[Bug 1280300] Re: Desktop contents displayed on resume, before lock screen is shown

[Mathew Hodson]

** Tags added: lockscreen

** Tags added: resume suspend
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Pander]

** Tags added: 15.10
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[cuc]

happens with gnome 3.16 on ubuntu 15.10
do you need any more information? is this being worked on?
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[GrandVizier]

I did not experience it on my machine prior to 15.10, but after
upgrading to 15.10 it happens consistently every time when resuming from
suspend.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[James Baicoianu]

Still seeing this bug in Ubuntu 15.10 64-bit with Unity 3D, and have
seen it in every Ubuntu version going back to at least 2011, across
several different laptops from different manufacturers (Chromebook,
Thinkpad, and Dell something-or-other). It happens reliably every time
I resume from suspend - doesn't matter if I suspended through the menu
or by closing the lid.

How is this not considered a major security bug? If someone steals my
laptop they can see anything I was doing before suspending. Information
leakage like this should be treated as high priority.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Gatonegro]

Still seeing this bug (Ubuntu-Gnome 15.10, with Gnome 3) too.
I too think this is a security issue. They don't even need to steal my laptop -- just flip it open and power it on briefly, and be ready with a smartphone to take a picture at the screen contents.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Daniel]

I also have this issue (Ubuntu 15.10, Lenovo T450s), every time.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Lnerd]

I have this issue with both Unity and Gnome 3. Running Ubuntu 15.10 on
an Asus Zenbook UX305.

I've also been able to type briefly before it autolocks (see 830348).
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[thunder.glove]

Yes me too, Ubuntu 15.10 Unity, Toshiba Chromebook 2. I've the below as
I thought it was an issue with the screensaver after reading other
sites. No luck:


gsettings set org.gnome.desktop.screensaver ubuntu-lock-on-suspend 'true'
sudo sed -i "s/NoDisplay=true/NoDisplay=false/g" /etc/xdg/autostart/*.desktop
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Gabor]

Same here, ubuntu 15.10 unity. hp probook gd450
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[piratemurray]

Dell Inspiron 15
Ubuntu 15.10
3.6.1-7ubuntu1

Happy to troubleshoot if needed.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Kerry]

I have the same defect on HP Envy, Ubuntu 15.10
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Vincenzo Di Somma]

Same issue on Dell XPS 13 2015 (9343) Ubuntu 15.10.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Hartmut Holzgraefe]

Having this on a Dell Prestige 3510, with Ubuntu 15.10 and XFCE
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Martin Pool]

This security bug has been open for 4.5 years now.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Seth Arnold]

mbp, this looks like a 'garbage pit' style bug report; the original
complaint from two years ago is filed against gnome-screensaver but the
automatically included text reports unity was being used. Comments since
then include complaints about xfce and gnome 3 environments too.

There's no actionable information in any of this report, and furthermore
there's been half-dozen fixes to most of the screenlockers mentioned in
this report along the way because for some reason the screenlockers seem
to re-introduce the same bugs every cycle.

If you're seeing an issue, please just file a new bug. This one has
grown useless because it's not specific enough to anything to actually
fix.

Thanks

** Changed in: gnome-screensaver (Ubuntu)
Status: Confirmed => Invalid
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Vadim Andryuschenko]

seth-arnold, imho, this problem systematically reported in different
versions of Ubuntu with different desktop environments and seems like
ignored by developers. The security threat is severe and the root of the
problem lies much deeper than patching a concrete combination of
components. Confess I don't know and not going to investigate the
problem (despite that as sw developer I do want to hear about it
causes), but could you as a member of security team explain us why don't
you refactor or redesign this? And we as system users would be pleased
if some techguy investigate the problem and open a new "correct" bug
instead of switching bug to invalid state practically sinking it to the
"garbage pit".

There is no offence in my comment, but for many reasons lots of people
can't use OSes with such security holes and this is very disappointing.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Marc Deslauriers]

There is no way to fix this as long as X11 is still being used. Lock
screen timing issues are usually caused by a few different things:

1- Hardware issues. Certain models of computers have known issues where
they don't generate the proper events when the laptop lid is closed or
the suspend hotkey is pressed. In those cases, the laptop will enter the
suspend state before notifying the OS, which results in the screen not
being locked when the laptop wakes up. These issues need to be addressed
with a firmware update, or with a quirk being added to whatever platform
specific driver is in the kernel. This is the type of thing that is
tested and fixed when a laptop gets certified and preloaded with Ubuntu.

2- Actual bugs in the screen locking code. This has happened in the
past, and still occurs occasionally.

