update 20/01/2012 18:45 CET: Peter Hutterer, an X.org developer, posted an interesting article about this.

Hi, I recently stumbled upon a funny bug^Wfeature in the Xorg server that could allow attackers with physical access to a machine to bypass the screensaver/screen locker program. Most people use those programs to lock their computer when they are away. On Gnome, gnome-screensaver is responsible for this. On KDE, kscreenlocker is. There is a wide variety of smaller tools doing the same thing, e.g. slock, slimlock, i3lock...

All these tools work more or less the same way ...

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