1 #ifndef _LINUX_POISON_H
2 #define _LINUX_POISON_H
4 /********** include/linux/list.h **********/
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:
11 #ifdef CONFIG_ILLEGAL_POINTER_VALUE
12 # define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
14 # define POISON_POINTER_DELTA 0
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.
22 #define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
23 #define LIST_POISON2 ((void *) 0x200 + POISON_POINTER_DELTA)
25 /********** include/linux/timer.h **********/
27 * Magic number "tsta" to indicate a static timer initializer
28 * for the object debugging code.
30 #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
32 /********** mm/debug-pagealloc.c **********/
33 #ifdef CONFIG_PAGE_POISONING_ZERO
34 #define PAGE_POISON 0x00
36 #define PAGE_POISON 0xaa
39 /********** mm/page_alloc.c ************/
41 #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
43 /********** mm/slab.c **********/
45 * Magic nums for obj red zoning.
46 * Placed in the first word before and the first word after an obj.
48 #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
49 #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
51 #define SLUB_RED_INACTIVE 0xbb
52 #define SLUB_RED_ACTIVE 0xcc
54 /* ...and for poisoning */
55 #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
56 #define POISON_FREE 0x6b /* for use-after-free poisoning */
57 #define POISON_END 0xa5 /* end-byte of poisoning */
59 /********** arch/$ARCH/mm/init.c **********/
60 #define POISON_FREE_INITMEM 0xcc
62 /********** arch/ia64/hp/common/sba_iommu.c **********/
64 * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
65 * value of "SBAIOMMU POISON\0" for spill-over poisoning.
68 /********** fs/jbd/journal.c **********/
69 #define JBD_POISON_FREE 0x5b
70 #define JBD2_POISON_FREE 0x5c
72 /********** drivers/base/dmapool.c **********/
73 #define POOL_POISON_FREED 0xa7 /* !inuse */
74 #define POOL_POISON_ALLOCATED 0xa9 /* !initted */
76 /********** drivers/atm/ **********/
77 #define ATM_POISON_FREE 0x12
78 #define ATM_POISON 0xdeadbeef
80 /********** kernel/mutexes **********/
81 #define MUTEX_DEBUG_INIT 0x11
82 #define MUTEX_DEBUG_FREE 0x22
84 /********** lib/flex_array.c **********/
85 #define FLEX_ARRAY_FREE 0x6c /* for use-after-free poisoning */
87 /********** security/ **********/
88 #define KEY_DESTROY 0xbd