From: John Johansen <john.johansen@canonical.com>
Date: Tue, 28 Jun 2011 14:06:38 +0000 (+0100)
Subject: AppArmor: Fix reference to rcu protected pointer outside of rcu_read_lock
X-Git-Tag: v3.1-rc1~133^2~27^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=04fdc099f9c80c7775dbac388fc97e156d4d47e7;p=pandora-kernel.git

AppArmor: Fix reference to rcu protected pointer outside of rcu_read_lock

The pointer returned from tracehook_tracer_task() is only valid inside
the rcu_read_lock.  However the tracer pointer obtained is being passed
to aa_may_ptrace outside of the rcu_read_lock critical section.

Mover the aa_may_ptrace test into the rcu_read_lock critical section, to
fix this.

Kernels affected: 2.6.36 - 3.0

Reported-by: Oleg Nesterov <oleg@redhat.com>
Cc: stable@kernel.org
Signed-off-by: John Johansen <john.johansen@canonical.com>
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