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Affected on kernel 3.13.0-21.43 and later on Trusty.

Because 3.13.0-21.43 revert #1236455 fix.

linux (3.13.0-21.43) trusty; urgency=low

  [ John Johansen ]

  * Revert "SAUCE: Add config option to disable new apparmor 3 semantics"
  * Revert "SAUCE: apparmor: fix uninitialized lsm_audit membe"
  * Revert "SAUCE: (no-up) apparmor: Fix tasks not subject to, reloaded
    policy"
  * Revert "SAUCE: apparmor: allocate path lookup buffers during init"
  * Revert "SAUCE: apparmor: fix unix domain sockets to be mediated on
    connection"
  * Revert "SAUCE: (no-up) apparmor: Sync to apparmor 3 - alpha 4 snapshot"
  * SAUCE: (no-up) apparmor: Sync to apparmor3 - alpha6 snapshot
    - LP: #1298611

linux (3.13.0-2.17) trusty; urgency=low

  [ John Johansen ]

  * SAUCE: (no-up) apparmor: Sync to apparmor 3 - alpha 4 snapshot
  * SAUCE: apparmor: fix unix domain sockets to be mediated on connection
    - LP: #1208988
  * SAUCE: apparmor: allocate path lookup buffers during init
    - LP: #1208988
  * SAUCE: (no-up) apparmor: Fix tasks not subject to, reloaded policy
    - LP: #1236455


I've observed a failing of AppArmor policy update with libvirt, qemu and vagrant.

vagrant ask libvirt to create vmimage backing with other qcow2 image that located in another directory.
virt-aa-helper should add it but fails.

/etc/apparmor.d/libvirt/libvirt-ef734772-4f19-4d0a-994d-a7398d178378.files:
# DO NOT EDIT THIS FILE DIRECTLY. IT IS MANAGED BY LIBVIRT.
  "/var/log/libvirt/**/libreoffice-build-ubuntu-vagrant_default_1402186805388_83426.log" w,
  "/var/lib/libvirt/**/libreoffice-build-ubuntu-vagrant_default_1402186805388_83426.monitor" rw,
  "/var/run/libvirt/**/libreoffice-build-ubuntu-vagrant_default_1402186805388_83426.pid" rwk,
  "/run/libvirt/**/libreoffice-build-ubuntu-vagrant_default_1402186805388_83426.pid" rwk,
  "/var/run/libvirt/**/*.tunnelmigrate.dest.libreoffice-build-ubuntu-vagrant_default_1402186805388_83426" rw,
  "/run/libvirt/**/*.tunnelmigrate.dest.libreoffice-build-ubuntu-vagrant_default_1402186805388_83426" rw,
  "/home/miurahr/.vagrant.d/tmp/storage-pool/box-disk1-1402186805.img" rw,
  "/home/miurahr/Projects/libreoffice/libreoffice-build-ubuntu-vagrant/**" rw,
  "/home/miurahr/Projects/libreoffice/libreoffice-build-ubuntu-vagrant/" r,

/var/log/libivrt/libvirtd.log:
Jun  8 09:26:13 tuna kernel: [33901.090187] type=1400 audit(1402187173.746:81): apparmor="DENIED" operation="open" profile="libvirt-7e96ebdc-d0cc-4c30-9112-64d5aa9955c0" name="/home/miurahr/.vagrant.d/boxes/trusty/0/kvm/box-disk1.img" pid=19976 comm="qemu-system-x86" requested_mask="r" denied_mask="r" fsuid=118 ouid=118
Jun  8 09:26:13 tuna kernel: [33901.090212] type=1400 audit(1402187173.746:82): apparmor="DENIED" operation="open" profile="libvirt-7e96ebdc-d0cc-4c30-9112-64d5aa9955c0" name="/home/miurahr/.vagrant.d/boxes/trusty/0/kvm/box-disk1.img" pid=19976 comm="qemu-system-x86" requested_mask="r" denied_mask="r" fsuid=118 ouid=118
Jun  8 09:26:13 tuna kernel: [33901.090251] type=1400 audit(1402187173.746:83): apparmor="DENIED" operation="open" profile="libvirt-7e96ebdc-d0cc-4c30-9112-64d5aa9955c0" name="/home/miurahr/.vagrant.d/boxes/trusty/0/kvm/box-disk1.img" pid=19976 comm="qemu-system-x86" requested_mask="r" denied_mask="r" fsuid=118 ouid=118


running 

sudo aa-complain /usr/lib/libvirt/virt-aa-helper

solves a problem. After running above command, I get following:

/etc/apparmor.d/libvirt/libvirt-ed29623f-5006-4b04-9d71-ac46267ef9fc.files:
# DO NOT EDIT THIS FILE DIRECTLY. IT IS MANAGED BY LIBVIRT.
  "/var/log/libvirt/**/libreoffice-build-ubuntu-vagrant_default_1402187682182_36451.log" w,
  "/var/lib/libvirt/**/libreoffice-build-ubuntu-vagrant_default_1402187682182_36451.monitor" rw,
  "/var/run/libvirt/**/libreoffice-build-ubuntu-vagrant_default_1402187682182_36451.pid" rwk,
  "/run/libvirt/**/libreoffice-build-ubuntu-vagrant_default_1402187682182_36451.pid" rwk,
  "/var/run/libvirt/**/*.tunnelmigrate.dest.libreoffice-build-ubuntu-vagrant_default_1402187682182_36451" rw,
  "/run/libvirt/**/*.tunnelmigrate.dest.libreoffice-build-ubuntu-vagrant_default_1402187682182_36451" rw,
  "/home/miurahr/.vagrant.d/tmp/storage-pool/box-disk1-1402187682.img" rw,
  "/home/miurahr/.vagrant.d/boxes/trusty/0/kvm/box-disk1.img" r,
  # don't audit writes to readonly files
  deny "/home/miurahr/.vagrant.d/boxes/trusty/0/kvm/box-disk1.img" w,
  "/home/miurahr/Projects/libreoffice/libreoffice-build-ubuntu-vagrant/**" rw,
  "/home/miurahr/Projects/libreoffice/libreoffice-build-ubuntu-vagrant/" r,

virt-aa-helper generates policy rule and reloaded properly.

The observation tell us a policy in /etc/apparmor.d/usr.lib.libvirt.virt-aa-helper:
  @{HOME}/** r,
  /**.img r,
not working and fails update libvirt policy.

This behavior is same as #1236455.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: apparmor (Ubuntu)
     Importance: Undecided
         Status: New

-- 
AppArmor Regression #1236455 by #1298611
https://bugs.launchpad.net/bugs/1327687
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