diff options
Diffstat (limited to 'lib/test_kasan.c')
| -rw-r--r-- | lib/test_kasan.c | 424 |
1 files changed, 309 insertions, 115 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 2947274cc2d3..25576303897b 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -13,6 +13,7 @@ #include <linux/mman.h> #include <linux/module.h> #include <linux/printk.h> +#include <linux/random.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/uaccess.h> @@ -28,10 +29,9 @@ #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE) /* - * We assign some test results to these globals to make sure the tests - * are not eliminated as dead code. + * Some tests use these global variables to store return values from function + * calls that could otherwise be eliminated by the compiler as dead code. */ - void *kasan_ptr_result; int kasan_int_result; @@ -39,40 +39,81 @@ static struct kunit_resource resource; static struct kunit_kasan_expectation fail_data; static bool multishot; +/* + * Temporarily enable multi-shot mode. Otherwise, KASAN would only report the + * first detected bug and panic the kernel if panic_on_warn is enabled. For + * hardware tag-based KASAN also allow tag checking to be reenabled for each + * test, see the comment for KUNIT_EXPECT_KASAN_FAIL(). + */ static int kasan_test_init(struct kunit *test) { - /* - * Temporarily enable multi-shot mode and set panic_on_warn=0. - * Otherwise, we'd only get a report for the first case. - */ - multishot = kasan_save_enable_multi_shot(); + if (!kasan_enabled()) { + kunit_err(test, "can't run KASAN tests with KASAN disabled"); + return -1; + } + multishot = kasan_save_enable_multi_shot(); + kasan_set_tagging_report_once(false); return 0; } static void kasan_test_exit(struct kunit *test) { + kasan_set_tagging_report_once(true); kasan_restore_multi_shot(multishot); } /** - * KUNIT_EXPECT_KASAN_FAIL() - Causes a test failure when the expression does - * not cause a KASAN error. This uses a KUnit resource named "kasan_data." Do - * Do not use this name for a KUnit resource outside here. + * KUNIT_EXPECT_KASAN_FAIL() - check that the executed expression produces a + * KASAN report; causes a test failure otherwise. This relies on a KUnit + * resource named "kasan_data". Do not use this name for KUnit resources + * outside of KASAN tests. * + * For hardware tag-based KASAN, when a tag fault happens, tag checking is + * normally auto-disabled. When this happens, this test handler reenables + * tag checking. As tag checking can be only disabled or enabled per CPU, this + * handler disables migration (preemption). + * + * Since the compiler doesn't see that the expression can change the fail_data + * fields, it can reorder or optimize away the accesses to those fields. + * Use READ/WRITE_ONCE() for the accesses and compiler barriers around the + * expression to prevent that. */ -#define KUNIT_EXPECT_KASAN_FAIL(test, condition) do { \ - fail_data.report_expected = true; \ - fail_data.report_found = false; \ - kunit_add_named_resource(test, \ - NULL, \ - NULL, \ - &resource, \ - "kasan_data", &fail_data); \ - condition; \ - KUNIT_EXPECT_EQ(test, \ - fail_data.report_expected, \ - fail_data.report_found); \ +#define KUNIT_EXPECT_KASAN_FAIL(test, expression) do { \ + if (IS_ENABLED(CONFIG_KASAN_HW_TAGS)) \ + migrate_disable(); \ + WRITE_ONCE(fail_data.report_expected, true); \ + WRITE_ONCE(fail_data.report_found, false); \ + kunit_add_named_resource(test, \ + NULL, \ + NULL, \ + &resource, \ + "kasan_data", &fail_data); \ + barrier(); \ + expression; \ + barrier(); \ + KUNIT_EXPECT_EQ(test, \ + READ_ONCE(fail_data.report_expected), \ + READ_ONCE(fail_data.report_found)); \ + if (IS_ENABLED(CONFIG_KASAN_HW_TAGS)) { \ + if (READ_ONCE(fail_data.report_found)) \ + kasan_enable_tagging(); \ + migrate_enable(); \ + } \ +} while (0) + +#define KASAN_TEST_NEEDS_CONFIG_ON(test, config) do { \ + if (!IS_ENABLED(config)) { \ + kunit_info((test), "skipping, " #config " required"); \ + return; \ + } \ +} while (0) + +#define KASAN_TEST_NEEDS_CONFIG_OFF(test, config) do { \ + if (IS_ENABLED(config)) { \ + kunit_info((test), "skipping, " #config " enabled"); \ + return; \ + } \ } while (0) static void kmalloc_oob_right(struct kunit *test) @@ -111,23 +152,24 @@ static void kmalloc_node_oob_right(struct kunit *test) kfree(ptr); } +/* + * These kmalloc_pagealloc_* tests try allocating a memory chunk that doesn't + * fit into a slab cache and therefore is allocated via the page allocator + * fallback. Since this kind of fallback is only implemented for SLUB, these + * tests are limited to that allocator. + */ static void kmalloc_pagealloc_oob_right(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10; - if (!IS_ENABLED(CONFIG_SLUB)) { - kunit_info(test, "CONFIG_SLUB is not enabled."); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); - /* Allocate a chunk that does not fit into a SLUB cache to trigger - * the page allocator fallback. - */ ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0); + kfree(ptr); } @@ -136,15 +178,12 @@ static void kmalloc_pagealloc_uaf(struct kunit *test) char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10; - if (!IS_ENABLED(CONFIG_SLUB)) { - kunit_info(test, "CONFIG_SLUB is not enabled."); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); - kfree(ptr); + KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0); } @@ -153,10 +192,7 @@ static void kmalloc_pagealloc_invalid_free(struct kunit *test) char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10; - if (!IS_ENABLED(CONFIG_SLUB)) { - kunit_info(test, "CONFIG_SLUB is not enabled."); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); @@ -164,11 +200,49 @@ static void kmalloc_pagealloc_invalid_free(struct kunit *test) KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1)); } +static void pagealloc_oob_right(struct kunit *test) +{ + char *ptr; + struct page *pages; + size_t order = 4; + size_t size = (1UL << (PAGE_SHIFT + order)); + + /* + * With generic KASAN page allocations have no redzones, thus + * out-of-bounds detection is not guaranteed. + * See https://bugzilla.kernel.org/show_bug.cgi?id=210503. + */ + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); + + pages = alloc_pages(GFP_KERNEL, order); + ptr = page_address(pages); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); + free_pages((unsigned long)ptr, order); +} + +static void pagealloc_uaf(struct kunit *test) +{ + char *ptr; + struct page *pages; + size_t order = 4; + + pages = alloc_pages(GFP_KERNEL, order); + ptr = page_address(pages); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + free_pages((unsigned long)ptr, order); + + KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0); +} + static void kmalloc_large_oob_right(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE - 256; - /* Allocate a chunk that is large enough, but still fits into a slab + + /* + * Allocate a chunk that is large enough, but still fits into a slab * and does not trigger the page allocator fallback in SLUB. */ ptr = kmalloc(size, GFP_KERNEL); @@ -217,10 +291,7 @@ static void kmalloc_oob_16(struct kunit *test) } *ptr1, *ptr2; /* This test is specifically crafted for the generic mode. */ - if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) { - kunit_info(test, "CONFIG_KASAN_GENERIC required\n"); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); @@ -355,7 +426,9 @@ static void kmalloc_uaf2(struct kunit *test) { char *ptr1, *ptr2; size_t size = 43; + int counter = 0; +again: ptr1 = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); @@ -364,6 +437,15 @@ static void kmalloc_uaf2(struct kunit *test) ptr2 = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); + /* + * For tag-based KASAN ptr1 and ptr2 tags might happen to be the same. + * Allow up to 16 attempts at generating different tags. + */ + if (!IS_ENABLED(CONFIG_KASAN_GENERIC) && ptr1 == ptr2 && counter++ < 16) { + kfree(ptr2); + goto again; + } + KUNIT_EXPECT_KASAN_FAIL(test, ptr1[40] = 