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 *) 0x200 + 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 90