[mirror_ubuntu-bionic-kernel.git] / include / linux / poison.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_POISON_H
#define _LINUX_POISON_H

/********** include/linux/list.h **********/

/*
 * Architectures might want to move the poison pointer offset
 * into some well-recognized area such as 0xdead000000000000,
 * that is also not mappable by user-space exploits:
 */
#ifdef CONFIG_ILLEGAL_POINTER_VALUE
# define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
#else
# define POISON_POINTER_DELTA 0
#endif

/*
 * These are non-NULL pointers that will result in page faults
 * under normal circumstances, used to verify that nobody uses
 * non-initialized list entries.
 */
#define LIST_POISON1  ((void *) 0x100 + POISON_POINTER_DELTA)
#define LIST_POISON2  ((void *) 0x200 + POISON_POINTER_DELTA)

/********** include/linux/timer.h **********/
/*
 * Magic number "tsta" to indicate a static timer initializer
 * for the object debugging code.
 */
#define TIMER_ENTRY_STATIC	((void *) 0x300 + POISON_POINTER_DELTA)

/********** mm/debug-pagealloc.c **********/
#ifdef CONFIG_PAGE_POISONING_ZERO
#define PAGE_POISON 0x00
#else
#define PAGE_POISON 0xaa
#endif

/********** mm/page_alloc.c ************/

#define TAIL_MAPPING	((void *) 0x400 + POISON_POINTER_DELTA)

/********** mm/slab.c **********/
/*
 * Magic nums for obj red zoning.
 * Placed in the first word before and the first word after an obj.
 */
#define	RED_INACTIVE	0x09F911029D74E35BULL	/* when obj is inactive */
#define	RED_ACTIVE	0xD84156C5635688C0ULL	/* when obj is active */

#define SLUB_RED_INACTIVE	0xbb
#define SLUB_RED_ACTIVE		0xcc

/* ...and for poisoning */
#define	POISON_INUSE	0x5a	/* for use-uninitialised poisoning */
#define POISON_FREE	0x6b	/* for use-after-free poisoning */
#define	POISON_END	0xa5	/* end-byte of poisoning */

/********** arch/$ARCH/mm/init.c **********/
#define POISON_FREE_INITMEM	0xcc

/********** arch/ia64/hp/common/sba_iommu.c **********/
/*
 * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
 * value of "SBAIOMMU POISON\0" for spill-over poisoning.
 */

/********** fs/jbd/journal.c **********/
#define JBD_POISON_FREE		0x5b
#define JBD2_POISON_FREE	0x5c

/********** drivers/base/dmapool.c **********/
#define	POOL_POISON_FREED	0xa7	/* !inuse */
#define	POOL_POISON_ALLOCATED	0xa9	/* !initted */

/********** drivers/atm/ **********/
#define ATM_POISON_FREE		0x12
#define ATM_POISON		0xdeadbeef

/********** kernel/mutexes **********/
#define MUTEX_DEBUG_INIT	0x11
#define MUTEX_DEBUG_FREE	0x22
#define MUTEX_POISON_WW_CTX	((void *) 0x500 + POISON_POINTER_DELTA)

/********** lib/flex_array.c **********/
#define FLEX_ARRAY_FREE	0x6c	/* for use-after-free poisoning */

/********** security/ **********/
#define KEY_DESTROY		0xbd

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
c9cf5528 RD	2	#ifndef _LINUX_POISON_H
	3	#define _LINUX_POISON_H
	4
	5	/******** include/linux/list.h ********/
a29815a3 AK	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
c9cf5528 RD	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	*/
8a5e5e02 VK	23	#define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
8a5e5e02 VK	24	#define LIST_POISON2 ((void *) 0x200 + POISON_POINTER_DELTA)
c9cf5528	25
c6f3a97f TG	26	/******** include/linux/timer.h ********/
	27	/*
	28	* Magic number "tsta" to indicate a static timer initializer
	29	* for the object debugging code.
	30	*/
b8a0255d	31	#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
c6f3a97f	32
6a11f75b	33	/******** mm/debug-pagealloc.c ********/
1414c7f4 LA	34	#ifdef CONFIG_PAGE_POISONING_ZERO
	35	#define PAGE_POISON 0x00
	36	#else
6a11f75b	37	#define PAGE_POISON 0xaa
1414c7f4	38	#endif
6a11f75b	39
1c290f64 KS	40	/******** mm/page_alloc.c **********/
1c290f64 KS	41
b8a0255d	42	#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
1c290f64	43
c9cf5528 RD	44	/******** mm/slab.c ********/
	45	/*
	46	* Magic nums for obj red zoning.
	47	* Placed in the first word before and the first word after an obj.
	48	*/
b46b8f19 DW	49	#define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
b46b8f19 DW	50	#define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
c9cf5528	51
81819f0f CL	52	#define SLUB_RED_INACTIVE 0xbb
	53	#define SLUB_RED_ACTIVE 0xcc
	54
c9cf5528 RD	55	/* ...and for poisoning */
	56	#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
	57	#define POISON_FREE 0x6b /* for use-after-free poisoning */
	58	#define POISON_END 0xa5 /* end-byte of poisoning */
	59
	60	/******** arch/$ARCH/mm/init.c ********/
	61	#define POISON_FREE_INITMEM 0xcc
	62
c9cf5528 RD	63	/******** arch/ia64/hp/common/sba_iommu.c ********/
	64	/*
	65	* arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
	66	* value of "SBAIOMMU POISON\0" for spill-over poisoning.
	67	*/
	68
	69	/******** fs/jbd/journal.c ********/
cd02ff0b MC	70	#define JBD_POISON_FREE 0x5b
cd02ff0b MC	71	#define JBD2_POISON_FREE 0x5c
c9cf5528 RD	72
	73	/******** drivers/base/dmapool.c ********/
	74	#define POOL_POISON_FREED 0xa7 /* !inuse */
	75	#define POOL_POISON_ALLOCATED 0xa9 /* !initted */
	76
b3c681e0 RD	77	/******** drivers/atm/ ********/
b3c681e0 RD	78	#define ATM_POISON_FREE 0x12
3c6b3773	79	#define ATM_POISON 0xdeadbeef
b3c681e0	80
a7807a32 RD	81	/******** kernel/mutexes ********/
	82	#define MUTEX_DEBUG_INIT 0x11
	83	#define MUTEX_DEBUG_FREE 0x22
977625a6	84	#define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA)
a7807a32	85
19da3dd1 DR	86	/******** lib/flex_array.c ********/
	87	#define FLEX_ARRAY_FREE 0x6c /* for use-after-free poisoning */
	88
a7807a32 RD	89	/******** security/ ********/
	90	#define KEY_DESTROY 0xbd
	91
c9cf5528	92	#endif