From: Kees Cook <keescook@chromium.org>
Date: Fri, 4 Apr 2014 00:28:11 +0000 (-0700)
Subject: ARM: mm: allow non-text sections to be non-executable
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~102^2^2^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1e6b48116a95046ec51f3d40f83aff8b006674d7;p=pandora-kernel.git

ARM: mm: allow non-text sections to be non-executable

Adds CONFIG_ARM_KERNMEM_PERMS to separate the kernel memory regions
into section-sized areas that can have different permisions. Performs
the NX permission changes during free_initmem, so that init memory can be
reclaimed.

This uses section size instead of PMD size to reduce memory lost to
padding on non-LPAE systems.

Based on work by Brad Spengler, Larry Bassel, and Laura Abbott.

Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Laura Abbott <lauraa@codeaurora.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
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