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[Launchpad Bug Tracker <1339727@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/trusty-proposed/apparmor

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https://bugs.launchpad.net/bugs/1339727

Title:
  lightdm xauthority path is wrong

Status in apparmor package in Ubuntu:
  Fix Released
Status in apparmor source package in Trusty:
  Triaged
Status in apparmor source package in Utopic:
  Fix Released

Bug description:
  [impact]

  This issue prevents X applications from working properly when lightdm is
  used as a display manager.

  [steps to reproduce]

  1) run evince in a desktop session started from lightdm. If this bug
  has not been addressed, apparmor denials will be seen on the
  /run/lightdm/$USER/xauthority file in /var/log/syslog.

  [regression potential]

  The change in the patch for this bug is a slight loosening of
  the apparmor policy for X applications. The risk of an introduced
  regression is small.

  [original description]

  The default apparmor 'X' abstraction permits access to
  /{,var/}run/lightdm/authority/[0-9]*, ostensibly for the xauthority
  file.  Except on Trusty, that's not where the xauthority file is.  It
  is instead in /run/lightdm/$USER, and named "xauthority".   I have had
  to udpated my apparmor configuration, lest apparmor convince Evince of
  being a filthy script kiddie, out to corrupt my xauth file.

  Please consider adding the following to the 'X' abstraction:

  owner /{,var/}run/lightdm/*/xauthority r,

  Relevant info:

  apparmor:
    Installed: 2.8.95~2430-0ubuntu5
    Candidate: 2.8.95~2430-0ubuntu5
    Version table:
   *** 2.8.95~2430-0ubuntu5 0
          500 http://mirrors.mit.edu/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

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