From: Helge Deller <deller@gmx.de>
Date: Fri, 8 Apr 2016 16:18:48 +0000 (+0200)
Subject: parisc: Fix kernel crash with reversed copy_from_user()
X-Git-Tag: v3.2.80~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e5c1b752c46b2bc61aa81f23b5a10f3a97bda76;p=pandora-kernel.git

parisc: Fix kernel crash with reversed copy_from_user()

commit ef72f3110d8b19f4c098a0bff7ed7d11945e70c6 upstream.

The kernel module testcase (lib/test_user_copy.c) exhibited a kernel
crash on parisc if the parameters for copy_from_user were reversed
("illegal reversed copy_to_user" testcase).

Fix this potential crash by checking the fault handler if the faulting
address is in the exception table.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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