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

[ChristianEhrhardt]

Let me outline on the /etc/qemu-ifup a bit - or at least my understanding of it.
If you happen to run "type=ethernet" networking the script gets to be important.
See https://libvirt.org/formatdomain.html#elementsNICSEthernet
In general this is not recommended for various security reasons (you have to give libvirt/qemu more permissions/capabilities to get this working).
Now if you have type=ethernet and no script set, then the default is /etc/qemu-ifup, maybe that is how it gets this "config" in your case.

The Openstack commit you referred to could absolutely be related as well.
But it should not be in your software stack in your case right?

If applied this would make the xml instead `script=""` not set anything
and yes - in that case it would then fall back to /etc/qemu-ifup which
might tickle down to showing your issue.

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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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