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