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[Launchpad Bug Tracker <1628285@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package apparmor - 2.10.95-0ubuntu2.5

---------------
apparmor (2.10.95-0ubuntu2.5) xenial; urgency=medium

  * debian/lib/apparmor/functions, debian/apparmor.init,
    debian/apparmor.service, debian/apparmor.upstart,
    debian/lib/apparmor/profile-load: Adjust the checks that previously kept
    AppArmor policy from being loaded while booting a container. Now we
    attempt to load policy if we're in a LXD or LXC managed container that is
    using profile stacking inside of a policy namespace. (LP: #1628285)
  * Fix regression tests for stacking so that the kernel SRU process is not
    interrupted by failing tests whenever the AppArmor stacking features are
    backported from the 16.10 kernel or when the 16.04 LTS Enablement Stack
    receives a 4.8 or newer kernel
    - debian/patches/r3509-tests-fix-exec_stack-errors-1.patch: Fix the
      exec_stack.sh test when running on 4.8 or newer kernels (LP: #1628745)
    - debian/patches/r3558-tests-fix-exec_stack-errors-2.patch: Adjust the
      exec_stack.sh fix mentioned above to more accurately test kernels older
      than 4.8 (LP: #1630069)
    - debian/patches/allow-stacking-tests-to-use-system.patch: Apply this
      patch earlier in the series, as to match when it was committed upstream,
      so that the above two patches can be cherry-picked from lp:apparmor

 -- Tyler Hicks <tyhicks@xxxxxxxxxxxxx>  Fri, 07 Oct 2016 05:21:44 +0000

** Changed in: apparmor (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1628285

Title:
  apparmor should be allowed to start in containers

Status in apparmor package in Ubuntu:
  Fix Released
Status in apparmor source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  The kernel in xenial-proposed (4.4.0-46.67) and the lxd that has recently migrated from xenial-proposed (2.0.5-0ubuntu1~ubuntu16.04.1) allows us to enable stacked/namespaced AppArmor policy for lxd containers. This means that the container can have an overall confinement profile while still allowing individual processes inside of the container to have individual confinement profiles. This bug is for the apparmor userspace changes needed to allow the container init to load apparmor profiles during the container boot procedure.

  [Test Case]
  Install the kernel from xenial-proposed (4.4.0-46.67). Reboot into the new kernel and set up a new xenial lxd container (MUST be an unprivileged container):

   $ lxc start ubuntu:16.04 x

  Install apparmor from xenial-proposed (2.10.95-0ubuntu2.5) inside of
  the container and reboot the container.

  Verify that the container's dhclient is confined inside of an AppArmor
  namespace with a stacked profile that was loaded inside of the
  container:

  $ ps auxZ | grep '^lxd-x_</var/lib/lxd>//&:lxd-x_<var-lib-lxd>:///sbin/dhclient'
  lxd-x_</var/lib/lxd>//&:lxd-x_<var-lib-lxd>:///sbin/dhclient (enforce) 165536 3889 0.0  0.0 16120 860 ? Ss 03:55   0:00 /sbin/dhclient -1 -v -pf /run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases -I -df /var/lib/dhcp/dhclient6.eth0.leases eth0

  [Regression Potential]
  The regression potential is relatively high because processes inside of Ubuntu containers can be confined with an additional profile that is loaded inside of the container. However, this feature was released in Ubuntu 16.10 with no known issues so far.

  [Original Description]

  Now that we have support for apparmor namespacing and stacking,
  unprivileged containers can and should be allowed to load apparmor
  profiles.

  The following changes are needed at least:
   - Change the systemd unit to remove the "!container" condition
   - Change the apparmor init script, replacing the current simple container check for something along the lines of:
      - If /proc/self/attr/current says "unconfined"
      - And /sys/kernel/security/apparmor/features/domain/stack contains "yes"
      - And /sys/kernel/security/apparmor/features/domain/version is 1.2 or higher
      - Then continue execing the script, otherwise exit 0

  John suggested he could add a file which would provide a more reliable
  way to do this check ^

  In either case, we need this change so that containers can behave more
  like normal systems as far as apparmor is concerned. That change
  should also be SRUed back to Xenial at the same time the kernel
  support for stacking is pushed.

  This bug is effectively a blocker for snapd inside LXD as without
  this, snap-confine and snapd itself will not be confined after
  container restart.

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