1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_POISON_H 2 #ifndef _LINUX_POISON_H
3 #define _LINUX_POISON_H 3 #define _LINUX_POISON_H
4 4
5 /********** include/linux/list.h **********/ 5 /********** include/linux/list.h **********/
6 6
7 /* 7 /*
8 * Architectures might want to move the poison 8 * Architectures might want to move the poison pointer offset
9 * into some well-recognized area such as 0xde 9 * into some well-recognized area such as 0xdead000000000000,
10 * that is also not mappable by user-space exp 10 * that is also not mappable by user-space exploits:
11 */ 11 */
12 #ifdef CONFIG_ILLEGAL_POINTER_VALUE 12 #ifdef CONFIG_ILLEGAL_POINTER_VALUE
13 # define POISON_POINTER_DELTA _AC(CONFIG_ILLEG 13 # define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
14 #else 14 #else
15 # define POISON_POINTER_DELTA 0 15 # define POISON_POINTER_DELTA 0
16 #endif 16 #endif
17 17
18 #ifdef __cplusplus 18 #ifdef __cplusplus
19 #define LIST_POISON1 NULL 19 #define LIST_POISON1 NULL
20 #define LIST_POISON2 NULL 20 #define LIST_POISON2 NULL
21 #else 21 #else
22 /* 22 /*
23 * These are non-NULL pointers that will resul 23 * These are non-NULL pointers that will result in page faults
24 * under normal circumstances, used to verify 24 * under normal circumstances, used to verify that nobody uses
25 * non-initialized list entries. 25 * non-initialized list entries.
26 */ 26 */
27 #define LIST_POISON1 ((void *) 0x100 + POISON 27 #define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
28 #define LIST_POISON2 ((void *) 0x200 + POISON 28 #define LIST_POISON2 ((void *) 0x200 + POISON_POINTER_DELTA)
29 #endif 29 #endif
30 30
31 /********** include/linux/timer.h **********/ 31 /********** include/linux/timer.h **********/
32 /* 32 /*
33 * Magic number "tsta" to indicate a static ti 33 * Magic number "tsta" to indicate a static timer initializer
34 * for the object debugging code. 34 * for the object debugging code.
35 */ 35 */
36 #define TIMER_ENTRY_STATIC ((void *) 0x30 36 #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
37 37
38 /********** mm/page_poison.c **********/ !! 38 /********** mm/debug-pagealloc.c **********/
>> 39 #ifdef CONFIG_PAGE_POISONING_ZERO
>> 40 #define PAGE_POISON 0x00
>> 41 #else
39 #define PAGE_POISON 0xaa 42 #define PAGE_POISON 0xaa
>> 43 #endif
40 44
41 /********** mm/page_alloc.c ************/ 45 /********** mm/page_alloc.c ************/
42 46
43 #define TAIL_MAPPING ((void *) 0x400 + POIS 47 #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
44 48
45 /********** mm/slab.c **********/ 49 /********** mm/slab.c **********/
46 /* 50 /*
47 * Magic nums for obj red zoning. 51 * Magic nums for obj red zoning.
48 * Placed in the first word before and the fir 52 * Placed in the first word before and the first word after an obj.
49 */ 53 */
50 #define SLUB_RED_INACTIVE 0xbb /* whe !! 54 #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
51 #define SLUB_RED_ACTIVE 0xcc /* whe !! 55 #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
>> 56
>> 57 #define SLUB_RED_INACTIVE 0xbb
>> 58 #define SLUB_RED_ACTIVE 0xcc
52 59
53 /* ...and for poisoning */ 60 /* ...and for poisoning */
54 #define POISON_INUSE 0x5a /* for use-uni 61 #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
55 #define POISON_FREE 0x6b /* for use-aft 62 #define POISON_FREE 0x6b /* for use-after-free poisoning */
56 #define POISON_END 0xa5 /* end-byte of 63 #define POISON_END 0xa5 /* end-byte of poisoning */
57 64
58 /********** arch/$ARCH/mm/init.c **********/ 65 /********** arch/$ARCH/mm/init.c **********/
59 #define POISON_FREE_INITMEM 0xcc 66 #define POISON_FREE_INITMEM 0xcc
60 67
61 /********** arch/ia64/hp/common/sba_iommu.c ** 68 /********** arch/ia64/hp/common/sba_iommu.c **********/
62 /* 69 /*
63 * arch/ia64/hp/common/sba_iommu.c uses a 16-b 70 * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
64 * value of "SBAIOMMU POISON\0" for spill-over 71 * value of "SBAIOMMU POISON\0" for spill-over poisoning.
65 */ 72 */
66 73
67 /********** fs/jbd/journal.c **********/ 74 /********** fs/jbd/journal.c **********/
68 #define JBD_POISON_FREE 0x5b 75 #define JBD_POISON_FREE 0x5b
69 #define JBD2_POISON_FREE 0x5c 76 #define JBD2_POISON_FREE 0x5c
70 77
71 /********** drivers/base/dmapool.c **********/ 78 /********** drivers/base/dmapool.c **********/
72 #define POOL_POISON_FREED 0xa7 /* !in 79 #define POOL_POISON_FREED 0xa7 /* !inuse */
73 #define POOL_POISON_ALLOCATED 0xa9 /* !in 80 #define POOL_POISON_ALLOCATED 0xa9 /* !initted */
74 81
75 /********** drivers/atm/ **********/ 82 /********** drivers/atm/ **********/
76 #define ATM_POISON_FREE 0x12 83 #define ATM_POISON_FREE 0x12
77 #define ATM_POISON 0xdeadbeef 84 #define ATM_POISON 0xdeadbeef
78 85
79 /********** kernel/mutexes **********/ 86 /********** kernel/mutexes **********/
80 #define MUTEX_DEBUG_INIT 0x11 87 #define MUTEX_DEBUG_INIT 0x11
81 #define MUTEX_DEBUG_FREE 0x22 88 #define MUTEX_DEBUG_FREE 0x22
>> 89
>> 90 /********** lib/flex_array.c **********/
>> 91 #define FLEX_ARRAY_FREE 0x6c /* for use-after-free poisoning */
82 92
83 /********** security/ **********/ 93 /********** security/ **********/
84 #define KEY_DESTROY 0xbd 94 #define KEY_DESTROY 0xbd
85 95
86 #endif 96 #endif
87 97
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