From: Matthew Dawson <matthew@mjdsystems.ca>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] mm/mempool: Avoid KASAN marking mempool posion checks as use-after-free
Date: Wed, 9 Mar 2016 01:16:19 -0500 [thread overview]
Message-ID: <1457504179-18942-1-git-send-email-matthew@mjdsystems.ca> (raw)
When removing an element from the mempool, mark it as unpoisoned in KASAN
before verifying its contents for SLUB/SLAB debugging. Otherwise KASAN
will flag the reads checking the element use-after-free writes as
use-after-free reads.
Signed-off-by: Matthew Dawson <matthew@mjdsystems.ca>
---
mm/mempool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/mempool.c b/mm/mempool.c
index 004d42b..7924f4f 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -135,8 +135,8 @@ static void *remove_element(mempool_t *pool)
void *element = pool->elements[--pool->curr_nr];
BUG_ON(pool->curr_nr < 0);
- check_element(pool, element);
kasan_unpoison_element(pool, element);
+ check_element(pool, element);
return element;
}
--
2.7.1
--
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next reply other threads:[~2016-03-09 6:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-09 6:16 Matthew Dawson [this message]
2016-03-10 13:55 ` [PATCH] mm/mempool: Avoid KASAN marking mempool posion checks as use-after-free Andrey Ryabinin
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