From 18f661bcf898742212182d75f22f05b048cc04bb Mon Sep 17 00:00:00 2001
From: Stephen Wilson <wilsons@start.ca>
Date: Sun, 13 Mar 2011 15:49:22 -0400
Subject: [PATCH] proc: hold cred_guard_mutex in check_mem_permission()

Avoid a potential race when task exec's and we get a new ->mm but check against
the old credentials in ptrace_may_access().

Holding of the mutex is implemented by factoring out the body of the code into a
helper function __check_mem_permission().  Performing this factorization now
simplifies upcoming changes and minimizes churn in the diff's.

Signed-off-by: Stephen Wilson <wilsons@start.ca>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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