| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Arnaldo Carvalho de Melo | ae3c14a | 2016-07-18 18:39:36 -0300 | [diff] [blame] | 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 | |
| Arnaldo Carvalho de Melo | 6ae8eef | 2017-09-21 12:12:17 -0300 | [diff] [blame] | 18 | #ifdef __cplusplus |
| 19 | #define LIST_POISON1 NULL |
| 20 | #define LIST_POISON2 NULL |
| 21 | #else |
| Arnaldo Carvalho de Melo | ae3c14a | 2016-07-18 18:39:36 -0300 | [diff] [blame] | 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) |
| Arnaldo Carvalho de Melo | 6ae8eef | 2017-09-21 12:12:17 -0300 | [diff] [blame] | 29 | #endif |
| Arnaldo Carvalho de Melo | ae3c14a | 2016-07-18 18:39:36 -0300 | [diff] [blame] | 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/debug-pagealloc.c **********/ |
| 39 | #ifdef CONFIG_PAGE_POISONING_ZERO |
| 40 | #define PAGE_POISON 0x00 |
| 41 | #else |
| 42 | #define PAGE_POISON 0xaa |
| 43 | #endif |
| 44 | |
| 45 | /********** mm/page_alloc.c ************/ |
| 46 | |
| 47 | #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) |
| 48 | |
| 49 | /********** mm/slab.c **********/ |
| 50 | /* |
| 51 | * Magic nums for obj red zoning. |
| 52 | * Placed in the first word before and the first word after an obj. |
| 53 | */ |
| 54 | #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */ |
| 55 | #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */ |
| 56 | |
| 57 | #define SLUB_RED_INACTIVE 0xbb |
| 58 | #define SLUB_RED_ACTIVE 0xcc |
| 59 | |
| 60 | /* ...and for poisoning */ |
| 61 | #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ |
| 62 | #define POISON_FREE 0x6b /* for use-after-free poisoning */ |
| 63 | #define POISON_END 0xa5 /* end-byte of poisoning */ |
| 64 | |
| 65 | /********** arch/$ARCH/mm/init.c **********/ |
| 66 | #define POISON_FREE_INITMEM 0xcc |
| 67 | |
| 68 | /********** arch/ia64/hp/common/sba_iommu.c **********/ |
| 69 | /* |
| 70 | * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a |
| 71 | * value of "SBAIOMMU POISON\0" for spill-over poisoning. |
| 72 | */ |
| 73 | |
| 74 | /********** fs/jbd/journal.c **********/ |
| 75 | #define JBD_POISON_FREE 0x5b |
| 76 | #define JBD2_POISON_FREE 0x5c |
| 77 | |
| 78 | /********** drivers/base/dmapool.c **********/ |
| 79 | #define POOL_POISON_FREED 0xa7 /* !inuse */ |
| 80 | #define POOL_POISON_ALLOCATED 0xa9 /* !initted */ |
| 81 | |
| 82 | /********** drivers/atm/ **********/ |
| 83 | #define ATM_POISON_FREE 0x12 |
| 84 | #define ATM_POISON 0xdeadbeef |
| 85 | |
| 86 | /********** kernel/mutexes **********/ |
| 87 | #define MUTEX_DEBUG_INIT 0x11 |
| 88 | #define MUTEX_DEBUG_FREE 0x22 |
| 89 | |
| Arnaldo Carvalho de Melo | ae3c14a | 2016-07-18 18:39:36 -0300 | [diff] [blame] | 90 | /********** security/ **********/ |
| 91 | #define KEY_DESTROY 0xbd |
| 92 | |
| 93 | #endif |