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Old 05-25-2010, 07:30 PM   #1
guanx
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Screen saver security in KDE 4.4.3


In KDE @ Slackware 13.1, turn on composite, and lock the screen. Then move the mouse. For > 3/4 of the time I can see the screen saver suddenly disappeared and my desktop showed up for about 0.1s, then the screen saver came back and asked for password.

This problem can enable unauthorized people to peek into a locked screen. I don't know if this is because of my poor laptop with Intel integrated graphics. Can anyone reproduce it?
 
Old 05-26-2010, 04:10 AM   #2
brixtoncalling
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I have a fairly poor laptop + Intel card but I do not experience it, though I do recall some flicker this when resuming from suspend. You could try using xscreensaver directly (not going through KDE's screensaver system).
 
Old 05-27-2010, 02:36 AM   #3
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Quote:
Originally Posted by brixtoncalling View Post
I have a fairly poor laptop + Intel card but I do not experience it, though I do recall some flicker this when resuming from suspend. ...
I think it's more pronounced under heavy load or for quick-eyed users.

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Originally Posted by brixtoncalling View Post
... You could try using xscreensaver directly (not going through KDE's screensaver system).
Thanks. I just intended to inform others of this risk. It can be easily avoided by switching to an empty workspace before locking the screen.
 
Old 05-27-2010, 04:45 AM   #4
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Actually, on a related note, on 13.1 (not 13.0 though), when I resume from suspend, I get a few seconds to look at tty6. Obviously this isn't much of security risk because anyone at the compute can switch there themselves anytime they like.
 
Old 05-27-2010, 06:02 AM   #5
sjampoo
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Bwaohaha.. are you sure you are not using Winblows? I have got the exact same 'problem' on about all machines @ work: Inbetween the disappearance of the screensaver and the un-lock box, I get a very short sneek peek at what the user was doing when he/she walked off. Just about enough time to see what kind-o-program it is. (Word/Excel or the gossip pages on some internet-time-to-burn-money-to-waste-newssite )
 
Old 05-27-2010, 07:00 AM   #6
guanx
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Quote:
Originally Posted by sjampoo View Post
Bwaohaha.. are you sure you are not using Winblows? I have got the exact same 'problem' on about all machines @ work: Inbetween the disappearance of the screensaver and the un-lock box, I get a very short sneek peek at what the user was doing when he/she walked off. Just about enough time to see what kind-o-program it is. (Word/Excel or the gossip pages on some internet-time-to-burn-money-to-waste-newssite )
We made another step towards the user experience of Windows. I fear that there are Ubuntu developers mixed up into the KDE team because porting Windows'es bugs to Linux is Ubuntu developers' main job.
 
Old 05-27-2010, 07:06 AM   #7
brixtoncalling
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Quote:
Originally Posted by sjampoo View Post
Bwaohaha.. are you sure you are not using Winblows? I have got the exact same 'problem' on about all machines @ work
Hello, please tell me how I can be exactly sure that I am not in fact using Windows?

Thank you, Mr B. Calling, Esq.
 
Old 11-19-2013, 09:41 AM   #8
guanx
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Bug still there in Slackware 14.1

Quote:
Originally Posted by brixtoncalling View Post
Actually, on a related note, on 13.1 (not 13.0 though), when I resume from suspend, I get a few seconds to look at tty6. Obviously this isn't much of security risk because anyone at the compute can switch there themselves anytime they like.
With Slackware 14.1 when resume from suspend, I get (at 20%~50% chance) the KDE desktop for more than 0.1s, enough to see the screenbefore suspend. Then the KDE desktop gets locked.
 
Old 11-19-2013, 12:14 PM   #9
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I'm using Xfce (4.10) on Slackware 14.0. I boot into runlevel 3 and then use startx but when I suspend and it does give away the desktop on resume for half a sec before it asks for password. Also, when I suspend and if I immediately resume, it doesn't ask for a password at all although 'Lock Screen' always ask for password. I'm using xscreensaver. I haven't tried to investigate the problem since I'm lazy . But I'm interested in finding out what causes such behaviour.
 
  


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