[Bug 1665698] Re: /etc/qemu-ifup not allowed by apparmor

[Logan V]

I must've done something wrong when originally testing the abstraction
fix. I re-tested based on your advice and it does indeed fix the
problem. The abstraction file that I just tested, which worked, is
http://cdn.pasteraw.com/9u16uk9938mp5t3x530ok0w791nkooc.

Regarding upstream vs. packaged, I went into some detail on that in #18,
but basically it is upstream Openstack sourced from git, with libvirt
and non-openstack bits sourced from cloud-archive.

Also yes I can confirm that reverting nova to the empty string behavior results in a working system:
    <interface type='ethernet'>
      <mac address='fa:16:3e:23:fe:4d'/>
      <script path=''/>
      <target dev='tap7f277872-98'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>

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https://bugs.launchpad.net/bugs/1665698

Title:
  /etc/qemu-ifup not allowed by apparmor

Status in Ubuntu Cloud Archive:
  Incomplete
Status in libvirt package in Ubuntu:
  Incomplete

Bug description:
  I have VMs failing to start with 2017-02-17 15:38:44.458 264015 ERROR
  nova.compute.manager [instance: 0c97ab16-2d30-43fa-b0e4-a064a842b5ed]
  libvirtError: internal error: process exited while connecting to
  monitor: 2017-02-17T15:38:43.907222Z qemu-system-x86_64: -netdev
  tap,ifname=tapf34ef99e-18,id=hostnet0,vhost=on,vhostfd=28: network
  script /etc/qemu-ifup failed with status 256

  Log excerpt:
  http://cdn.pasteraw.com/b3tw4cjefomfi3e9k09hvodrfun85z

  Seems to be that /etc/qemu-ifup is being blocked by apparmor:
  type=AVC msg=audit(1487347189.015:28536): apparmor="DENIED" operation="exec" profile="libvirt-4a03fea7-e966-48e4-80ac-aa138db67243" name="/etc/qemu-ifup" pid=285438 comm="qemu-system-x86" requested_mask="x" denied_mask="x" fsuid=0 ouid=0
  type=PATH msg=audit(1487347189.015:28536): item=0 name="/etc/qemu-ifup" inode=66403 dev=08:01 mode=0100755 ouid=0 ogid=0 rdev=00:00 nametype=NORMAL

  root at ubuntu-trusty-5773:/etc/apparmor.d/abstractions# cat /etc/apparmor.d/libvirt/libvirt-4a03fea7-e966-48e4-80ac-aa138db67243
  #
  # This profile is for the domain whose UUID matches this file.
  #

  #include <tunables/global>

  profile libvirt-4a03fea7-e966-48e4-80ac-aa138db67243 {
    #include <abstractions/libvirt-qemu>
    #include <libvirt/libvirt-4a03fea7-e966-48e4-80ac-aa138db67243.files>

  }
  root at ubuntu-trusty-5773:/etc/apparmor.d/abstractions# cat /etc/apparmor.d/libvirt/libvirt-4a03fea7-e966-48e4-80ac-aa138db67243.files
  # DO NOT EDIT THIS FILE DIRECTLY. IT IS MANAGED BY LIBVIRT.
    "/var/log/libvirt/**/instance-00000008.log" w,
    "/var/lib/libvirt/qemu/domain-instance-00000008/monitor.sock" rw,
    "/var/run/libvirt/**/instance-00000008.pid" rwk,
    "/run/libvirt/**/instance-00000008.pid" rwk,
    "/var/run/libvirt/**/*.tunnelmigrate.dest.instance-00000008" rw,
    "/run/libvirt/**/*.tunnelmigrate.dest.instance-00000008" rw,
    "/var/lib/nova/instances/4a03fea7-e966-48e4-80ac-aa138db67243/console.log" rw,
    "/var/lib/nova/instances/4a03fea7-e966-48e4-80ac-aa138db67243/console.log" rw,
    # for qemu guest agent channel
    owner "/var/lib/libvirt/qemu/channel/target/domain-instance-00000008/**" rw,
    /dev/vhost-net rw,

  root at ubuntu-trusty-5773:/etc/apparmor.d/abstractions# dpkg -S libvirt-qemu
  libvirt-bin: /etc/apparmor.d/abstractions/libvirt-qemu

  root at ubuntu-trusty-5773:/etc/apparmor.d/abstractions# dpkg -l libvirt-bin
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                                      Version                   Architecture              Description
  +++-=========================================-=========================-=========================-=======================================================================================
  ii  libvirt-bin                               1.3.1-1ubuntu10.6~cloud0  amd64                     programs for the libvirt library

  
  Seeing identical behavior on Xenial
  ubuntu at ubuntu-xenial-5165:~$ dpkg -l libvirt-bin
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                                      Version                   Architecture              Description
  +++-=========================================-=========================-=========================-=======================================================================================
  ii  libvirt-bin                               1.3.1-1ubuntu10.8         amd64                     programs for the libvirt library

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