From: Nathan Lynch <nathan_lynch@mentor.com>
Date: Mon, 22 Sep 2014 21:12:35 +0000 (+0100)
Subject: ARM: 8155/1: place sigpage at a random offset above stack
X-Git-Tag: fixes-for-v3.18-merge-window~22^2^4~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=389522b0c0530658eb9f9a53410ec2494616d785;p=pandora-kernel.git

ARM: 8155/1: place sigpage at a random offset above stack

The sigpage is currently placed alongside shared libraries etc in the
address space.  Similar to what x86_64 does for its VDSO, place the
sigpage at a randomized offset above the stack so that learning the
base address of the sigpage doesn't help expose where shared libraries
are loaded in the address space (and vice versa).

Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

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