/etc/apparmor.d/abstractions/dbus is in apparmor 2.7.102-0ubuntu3.11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # vim:syntax=apparmor
# ------------------------------------------------------------------
#
# Copyright (C) 2009-2010 Canonical Ltd.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
# System socket. Be careful when including this abstraction.
/{,var/}run/dbus/system_bus_socket w,
|