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Message-ID: <20150726134519.GA1111@cachalot>
Date: Sun, 26 Jul 2015 16:45:19 +0300
From: Vasily Kulikov <segoon@...nwall.com>
To: linux-kernel@...r.kernel.org
Cc: Randy Dunlap <rdunlap@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
kernel-hardening@...ts.openwall.com,
Thomas Gleixner <tglx@...utronix.de>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 2/3] 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@...nwall.com>
---
include/linux/poison.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/linux/poison.h b/include/linux/poison.h
index ee697b9..a721bcd 100644
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -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 **********/
/*
--
2.1.0
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