Messages in this thread Patch in this message | | | Date | Mon, 24 Apr 2006 16:33:37 +0800 | From | Akinobu Mita <> | Subject | [patch 4/4] change slab poison pattern |
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kref debugging cannot detect kref_put() with unreferenced object, when the structure including kref is allocated by slab and slab debugging config is enabled.
Because use-after-free poisoning make kref counter signed value. So this patch prevents it by changing poisoning pattern.
Signed-off-by: Akinobu Mita <mita@miraclelinux.com> CC: Matt Mackall <mpm@selenic.com> CC: Manfred Spraul <manfred@colorfullife.com> CC: Pekka J Enberg <penberg@cs.helsinki.fi>
mm/slab.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-)
Index: 2.6-git/mm/slab.c =================================================================== --- 2.6-git.orig/mm/slab.c +++ 2.6-git/mm/slab.c @@ -503,9 +503,9 @@ struct kmem_cache { #define RED_ACTIVE 0x170FC2A5UL /* when obj is active */ /* ...and for poisoning */ -#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ -#define POISON_FREE 0x6b /* for use-after-free poisoning */ -#define POISON_END 0xa5 /* end-byte of poisoning */ +#define POISON_INUSE 0xa5 /* for use-uninitialised poisoning */ +#define POISON_FREE 0xb6 /* for use-after-free poisoning */ +#define POISON_END 0xab /* end-byte of poisoning */ /* * memory layout of objects: -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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