[Bug 1326865] [NEW] libvirt cannot kill dhcp in containers

[Serge Hallyn]

Public bug reported:

If I create a ubuntu container and start it as a libvirt-lxc container,
it runs under the host dhcp profile.  Then when I try virsh -c lxc:///
destroy c1, libvirtd tries to kill dhcp in the container but fails:

Jun  5 17:54:14 t1 kernel: [ 2563.620698] type=1400 audit(1401983654.375:28): apparmor="DENIED" operation="signal" profile="/sbin/dhclient" pid=4304 comm="libvirtd" requested_mask="receive" denied_mask="receive" signal=term peer="/usr/sbin/libvirtd"
Jun  5 17:54:14 t1 kernel: [ 2563.660491] type=1400 audit(1401983654.415:29): apparmor="DENIED" operation="signal" profile="/sbin/dhclient" pid=4293 comm="libvirtd" requested_mask="receive" denied_mask="receive" signal=term peer="/usr/sbin/libvirtd"
Jun  5 17:54:14 t1 kernel: [ 2563.660600] type=1400 audit(1401983654.415:30): apparmor="DENIED" operation="signal" profile="/sbin/dhclient" pid=4293 comm="libvirtd" requested_mask="receive" denied_mask="receive" signal=term peer="/usr/sbin/libvirtd"

I don't actually understand the mechanisms here (that a profile should
be able to refuse receiving signals), and it seems like the proper fix
is to have libvirt-lxc start containers confined in a container policy,
but Jamie seemed to have another solution, which would be great.

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1326865

Title:
  libvirt cannot kill dhcp in containers

Status in “isc-dhcp” package in Ubuntu:
  New

Bug description:
  If I create a ubuntu container and start it as a libvirt-lxc
  container, it runs under the host dhcp profile.  Then when I try virsh
  -c lxc:/// destroy c1, libvirtd tries to kill dhcp in the container
  but fails:

  Jun  5 17:54:14 t1 kernel: [ 2563.620698] type=1400 audit(1401983654.375:28): apparmor="DENIED" operation="signal" profile="/sbin/dhclient" pid=4304 comm="libvirtd" requested_mask="receive" denied_mask="receive" signal=term peer="/usr/sbin/libvirtd"
  Jun  5 17:54:14 t1 kernel: [ 2563.660491] type=1400 audit(1401983654.415:29): apparmor="DENIED" operation="signal" profile="/sbin/dhclient" pid=4293 comm="libvirtd" requested_mask="receive" denied_mask="receive" signal=term peer="/usr/sbin/libvirtd"
  Jun  5 17:54:14 t1 kernel: [ 2563.660600] type=1400 audit(1401983654.415:30): apparmor="DENIED" operation="signal" profile="/sbin/dhclient" pid=4293 comm="libvirtd" requested_mask="receive" denied_mask="receive" signal=term peer="/usr/sbin/libvirtd"

  I don't actually understand the mechanisms here (that a profile should
  be able to refuse receiving signals), and it seems like the proper fix
  is to have libvirt-lxc start containers confined in a container
  policy, but Jamie seemed to have another solution, which would be
  great.

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