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Subject[patch 4/4] change slab poison pattern
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:
--
-
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