Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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#ifdef __cplusplus
19#define LIST_POISON1 NULL
20#define LIST_POISON2 NULL
21#else
22/*
23 * These are non-NULL pointers that will result in page faults
24 * under normal circumstances, used to verify that nobody uses
25 * non-initialized list entries.
26 */
27#define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
28#define LIST_POISON2 ((void *) 0x200 + POISON_POINTER_DELTA)
29#endif
30
31/********** include/linux/timer.h **********/
32/*
33 * Magic number "tsta" to indicate a static timer initializer
34 * for the object debugging code.
35 */
36#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
37
38/********** mm/page_poison.c **********/
39#define PAGE_POISON 0xaa
40
41/********** mm/page_alloc.c ************/
42
43#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
44
45/********** mm/slab.c **********/
46/*
47 * Magic nums for obj red zoning.
48 * Placed in the first word before and the first word after an obj.
49 */
50#define SLUB_RED_INACTIVE 0xbb /* when obj is inactive */
51#define SLUB_RED_ACTIVE 0xcc /* when obj is active */
52
53/* ...and for poisoning */
54#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
55#define POISON_FREE 0x6b /* for use-after-free poisoning */
56#define POISON_END 0xa5 /* end-byte of poisoning */
57
58/********** arch/$ARCH/mm/init.c **********/
59#define POISON_FREE_INITMEM 0xcc
60
61/********** arch/ia64/hp/common/sba_iommu.c **********/
62/*
63 * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
64 * value of "SBAIOMMU POISON\0" for spill-over poisoning.
65 */
66
67/********** fs/jbd/journal.c **********/
68#define JBD_POISON_FREE 0x5b
69#define JBD2_POISON_FREE 0x5c
70
71/********** drivers/base/dmapool.c **********/
72#define POOL_POISON_FREED 0xa7 /* !inuse */
73#define POOL_POISON_ALLOCATED 0xa9 /* !initted */
74
75/********** drivers/atm/ **********/
76#define ATM_POISON_FREE 0x12
77#define ATM_POISON 0xdeadbeef
78
79/********** kernel/mutexes **********/
80#define MUTEX_DEBUG_INIT 0x11
81#define MUTEX_DEBUG_FREE 0x22
82
83/********** security/ **********/
84#define KEY_DESTROY 0xbd
85
86#endif