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| author | Andrey Konovalov <andreyknvl@gmail.com> | 2021-09-03 00:57:53 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-09-03 19:58:15 +0300 |
| commit | f16de0bcdb55bf18e2533ca625f3e4b4952f254c (patch) | |
| tree | 154d330c2fc2ccec05d47e93b90c14e4b334b610 | |
| parent | 756e5a47a5ddf0caa3708f922385a92af9d330b5 (diff) | |
| download | linux-f16de0bcdb55bf18e2533ca625f3e4b4952f254c.tar.xz | |
kasan: test: avoid corrupting memory in kasan_rcu_uaf
kasan_rcu_uaf() writes to freed memory via kasan_rcu_reclaim(), 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.
Turn the write into a read.
Link: https://lkml.kernel.org/r/b6f2c3bf712d2457c783fa59498225b66a634f62.1628779805.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>
| -rw-r--r-- | lib/test_kasan_module.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/test_kasan_module.c b/lib/test_kasan_module.c index fa73b9df0be4..7ebf433edef3 100644 --- a/lib/test_kasan_module.c +++ b/lib/test_kasan_module.c @@ -71,7 +71,7 @@ static noinline void __init kasan_rcu_reclaim(struct rcu_head *rp) struct kasan_rcu_info, rcu); kfree(fp); - fp->i = 1; + ((volatile struct kasan_rcu_info *)fp)->i; } static noinline void __init kasan_rcu_uaf(void) |