Messages in this thread Patch in this message | | | From | andrey.konovalov@linux ... | Subject | [PATCH v2 4/8] kasan: test: disable kmalloc_memmove_invalid_size for HW_TAGS | Date | Thu, 12 Aug 2021 16:53:31 +0200 |
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From: Andrey Konovalov <andreyknvl@gmail.com>
The HW_TAGS mode doesn't check memmove for negative size. As a result, the kmalloc_memmove_invalid_size test corrupts memory, which can result in a crash.
Disable this test with HW_TAGS KASAN.
Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com> --- lib/test_kasan.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c index db73bc9e3fa2..1f533a7346d9 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -501,11 +501,17 @@ static void kmalloc_memmove_invalid_size(struct kunit *test) size_t size = 64; volatile size_t invalid_size = -2; + /* + * Hardware tag-based mode doesn't check memmove for negative size. + * As a result, this test introduces a side-effect memory corruption, + * which can result in a crash. + */ + KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_HW_TAGS); + ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); memset((char *)ptr, 0, 64); - KUNIT_EXPECT_KASAN_FAIL(test, memmove((char *)ptr, (char *)ptr + 4, invalid_size)); kfree(ptr); -- 2.25.1
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