/etc/apparmor.d/usr.lib.libvirt.virt-aa-helper is in libvirt-bin 1.2.2-0ubuntu13.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#include <tunables/global>
/usr/lib/libvirt/virt-aa-helper {
#include <abstractions/base>
#include <abstractions/user-tmp>
# needed for searching directories
capability dac_override,
capability dac_read_search,
# needed for when disk is on a network filesystem
network inet,
deny @{PROC}/[0-9]*/mounts r,
@{PROC}/[0-9]*/net/psched r,
owner @{PROC}/[0-9]*/status r,
@{PROC}/filesystems r,
# for hostdev
/sys/devices/ r,
/sys/devices/** r,
/sys/bus/usb/devices/ r,
/sys/bus/usb/devices/** r,
deny /dev/sd* r,
deny /dev/dm-* r,
deny /dev/mapper/ r,
deny /dev/mapper/* r,
/usr/lib/libvirt/virt-aa-helper mr,
/sbin/apparmor_parser Ux,
/etc/apparmor.d/libvirt/* r,
/etc/apparmor.d/libvirt/libvirt-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]* rw,
# For backingstore, virt-aa-helper needs to peek inside the disk image, so
# allow access to non-hidden files in @{HOME} as well as storage pools, and
# removable media and filesystems, and certain file extentions. A
# virt-aa-helper failure when checking a disk for backinsgstore is non-fatal
# (but obviously the backingstore won't be added).
audit deny @{HOME}/.* mrwkl,
audit deny @{HOME}/.*/ rw,
audit deny @{HOME}/.*/** mrwkl,
@{HOME}/ r,
@{HOME}/** r,
@{HOME}/.Private/** mrwlk,
@{HOMEDIRS}/.ecryptfs/*/.Private/** mrwlk,
/var/lib/libvirt/images/ r,
/var/lib/libvirt/images/** r,
/var/lib/nova/images/** r,
/var/lib/nova/instances/_base/** r,
/var/lib/nova/instances/snapshots/** r,
/var/lib/eucalyptus/instances/**/disk* r,
/var/lib/eucalyptus/instances/**/loader* r,
/var/lib/uvtool/libvirt/images/** r,
/{media,mnt,opt,srv}/** r,
/**.img r,
/**.qcow{,2} r,
/**.qed r,
/**.vmdk r,
/**.[iI][sS][oO] r,
/**/disk{,.*} r,
}
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