From: Jeff Vander Stoep <jeffv@google.com>
Date: Tue, 18 Aug 2015 19:50:10 +0000 (+0100)
Subject: arm64: kconfig: Move LIST_POISON to a safe value
X-Git-Tag: firefly_0821_release~3679^2~123
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f828609ff36c1180c06e307d2c51d4ede337f7da;p=firefly-linux-kernel-4.4.55.git

arm64: kconfig: Move LIST_POISON to a safe value

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@arm.com>
Signed-off-by: Thierry Strudel <tstrudel@google.com>
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 0677ff4814fa..661ccf87b9ad 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -56,6 +56,10 @@ config NO_IOPORT
 config STACKTRACE_SUPPORT
 	def_bool y
 
+config ILLEGAL_POINTER_VALUE
+	hex
+	default 0xdead000000000000
+
 config LOCKDEP_SUPPORT
 	def_bool y