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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/linux/poison.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_POISON_H
3 #define _LINUX_POISON_H
5 /********** include/linux/list.h **********/
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:
12 #ifdef CONFIG_ILLEGAL_POINTER_VALUE
13 # define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
15 # define POISON_POINTER_DELTA 0
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.
23 #define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
24 #define LIST_POISON2 ((void *) 0x122 + POISON_POINTER_DELTA)
26 /********** include/linux/timer.h **********/
27 #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
29 /********** mm/page_poison.c **********/
30 #define PAGE_POISON 0xaa
32 /********** mm/page_alloc.c ************/
34 #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
36 /********** mm/slab.c **********/
38 * Magic nums for obj red zoning.
39 * Placed in the first word before and the first word after an obj.
41 #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
42 #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
44 #define SLUB_RED_INACTIVE 0xbb
45 #define SLUB_RED_ACTIVE 0xcc
47 /* ...and for poisoning */
48 #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
49 #define POISON_FREE 0x6b /* for use-after-free poisoning */
50 #define POISON_END 0xa5 /* end-byte of poisoning */
52 /********** arch/$ARCH/mm/init.c **********/
53 #define POISON_FREE_INITMEM 0xcc
55 /********** arch/ia64/hp/common/sba_iommu.c **********/
57 * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
58 * value of "SBAIOMMU POISON\0" for spill-over poisoning.
61 /********** fs/jbd/journal.c **********/
62 #define JBD_POISON_FREE 0x5b
63 #define JBD2_POISON_FREE 0x5c
65 /********** drivers/base/dmapool.c **********/
66 #define POOL_POISON_FREED 0xa7 /* !inuse */
67 #define POOL_POISON_ALLOCATED 0xa9 /* !initted */
69 /********** drivers/atm/ **********/
70 #define ATM_POISON_FREE 0x12
71 #define ATM_POISON 0xdeadbeef
73 /********** kernel/mutexes **********/
74 #define MUTEX_DEBUG_INIT 0x11
75 #define MUTEX_DEBUG_FREE 0x22
76 #define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA)
78 /********** security/ **********/
79 #define KEY_DESTROY 0xbd