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include/linux/poison.h: use POISON_POINTER_DELTA for poison pointers

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TIMER_ENTRY_STATIC and TAIL_MAPPING are defined as poison pointers which
should point to nowhere.  Redefine them using POISON_POINTER_DELTA
arithmetics to make sure they really point to non-mappable area declared
by the target architecture.

Signed-off-by: Vasily Kulikov <segoon@openwall.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Solar Designer <solar@openwall.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vasily Kulikov 2016-01-15 16:57:55 -08:00 committed by Linus Torvalds
parent 6611d8d761
commit b8a0255db9
1 changed files with 2 additions and 2 deletions
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4
include/linux/poison.h
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@ -27,14 +27,14 @@
* Magic number "tsta" to indicate a static timer initializer
* for the object debugging code.
*/
#define TIMER_ENTRY_STATIC ((void *) 0x74737461)
#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
/********** mm/debug-pagealloc.c **********/
#define PAGE_POISON 0xaa
/********** mm/page_alloc.c ************/
#define TAIL_MAPPING ((void *) 0x01014A11 + POISON_POINTER_DELTA)
#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
/********** mm/slab.c **********/
/*