_BYTE
, (void *)bits
+ 48);
1064 static void kmalloc_double_kzfree(struct kunit
*test
)
1069 ptr
= kmalloc(size
, GFP_KERNEL
);
1070 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
1072 kfree_sensitive(ptr
);
1073 KUNIT_EXPECT_KASAN_FAIL(test
, kfree_sensitive(ptr
));
1076 static void vmalloc_helpers_tags(struct kunit
*test
)
1080 /* This test is intended for tag-based modes. */
1081 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_KASAN_GENERIC
);
1083 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_VMALLOC
);
1085 ptr
= vmalloc(PAGE_SIZE
);
1086 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
1088 /* Check that the returned pointer is tagged. */
1089 KUNIT_EXPECT_GE(test
, (u8
)get_tag(ptr
), (u8
)KASAN_TAG_MIN
);
1090 KUNIT_EXPECT_LT(test
, (u8
)get_tag(ptr
), (u8
)KASAN_TAG_KERNEL
);
1092 /* Make sure exported vmalloc helpers handle tagged pointers. */
1093 KUNIT_ASSERT_TRUE(test
, is_vmalloc_addr(ptr
));
1094 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, vmalloc_to_page(ptr
));
1096 #if !IS_MODULE(CONFIG_KASAN_KUNIT_TEST)
1100 /* Make sure vmalloc'ed memory permissions can be changed. */
1101 rv
= set_memory_ro((unsigned long)ptr
, 1);
1102 KUNIT_ASSERT_GE(test
, rv
, 0);
1103 rv
= set_memory_rw((unsigned long)ptr
, 1);
1104 KUNIT_ASSERT_GE(test
, rv
, 0);
1111 static void vmalloc_oob(struct kunit
*test
)
1113 char *v_ptr
, *p_ptr
;
1115 size_t size
= PAGE_SIZE
/ 2 - KASAN_GRANULE_SIZE
- 5;
1117 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_VMALLOC
);
1119 v_ptr
= vmalloc(size
);
1120 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, v_ptr
);
1122 OPTIMIZER_HIDE_VAR(v_ptr
);
1125 * We have to be careful not to hit the guard page in vmalloc tests.
1126 * The MMU will catch that and crash us.
1129 /* Make sure in-bounds accesses are valid. */
1131 v_ptr
[size
- 1] = 0;
1134 * An unaligned access past the requested vmalloc size.
1135 * Only generic KASAN can precisely detect these.
1137 if (IS_ENABLED(CONFIG_KASAN_GENERIC
))
1138 KUNIT_EXPECT_KASAN_FAIL(test
, ((volatile char *)v_ptr
)[size
]);
1140 /* An aligned access into the first out-of-bounds granule. */
1141 KUNIT_EXPECT_KASAN_FAIL(test
, ((volatile char *)v_ptr
)[size
+ 5]);
1143 /* Check that in-bounds accesses to the physical page are valid. */
1144 page
= vmalloc_to_page(v_ptr
);
1145 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, page
);
1146 p_ptr
= page_address(page
);
1147 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, p_ptr
);
1153 * We can't check for use-after-unmap bugs in this nor in the following
1154 * vmalloc tests, as the page might be fully unmapped and accessing it
1155 * will crash the kernel.
1159 static void vmap_tags(struct kunit
*test
)
1161 char *p_ptr
, *v_ptr
;
1162 struct page
*p_page
, *v_page
;
1165 * This test is specifically crafted for the software tag-based mode,
1166 * the only tag-based mode that poisons vmap mappings.
1168 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_SW_TAGS
);
1170 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_VMALLOC
);
1172 p_page
= alloc_pages(GFP_KERNEL
, 1);
1173 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, p_page
);
1174 p_ptr
= page_address(p_page
);
1175 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, p_ptr
);
1177 v_ptr
= vmap(&p_page
, 1, VM_MAP
, PAGE_KERNEL
);
1178 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, v_ptr
);
1181 * We can't check for out-of-bounds bugs in this nor in the following
1182 * vmalloc tests, as allocations have page granularity and accessing
1183 * the guard page will crash the kernel.
1186 KUNIT_EXPECT_GE(test
, (u8
)get_tag(v_ptr
), (u8
)KASAN_TAG_MIN
);
1187 KUNIT_EXPECT_LT(test
, (u8
)get_tag(v_ptr
), (u8
)KASAN_TAG_KERNEL
);
1189 /* Make sure that in-bounds accesses through both pointers work. */
1193 /* Make sure vmalloc_to_page() correctly recovers the page pointer. */
1194 v_page
= vmalloc_to_page(v_ptr
);
1195 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, v_page
);
1196 KUNIT_EXPECT_PTR_EQ(test
, p_page
, v_page
);
1199 free_pages((unsigned long)p_ptr
, 1);
1202 static void vm_map_ram_tags(struct kunit
*test
)
1204 char *p_ptr
, *v_ptr
;
1208 * This test is specifically crafted for the software tag-based mode,
1209 * the only tag-based mode that poisons vm_map_ram mappings.
