7a5c39c156
This reverts commit 4f51fb0d25 which is
commit ee62ce7a1d909ccba0399680a03c2dee83bcae95 upstream.
It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.
Bug: 161946584
Change-Id: I1778b757059df295816de520022729e7ab7348a1
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_POISON_H
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#define _LINUX_POISON_H
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/********** include/linux/list.h **********/
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/*
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* Architectures might want to move the poison pointer offset
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* into some well-recognized area such as 0xdead000000000000,
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* that is also not mappable by user-space exploits:
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*/
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#ifdef CONFIG_ILLEGAL_POINTER_VALUE
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# define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
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#else
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# define POISON_POINTER_DELTA 0
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#endif
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/*
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* These are non-NULL pointers that will result in page faults
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* under normal circumstances, used to verify that nobody uses
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* non-initialized list entries.
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*/
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#define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
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#define LIST_POISON2 ((void *) 0x122 + POISON_POINTER_DELTA)
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/********** include/linux/timer.h **********/
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#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
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/********** mm/page_poison.c **********/
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#define PAGE_POISON 0xaa
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/********** mm/page_alloc.c ************/
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#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
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/********** mm/slab.c **********/
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/*
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* Magic nums for obj red zoning.
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* Placed in the first word before and the first word after an obj.
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*/
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#define SLUB_RED_INACTIVE 0xbb /* when obj is inactive */
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#define SLUB_RED_ACTIVE 0xcc /* when obj is active */
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/* ...and for poisoning */
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#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
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#define POISON_FREE 0x6b /* for use-after-free poisoning */
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#define POISON_END 0xa5 /* end-byte of poisoning */
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/********** arch/$ARCH/mm/init.c **********/
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#define POISON_FREE_INITMEM 0xcc
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/********** fs/jbd/journal.c **********/
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#define JBD_POISON_FREE 0x5b
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#define JBD2_POISON_FREE 0x5c
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/********** drivers/base/dmapool.c **********/
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#define POOL_POISON_FREED 0xa7 /* !inuse */
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#define POOL_POISON_ALLOCATED 0xa9 /* !initted */
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/********** drivers/atm/ **********/
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#define ATM_POISON_FREE 0x12
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#define ATM_POISON 0xdeadbeef
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/********** kernel/mutexes **********/
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#define MUTEX_DEBUG_INIT 0x11
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#define MUTEX_DEBUG_FREE 0x22
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#define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA)
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/********** security/ **********/
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#define KEY_DESTROY 0xbd
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/********** net/core/page_pool.c **********/
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#define PP_SIGNATURE (0x40 + POISON_POINTER_DELTA)
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/********** net/core/skbuff.c **********/
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#define SKB_LIST_POISON_NEXT ((void *)(0x800 + POISON_POINTER_DELTA))
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/********** net/ **********/
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#define NET_PTR_POISON ((void *)(0x801 + POISON_POINTER_DELTA))
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/********** kernel/bpf/ **********/
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#define BPF_PTR_POISON ((void *)(0xeB9FUL + POISON_POINTER_DELTA))
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/********** VFS **********/
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#define VFS_PTR_POISON ((void *)(0xF5 + POISON_POINTER_DELTA))
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/********** lib/stackdepot.c **********/
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#define STACK_DEPOT_POISON ((void *)(0xD390 + POISON_POINTER_DELTA))
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#endif
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