1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2c9cf5528SRandy Dunlap #ifndef _LINUX_POISON_H 3c9cf5528SRandy Dunlap #define _LINUX_POISON_H 4c9cf5528SRandy Dunlap 5c9cf5528SRandy Dunlap /********** include/linux/list.h **********/ 6a29815a3SAvi Kivity 7a29815a3SAvi Kivity /* 8a29815a3SAvi Kivity * Architectures might want to move the poison pointer offset 9a29815a3SAvi Kivity * into some well-recognized area such as 0xdead000000000000, 10a29815a3SAvi Kivity * that is also not mappable by user-space exploits: 11a29815a3SAvi Kivity */ 12a29815a3SAvi Kivity #ifdef CONFIG_ILLEGAL_POINTER_VALUE 13a29815a3SAvi Kivity # define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL) 14a29815a3SAvi Kivity #else 15a29815a3SAvi Kivity # define POISON_POINTER_DELTA 0 16a29815a3SAvi Kivity #endif 17a29815a3SAvi Kivity 18c9cf5528SRandy Dunlap /* 19c9cf5528SRandy Dunlap * These are non-NULL pointers that will result in page faults 20c9cf5528SRandy Dunlap * under normal circumstances, used to verify that nobody uses 21c9cf5528SRandy Dunlap * non-initialized list entries. 22c9cf5528SRandy Dunlap */ 238a5e5e02SVasily Kulikov #define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA) 244c6080cdSAlexey Dobriyan #define LIST_POISON2 ((void *) 0x122 + POISON_POINTER_DELTA) 25c9cf5528SRandy Dunlap 26c6f3a97fSThomas Gleixner /********** include/linux/timer.h **********/ 27b8a0255dSVasily Kulikov #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) 28c6f3a97fSThomas Gleixner 296d2bef9dSMichael S. Tsirkin /********** mm/page_poison.c **********/ 306a11f75bSAkinobu Mita #define PAGE_POISON 0xaa 316a11f75bSAkinobu Mita 321c290f64SKirill A. Shutemov /********** mm/page_alloc.c ************/ 331c290f64SKirill A. Shutemov 34b8a0255dSVasily Kulikov #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) 351c290f64SKirill A. Shutemov 36c9cf5528SRandy Dunlap /********** mm/slab.c **********/ 37c9cf5528SRandy Dunlap /* 38c9cf5528SRandy Dunlap * Magic nums for obj red zoning. 39c9cf5528SRandy Dunlap * Placed in the first word before and the first word after an obj. 40c9cf5528SRandy Dunlap */ 41b46b8f19SDavid Woodhouse #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */ 42b46b8f19SDavid Woodhouse #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */ 43c9cf5528SRandy Dunlap 4481819f0fSChristoph Lameter #define SLUB_RED_INACTIVE 0xbb 4581819f0fSChristoph Lameter #define SLUB_RED_ACTIVE 0xcc 4681819f0fSChristoph Lameter 47c9cf5528SRandy Dunlap /* ...and for poisoning */ 48c9cf5528SRandy Dunlap #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ 49c9cf5528SRandy Dunlap #define POISON_FREE 0x6b /* for use-after-free poisoning */ 50c9cf5528SRandy Dunlap #define POISON_END 0xa5 /* end-byte of poisoning */ 51c9cf5528SRandy Dunlap 52c9cf5528SRandy Dunlap /********** arch/$ARCH/mm/init.c **********/ 53c9cf5528SRandy Dunlap #define POISON_FREE_INITMEM 0xcc 54c9cf5528SRandy Dunlap 55c9cf5528SRandy Dunlap /********** arch/ia64/hp/common/sba_iommu.c **********/ 56c9cf5528SRandy Dunlap /* 57c9cf5528SRandy Dunlap * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a 58c9cf5528SRandy Dunlap * value of "SBAIOMMU POISON\0" for spill-over poisoning. 59c9cf5528SRandy Dunlap */ 60c9cf5528SRandy Dunlap 61c9cf5528SRandy Dunlap /********** fs/jbd/journal.c **********/ 62c9cf5528SRandy Dunlap #define JBD_POISON_FREE 0x5b 63cd02ff0bSMingming Cao #define JBD2_POISON_FREE 0x5c 64c9cf5528SRandy Dunlap 65c9cf5528SRandy Dunlap /********** drivers/base/dmapool.c **********/ 66c9cf5528SRandy Dunlap #define POOL_POISON_FREED 0xa7 /* !inuse */ 67c9cf5528SRandy Dunlap #define POOL_POISON_ALLOCATED 0xa9 /* !initted */ 68c9cf5528SRandy Dunlap 69b3c681e0SRandy Dunlap /********** drivers/atm/ **********/ 70b3c681e0SRandy Dunlap #define ATM_POISON_FREE 0x12 713c6b3773SRandy Dunlap #define ATM_POISON 0xdeadbeef 72b3c681e0SRandy Dunlap 73a7807a32SRandy Dunlap /********** kernel/mutexes **********/ 74a7807a32SRandy Dunlap #define MUTEX_DEBUG_INIT 0x11 75a7807a32SRandy Dunlap #define MUTEX_DEBUG_FREE 0x22 76977625a6SNicolai Hähnle #define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA) 77a7807a32SRandy Dunlap 78a7807a32SRandy Dunlap /********** security/ **********/ 79a7807a32SRandy Dunlap #define KEY_DESTROY 0xbd 80a7807a32SRandy Dunlap 81*c07aea3eSMatteo Croce /********** net/core/page_pool.c **********/ 82*c07aea3eSMatteo Croce #define PP_SIGNATURE (0x40 + POISON_POINTER_DELTA) 83*c07aea3eSMatteo Croce 84c9cf5528SRandy Dunlap #endif 85