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UPSTREAM: kasan: test: avoid corrupting memory in kasan_rcu_uaf

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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>
(cherry picked from commit f16de0bcdb)
Bug: 217222520
Change-Id: Ifcec3562271b04181a72e1362387de4975f49efb
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
This commit is contained in:
Andrey Konovalov
2021-09-02 14:57:53 -07:00
committed by Andrey Konovalov
parent 78434e3397
commit 73a526b100
1 changed files with 1 additions and 1 deletions
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2
lib/test_kasan_module.c
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@@ -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)