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 /* 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 *) 0x122 + 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/page_poison.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 #define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA) 85 86 /********** security/ **********/ 87 #define KEY_DESTROY 0xbd 88 89 #endif