The patch titled
Subject: mm/mempool: Avoid KASAN marking mempool posion checks as use-after-free
has been added to the -mm tree. Its filename is
mm-mempool-avoid-kasan-marking-mempool-posion-checks-as-use-after-free.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mempool-avoid-kasan-marking-mempool-posion-checks-as-use-after-free.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mempool-avoid-kasan-marking-mempool-posion-checks-as-use-after-free.patch
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------------------------------------------------------
From: Matthew Dawson <matthew@xxxxxxxxxxxxx>
Subject: mm/mempool: Avoid KASAN marking mempool posion checks as use-after-free
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@xxxxxxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/mempool.c~mm-mempool-avoid-kasan-marking-mempool-posion-checks-as-use-after-free mm/mempool.c
--- a/mm/mempool.c~mm-mempool-avoid-kasan-marking-mempool-posion-checks-as-use-after-free
+++ a/mm/mempool.c
@@ -135,8 +135,8 @@ static void *remove_element(mempool_t *p
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;
}
_
Patches currently in -mm which might be from matthew@xxxxxxxxxxxxx are
mm-mempool-avoid-kasan-marking-mempool-posion-checks-as-use-after-free.patch
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