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gerrit-public.fairphone.software / kernel / msm-4.9 / 8022887cda044524610ef2a5a45feb9d96b11b4f / . / include / linux / poison.h
blob: 34066ffd893d733b8134da1b57915bec314afb48 [file] [log] [blame]
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]1#ifndef _LINUX_POISON_H
2#define _LINUX_POISON_H
3
4/********** include/linux/list.h **********/
Avi Kivitya29815a2010-01-10 16:28:09 +0200[diff] [blame]5
6/*
7 * Architectures might want to move the poison pointer offset
8 * into some well-recognized area such as 0xdead000000000000,
9 * that is also not mappable by user-space exploits:
10 */
11#ifdef CONFIG_ILLEGAL_POINTER_VALUE
12# define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
13#else
14# define POISON_POINTER_DELTA 0
15#endif
16
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]17/*
18 * These are non-NULL pointers that will result in page faults
19 * under normal circumstances, used to verify that nobody uses
20 * non-initialized list entries.
21 */
Avi Kivitya29815a2010-01-10 16:28:09 +0200[diff] [blame]22#define LIST_POISON1 ((void *) 0x00100100 + POISON_POINTER_DELTA)
23#define LIST_POISON2 ((void *) 0x00200200 + POISON_POINTER_DELTA)
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]24
Thomas Gleixnerc6f3a972008-04-30 00:55:03 -0700[diff] [blame]25/********** include/linux/timer.h **********/
26/*
27 * Magic number "tsta" to indicate a static timer initializer
28 * for the object debugging code.
29 */
30#define TIMER_ENTRY_STATIC ((void *) 0x74737461)
31
Akinobu Mita6a11f752009-03-31 15:23:17 -0700[diff] [blame]32/********** mm/debug-pagealloc.c **********/
33#define PAGE_POISON 0xaa
34
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]35/********** mm/slab.c **********/
36/*
37 * Magic nums for obj red zoning.
38 * Placed in the first word before and the first word after an obj.
39 */
David Woodhouseb46b8f12007-05-08 00:22:59 -0700[diff] [blame]40#define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
41#define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]42
Christoph Lameter81819f02007-05-06 14:49:36 -0700[diff] [blame]43#define SLUB_RED_INACTIVE 0xbb
44#define SLUB_RED_ACTIVE 0xcc
45
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]46/* ...and for poisoning */
47#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
48#define POISON_FREE 0x6b /* for use-after-free poisoning */
49#define POISON_END 0xa5 /* end-byte of poisoning */
50
Mel Gorman23be7462010-04-23 13:17:56 -0400[diff] [blame]51/********** mm/hugetlb.c **********/
52/*
53 * Private mappings of hugetlb pages use this poisoned value for
54 * page->mapping. The core VM should not be doing anything with this mapping
55 * but futex requires the existence of some page->mapping value even though it
56 * is unused if PAGE_MAPPING_ANON is set.
57 */
58#define HUGETLB_POISON ((void *)(0x00300300 + POISON_POINTER_DELTA + PAGE_MAPPING_ANON))
59
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]60/********** arch/$ARCH/mm/init.c **********/
61#define POISON_FREE_INITMEM 0xcc
62
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]63/********** arch/ia64/hp/common/sba_iommu.c **********/
64/*
65 * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
66 * value of "SBAIOMMU POISON\0" for spill-over poisoning.
67 */
68
69/********** fs/jbd/journal.c **********/
Mingming Caocd02ff02007-10-16 18:38:25 -0400[diff] [blame]70#define JBD_POISON_FREE 0x5b
71#define JBD2_POISON_FREE 0x5c
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]72
73/********** drivers/base/dmapool.c **********/
74#define POOL_POISON_FREED 0xa7 /* !inuse */
75#define POOL_POISON_ALLOCATED 0xa9 /* !initted */
76
Randy Dunlapb3c681e2006-06-27 02:53:53 -0700[diff] [blame]77/********** drivers/atm/ **********/
78#define ATM_POISON_FREE 0x12
Randy Dunlap3c6b3772006-07-03 19:48:25 -0700[diff] [blame]79#define ATM_POISON 0xdeadbeef
Randy Dunlapb3c681e2006-06-27 02:53:53 -0700[diff] [blame]80
Randy Dunlap4bdbf6c2006-07-03 19:47:27 -0700[diff] [blame]81/********** net/ **********/
82#define NEIGHBOR_DEAD 0xdeadbeef
83#define NETFILTER_LINK_POISON 0xdead57ac
84
Randy Dunlapa7807a32006-06-27 02:53:54 -0700[diff] [blame]85/********** kernel/mutexes **********/
86#define MUTEX_DEBUG_INIT 0x11
87#define MUTEX_DEBUG_FREE 0x22
88
David Rientjes19da3dd2009-09-21 17:04:31 -0700[diff] [blame]89/********** lib/flex_array.c **********/
90#define FLEX_ARRAY_FREE 0x6c /* for use-after-free poisoning */
91
Randy Dunlapa7807a32006-06-27 02:53:54 -0700[diff] [blame]92/********** security/ **********/
93#define KEY_DESTROY 0xbd
94
Randy Dunlapb3c681e2006-06-27 02:53:53 -0700[diff] [blame]95/********** sound/oss/ **********/
96#define OSS_POISON_FREE 0xAB
97
Randy Dunlapc9cf5522006-06-27 02:53:52 -0700[diff] [blame]98#endif