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) 248a5e5e02SVasily Kulikov #define LIST_POISON2 ((void *) 0x200 + POISON_POINTER_DELTA) 25c9cf5528SRandy Dunlap 26c6f3a97fSThomas Gleixner /********** include/linux/timer.h **********/ 27c6f3a97fSThomas Gleixner /* 28c6f3a97fSThomas Gleixner * Magic number "tsta" to indicate a static timer initializer 29c6f3a97fSThomas Gleixner * for the object debugging code. 30c6f3a97fSThomas Gleixner */ 31b8a0255dSVasily Kulikov #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) 32c6f3a97fSThomas Gleixner 33*6d2bef9dSMichael S. Tsirkin /********** mm/page_poison.c **********/ 341414c7f4SLaura Abbott #ifdef CONFIG_PAGE_POISONING_ZERO 351414c7f4SLaura Abbott #define PAGE_POISON 0x00 361414c7f4SLaura Abbott #else 376a11f75bSAkinobu Mita #define PAGE_POISON 0xaa 381414c7f4SLaura Abbott #endif 396a11f75bSAkinobu Mita 401c290f64SKirill A. Shutemov /********** mm/page_alloc.c ************/ 411c290f64SKirill A. Shutemov 42b8a0255dSVasily Kulikov #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) 431c290f64SKirill A. Shutemov 44c9cf5528SRandy Dunlap /********** mm/slab.c **********/ 45c9cf5528SRandy Dunlap /* 46c9cf5528SRandy Dunlap * Magic nums for obj red zoning. 47c9cf5528SRandy Dunlap * Placed in the first word before and the first word after an obj. 48c9cf5528SRandy Dunlap */ 49b46b8f19SDavid Woodhouse #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */ 50b46b8f19SDavid Woodhouse #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */ 51c9cf5528SRandy Dunlap 5281819f0fSChristoph Lameter #define SLUB_RED_INACTIVE 0xbb 5381819f0fSChristoph Lameter #define SLUB_RED_ACTIVE 0xcc 5481819f0fSChristoph Lameter 55c9cf5528SRandy Dunlap /* ...and for poisoning */ 56c9cf5528SRandy Dunlap #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ 57c9cf5528SRandy Dunlap #define POISON_FREE 0x6b /* for use-after-free poisoning */ 58c9cf5528SRandy Dunlap #define POISON_END 0xa5 /* end-byte of poisoning */ 59c9cf5528SRandy Dunlap 60c9cf5528SRandy Dunlap /********** arch/$ARCH/mm/init.c **********/ 61c9cf5528SRandy Dunlap #define POISON_FREE_INITMEM 0xcc 62c9cf5528SRandy Dunlap 63c9cf5528SRandy Dunlap /********** arch/ia64/hp/common/sba_iommu.c **********/ 64c9cf5528SRandy Dunlap /* 65c9cf5528SRandy Dunlap * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a 66c9cf5528SRandy Dunlap * value of "SBAIOMMU POISON\0" for spill-over poisoning. 67c9cf5528SRandy Dunlap */ 68c9cf5528SRandy Dunlap 69c9cf5528SRandy Dunlap /********** fs/jbd/journal.c **********/ 70c9cf5528SRandy Dunlap #define JBD_POISON_FREE 0x5b 71cd02ff0bSMingming Cao #define JBD2_POISON_FREE 0x5c 72c9cf5528SRandy Dunlap 73c9cf5528SRandy Dunlap /********** drivers/base/dmapool.c **********/ 74c9cf5528SRandy Dunlap #define POOL_POISON_FREED 0xa7 /* !inuse */ 75c9cf5528SRandy Dunlap #define POOL_POISON_ALLOCATED 0xa9 /* !initted */ 76c9cf5528SRandy Dunlap 77b3c681e0SRandy Dunlap /********** drivers/atm/ **********/ 78b3c681e0SRandy Dunlap #define ATM_POISON_FREE 0x12 793c6b3773SRandy Dunlap #define ATM_POISON 0xdeadbeef 80b3c681e0SRandy Dunlap 81a7807a32SRandy Dunlap /********** kernel/mutexes **********/ 82a7807a32SRandy Dunlap #define MUTEX_DEBUG_INIT 0x11 83a7807a32SRandy Dunlap #define MUTEX_DEBUG_FREE 0x22 84977625a6SNicolai Hähnle #define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA) 85a7807a32SRandy Dunlap 8619da3dd1SDavid Rientjes /********** lib/flex_array.c **********/ 8719da3dd1SDavid Rientjes #define FLEX_ARRAY_FREE 0x6c /* for use-after-free poisoning */ 8819da3dd1SDavid Rientjes 89a7807a32SRandy Dunlap /********** security/ **********/ 90a7807a32SRandy Dunlap #define KEY_DESTROY 0xbd 91a7807a32SRandy Dunlap 92c9cf5528SRandy Dunlap #endif 93