Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.14 95/99] kasan: test: disable kmalloc_memmove_invalid_size for HW_TAGS | Date | Thu, 9 Sep 2021 20:15:54 -0400 |
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From: Andrey Konovalov <andreyknvl@gmail.com>
[ Upstream commit 1b0668be62cfa394903bb368641c80533bf42d5a ]
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.
Link: https://lkml.kernel.org/r/088733a06ac21eba29aa85b6f769d2abd74f9638.1628779805.git.andreyknvl@gmail.com Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com> Reviewed-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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 b298edb325ab..c149675300bd 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -485,11 +485,17 @@ 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); -- 2.30.2
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