[tor-bugs] #26202 [- Select a component]: Packaged apparmor settings break tor within LXD containers

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#26202: Packaged apparmor settings break tor within LXD containers
--------------------------------------+------------------------------
     Reporter:  b                     |      Owner:  (none)
         Type:  defect                |     Status:  new
     Priority:  Medium                |  Milestone:
    Component:  - Select a component  |    Version:  Tor: 0.3.3.6
     Severity:  Normal                |   Keywords:  lxc lxd apparmor
Actual Points:                        |  Parent ID:
       Points:                        |   Reviewer:
      Sponsor:                        |
--------------------------------------+------------------------------
 The packaged apparmor settings in the latest (0.3.3.6-1) .deb packages
 provided via torproject.org will stop the tor service from starting up in
 at least Xenial (16.04) and Bionic (18.04) containers on Ubuntu, using the
 latest LXD snap.

 The machine hosting the container will see this in its syslog/auditlog:

 `May 25 14:16:01 localhost kernel: [84735.795087] audit: type=1400
 audit(1527257761.902:653): apparmor="DENIED" operation="file_mmap"
 namespace="root//lxd-juju-ef908d-1_<var-snap-lxd-common-lxd>"
 profile="system_tor" name="/usr/bin/tor" pid=18256 comm="tor"
 requested_mask="m" denied_mask="m" fsuid=1000000 ouid=1000000`

 The fix is a simple one-character change in the
 `/etc/apparmor.d/abstractions/tor` file installed by the tor package,
 where the line `/usr/bin/tor r,` simply needs to change to `/usr/bin/tor
 mr,`.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26202>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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