From: Andrey Konovalov <andreyknvl@xxxxxxxxx> Subject: kasan: test: only do kmalloc_uaf_memset for generic mode kmalloc_uaf_memset() writes to freed memory, which is only safe with the GENERIC mode (as it uses quarantine). For other modes, this test corrupts kernel memory, which might result in a crash. Only enable kmalloc_uaf_memset() for the GENERIC mode. Link: https://lkml.kernel.org/r/2e1c87b607b1292556cde3cab2764f108542b60c.1628779805.git.andreyknvl@xxxxxxxxx Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxx> Reviewed-by: Marco Elver <elver@xxxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/test_kasan.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/lib/test_kasan.c~kasan-test-only-do-kmalloc_uaf_memset-for-generic-mode +++ a/lib/test_kasan.c @@ -534,6 +534,12 @@ static void kmalloc_uaf_memset(struct ku char *ptr; size_t size = 33; + /* + * Only generic KASAN uses quarantine, which is required to avoid a + * kernel memory corruption this test causes. + */ + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); + ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); _
