Review Request 124915: [screenlocker] Add emergency mode for greeter crashing

[David Edmundson]

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Ship it!


- David Edmundson


On Aug. 25, 2015, 10:38 a.m., Martin Gräßlin wrote:
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> https://git.reviewboard.kde.org/r/124915/
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> (Updated Aug. 25, 2015, 10:38 a.m.)
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> 
> Review request for Plasma and David Edmundson.
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> Bugs: 351696
>     https://bugs.kde.org/show_bug.cgi?id=351696
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> Repository: plasma-workspace
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> Description
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> If the greeter crashes on startup ksld is caught in a restart loop which
> causes 100 % CPU usage and makes it impossible to unlock the session.
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> With this change the greeter is only allowed to crash four times and
> ksld goes into an emergency mode. This mode ensures that our black
> background window gets shown with a message indicating how to unlock
> using loginctl. This is rather technical but better than leaving the
> system in a state which makes it impossible to unlock.
> 
> Directly unlocking in the error case is not an option as that could
> be used to attack the screen locker infrastructure.
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> BUG: 351696
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> 
> Diffs
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>   ksmserver/screenlocker/autotests/CMakeLists.txt 44bbd97add6f5c9b2f83f9f2f825fa3c904e45c5 
>   ksmserver/screenlocker/ksldapp.h 03ca2580ffc564cde033f3eeb2c81f77179a0bde 
>   ksmserver/screenlocker/ksldapp.cpp d0636b8785101cb9896cea6399952dac0e4cd227 
>   ksmserver/screenlocker/lockwindow.h 265699a9789703ad099eee043a14d4700e90c243 
>   ksmserver/screenlocker/lockwindow.cpp 41af0e23f8442d75b7295debe50d9b29fbda7e7a 
>   ksmserver/screenlocker/tests/CMakeLists.txt 613ec7b2eead38b36e7805804f25ed93b4ef7a68 
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> Diff: https://git.reviewboard.kde.org/r/124915/diff/
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> Testing
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> File Attachments
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> Emergency mode
>   https://git.reviewboard.kde.org/media/uploaded/files/2015/08/25/d90fa1f2-4400-4407-92f6-7d3dff49b3ed__screenlocker-emergency.png
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> 
> Thanks,
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> Martin Gräßlin
> 
>

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