From: Helge Deller <deller@gmx.de>
Date: Sat, 29 Jun 2013 12:03:14 +0000 (+0200)
Subject: parisc: implement full version of access_ok()
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~47^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=63379c135331c724d40a87b98eb62d2122981341;p=pandora-kernel.git

parisc: implement full version of access_ok()

Up to now PA-RISC could live with a trivial version of access_ok().
Our fault handlers can correctly handle fault cases.

But testcases showed that we need a better access check else we won't
always return correct errno failure codes to userspace.

Problem showed up during 32bit userspace tests in which writev() used a
32bit memory area and length which would then wrap around on 64bit
kernel.

Signed-off-by: Helge Deller <deller@gmx.de>
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