[regression] lock screen bypass with touchpad

I'm having trouble downloading this video, could you, to make triagers' lives easier, textually describe the actions the video's author takes?

hexafraction, sure; he locks the screen using the gear -> lock menu; he waits until the password prompt is visible; he uses three or four fingers on the touchpad to bring up something very similar to alt-tab or alt+` display of running windows.

I can at least partially confirm this using my Apple Magic Trackpad. Using a 3 finger tap followed by a 3 finger hold, I get the window switcher to appear on top of the lock screen. I can then drag my fingers to cycle through the windows but I haven't yet been able to get any windows to appear on top of the lock screen

@Crish can you try to linked branch? Ubuntu does not support my multitouch device so I'm not able to reproduce the bug. Please tell me if you need a PPA.

This bug was fixed in the package unity - 7.2.0+14.10.20140607-0ubuntu1

---------------
unity (7.2.0+14.10.20140607-0ubuntu1) utopic; urgency=low

  [ Chris Townsend ]
  * Fix issue where the number of Launcher icon pips are not always
    properly updated when a new window of an already running application
    is opened. (LP: #1283775)
  * Fix issue where the Panel shadow would get drawn over drop down
    windows in full screen windows. (LP: #1316005)

  [ Andrea Azzarone ]
  * Clear the clipboard when locking the screen. (LP: #1308911)
  * Disable switcher gestures if screen is locked. Fixed a regression.
    (LP: #1321043)
  * Pass the correct options to showLauncherKeyTerminate in
    UnityScreen::OnLockScreen (LP: #1320438)
  * Fix skype indicator blinking. (LP: #1310200)

  [ Marco Trevisan (Treviño) ]
  * PluginAdapter: try to grab the screen to make sure that the screen
    is not grabbed FocusIn event with NotifyGrab mode is not always
    triggered by X when a window takes the grab, then we need to ensure
    that there's no grab by trying to get one. We only care about
    keyboard here, since pointer grabs don't affect us in general. (LP:
    #741869)
  * ShortcutView: use RawPixel's for the size values and convert them to
    match current scaling Plus dinamically allocate horizontal space,
    not to cut the text. (LP: #924840)
 -- Ubuntu daily release <email address hidden> Sat, 07 Jun 2014 16:27:46 +0000

Hello Seth, or anyone else affected,

Accepted unity into trusty-proposed. The package will build now and be available at http://launchpad.net/ubuntu/+source/unity/7.2.2+14.04.20140714-0ubuntu1 in a few hours, and then in the -proposed repository.

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!

Marco, Andrea, I don't have a gesture-capable touchpad and can't test this SRU myself.

Thanks

This bug was fixed in the package unity - 7.2.2+14.04.20140714-0ubuntu1

---------------
unity (7.2.2+14.04.20140714-0ubuntu1) trusty; urgency=medium

  [ Alfred Neumayer ]
  * Restore the launcher position by reversing the animation and
    unsetting the DND_PUSHED_OFF quirk. (LP: #1304882)

  [ Brandon Schaefer ]
  * TextInput: move the warning icon inside the input field, render it
    white (LP: #1307738)
  * ShutdownView: Scale up the Buttons and Text plus Borders of the
    UnityWindowView. (LP: #1308323)
  * Lockscreen warning icon needs a tooltip to say what the warning is
    about! (LP: #1308288)

  [ Marco Trevisan (Treviño) ]
  * UnityScreen: always paint the lockscreen above, just add menu and
    onboard as exceptions Some code cleanup, factorizing similar code.
    (LP: #1313280)
  * ApplicationLauncherIcon: Focus and, in case, Spread the windows on
    DnD After 1 second that an user is over an icon, that icon should
    focus the relative application and Spread its windows if it has more
    than one opened. Correctly handle the DnD scale in launcher, and
    apply glow to the icon under pointer. (LP: #607796)
  * ShutdownView: Scale up the Buttons and Text plus Borders of the
    UnityWindowView. (LP: #1308323)
  * SwitcherView: use RawPixel's for the size values and convert them to
    match current scaling (LP: #1317348)
  * PluginAdapter: try to grab the screen to make sure that the screen
    is not grabbed FocusIn event with NotifyGrab mode is not always
    triggered by X when a window takes the grab, then we need to ensure
    that there's no grab by trying to get one. We only care about
    keyboard here, since pointer grabs don't affect us in general.
    (LP: #741869)
  * ShortcutView: use RawPixel's for the size values and convert them to
    match current scaling Plus dinamically allocate horizontal space,
    not to cut the text. (LP: #924840)

  [ Chris Townsend ]
  * Fix issue where scaling the edge illumination up and down with the
    size of the Launcher icons would cause the illumination border to be
    offset and smaller than the icon. (LP: #1309739)
  * Fix issue where the number of Launcher icon pips are not always
    properly updated when a new window of an already running application
    is opened. (LP: #1283775)
  * Fix issue where the Panel shadow would get drawn over drop down
    windows in full screen windows. (LP: #1316005)
  * Bump upstream release to 7.2.2.

  [ Andrea Azzarone ]
  * Clear the clipboard when locking the screen. (LP: #1308911)
  * Disable switcher gestures if screen is locked. Fixed a regression.
    (LP: #1321043)
  * Pass the correct options to showLauncherKeyTerminate in
    UnityScreen::OnLockScreen (LP: #1320438)
  * Fix skype indicator blinking. (LP: #1310200)
  * Add a warning in the session dialog if other sessions are still
    open. (LP: #1281058)

  [ Ubuntu daily release ]
  * New rebuild forced
 -- Ubuntu daily release <email address hidden> Mon, 14 Jul 2014 14:31:00 +0000

The Unity 7.2.2+14.04.20140714-0ubuntu1 is perfect! Thank you!