1211 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_SW_TAGS
);
1213 page
= alloc_pages(GFP_KERNEL
, 1);
1214 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, page
);
1215 p_ptr
= page_address(page
);
1216 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, p_ptr
);
1218 v_ptr
= vm_map_ram(&page
, 1, -1);
1219 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, v_ptr
);
1221 KUNIT_EXPECT_GE(test
, (u8
)get_tag(v_ptr
), (u8
)KASAN_TAG_MIN
);
1222 KUNIT_EXPECT_LT(test
, (u8
)get_tag(v_ptr
), (u8
)KASAN_TAG_KERNEL
);
1224 /* Make sure that in-bounds accesses through both pointers work. */
1228 vm_unmap_ram(v_ptr
, 1);
1229 free_pages((unsigned long)p_ptr
, 1);
1232 static void vmalloc_percpu(struct kunit
*test
)
1238 * This test is specifically crafted for the software tag-based mode,
1239 * the only tag-based mode that poisons percpu mappings.
1241 KASAN_TEST_NEEDS_CONFIG_ON(test
, CONFIG_KASAN_SW_TAGS
);
1243 ptr
= __alloc_percpu(PAGE_SIZE
, PAGE_SIZE
);
1245 for_each_possible_cpu(cpu
) {
1246 char *c_ptr
= per_cpu_ptr(ptr
, cpu
);
1248 KUNIT_EXPECT_GE(test
, (u8
)get_tag(c_ptr
), (u8
)KASAN_TAG_MIN
);
1249 KUNIT_EXPECT_LT(test
, (u8
)get_tag(c_ptr
), (u8
)KASAN_TAG_KERNEL
);
1251 /* Make sure that in-bounds accesses don't crash the kernel. */
1259 * Check that the assigned pointer tag falls within the [KASAN_TAG_MIN,
1260 * KASAN_TAG_KERNEL) range (note: excluding the match-all tag) for tag-based
1263 static void match_all_not_assigned(struct kunit
*test
)
1269 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_KASAN_GENERIC
);
1271 for (i
= 0; i
< 256; i
++) {
1272 size
= (get_random_int() % 1024) + 1;
1273 ptr
= kmalloc(size
, GFP_KERNEL
);
1274 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
1275 KUNIT_EXPECT_GE(test
, (u8
)get_tag(ptr
), (u8
)KASAN_TAG_MIN
);
1276 KUNIT_EXPECT_LT(test
, (u8
)get_tag(ptr
), (u8
)KASAN_TAG_KERNEL
);
1280 for (i
= 0; i
< 256; i
++) {
1281 order
= (get_random_int() % 4) + 1;
1282 pages
= alloc_pages(GFP_KERNEL
, order
);
1283 ptr
= page_address(pages
);
1284 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
1285 KUNIT_EXPECT_GE(test
, (u8
)get_tag(ptr
), (u8
)KASAN_TAG_MIN
);
1286 KUNIT_EXPECT_LT(test
, (u8
)get_tag(ptr
), (u8
)KASAN_TAG_KERNEL
);
1287 free_pages((unsigned long)ptr
, order
);
1290 if (!IS_ENABLED(CONFIG_KASAN_VMALLOC
))
1293 for (i
= 0; i
< 256; i
++) {
1294 size
= (get_random_int() % 1024) + 1;
1295 ptr
= vmalloc(size
);
1296 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
1297 KUNIT_EXPECT_GE(test
, (u8
)get_tag(ptr
), (u8
)KASAN_TAG_MIN
);
1298 KUNIT_EXPECT_LT(test
, (u8
)get_tag(ptr
), (u8
)KASAN_TAG_KERNEL
);
1303 /* Check that 0xff works as a match-all pointer tag for tag-based modes. */
1304 static void match_all_ptr_tag(struct kunit
*test
)
1309 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_KASAN_GENERIC
);
1311 ptr
= kmalloc(128, GFP_KERNEL
);
1312 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
1314 /* Backup the assigned tag. */
1316 KUNIT_EXPECT_NE(test
, tag
, (u8
)KASAN_TAG_KERNEL
);
1318 /* Reset the tag to 0xff.*/
1319 ptr
= set_tag(ptr
, KASAN_TAG_KERNEL
);
1321 /* This access shouldn't trigger a KASAN report. */
1324 /* Recover the pointer tag and free. */
1325 ptr
= set_tag(ptr
, tag
);