'x'); KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2); @@ -402,10 +484,11 @@ static void kmem_cache_oob(struct kunit *test) { char *p; size_t size = 200; - struct kmem_cache *cache = kmem_cache_create("test_cache", - size, 0, - 0, NULL); + struct kmem_cache *cache; + + cache = kmem_cache_create("test_cache", size, 0, 0, NULL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); + p = kmem_cache_alloc(cache, GFP_KERNEL); if (!p) { kunit_err(test, "Allocation failed: %s\n", __func__); @@ -414,11 +497,12 @@ static void kmem_cache_oob(struct kunit *test) } KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]); + kmem_cache_free(cache, p); kmem_cache_destroy(cache); } -static void memcg_accounted_kmem_cache(struct kunit *test) +static void kmem_cache_accounted(struct kunit *test) { int i; char *p; @@ -445,6 +529,31 @@ free_cache: kmem_cache_destroy(cache); } +static void kmem_cache_bulk(struct kunit *test) +{ + struct kmem_cache *cache; + size_t size = 200; + char *p[10]; + bool ret; + int i; + + cache = kmem_cache_create("test_cache", size, 0, 0, NULL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); + + ret = kmem_cache_alloc_bulk(cache, GFP_KERNEL, ARRAY_SIZE(p), (void **)&p); + if (!ret) { + kunit_err(test, "Allocation failed: %s\n", __func__); + kmem_cache_destroy(cache); + return; + } + + for (i = 0; i < ARRAY_SIZE(p); i++) + p[i][0] = p[i][size - 1] = 42; + + kmem_cache_free_bulk(cache, ARRAY_SIZE(p), (void **)&p); + kmem_cache_destroy(cache); +} + static char global_array[10]; static void kasan_global_oob(struct kunit *test) @@ -453,14 +562,12 @@ static void kasan_global_oob(struct kunit *test) char *p = &global_array[ARRAY_SIZE(global_array) + i]; /* Only generic mode instruments globals. */ - if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) { - kunit_info(test, "CONFIG_KASAN_GENERIC required"); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); } +/* Check that ksize() makes the whole object accessible. */ static void ksize_unpoisons_memory(struct kunit *test) { char *ptr; @@ -469,11 +576,32 @@ static void ksize_unpoisons_memory(struct kunit *test) ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); real_size = ksize(ptr); - /* This access doesn't trigger an error. */ + + /* This access shouldn't trigger a KASAN report. */ ptr[size] = 'x'; - /* This one does. */ + + /* This one must. */ KUNIT_EXPECT_KASAN_FAIL(test, ptr[real_size] = 'y'); + + kfree(ptr); +} + +/* + * Check that a use-after-free is detected by ksize() and via normal accesses + * after it. + */ +static void ksize_uaf(struct kunit *test) +{ + char *ptr; + int size = 128 - KASAN_GRANULE_SIZE; + + ptr = kmalloc(size, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); kfree(ptr); + + KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr)); + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *ptr); + KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *(ptr + size)); } static void kasan_stack_oob(struct kunit *test) @@ -482,10 +610,7 @@ static void kasan_stack_oob(struct kunit *test) volatile int i = OOB_TAG_OFF; char *p = &stack_array[ARRAY_SIZE(stack_array) + i]; - if (!IS_ENABLED(CONFIG_KASAN_STACK)) { - kunit_info(test, "CONFIG_KASAN_STACK is not enabled"); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); } @@ -497,15 +622,8 @@ static void kasan_alloca_oob_left(struct kunit *test) char *p = alloca_array - 1; /* Only generic mode instruments dynamic allocas. */ - if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) { - kunit_info(test, "CONFIG_KASAN_GENERIC required"); - return; - } - - if (!IS_ENABLED(CONFIG_KASAN_STACK)) { - kunit_info(test, "CONFIG_KASAN_STACK is not enabled"); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); } @@ -517,15 +635,8 @@ static void kasan_alloca_oob_right(struct kunit *test) char *p = alloca_array + i; /* Only generic mode instruments dynamic allocas. */ - if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) { - kunit_info(test, "CONFIG_KASAN_GENERIC