| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 2 | #ifndef _LINUX_POISON_H |
| 3 | #define _LINUX_POISON_H |
| 4 | |
| 5 | /********** include/linux/list.h **********/ |
| Avi Kivity | a29815a | 2010-01-10 16:28:09 +0200 | [diff] [blame] | 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 | |
| Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 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 | */ |
| Vasily Kulikov | 8a5e5e0 | 2015-09-09 15:36:00 -0700 | [diff] [blame] | 23 | #define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA) |
| Alexey Dobriyan | 4c6080c | 2019-07-16 16:27:12 -0700 | [diff] [blame] | 24 | #define LIST_POISON2 ((void *) 0x122 + POISON_POINTER_DELTA) |
| Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 25 | |
| Thomas Gleixner | c6f3a97 | 2008-04-30 00:55:03 -0700 | [diff] [blame] | 26 | /********** include/linux/timer.h **********/ |
| 27 | /* |
| 28 | * Magic number "tsta" to indicate a static timer initializer |
| 29 | * for the object debugging code. |
| 30 | */ |
| Vasily Kulikov | b8a0255 | 2016-01-15 16:57:55 -0800 | [diff] [blame] | 31 | #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) |
| Thomas Gleixner | c6f3a97 | 2008-04-30 00:55:03 -0700 | [diff] [blame] | 32 | |
| Michael S. Tsirkin | 6d2bef9 | 2019-03-05 15:48:33 -0800 | [diff] [blame] | 33 | /********** mm/page_poison.c **********/ |
| Laura Abbott | 1414c7f | 2016-03-15 14:56:30 -0700 | [diff] [blame] | 34 | #ifdef CONFIG_PAGE_POISONING_ZERO |
| 35 | #define PAGE_POISON 0x00 |
| 36 | #else |
| Akinobu Mita | 6a11f75 | 2009-03-31 15:23:17 -0700 | [diff] [blame] | 37 | #define PAGE_POISON 0xaa |
| Laura Abbott | 1414c7f | 2016-03-15 14:56:30 -0700 | [diff] [blame] | 38 | #endif |
| Akinobu Mita | 6a11f75 | 2009-03-31 15:23:17 -0700 | [diff] [blame] | 39 | |
| Kirill A. Shutemov | 1c290f6 | 2016-01-15 16:52:07 -0800 | [diff] [blame] | 40 | /********** mm/page_alloc.c ************/ |
| 41 | |
| Vasily Kulikov | b8a0255 | 2016-01-15 16:57:55 -0800 | [diff] [blame] | 42 | #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) |
| Kirill A. Shutemov | 1c290f6 | 2016-01-15 16:52:07 -0800 | [diff] [blame] | 43 | |
| Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 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 | */ |
| David Woodhouse | b46b8f1 | 2007-05-08 00:22:59 -0700 | [diff] [blame] | 49 | #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */ |
| 50 | #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */ |
| Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 51 | |
| Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 52 | #define SLUB_RED_INACTIVE 0xbb |
| 53 | #define SLUB_RED_ACTIVE 0xcc |
| 54 | |
| Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 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 | |
| Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 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 **********/ |
| Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 70 | #define JBD_POISON_FREE 0x5b |
| 71 | #define JBD2_POISON_FREE 0x5c |
| Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 72 | |
| 73 | /********** drivers/base/dmapool.c **********/ |
| 74 | #define POOL_POISON_FREED 0xa7 /* !inuse */ |
| 75 | #define POOL_POISON_ALLOCATED 0xa9 /* !initted */ |
| 76 | |
| Randy Dunlap | b3c681e | 2006-06-27 02:53:53 -0700 | [diff] [blame] | 77 | /********** drivers/atm/ **********/ |
| 78 | #define ATM_POISON_FREE 0x12 |
| Randy Dunlap | 3c6b377 | 2006-07-03 19:48:25 -0700 | [diff] [blame] | 79 | #define ATM_POISON 0xdeadbeef |
| Randy Dunlap | b3c681e | 2006-06-27 02:53:53 -0700 | [diff] [blame] | 80 | |
| Randy Dunlap | a7807a3 | 2006-06-27 02:53:54 -0700 | [diff] [blame] | 81 | /********** kernel/mutexes **********/ |
| 82 | #define MUTEX_DEBUG_INIT 0x11 |
| 83 | #define MUTEX_DEBUG_FREE 0x22 |
| Nicolai Hähnle | 977625a | 2016-12-21 19:46:39 +0100 | [diff] [blame] | 84 | #define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA) |
| Randy Dunlap | a7807a3 | 2006-06-27 02:53:54 -0700 | [diff] [blame] | 85 | |
| 86 | /********** security/ **********/ |
| 87 | #define KEY_DESTROY 0xbd |
| 88 | |
| Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 89 | #endif |