[Pkg-libvirt-maintainers] Bug#876071: libvirt-daemon-system: Mount namespace and AppArmor confinement are incompatible => breaks networking

[intrigeri at debian.org]

Package: libvirt-daemon-system
Version: 3.7.0-2
Severity: normal

Hi,

since some fairly recent sid upgrade, my VMs don't get network
anymore and my logs contain lots of:

  kernel: audit: type=1400 audit(1505719435.761:27425226): apparmor="DENIED" operation="file_perm" info="Failed name lookup - disconnected path" error=-13 profile="libvirt-213ff882-ce4b-035d-e2b1-9059d66cd67d" name="dev/net/tun" pid=25947 comm="qemu-system-x86" requested_mask="r" denied_mask="r" fsuid=119 ouid=0

I've tried passing flags=(attach_disconnected) in
/etc/apparmor.d/libvirt/TEMPLATE.qemu but that did not fix the bug for
some reason, so I've reverted this change.

My current workaround is to disable private mount namespaces in
/etc/libvirt/qemu.conf:

  namespaces = [ ]

FWIW the network these VMs are connected to looks like:

<network connections='1'>
  <name>routed</name>
  <uuid>054fadcc-23da-4014-94e7-cdde77924045</uuid>
  <forward mode='route'/>
  <bridge name='vmz0' stp='on' delay='0'/>
[…]
</network>

Cheers!

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (500, 'stable-updates'), (500, 'oldstable-updates'), (500, 'testing'), (500, 'stable'), (500, 'oldstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.12.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libvirt-daemon-system depends on:
ii  adduser              3.116
ii  debconf              1.5.63
ii  gettext-base         0.19.8.1-4
ii  init-system-helpers  1.49
ii  iptables             1.6.1-2
ii  libacl1              2.2.52-3+b1
ii  libapparmor1         2.11.0-10
ii  libaudit1            1:2.7.7-1+b2
ii  libblkid1            2.29.2-5
ii  libc6                2.24-17
ii  libcap-ng0           0.7.7-3+b1
ii  libdbus-1-3          1.11.16+really1.10.22-1
ii  libdevmapper1.02.1   2:1.02.142-1
ii  libnl-3-200          3.2.27-2
ii  libnl-route-3-200    3.2.27-2
ii  libnuma1             2.0.11-2.1
ii  libselinux1          2.7-2
ii  libvirt-clients      3.7.0-2
ii  libvirt-daemon       3.7.0-2
ii  libvirt0             3.7.0-2
ii  libxml2              2.9.4+dfsg1-4
ii  libyajl2             2.1.0-2+b3
ii  logrotate            3.11.0-0.1
ii  lsb-base             9.20170808
ii  policykit-1          0.105-18

Versions of packages libvirt-daemon-system recommends:
ii  bridge-utils  1.5-14
ii  dmidecode     3.1-1
ii  dnsmasq-base  2.77-2
ii  ebtables      2.0.10.4-3.5+b1
ii  iproute2      4.9.0-2
ii  parted        3.2-17

Versions of packages libvirt-daemon-system suggests:
ii  apparmor    2.11.0-10
pn  auditd      <none>
ii  nfs-common  1:1.3.4-2.1+b1
ii  pm-utils    1.4.1-17
ii  radvd       1:2.16-3
ii  systemd     234-3
pn  systemtap   <none>
pn  zfsutils    <none>

-- debconf information:
  libvirt-daemon-system/id_warning: true

-- 
intrigeri