Security Audit Request for Screenlocker Branch

Martin Gräßlin mgraesslin at
Sun Oct 9 19:02:27 BST 2011

Hi all,

as you might know we have been working on moving the screenlocker from KRunner 
to KWin and passed the control to the compositor (iff compositing is active) 
to ensure that nothing which should not be shown gets visible.

I want to request a security audit for the changes to ensure that the new 
implementation is as secure as the existing one and that I did not forget an 
important case which would compromise the security.

The general concept of the new screenlocker is described in the wiki:

The documentation of the implementation can be found in:

The code lives in the farhad_hf/lockscreen branch in kde-workspace git 
repository. The main new files can be found in 
and in kwin/effects/screenlocker/*

The authentication architecture is not changed and the code under 
effects/screenlocker/ is just c&p from the existing implementation. It is 
planned to drop the existing implementation around kscreenlocker in 4.9 
completely in favor of the new implementation also in the non-composited case. 
Because of that I decided to c&p and not adjust the existing code to suit both 

Currently known limitations of the new implementation:
* KNotification not working (needs to be merged with KWin's knotifyrc)
* Screenlocker not able to adjust to multi screen changes while screen is 
locked. This needs some already planned rework in the compositor.

Happy hacking

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