required"); - return; - } - - if (!IS_ENABLED(CONFIG_KASAN_STACK)) { - kunit_info(test, "CONFIG_KASAN_STACK is not enabled"); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK); KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); } @@ -568,7 +679,7 @@ static void kmem_cache_invalid_free(struct kunit *test) return; } - /* Trigger invalid free, the object doesn't get freed */ + /* Trigger invalid free, the object doesn't get freed. */ KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1)); /* @@ -585,12 +696,11 @@ static void kasan_memchr(struct kunit *test) char *ptr; size_t size = 24; - /* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */ - if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { - kunit_info(test, - "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT"); - return; - } + /* + * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. + * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. + */ + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); if (OOB_TAG_OFF) size = round_up(size, OOB_TAG_OFF); @@ -610,12 +720,11 @@ static void kasan_memcmp(struct kunit *test) size_t size = 24; int arr[9]; - /* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */ - if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { - kunit_info(test, - "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT"); - return; - } + /* + * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. + * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. + */ + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); if (OOB_TAG_OFF) size = round_up(size, OOB_TAG_OFF); @@ -634,12 +743,11 @@ static void kasan_strings(struct kunit *test) char *ptr; size_t size = 24; - /* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */ - if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { - kunit_info(test, - "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT"); - return; - } + /* + * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT. + * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details. + */ + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT); ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); @@ -700,13 +808,10 @@ static void kasan_bitops_generic(struct kunit *test) long *bits; /* This test is specifically crafted for the generic mode. */ - if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) { - kunit_info(test, "CONFIG_KASAN_GENERIC required\n"); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); /* - * Allocate 1 more byte, which causes kzalloc to round up to 16-bytes; + * Allocate 1 more byte, which causes kzalloc to round up to 16 bytes; * this way we do not actually corrupt other memory. */ bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL); @@ -731,19 +836,16 @@ static void kasan_bitops_tags(struct kunit *test) { long *bits; - /* This test is specifically crafted for the tag-based mode. */ - if (IS_ENABLED(CONFIG_KASAN_GENERIC)) { - kunit_info(test, "CONFIG_KASAN_SW_TAGS required\n"); - return; - } + /* This test is specifically crafted for tag-based modes. */ + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); - /* Allocation size will be rounded to up granule size, which is 16. */ - bits = kzalloc(sizeof(*bits), GFP_KERNEL); + /* kmalloc-64 cache will be used and the last 16 bytes will be the redzone. */ + bits = kzalloc(48, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); - /* Do the accesses past the 16 allocated bytes. */ - kasan_bitops_modify(test, BITS_PER_LONG, &bits[1]); - kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, &bits[1]); + /* Do the accesses past the 48 allocated bytes, but within the redone. */ + kasan_bitops_modify(test, BITS_PER_LONG, (void *)bits + 48); + kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, (void *)bits + 48); kfree(bits); } @@ -764,10 +866,7 @@ static void vmalloc_oob(struct kunit *test) { void *area; - if (!IS_ENABLED(CONFIG_KASAN_VMALLOC)) { - kunit_info(test, "CONFIG_KASAN_VMALLOC