1329 /* Check that there are no match-all memory tags for tag-based modes. */
1330 static void match_all_mem_tag(struct kunit
*test
)
1335 KASAN_TEST_NEEDS_CONFIG_OFF(test
, CONFIG_KASAN_GENERIC
);
1337 ptr
= kmalloc(128, GFP_KERNEL
);
1338 KUNIT_ASSERT_NOT_ERR_OR_NULL(test
, ptr
);
1339 KUNIT_EXPECT_NE(test
, (u8
)get_tag(ptr
), (u8
)KASAN_TAG_KERNEL
);
1341 /* For each possible tag value not matching the pointer tag. */
1342 for (tag
= KASAN_TAG_MIN
; tag
<= KASAN_TAG_KERNEL
; tag
++) {
1343 if (tag
== get_tag(ptr
))
1346 /* Mark the first memory granule with the chosen memory tag. */
1347 kasan_poison(ptr
, KASAN_GRANULE_SIZE
, (u8
)tag
, false);
1349 /* This access must cause a KASAN report. */
1350 KUNIT_EXPECT_KASAN_FAIL(test
, *ptr
= 0);
1353 /* Recover the memory tag and free. */
1354 kasan_poison(ptr
, KASAN_GRANULE_SIZE
, get_tag(ptr
), false);
1358 static struct kunit_case kasan_kunit_test_cases
[] = {
1359 KUNIT_CASE(kmalloc_oob_right
),
1360 KUNIT_CASE(kmalloc_oob_left
),
1361 KUNIT_CASE(kmalloc_node_oob_right
),
1362 KUNIT_CASE(kmalloc_pagealloc_oob_right
),
1363 KUNIT_CASE(kmalloc_pagealloc_uaf
),
1364 KUNIT_CASE(kmalloc_pagealloc_invalid_free
),
1365 KUNIT_CASE(pagealloc_oob_right
),
1366 KUNIT_CASE(pagealloc_uaf
),
1367 KUNIT_CASE(kmalloc_large_oob_right
),
1368 KUNIT_CASE(krealloc_more_oob
),
1369 KUNIT_CASE(krealloc_less_oob
),
1370 KUNIT_CASE(krealloc_pagealloc_more_oob
),
1371 KUNIT_CASE(krealloc_pagealloc_less_oob
),
1372 KUNIT_CASE(krealloc_uaf
),
1373 KUNIT_CASE(kmalloc_oob_16
),
1374 KUNIT_CASE(kmalloc_uaf_16
),
1375 KUNIT_CASE(kmalloc_oob_in_memset
),
1376 KUNIT_CASE(kmalloc_oob_memset_2
),
1377 KUNIT_CASE(kmalloc_oob_memset_4
),
1378 KUNIT_CASE(kmalloc_oob_memset_8
),
1379 KUNIT_CASE(kmalloc_oob_memset_16
),
1380 KUNIT_CASE(kmalloc_memmove_negative_size
),
1381 KUNIT_CASE(kmalloc_memmove_invalid_size
),
1382 KUNIT_CASE(kmalloc_uaf
),
1383 KUNIT_CASE(kmalloc_uaf_memset
),
1384 KUNIT_CASE(kmalloc_uaf2
),
1385 KUNIT_CASE(kfree_via_page
),
1386 KUNIT_CASE(kfree_via_phys
),
1387 KUNIT_CASE(kmem_cache_oob
),
1388 KUNIT_CASE(kmem_cache_accounted
),
1389 KUNIT_CASE(kmem_cache_bulk
),
1390 KUNIT_CASE(kasan_global_oob_right
),
1391 KUNIT_CASE(kasan_global_oob_left
),
1392 KUNIT_CASE(kasan_stack_oob
),
1393 KUNIT_CASE(kasan_alloca_oob_left
),
1394 KUNIT_CASE(kasan_alloca_oob_right
),
1395 KUNIT_CASE(ksize_unpoisons_memory
),
1396 KUNIT_CASE(ksize_uaf
),
1397 KUNIT_CASE(kmem_cache_double_free
),
1398 KUNIT_CASE(kmem_cache_invalid_free
),
1399 KUNIT_CASE(kmem_cache_double_destroy
),
1400 KUNIT_CASE(kasan_memchr
),
1401 KUNIT_CASE(kasan_memcmp
),
1402 KUNIT_CASE(kasan_strings
),
1403 KUNIT_CASE(kasan_bitops_generic
),
1404 KUNIT_CASE(kasan_bitops_tags
),
1405 KUNIT_CASE(kmalloc_double_kzfree
),
1406 KUNIT_CASE(vmalloc_helpers_tags
),
1407 KUNIT_CASE(vmalloc_oob
),
1408 KUNIT_CASE(vmap_tags
),
1409 KUNIT_CASE(vm_map_ram_tags
),
1410 KUNIT_CASE(vmalloc_percpu
),
1411 KUNIT_CASE(match_all_not_assigned
),
1412 KUNIT_CASE(match_all_ptr_tag
),
1413 KUNIT_CASE(match_all_mem_tag
),
1417 static struct kunit_suite kasan_kunit_test_suite
= {
1419 .init
= kasan_test_init
,
1420 .test_cases
= kasan_kunit_test_cases
,
1421 .exit
= kasan_test_exit
,
1424 kunit_test_suite(kasan_kunit_test_suite
);
1426 MODULE_LICENSE("GPL");