Commit b8a0255d authored Jan 15, 2016 by Vasily Kulikov Committed by Linus Torvalds Jan 16, 2016

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



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>

parent 6611d8d7

include/linux/poison.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -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 ********/
		/*