1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_POISON_H
3#define _LINUX_POISON_H
4
5/********** include/linux/list.h **********/
6
7/*
8 * Architectures might want to move the poison pointer offset
9 * into some well-recognized area such as 0xdead000000000000,
10 * that is also not mappable by user-space exploits:
11 */
12#ifdef CONFIG_ILLEGAL_POINTER_VALUE
13# define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
14#else
15# define POISON_POINTER_DELTA 0
16#endif
17
18/*
19 * These are non-NULL pointers that will result in page faults
20 * under normal circumstances, used to verify that nobody uses
21 * non-initialized list entries.
22 */
23#define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
24#define LIST_POISON2 ((void *) 0x200 + POISON_POINTER_DELTA)
25
26/********** include/linux/timer.h **********/
27/*
28 * Magic number "tsta" to indicate a static timer initializer
29 * for the object debugging code.
30 */
31#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
32
33/********** mm/page_poison.c **********/
34#ifdef CONFIG_PAGE_POISONING_ZERO
35#define PAGE_POISON 0x00
36#else
37#define PAGE_POISON 0xaa
38#endif
39
40/********** mm/page_alloc.c ************/
41
42#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
43
44/********** mm/slab.c **********/
45/*
46 * Magic nums for obj red zoning.
47 * Placed in the first word before and the first word after an obj.
48 */
49#define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
50#define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
51
52#define SLUB_RED_INACTIVE 0xbb
53#define SLUB_RED_ACTIVE 0xcc
54
55/* ...and for poisoning */
56#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
57#define POISON_FREE 0x6b /* for use-after-free poisoning */
58#define POISON_END 0xa5 /* end-byte of poisoning */
59
60/********** arch/$ARCH/mm/init.c **********/
61#define POISON_FREE_INITMEM 0xcc
62
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 **********/
70#define JBD_POISON_FREE 0x5b
71#define JBD2_POISON_FREE 0x5c
72
73/********** drivers/base/dmapool.c **********/
74#define POOL_POISON_FREED 0xa7 /* !inuse */
75#define POOL_POISON_ALLOCATED 0xa9 /* !initted */
76
77/********** drivers/atm/ **********/
78#define ATM_POISON_FREE 0x12
79#define ATM_POISON 0xdeadbeef
80
81/********** kernel/mutexes **********/
82#define MUTEX_DEBUG_INIT 0x11
83#define MUTEX_DEBUG_FREE 0x22
84#define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA)
85
86/********** security/ **********/
87#define KEY_DESTROY 0xbd
88
89#endif
90