include/linux/poison.h

   1 #ifndef _LINUX_POISON_H
   2 #define _LINUX_POISON_H
   3
   4 /********** include/linux/list.h **********/
   5
   6 /*
   7  * Architectures might want to move the poison pointer offset
   8  * into some well-recognized area such as 0xdead000000000000,
   9  * that is also not mappable by user-space exploits:
  10  */
  11 #ifdef CONFIG_ILLEGAL_POINTER_VALUE
  12 # define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
  13 #else
  14 # define POISON_POINTER_DELTA 0
  15 #endif
  16
  17 /*
  18  * These are non-NULL pointers that will result in page faults
  19  * under normal circumstances, used to verify that nobody uses
  20  * non-initialized list entries.
  21  */
  22 #define LIST_POISON1  ((void *) 0x100 + POISON_POINTER_DELTA)
  23 #define LIST_POISON2  ((void *) 0x200 + POISON_POINTER_DELTA)
  24
  25 /********** include/linux/timer.h **********/
  26 /*
  27  * Magic number "tsta" to indicate a static timer initializer
  28  * for the object debugging code.
  29  */
  30 #define TIMER_ENTRY_STATIC      ((void *) 0x300 + POISON_POINTER_DELTA)
  31
  32 /********** mm/debug-pagealloc.c **********/
  33 #ifdef CONFIG_PAGE_POISONING_ZERO
  34 #define PAGE_POISON 0x00
  35 #else
  36 #define PAGE_POISON 0xaa
  37 #endif
  38
  39 /********** mm/page_alloc.c ************/
  40
  41 #define TAIL_MAPPING    ((void *) 0x400 + POISON_POINTER_DELTA)
  42
  43 /********** mm/slab.c **********/
  44 /*
  45  * Magic nums for obj red zoning.
  46  * Placed in the first word before and the first word after an obj.
  47  */
  48 #define RED_INACTIVE    0x09F911029D74E35BULL   /* when obj is inactive */
  49 #define RED_ACTIVE      0xD84156C5635688C0ULL   /* when obj is active */
  50
  51 #define SLUB_RED_INACTIVE       0xbb
  52 #define SLUB_RED_ACTIVE         0xcc
  53
  54 /* ...and for poisoning */
  55 #define POISON_INUSE    0x5a    /* for use-uninitialised poisoning */
  56 #define POISON_FREE     0x6b    /* for use-after-free poisoning */
  57 #define POISON_END      0xa5    /* end-byte of poisoning */
  58
  59 /********** arch/$ARCH/mm/init.c **********/
  60 #define POISON_FREE_INITMEM     0xcc
  61
  62 /********** arch/ia64/hp/common/sba_iommu.c **********/
  63 /*
  64  * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
  65  * value of "SBAIOMMU POISON\0" for spill-over poisoning.
  66  */
  67
  68 /********** fs/jbd/journal.c **********/
  69 #define JBD_POISON_FREE         0x5b
  70 #define JBD2_POISON_FREE        0x5c
  71
  72 /********** drivers/base/dmapool.c **********/
  73 #define POOL_POISON_FREED       0xa7    /* !inuse */
  74 #define POOL_POISON_ALLOCATED   0xa9    /* !initted */
  75
  76 /********** drivers/atm/ **********/
  77 #define ATM_POISON_FREE         0x12
  78 #define ATM_POISON              0xdeadbeef
  79
  80 /********** kernel/mutexes **********/
  81 #define MUTEX_DEBUG_INIT        0x11
  82 #define MUTEX_DEBUG_FREE        0x22
  83
  84 /********** lib/flex_array.c **********/
  85 #define FLEX_ARRAY_FREE 0x6c    /* for use-after-free poisoning */
  86
  87 /********** security/ **********/
  88 #define KEY_DESTROY             0xbd
  89
  90 #endif