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authorAndrey Konovalov <andreyknvl@gmail.com>2021-09-03 00:57:44 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-03 19:58:14 +0300
commit25b12a58e848459ae2dbf2e7d318ef168bd1c5e2 (patch)
tree12931101e63a52c027d84976f4e13311d169f464 /lib/test_kasan.c
parent1b0668be62cfa394903bb368641c80533bf42d5a (diff)
downloadlinux-25b12a58e848459ae2dbf2e7d318ef168bd1c5e2.tar.xz
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@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>
Diffstat (limited to 'lib/test_kasan.c')
-rw-r--r--lib/test_kasan.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 1f533a7346d9..1dcba6dbfc97 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -534,6 +534,12 @@ static void kmalloc_uaf_memset(struct kunit *test)
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);