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: v4.1.9~144
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=1bcc586eae97f5dfb9249c2d8c9406f0f8da57ae;p=users%2Fjedix%2Flinux-maple.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 7796af4b1d6f..99fe93a5021f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -101,6 +101,10 @@ config NO_IOPORT_MAP
 config STACKTRACE_SUPPORT
 	def_bool y
 
+config ILLEGAL_POINTER_VALUE
+	hex
+	default 0xdead000000000000
+
 config LOCKDEP_SUPPORT
 	def_bool y