LXR linux/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/*
  19 * These are non-NULL pointers that will result in page faults
  20 * under normal circumstances, used to verify that nobody uses
  21 * non-initialized list entries.
  22 */
  23#define LIST_POISON1  ((void *) 0x100 + POISON_POINTER_DELTA)
  24#define LIST_POISON2  ((void *) 0x122 + POISON_POINTER_DELTA)
  25
  26/********** include/linux/timer.h **********/
  27#define TIMER_ENTRY_STATIC      ((void *) 0x300 + POISON_POINTER_DELTA)
  28
  29/********** mm/page_poison.c **********/
  30#define PAGE_POISON 0xaa
  31
  32/********** mm/page_alloc.c ************/
  33
  34#define TAIL_MAPPING    ((void *) 0x400 + POISON_POINTER_DELTA)
  35
  36/********** mm/slab.c **********/
  37/*
  38 * Magic nums for obj red zoning.
  39 * Placed in the first word before and the first word after an obj.
  40 */
  41#define RED_INACTIVE    0x09F911029D74E35BULL   /* when obj is inactive */
  42#define RED_ACTIVE      0xD84156C5635688C0ULL   /* when obj is active */
  43
  44#define SLUB_RED_INACTIVE       0xbb
  45#define SLUB_RED_ACTIVE         0xcc
  46
  47/* ...and for poisoning */
  48#define POISON_INUSE    0x5a    /* for use-uninitialised poisoning */
  49#define POISON_FREE     0x6b    /* for use-after-free poisoning */
  50#define POISON_END      0xa5    /* end-byte of poisoning */
  51
  52/********** arch/$ARCH/mm/init.c **********/
  53#define POISON_FREE_INITMEM     0xcc
  54
  55/********** arch/ia64/hp/common/sba_iommu.c **********/
  56/*
  57 * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
  58 * value of "SBAIOMMU POISON\0" for spill-over poisoning.
  59 */
  60
  61/********** fs/jbd/journal.c **********/
  62#define JBD_POISON_FREE         0x5b
  63#define JBD2_POISON_FREE        0x5c
  64
  65/********** drivers/base/dmapool.c **********/
  66#define POOL_POISON_FREED       0xa7    /* !inuse */
  67#define POOL_POISON_ALLOCATED   0xa9    /* !initted */
  68
  69/********** drivers/atm/ **********/
  70#define ATM_POISON_FREE         0x12
  71#define ATM_POISON              0xdeadbeef
  72
  73/********** kernel/mutexes **********/
  74#define MUTEX_DEBUG_INIT        0x11
  75#define MUTEX_DEBUG_FREE        0x22
  76#define MUTEX_POISON_WW_CTX     ((void *) 0x500 + POISON_POINTER_DELTA)
  77
  78/********** security/ **********/
  79#define KEY_DESTROY             0xbd
  80
  81/********** net/core/page_pool.c **********/
  82#define PP_SIGNATURE            (0x40 + POISON_POINTER_DELTA)
  83
  84#endif
  85