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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>
This commit is contained in:
Andrey Konovalov 2021-09-02 14:57:53 -07:00 committed by Linus Torvalds
parent 756e5a47a5
commit f16de0bcdb
1 changed files with 1 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

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); struct kasan_rcu_info, rcu);
kfree(fp); kfree(fp);
fp->i = 1; ((volatile struct kasan_rcu_info *)fp)->i;
} }
static noinline void __init kasan_rcu_uaf(void) static noinline void __init kasan_rcu_uaf(void)