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 #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) 28 29 /********** mm/page_poison.c **********/ 30 #define PAGE_POISON 0xaa 31 32 /********** mm/page_alloc.c ************/ 33 34 #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) 35 36 /********** mm/slab.c **********/ 37 /* 38 * Magic nums for obj red zoning. 39 * Placed in the first word before and the first word after an obj. 40 */ 41 #define SLUB_RED_INACTIVE 0xbb /* when obj is inactive */ 42 #define SLUB_RED_ACTIVE 0xcc /* when obj is active */ 43 44 /* ...and for poisoning */ 45 #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ 46 #define POISON_FREE 0x6b /* for use-after-free poisoning */ 47 #define POISON_END 0xa5 /* end-byte of poisoning */ 48 49 /********** arch/$ARCH/mm/init.c **********/ 50 #define POISON_FREE_INITMEM 0xcc 51 52 /********** fs/jbd/journal.c **********/ 53 #define JBD_POISON_FREE 0x5b 54 #define JBD2_POISON_FREE 0x5c 55 56 /********** drivers/base/dmapool.c **********/ 57 #define POOL_POISON_FREED 0xa7 /* !inuse */ 58 #define POOL_POISON_ALLOCATED 0xa9 /* !initted */ 59 60 /********** drivers/atm/ **********/ 61 #define ATM_POISON_FREE 0x12 62 #define ATM_POISON 0xdeadbeef 63 64 /********** kernel/mutexes **********/ 65 #define MUTEX_DEBUG_INIT 0x11 66 #define MUTEX_DEBUG_FREE 0x22 67 #define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA) 68 69 /********** security/ **********/ 70 #define KEY_DESTROY 0xbd 71 72 /********** net/core/page_pool.c **********/ 73 #define PP_SIGNATURE (0x40 + POISON_POINTER_DELTA) 74 75 /********** net/core/skbuff.c **********/ 76 #define SKB_LIST_POISON_NEXT ((void *)(0x800 + POISON_POINTER_DELTA)) 77 /********** net/ **********/ 78 #define NET_PTR_POISON ((void *)(0x801 + POISON_POINTER_DELTA)) 79 80 /********** kernel/bpf/ **********/ 81 #define BPF_PTR_POISON ((void *)(0xeB9FUL + POISON_POINTER_DELTA)) 82 83 /********** VFS **********/ 84 #define VFS_PTR_POISON ((void *)(0xF5 + POISON_POINTER_DELTA)) 85 86 /********** lib/stackdepot.c **********/ 87 #define STACK_DEPOT_POISON ((void *)(0xD390 + POISON_POINTER_DELTA)) 88 89 #endif 90