From: Stephen Wilson <wilsons@start.ca>
Date: Sun, 13 Mar 2011 19:49:22 +0000 (-0400)
Subject: proc: hold cred_guard_mutex in check_mem_permission()
X-Git-Tag: v2.6.39-rc1~99^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=18f661bcf898742212182d75f22f05b048cc04bb;p=pandora-kernel.git

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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