tree 4a78fc384c220efad52d250b49795b535fbc2db0
parent bda6d33042a486c8f7b15bf15a80fd07d4eab204
author Andrey Ryabinin <a.ryabinin@samsung.com> 1429139705 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1429140920 -0700

mm/mempool.c: kasan: poison mempool elements

Mempools keep allocated objects in reserved for situations when ordinary
allocation may not be possible to satisfy.  These objects shouldn't be
accessed before they leave the pool.

This patch poison elements when get into the pool and unpoison when they
leave it.  This will let KASan to detect use-after-free of mempool's
elements.

Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Tested-by: David Rientjes <rientjes@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Chernenkov <drcheren@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>