[Bug 72979] New: garbage / parts of previous session displayed on login screen after reboot

[Bug 72979] New: garbage / parts of previous session displayed on login screen after reboot

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=72979

          Priority: medium
            Bug ID: 72979
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
           Summary: garbage / parts of previous session displayed on login
                    screen after reboot
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org
          Severity: critical
    Classification: Unclassified
                OS: All
          Reporter: vincent-fdt-buymaDBGzMOsTnJN9+BGXg@public.gmane.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

After rebooting a machine using the lightdm display manager, garbage / parts of
the user's previous session are displayed on the login screen, which is an
important security problem, as anyone with physical access to the keyboard and
screen of the machine can reboot it (no need to have an account for that). See
Debian bugs:
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=700235
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=732854

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[Bug 72979] garbage / parts of previous session displayed on login screen after logout or reboot

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=72979

Vincent Lefevre <vincent-fdt-buymaDBGzMOsTnJN9+BGXg@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|garbage / parts of previous |garbage / parts of previous
                   |session displayed on login  |session displayed on login
                   |screen after reboot         |screen after logout or
                   |                            |reboot

--- Comment #1 from Vincent Lefevre <vincent-fdt-buymaDBGzMOsTnJN9+BGXg@public.gmane.org> ---
The problem can also occur after logging out. And parts of the user's previous
session can appear on the whole background screen. That's a lot of data!

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[Bug 72979] garbage / parts of previous session displayed on login screen after logout or reboot

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https://bugs.freedesktop.org/show_bug.cgi?id=72979

--- Comment #2 from Vincent Lefevre <vincent-fdt-buymaDBGzMOsTnJN9+BGXg@public.gmane.org> ---
Corrupt background also occurs after a cold boot (i.e. from power off), but in
this case, there is no security problem of course: I just get a blank
background, possibly with random black points.

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[Bug 72979] garbage / parts of previous session displayed on login screen after logout or reboot

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https://bugs.freedesktop.org/show_bug.cgi?id=72979

--- Comment #3 from Vincent Lefevre <vincent-fdt-buymaDBGzMOsTnJN9+BGXg@public.gmane.org> ---
After the latest Debian/unstable upgrade and reboot, in particular with the
xserver-xorg-video-nouveau package upgraded from 1:1.0.10-1+b2 to 1:1.0.11-1,
it seems that I can no longer reproduce this problem. I've tried several times
after logging out, and only once after the reboot due to the upgrade.

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[Bug 72979] garbage / parts of previous session displayed on login screen after logout or reboot

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https://bugs.freedesktop.org/show_bug.cgi?id=72979

Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #4 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/81.

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