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authorRandy Dunlap <rdunlap@xenotime.net>2006-06-27 02:53:52 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-27 17:32:38 -0700
commitc9cf55285e87ac423c45d9efca750d3f50234d10 (patch)
treed46f3e90fbb38115c25b3315f6280ad65f83a14f /include/linux/poison.h
parente6e5494cb23d1933735ee47cc674ffe1c4afed6f (diff)
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[PATCH] add poison.h and patch primary users
Localize poison values into one header file for better documentation and easier/quicker debugging and so that the same values won't be used for multiple purposes. Use these constants in core arch., mm, driver, and fs code. Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Acked-by: Matt Mackall <mpm@selenic.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/poison.h')
-rw-r--r--include/linux/poison.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/poison.h b/include/linux/poison.h
new file mode 100644
index 0000000..d536de7
--- /dev/null
+++ b/include/linux/poison.h
@@ -0,0 +1,45 @@
+#ifndef _LINUX_POISON_H
+#define _LINUX_POISON_H
+
+/********** include/linux/list.h **********/
+/*
+ * These are non-NULL pointers that will result in page faults
+ * under normal circumstances, used to verify that nobody uses
+ * non-initialized list entries.
+ */
+#define LIST_POISON1 ((void *) 0x00100100)
+#define LIST_POISON2 ((void *) 0x00200200)
+
+/********** mm/slab.c **********/
+/*
+ * Magic nums for obj red zoning.
+ * Placed in the first word before and the first word after an obj.
+ */
+#define RED_INACTIVE 0x5A2CF071UL /* when obj is inactive */
+#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 */
+
+/********** arch/$ARCH/mm/init.c **********/
+#define POISON_FREE_INITMEM 0xcc
+
+/********** arch/x86_64/mm/init.c **********/
+#define POISON_FREE_INITDATA 0xba
+
+/********** arch/ia64/hp/common/sba_iommu.c **********/
+/*
+ * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
+ * value of "SBAIOMMU POISON\0" for spill-over poisoning.
+ */
+
+/********** fs/jbd/journal.c **********/
+#define JBD_POISON_FREE 0x5b
+
+/********** drivers/base/dmapool.c **********/
+#define POOL_POISON_FREED 0xa7 /* !inuse */
+#define POOL_POISON_ALLOCATED 0xa9 /* !initted */
+
+#endif
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