is not enabled."); - return; - } + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); /* * We have to be careful not to hit the guard page. @@ -780,6 +879,94 @@ static void vmalloc_oob(struct kunit *test) vfree(area); } +/* + * Check that the assigned pointer tag falls within the [KASAN_TAG_MIN, + * KASAN_TAG_KERNEL) range (note: excluding the match-all tag) for tag-based + * modes. + */ +static void match_all_not_assigned(struct kunit *test) +{ + char *ptr; + struct page *pages; + int i, size, order; + + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); + + for (i = 0; i < 256; i++) { + size = (get_random_int() % 1024) + 1; + ptr = kmalloc(size, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); + KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); + kfree(ptr); + } + + for (i = 0; i < 256; i++) { + order = (get_random_int() % 4) + 1; + pages = alloc_pages(GFP_KERNEL, order); + ptr = page_address(pages); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); + KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); + free_pages((unsigned long)ptr, order); + } +} + +/* Check that 0xff works as a match-all pointer tag for tag-based modes. */ +static void match_all_ptr_tag(struct kunit *test) +{ + char *ptr; + u8 tag; + + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); + + ptr = kmalloc(128, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + + /* Backup the assigned tag. */ + tag = get_tag(ptr); + KUNIT_EXPECT_NE(test, tag, (u8)KASAN_TAG_KERNEL); + + /* Reset the tag to 0xff.*/ + ptr = set_tag(ptr, KASAN_TAG_KERNEL); + + /* This access shouldn't trigger a KASAN report. */ + *ptr = 0; + + /* Recover the pointer tag and free. */ + ptr = set_tag(ptr, tag); + kfree(ptr); +} + +/* Check that there are no match-all memory tags for tag-based modes. */ +static void match_all_mem_tag(struct kunit *test) +{ + char *ptr; + int tag; + + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); + + ptr = kmalloc(128, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); + KUNIT_EXPECT_NE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); + + /* For each possible tag value not matching the pointer tag. */ + for (tag = KASAN_TAG_MIN; tag <= KASAN_TAG_KERNEL; tag++) { + if (tag == get_tag(ptr)) + continue; + + /* Mark the first memory granule with the chosen memory tag. */ + kasan_poison(ptr, KASAN_GRANULE_SIZE, (u8)tag); + + /* This access must cause a KASAN report. */ + KUNIT_EXPECT_KASAN_FAIL(test, *ptr = 0); + } + + /* Recover the memory tag and free. */ + kasan_poison(ptr, KASAN_GRANULE_SIZE, get_tag(ptr)); + kfree(ptr); +} + static struct kunit_case kasan_kunit_test_cases[] = { KUNIT_CASE(kmalloc_oob_right), KUNIT_CASE(kmalloc_oob_left), @@ -787,6 +974,8 @@ static struct kunit_case kasan_kunit_test_cases[] = { KUNIT_CASE(kmalloc_pagealloc_oob_right), KUNIT_CASE(kmalloc_pagealloc_uaf), KUNIT_CASE(kmalloc_pagealloc_invalid_free), + KUNIT_CASE(pagealloc_oob_right), + KUNIT_CASE(pagealloc_uaf), KUNIT_CASE(kmalloc_large_oob_right), KUNIT_CASE(kmalloc_oob_krealloc_more), KUNIT_CASE(kmalloc_oob_krealloc_less), @@ -804,12 +993,14 @@ static struct kunit_case kasan_kunit_test_cases[] = { KUNIT_CASE(kfree_via_page), KUNIT_CASE(kfree_via_phys), KUNIT_CASE(kmem_cache_oob), - KUNIT_CASE(memcg_accounted_kmem_cache), + KUNIT_CASE(kmem_cache_accounted), + KUNIT_CASE(kmem_cache_bulk), KUNIT_CASE(kasan_global_oob), KUNIT_CASE(kasan_stack_oob), KUNIT_CASE(kasan_alloca_oob_left), KUNIT_CASE(kasan_alloca_oob_right), KUNIT_CASE(ksize_unpoisons_memory), + KUNIT_CASE(ksize_uaf), KUNIT_CASE(kmem_cache_double_free), KUNIT_CASE(kmem_cache_invalid_free), KUNIT_CASE(kasan_memchr), @@ -819,6 +1010,9 @@ static struct kunit_case kasan_kunit_test_cases[] = { KUNIT_CASE(kasan_bitops_tags), KUNIT_CASE(kmalloc_double_kzfree), KUNIT_CASE(vmalloc_oob), + KUNIT_CASE(match_all_not_assigned), + KUNIT_CASE(match_all_ptr_tag), + KUNIT_CASE(match_all_mem_tag), {} }; 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