The thing returned by SO_PEERSEC (which we're calling LinuxSecurityLabel
within D-Bus) can have a different meaning for each LSM. In AppArmor
it's the AppArmor context, which is made up of an AppArmor label and an
optional confinement mode; the label further subdivides into one
or more profiles. See
https://bazaar.launchpad.net/~apparmor-dev/apparmor/master/revision/2862
and subsequent commits for recent clarification of this terminology.

In practice, the part that dbus-daemon deals with is the label,
and occasionally also the mode.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=75113Reviewed-by: Tyler Hicks <tyhicks@canonical.com>