1 /* SPDX-License-Identifier: GPL-2.0 */ 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 #ifdef __cplusplus 19 #define LIST_POISON1 NULL 20 #define LIST_POISON2 NULL 21 #else 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) 29 #endif 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 90 /********** lib/flex_array.c **********/ 91 #define FLEX_ARRAY_FREE 0x6c /* for use-after-free poisoning */ 92 93 /********** security/ **********/ 94 #define KEY_DESTROY 0xbd 95 96 #endif 97