tree 68ad93832badef6bd961831f9d36a603bc6e1678
parent e73ff29041b5f8991ef81669a1a9f0553d14766a
author John Johansen <john.johansen@canonical.com> 1309269998 +0100
committer Greg Kroah-Hartman <gregkh@suse.de> 1312520321 -0700

AppArmor: Fix reference to rcu protected pointer outside of rcu_read_lock

commit 04fdc099f9c80c7775dbac388fc97e156d4d47e7 upstream.

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>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>