1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _LINUX_POISON_H 3*4882a593Smuzhiyun #define _LINUX_POISON_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun /********** include/linux/list.h **********/ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun /* 8*4882a593Smuzhiyun * Architectures might want to move the poison pointer offset 9*4882a593Smuzhiyun * into some well-recognized area such as 0xdead000000000000, 10*4882a593Smuzhiyun * that is also not mappable by user-space exploits: 11*4882a593Smuzhiyun */ 12*4882a593Smuzhiyun #ifdef CONFIG_ILLEGAL_POINTER_VALUE 13*4882a593Smuzhiyun # define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL) 14*4882a593Smuzhiyun #else 15*4882a593Smuzhiyun # define POISON_POINTER_DELTA 0 16*4882a593Smuzhiyun #endif 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun /* 19*4882a593Smuzhiyun * These are non-NULL pointers that will result in page faults 20*4882a593Smuzhiyun * under normal circumstances, used to verify that nobody uses 21*4882a593Smuzhiyun * non-initialized list entries. 22*4882a593Smuzhiyun */ 23*4882a593Smuzhiyun #define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA) 24*4882a593Smuzhiyun #define LIST_POISON2 ((void *) 0x122 + POISON_POINTER_DELTA) 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun /********** include/linux/timer.h **********/ 27*4882a593Smuzhiyun #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun /********** mm/page_poison.c **********/ 30*4882a593Smuzhiyun #define PAGE_POISON 0xaa 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun /********** mm/page_alloc.c ************/ 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun /********** mm/slab.c **********/ 37*4882a593Smuzhiyun /* 38*4882a593Smuzhiyun * Magic nums for obj red zoning. 39*4882a593Smuzhiyun * Placed in the first word before and the first word after an obj. 40*4882a593Smuzhiyun */ 41*4882a593Smuzhiyun #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */ 42*4882a593Smuzhiyun #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */ 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun #define SLUB_RED_INACTIVE 0xbb 45*4882a593Smuzhiyun #define SLUB_RED_ACTIVE 0xcc 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun /* ...and for poisoning */ 48*4882a593Smuzhiyun #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ 49*4882a593Smuzhiyun #define POISON_FREE 0x6b /* for use-after-free poisoning */ 50*4882a593Smuzhiyun #define POISON_END 0xa5 /* end-byte of poisoning */ 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun /********** arch/$ARCH/mm/init.c **********/ 53*4882a593Smuzhiyun #define POISON_FREE_INITMEM 0xcc 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun /********** arch/ia64/hp/common/sba_iommu.c **********/ 56*4882a593Smuzhiyun /* 57*4882a593Smuzhiyun * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a 58*4882a593Smuzhiyun * value of "SBAIOMMU POISON\0" for spill-over poisoning. 59*4882a593Smuzhiyun */ 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun /********** fs/jbd/journal.c **********/ 62*4882a593Smuzhiyun #define JBD_POISON_FREE 0x5b 63*4882a593Smuzhiyun #define JBD2_POISON_FREE 0x5c 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun /********** drivers/base/dmapool.c **********/ 66*4882a593Smuzhiyun #define POOL_POISON_FREED 0xa7 /* !inuse */ 67*4882a593Smuzhiyun #define POOL_POISON_ALLOCATED 0xa9 /* !initted */ 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun /********** drivers/atm/ **********/ 70*4882a593Smuzhiyun #define ATM_POISON_FREE 0x12 71*4882a593Smuzhiyun #define ATM_POISON 0xdeadbeef 72*4882a593Smuzhiyun 73*4882a593Smuzhiyun /********** kernel/mutexes **********/ 74*4882a593Smuzhiyun #define MUTEX_DEBUG_INIT 0x11 75*4882a593Smuzhiyun #define MUTEX_DEBUG_FREE 0x22 76*4882a593Smuzhiyun #define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA) 77*4882a593Smuzhiyun 78*4882a593Smuzhiyun /********** security/ **********/ 79*4882a593Smuzhiyun #define KEY_DESTROY 0xbd 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun #endif 82