3- X11 not allowing the screen lock to forcibly remove keyboard and
mouse grabs. This is the major reason why screen locking will never work
reliably as long as we haven't switched to Wayland or Mir. For the
screen to lock, it must be able to exclusively grab the keyboard or
mouse. Unfortunately, there is no way under X11 to forcibly remove a
keyboard or mouse grab that belongs to another application. When this
happens, for example when you have a menu open, or you're using software
such as Virtalbox, the screen is unable to lock before the laptop goes
into suspend mode.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Vadim Andryuschenko]

Mark, thanks for such detailed explanation and extremely fast response!
It's grave news for me to hear that X11 is the major problem here. Would
it be better if your publish it in Ubuntu FAQ (or elsewhere) and close
all these bugs with "won't fix" to make community realize the point?
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Marc Deslauriers]

That's an excellent suggestion, I'll look into doing that. Thanks!
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Paolo Montrasio]

This bug started happening on my laptop after installing 16.04. With
12.04 there never was any problem and I never had this problem with an
older laptop, from 8.04 to 15.10.

I'm running XDG_CURRENT_DESKTOP=GNOME-Flashback:Unity

Given the suggestion at #17 I'll open a new bug for that DE. Everybody
should open a new bug for the DE you use.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Mike Jones]

Below is a workaround I use.

*********
#!/bin/sh
viewnior --fullscreen '/home/user_name/Images/My solid color image which obscures my desktop.png' && sleep 2 && dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 "org.freedesktop.login1.Manager.Suspend" boolean:true && i3lock -i '/home/user_name/Images/My image I like to look at when my computer wakes up.png' -p default -n
*********

I lock my screen with a keyboard shortcut I created in Xubuntu which I
associated with the above script.

After my computer wakes up I need to exit Viewnior (the image viewer I
am using) so that the the file called, "My solid color image which
obscures my desktop.png" disappears.

I suppose the extra step would not be necessary if someone with some
technical knowledge would explain how to cause i3lock to exit the image
viewer after the computer wakes up.

I use "viewnior --fullscreen" instead of "viewnior -f" because the later
didn't seem to work in a terminal. I suppose this was a result of my
using a French language terminal.

Also, if you need to resize your image because you want it to appear
centered on the screen, there's no need to install GIMP or any other
draw or paint application.

I used Google Drawings to resize "My solid color image which obscures my
desktop.png" to match my screen size which is 1366 x 768 pixels. I went
to File–>Page configuration–>Customize and typed 1366 then 768 and
chose pixels.

Then I downloaded "My solid color image which obscures my desktop.png"
to my local drive.

I suppose if the developer(s) of this app were to a detailed explanation
of the abovein a message, say the first five times a new image were used
in i3lock, it would help new users quickly and easily lock their screen
securely and ensure their images were centered on the screen.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Mike Jones]

The workaround below fixes a bug in the above workaround:

*********
#!/bin/sh
viewnior --fullscreen '/home/user_name/Images/My solid color image which obscures my desktop.png' &
sleep 2 &&
dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 "org.freedesktop.login1.Manager.Suspend" boolean:true && i3lock -i '/home/user_name/Images/My image I like to look at when my computer wakes up.png' -p default -n
*********
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[gethin]

Another workaround that I used for Cinnamon. I can't imagine it would be
too much trouble to adapt it to other window managers:

1. Use dconf-editor to change the button-suspend action at org>cinnamon

settings-daemon>plugins>power to 'nothing' (you could also amend lid-

close-ac-action and lid-close-battery-action as well if you're using a
laptop).

2. Save the following script to a convenient location (it locks the
screen, then suspends):

#!/bin/bash
cinnamon-screensaver-command -l
systemctl suspend

3. Use the System Settings app (cinnamon-settings) to create a custom
keybinding for the sleep key that points to the script.

After this it behaves as it should. You can see the lock screen pop up
briefly before it goes to sleep, which is reassuring.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Seth Arnold]

gethin, that seems plausibly like it could suffer from the same problems
as #49579 -- if you have a menu open or a virtualbox window to a guest
or similar, the screensaver 'lock' command may not be able to lock the
display.

That's why we recommend using the lock interface in the menus or
keyboard shortcuts, because both will either succeed easily or visibly
fail before you make the next step manually.

Thanks
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[joncamfield]

Same issue on a Lenovo t440s, Ubuntu 17.10 (Gnome shell).
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[RayfenWindspear]

Getting this as well on 16.04, but only recently. Started happening
about 4 months ago. Mine is worse because I can open it up and start
working on it. Sometimes I'll be on it for like 10 mins before it
finally shuts me out and makes me login.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions

[Paul]

I have same issue on Kubuntu 18.04 Is the NSA forcing someone to leave
this in on purpose?
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1280300

Title:
Desktop contents displayed on resume, before lock screen is shown

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions