tools/include/linux/poison.h

   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 #ifdef __cplusplus
  19 #define LIST_POISON1  NULL
  20 #define LIST_POISON2  NULL
  21 #else
  22 /*
  23  * These are non-NULL pointers that will result in page faults
  24  * under normal circumstances, used to verify that nobody uses
  25  * non-initialized list entries.
  26  */
  27 #define LIST_POISON1  ((void *) 0x100 + POISON_POINTER_DELTA)
  28 #define LIST_POISON2  ((void *) 0x200 + POISON_POINTER_DELTA)
  29 #endif
  30
  31 /********** include/linux/timer.h **********/
  32 /*
  33  * Magic number "tsta" to indicate a static timer initializer
  34  * for the object debugging code.
  35  */
  36 #define TIMER_ENTRY_STATIC      ((void *) 0x300 + POISON_POINTER_DELTA)
  37
  38 /********** mm/page_poison.c **********/
  39 #define PAGE_POISON 0xaa
  40
  41 /********** mm/page_alloc.c ************/
  42
  43 #define TAIL_MAPPING    ((void *) 0x400 + POISON_POINTER_DELTA)
  44
  45 /********** mm/slab.c **********/
  46 /*
  47  * Magic nums for obj red zoning.
  48  * Placed in the first word before and the first word after an obj.
  49  */
  50 #define SLUB_RED_INACTIVE       0xbb    /* when obj is inactive */
  51 #define SLUB_RED_ACTIVE         0xcc    /* when obj is active */
  52
  53 /* ...and for poisoning */
  54 #define POISON_INUSE    0x5a    /* for use-uninitialised poisoning */
  55 #define POISON_FREE     0x6b    /* for use-after-free poisoning */
  56 #define POISON_END      0xa5    /* end-byte of poisoning */
  57
  58 /********** arch/$ARCH/mm/init.c **********/
  59 #define POISON_FREE_INITMEM     0xcc
  60
  61 /********** arch/ia64/hp/common/sba_iommu.c **********/
  62 /*
  63  * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
  64  * value of "SBAIOMMU POISON\0" for spill-over poisoning.
  65  */
  66
  67 /********** fs/jbd/journal.c **********/
  68 #define JBD_POISON_FREE         0x5b
  69 #define JBD2_POISON_FREE        0x5c
  70
  71 /********** drivers/base/dmapool.c **********/
  72 #define POOL_POISON_FREED       0xa7    /* !inuse */
  73 #define POOL_POISON_ALLOCATED   0xa9    /* !initted */
  74
  75 /********** drivers/atm/ **********/
  76 #define ATM_POISON_FREE         0x12
  77 #define ATM_POISON              0xdeadbeef
  78
  79 /********** kernel/mutexes **********/
  80 #define MUTEX_DEBUG_INIT        0x11
  81 #define MUTEX_DEBUG_FREE        0x22
  82
  83 /********** security/ **********/
  84 #define KEY_DESTROY             0xbd
  85
  86 #endif