linux-kernel - [PATCH 3.16.y-ckt 051/133] arm64: kconfig: Move LIST

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Date:	Wed, 30 Sep 2015 10:49:59 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Thierry Strudel <tstrudel@...gle.com>,
	Jeff Vander Stoep <jeffv@...gle.com>,
	Will Deacon <will.deacon@....com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 051/133] arm64: kconfig: Move LIST_POISON to a safe value

3.16.7-ckt18 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jeff Vander Stoep <jeffv@...gle.com>

commit bf0c4e04732479f650ff59d1ee82de761c0071f0 upstream.

Move the poison pointer offset to 0xdead000000000000, a
recognized value that is not mappable by user-space exploits.

Acked-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Thierry Strudel <tstrudel@...gle.com>
Signed-off-by: Jeff Vander Stoep <jeffv@...gle.com>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 arch/arm64/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 839f48c26ef0..316ed8cf5bc0 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -81,6 +81,10 @@ config NO_IOPORT_MAP
 config STACKTRACE_SUPPORT
 	def_bool y
 
+config ILLEGAL_POINTER_VALUE
+	hex
+	default 0xdead000000000000
+
 config LOCKDEP_SUPPORT
 	def_bool y
 
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