desktop-packages team mailing list archive

[Mathew Hodson <mathew.hodson@xxxxxxxxx>]

lightdm is available in the trusty-proposed repository and at
https://launchpad.net/ubuntu/+source/lightdm/1.10.3-0ubuntu2 .

Please help us by testing this new package. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed. In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1364725

Title:
  logind session ID not used due to race condition

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.10 series:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Trusty:
  Fix Committed
Status in lightdm source package in Utopic:
  Fix Released

Bug description:
  [Impact]
  Sometimes a session will fail to get the logind session ID to pass back to the LightDM daemon. This appears to be due to a race using the D-Bus method org.freedesktop.login1.Manager.GetSessionByPID instead of getting the environment variable XDG_SESSION_ID as set in PAM.

  This bug was detected by a bug in LightDM 1.11.7 where the daemon
  would attempt to read both a logind and ConsoleKit ID when this D-Bus
  call failed.

  The solution is to use the XDG_SESSION_ID environment variable and not
  GetSessionByPID() and to fix the passing of the session id(s) from the
  session to the daemon to be unambiguous.

  [Test Case]
  Check the LightDM log always contains lines like:
  [+0.78s] DEBUG: Activating login1 session c1
  for each session.

  [Regression Potential]
  Change is non-trivial and could cause other bugs. Regression tests confirm existing test cases work.

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