Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 *) 0x122 + POISON_POINTER_DELTA)
25
26/********** include/linux/timer.h **********/
27#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
28
29/********** mm/page_poison.c **********/
30#ifdef CONFIG_PAGE_POISONING_ZERO
31#define PAGE_POISON 0x00
32#else
33#define PAGE_POISON 0xaa
34#endif
35
36/********** mm/page_alloc.c ************/
37
38#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
39
40/********** mm/slab.c **********/
41/*
42 * Magic nums for obj red zoning.
43 * Placed in the first word before and the first word after an obj.
44 */
45#define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
46#define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
47
48#define SLUB_RED_INACTIVE 0xbb
49#define SLUB_RED_ACTIVE 0xcc
50
51/* ...and for poisoning */
52#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
53#define POISON_FREE 0x6b /* for use-after-free poisoning */
54#define POISON_END 0xa5 /* end-byte of poisoning */
55
56/********** arch/$ARCH/mm/init.c **********/
57#define POISON_FREE_INITMEM 0xcc
58
59/********** arch/ia64/hp/common/sba_iommu.c **********/
60/*
61 * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
62 * value of "SBAIOMMU POISON\0" for spill-over poisoning.
63 */
64
65/********** fs/jbd/journal.c **********/
66#define JBD_POISON_FREE 0x5b
67#define JBD2_POISON_FREE 0x5c
68
69/********** drivers/base/dmapool.c **********/
70#define POOL_POISON_FREED 0xa7 /* !inuse */
71#define POOL_POISON_ALLOCATED 0xa9 /* !initted */
72
73/********** drivers/atm/ **********/
74#define ATM_POISON_FREE 0x12
75#define ATM_POISON 0xdeadbeef
76
77/********** kernel/mutexes **********/
78#define MUTEX_DEBUG_INIT 0x11
79#define MUTEX_DEBUG_FREE 0x22
80#define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA)
81
82/********** security/ **********/
83#define KEY_DESTROY 0xbd
84
85#endif