apparmor: make signal label match work when matching stacked labels

apparmor: make signal label match work when matching stacked labels

BugLink: http://bugs.launchpad.net/bugs/1763427
Given a label with a profile stack of
    A//&B or A//&C ...

A ptrace rule should be able to specify a generic trace pattern with
a rule like

    signal send A//&**,

however this is failing because while the correct label match routine
is called, it is being done post label decomposition so it is always
being done against a profile instead of the stacked label.

To fix this refactor the cross check to pass the full peer label in to
the label_match.

Signed-off-by: John Johansen <john.johansen@canonical.com>
(cherry picked from commit 3dc6b1ce6861ebf40b68ab4b752a05584a1f99bf
 git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor)
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>