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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
ae3c14a0 ACM |
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 *) 0x200 + POISON_POINTER_DELTA) | |
25 | ||
26 | /********** include/linux/timer.h **********/ | |
27 | /* | |
28 | * Magic number "tsta" to indicate a static timer initializer | |
29 | * for the object debugging code. | |
30 | */ | |
31 | #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) | |
32 | ||
33 | /********** mm/debug-pagealloc.c **********/ | |
34 | #ifdef CONFIG_PAGE_POISONING_ZERO | |
35 | #define PAGE_POISON 0x00 | |
36 | #else | |
37 | #define PAGE_POISON 0xaa | |
38 | #endif | |
39 | ||
40 | /********** mm/page_alloc.c ************/ | |
41 | ||
42 | #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) | |
43 | ||
44 | /********** mm/slab.c **********/ | |
45 | /* | |
46 | * Magic nums for obj red zoning. | |
47 | * Placed in the first word before and the first word after an obj. | |
48 | */ | |
49 | #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */ | |
50 | #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */ | |
51 | ||
52 | #define SLUB_RED_INACTIVE 0xbb | |
53 | #define SLUB_RED_ACTIVE 0xcc | |
54 | ||
55 | /* ...and for poisoning */ | |
56 | #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ | |
57 | #define POISON_FREE 0x6b /* for use-after-free poisoning */ | |
58 | #define POISON_END 0xa5 /* end-byte of poisoning */ | |
59 | ||
60 | /********** arch/$ARCH/mm/init.c **********/ | |
61 | #define POISON_FREE_INITMEM 0xcc | |
62 | ||
63 | /********** arch/ia64/hp/common/sba_iommu.c **********/ | |
64 | /* | |
65 | * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a | |
66 | * value of "SBAIOMMU POISON\0" for spill-over poisoning. | |
67 | */ | |
68 | ||
69 | /********** fs/jbd/journal.c **********/ | |
70 | #define JBD_POISON_FREE 0x5b | |
71 | #define JBD2_POISON_FREE 0x5c | |
72 | ||
73 | /********** drivers/base/dmapool.c **********/ | |
74 | #define POOL_POISON_FREED 0xa7 /* !inuse */ | |
75 | #define POOL_POISON_ALLOCATED 0xa9 /* !initted */ | |
76 | ||
77 | /********** drivers/atm/ **********/ | |
78 | #define ATM_POISON_FREE 0x12 | |
79 | #define ATM_POISON 0xdeadbeef | |
80 | ||
81 | /********** kernel/mutexes **********/ | |
82 | #define MUTEX_DEBUG_INIT 0x11 | |
83 | #define MUTEX_DEBUG_FREE 0x22 | |
84 | ||
85 | /********** lib/flex_array.c **********/ | |
86 | #define FLEX_ARRAY_FREE 0x6c /* for use-after-free poisoning */ | |
87 | ||
88 | /********** security/ **********/ | |
89 | #define KEY_DESTROY 0xbd | |
90 | ||
91 | #endif |