| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _LINUX_POISON_H |
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| 3 | #define _LINUX_POISON_H |
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| 4 | |
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| 5 | /********** include/linux/list.h **********/ |
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| 6 | |
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| 7 | /* |
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| 8 | * Architectures might want to move the poison pointer offset |
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| 9 | * into some well-recognized area such as 0xdead000000000000, |
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| 10 | * that is also not mappable by user-space exploits: |
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| 11 | */ |
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| 12 | #ifdef CONFIG_ILLEGAL_POINTER_VALUE |
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| 13 | # define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL) |
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| 14 | #else |
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| 15 | # define POISON_POINTER_DELTA 0 |
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| 16 | #endif |
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| 17 | |
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| 18 | /* |
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| 19 | * These are non-NULL pointers that will result in page faults |
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| 20 | * under normal circumstances, used to verify that nobody uses |
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| 21 | * non-initialized list entries. |
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| 22 | */ |
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| 23 | #define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA) |
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| 24 | #define LIST_POISON2 ((void *) 0x122 + POISON_POINTER_DELTA) |
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| 25 | |
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| 26 | /********** include/linux/timer.h **********/ |
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| 27 | #define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) |
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| 28 | |
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| 29 | /********** mm/page_poison.c **********/ |
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| 30 | #define PAGE_POISON 0xaa |
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| 31 | |
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| 32 | /********** mm/page_alloc.c ************/ |
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| 33 | |
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| 34 | #define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) |
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| 35 | |
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| 36 | /********** mm/slab.c **********/ |
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| 37 | /* |
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| 38 | * Magic nums for obj red zoning. |
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| 39 | * Placed in the first word before and the first word after an obj. |
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| 40 | */ |
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| 41 | #define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */ |
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| 42 | #define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */ |
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| 43 | |
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| 44 | #define SLUB_RED_INACTIVE 0xbb |
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| 45 | #define SLUB_RED_ACTIVE 0xcc |
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| 46 | |
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| 47 | /* ...and for poisoning */ |
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| 48 | #define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ |
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| 49 | #define POISON_FREE 0x6b /* for use-after-free poisoning */ |
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| 50 | #define POISON_END 0xa5 /* end-byte of poisoning */ |
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| 51 | |
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| 52 | /********** arch/$ARCH/mm/init.c **********/ |
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| 53 | #define POISON_FREE_INITMEM 0xcc |
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| 54 | |
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| 55 | /********** arch/ia64/hp/common/sba_iommu.c **********/ |
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| 56 | /* |
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| 57 | * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a |
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| 58 | * value of "SBAIOMMU POISON\0" for spill-over poisoning. |
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| 59 | */ |
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| 60 | |
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| 61 | /********** fs/jbd/journal.c **********/ |
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| 62 | #define JBD_POISON_FREE 0x5b |
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| 63 | #define JBD2_POISON_FREE 0x5c |
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| 64 | |
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| 65 | /********** drivers/base/dmapool.c **********/ |
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| 66 | #define POOL_POISON_FREED 0xa7 /* !inuse */ |
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| 67 | #define POOL_POISON_ALLOCATED 0xa9 /* !initted */ |
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| 68 | |
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| 69 | /********** drivers/atm/ **********/ |
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| 70 | #define ATM_POISON_FREE 0x12 |
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| 71 | #define ATM_POISON 0xdeadbeef |
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| 72 | |
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| 73 | /********** kernel/mutexes **********/ |
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| 74 | #define MUTEX_DEBUG_INIT 0x11 |
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| 75 | #define MUTEX_DEBUG_FREE 0x22 |
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| 76 | #define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA) |
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| 77 | |
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| 78 | /********** security/ **********/ |
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| 79 | #define KEY_DESTROY 0xbd |
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| 80 | |
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| 81 | /********** net/core/page_pool.c **********/ |
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| 82 | #define PP_SIGNATURE (0x40 + POISON_POINTER_DELTA) |
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| 83 | |
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| 84 | /********** net/core/skbuff.c **********/ |
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| 85 | #define SKB_LIST_POISON_NEXT ((void *)(0x800 + POISON_POINTER_DELTA)) |
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| 86 | /********** net/ **********/ |
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| 87 | #define NET_PTR_POISON ((void *)(0x801 + POISON_POINTER_DELTA)) |
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| 88 | |
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| 89 | /********** kernel/bpf/ **********/ |
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| 90 | #define BPF_PTR_POISON ((void *)(0xeB9FUL + POISON_POINTER_DELTA)) |
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| 91 | |
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| 92 | /********** VFS **********/ |
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| 93 | #define VFS_PTR_POISON ((void *)(0xF5 + POISON_POINTER_DELTA)) |
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| 94 | |
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| 95 | /********** lib/stackdepot.c **********/ |
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| 96 | #define STACK_DEPOT_POISON ((void *)(0xD390 + POISON_POINTER_DELTA)) |
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| 97 | |
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| 98 | #endif |
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| 99 | |
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