From: Christopher Yeoh <cyeoh@au1.ibm.com>
Date: Thu, 2 Feb 2012 01:04:09 +0000 (+1030)
Subject: Fix race in process_vm_rw_core
X-Git-Tag: v3.3-rc3~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8cdb878dcb359fd1137e9abdee9322f5e9bcfdf8;p=pandora-kernel.git

Fix race in process_vm_rw_core

This fixes the race in process_vm_core found by Oleg (see

  http://article.gmane.org/gmane.linux.kernel/1235667/

for details).

This has been updated since I last sent it as the creation of the new
mm_access() function did almost exactly the same thing as parts of the
previous version of this patch did.

In order to use mm_access() even when /proc isn't enabled, we move it to
kernel/fork.c where other related process mm access functions already
are.

Signed-off-by: Chris Yeoh <yeohc@au1.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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