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[Launchpad Bug Tracker <1410582@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unity - 7.2.4+14.04.20150316-0ubuntu1

---------------
unity (7.2.4+14.04.20150316-0ubuntu1) trusty; urgency=medium

  [ Andrea Azzarone ]
  * Avoid running potentially dangerous code paths when the screen is
    locked. (LP: #1410582)
  * Ungrab the shoutdown dialog as soon as possible. (LP: #1398287)
  * Use COMPIZ_METAKEY where needed. (LP: #1363534)
  * disabled Pointer Barriers during lockscreen (LP: #1401911)
  * disabled markup for VolumeLauncherIcon quicklist menu items (LP:
    #1413411)
  * enable Dash, Hud, and session dialogs over full screen window (LP:
    #1159249, #860970, #1413773, #1404486)
  * made unity unlockable if user is in nopsswdlogin group (LP:
    #1413790)
  * skipped the animation of BGHash on startup to prevent unwanted fade-
    in (LP: #1241757)

  [ Luke Yelavich ]
  * extended accessible exploration of the Dash dynamic content (LP:
    #1066157)

  [ Marco Trevisan (Treviño) ]
  * MenuManager: make sure menus are always shown when mouse is over
    them or when the always-show-menus option is on (LP: #955193,
    #1390562, #1374942, #1312137)
  * PanelService: use gdbus to notfy upstart of service start/stop (LP:
    #1302955)
 -- CI Train Bot <ci-train-bot@xxxxxxxxxxxxx>   Mon, 16 Mar 2015 17:30:35 +0000

** Changed in: unity (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1410582

Title:
  [Trusty / Unity] Desktop got unlocked on its own.

Status in Unity:
  Fix Released
Status in Unity 7.2 series:
  In Progress
Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Trusty:
  Fix Released

Bug description:
  [Impact]

  Certain code paths may cause the Unity lockscreen to crash, which can
  allow the screen to be unlocked without a password entry.

  [Test Case]

  Unfortunately this bug only appears under certain race conditions and
  is not reliably reproduce able.

  [Regression Potential]

  The change in the code simply assumes that if a screen is already
  locked, then it is lockable this avoiding certain operations that are
  inherently racy.  It is possible that this fix does not avoid all
  possible crash conditions in the lockscreen and there may still be
  unaccounted-for crashes in the lockscreen.

  [Other Info]

  This fix was cherry picked for Ubuntu 14.04 LTS from the Ubuntu "Vivid
  Vervet" dev release where it has been in testing for some time.

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