1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 #ifndef _LINUX_POISON_H 1 #ifndef _LINUX_POISON_H
3 #define _LINUX_POISON_H 2 #define _LINUX_POISON_H
4 3
5 /********** include/linux/list.h **********/ 4 /********** include/linux/list.h **********/
6 5
7 /* 6 /*
8 * Architectures might want to move the poison 7 * Architectures might want to move the poison pointer offset
9 * into some well-recognized area such as 0xde 8 * into some well-recognized area such as 0xdead000000000000,
10 * that is also not mappable by user-space exp 9 * that is also not mappable by user-space exploits:
11 */ 10 */
12 #ifdef CONFIG_ILLEGAL_POINTER_VALUE 11 #ifdef CONFIG_ILLEGAL_POINTER_VALUE
13 # define POISON_POINTER_DELTA _AC(CONFIG_ILLEG 12 # define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
14 #else 13 #else
15 # define POISON_POINTER_DELTA 0 14 # define POISON_POINTER_DELTA 0
16 #endif 15 #endif
17 16
18 #ifdef __cplusplus <<
19 #define LIST_POISON1 NULL <<
20 #define LIST_POISON2 NULL <<
21 #else <<
22 /* 17 /*
23 * These are non-NULL pointers that will resul 18 * These are non-NULL pointers that will result in page faults
24 * under normal circumstances, used to verify 19 * under normal circumstances, used to verify that nobody uses
25 * non-initialized list entries. 20 * non-initialized list entries.
26 */ 21 */
27 #define LIST_POISON1 ((void *) 0x100 + POISON 22 #define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
28 #define LIST_POISON2 ((void *) 0x200 + POISON 23 #define LIST_POISON2 ((void *) 0x200 + POISON_POINTER_DELTA)
29 #endif <<
30 24
31 /********** include/linux/timer.h **********/ 25 /********** include/linux/timer.h **********/
32 /* 26 /*
33 * Magic number "tsta" to indicate a static ti 27 * Magic number "tsta" to indicate a static timer initializer
34 * for the object debugging code. 28 * for the object debugging code.
35 */ 29 */
36 #define TIMER_ENTRY_STATIC ((void *) 0x30 30 #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
37 31
38 /********** mm/page_poison.c **********/ !! 32 /********** mm/debug-pagealloc.c **********/
>> 33 #ifdef CONFIG_PAGE_POISONING_ZERO
>> 34 #define PAGE_POISON 0x00
>> 35 #else
39 #define PAGE_POISON 0xaa 36 #define PAGE_POISON 0xaa
>> 37 #endif
40 38
41 /********** mm/page_alloc.c ************/ 39 /********** mm/page_alloc.c ************/
42 40
43 #define TAIL_MAPPING ((void *) 0x400 + POIS 41 #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
44 42
45 /********** mm/slab.c **********/ 43 /********** mm/slab.c **********/
46 /* 44 /*
47 * Magic nums for obj red zoning. 45 * Magic nums for obj red zoning.
48 * Placed in the first word before and the fir 46 * Placed in the first word before and the first word after an obj.
49 */ 47 */
50 #define SLUB_RED_INACTIVE 0xbb /* whe !! 48 #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
51 #define SLUB_RED_ACTIVE 0xcc /* whe !! 49 #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
>> 50
>> 51 #define SLUB_RED_INACTIVE 0xbb
>> 52 #define SLUB_RED_ACTIVE 0xcc
52 53
53 /* ...and for poisoning */ 54 /* ...and for poisoning */
54 #define POISON_INUSE 0x5a /* for use-uni 55 #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
55 #define POISON_FREE 0x6b /* for use-aft 56 #define POISON_FREE 0x6b /* for use-after-free poisoning */
56 #define POISON_END 0xa5 /* end-byte of 57 #define POISON_END 0xa5 /* end-byte of poisoning */
57 58
58 /********** arch/$ARCH/mm/init.c **********/ 59 /********** arch/$ARCH/mm/init.c **********/
59 #define POISON_FREE_INITMEM 0xcc 60 #define POISON_FREE_INITMEM 0xcc
60 61
61 /********** arch/ia64/hp/common/sba_iommu.c ** 62 /********** arch/ia64/hp/common/sba_iommu.c **********/
62 /* 63 /*
63 * arch/ia64/hp/common/sba_iommu.c uses a 16-b 64 * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
64 * value of "SBAIOMMU POISON\0" for spill-over 65 * value of "SBAIOMMU POISON\0" for spill-over poisoning.
65 */ 66 */
66 67
67 /********** fs/jbd/journal.c **********/ 68 /********** fs/jbd/journal.c **********/
68 #define JBD_POISON_FREE 0x5b 69 #define JBD_POISON_FREE 0x5b
69 #define JBD2_POISON_FREE 0x5c 70 #define JBD2_POISON_FREE 0x5c
70 71
71 /********** drivers/base/dmapool.c **********/ 72 /********** drivers/base/dmapool.c **********/
72 #define POOL_POISON_FREED 0xa7 /* !in 73 #define POOL_POISON_FREED 0xa7 /* !inuse */
73 #define POOL_POISON_ALLOCATED 0xa9 /* !in 74 #define POOL_POISON_ALLOCATED 0xa9 /* !initted */
74 75
75 /********** drivers/atm/ **********/ 76 /********** drivers/atm/ **********/
76 #define ATM_POISON_FREE 0x12 77 #define ATM_POISON_FREE 0x12
77 #define ATM_POISON 0xdeadbeef 78 #define ATM_POISON 0xdeadbeef
78 79
79 /********** kernel/mutexes **********/ 80 /********** kernel/mutexes **********/
80 #define MUTEX_DEBUG_INIT 0x11 81 #define MUTEX_DEBUG_INIT 0x11
81 #define MUTEX_DEBUG_FREE 0x22 82 #define MUTEX_DEBUG_FREE 0x22
>> 83
>> 84 /********** lib/flex_array.c **********/
>> 85 #define FLEX_ARRAY_FREE 0x6c /* for use-after-free poisoning */
82 86
83 /********** security/ **********/ 87 /********** security/ **********/
84 #define KEY_DESTROY 0xbd 88 #define KEY_DESTROY 0xbd
85 89
86 #endif 90 #endif
87 91
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