Bug 373235 - Screen locking doesn't work in desktop grid
Summary: Screen locking doesn't work in desktop grid
Status: RESOLVED DUPLICATE of bug 78871
Alias: None
Product: kwin
Classification: Plasma
Component: effects-desktop-grid (show other bugs)
Version: 5.8.4
Platform: Other Linux
: NOR major
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-12-04 00:40 UTC by i9i7
Modified: 2016-12-04 20:00 UTC (History)
0 users

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:
mgraesslin: X11+


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Description i9i7 2016-12-04 00:40:05 UTC
Big security problem. All forms of screen locking are disabled by the Desktop Grid. Automatic locking doesn't work, and Super+L doesn't work.
Comment 1 Martin Flöser 2016-12-04 08:07:10 UTC
This is a well known limitation of X11 - see for example my blog post on the topic: https://blog.martin-graesslin.com/blog/2015/01/why-screen-lockers-on-x11-cannot-be-secure/

On Wayland the problem is fixed on X11 it's impossible to fix.
Comment 2 Martin Flöser 2016-12-04 08:07:36 UTC

*** This bug has been marked as a duplicate of bug 78871 ***
Comment 3 i9i7 2016-12-04 18:27:36 UTC
(In reply to Martin Gräßlin from comment #1)
> This is a well known limitation of X11 - see for example my blog post on the
> topic:
> https://blog.martin-graesslin.com/blog/2015/01/why-screen-lockers-on-x11-
> cannot-be-secure/
> 
> On Wayland the problem is fixed on X11 it's impossible to fix.

Okay, though I guess I have to ask why the menus and overview mode in GNOME3 don't prevent screen locking.
Comment 4 Martin Flöser 2016-12-04 20:00:34 UTC
Am 4. Dezember 2016 19:27:36 MEZ, schrieb i9i7 <bugzilla_noreply@kde.org>:
>https://bugs.kde.org/show_bug.cgi?id=373235
>
>--- Comment #3 from i9i7 <i9i7soft@gmail.com> ---
>(In reply to Martin Gräßlin from comment #1)
>> This is a well known limitation of X11 - see for example my blog post
>on the
>> topic:
>>
>https://blog.martin-graesslin.com/blog/2015/01/why-screen-lockers-on-x11-
>> cannot-be-secure/
>> 
>> On Wayland the problem is fixed on X11 it's impossible to fix.
>
>Okay, though I guess I have to ask why the menus and overview mode in
>GNOME3
>don't prevent screen locking.

Gnome is gnome, KWin is KWin. It's pretty useless to say that this works in gnome. It cannot with our implementation.