users July 2022

users@lists.genode.org

6 participants
3 discussions

invalid signal-context capability
by Stefan Thöni 19 Jul '22

19 Jul '22

Hello Genodians I'm debugging an "invalid signal-context capability" but I can't pinpoint the bug. From my understanding an "invalid signal-context capability" happens when the signal handler is destroyed before the signal is processed. I have therefore carefully looked at the lifetime of all signal handlers and their corresponding signals, refactoring code to allow signals to be processed before destroying signal handlers. Is there another condition that triggers an "invalid signal-context capability" besides destroying the signal handler before any corresponding signal is processed? Does anyone have any tips on how to find which signal handler caused an "invalid signal-context capability" or where the signal originated? Best regards Stefan -- Freundliche Grüsse Stefan Thöni Senior Security Architect +41 79 824 11 90 gapfruit AG Baarerstrasse 135 6300 Zug https://gapfruit.com

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Monitoring components for CPU/segmentation faults
by Duss Pirmin 18 Jul '22

18 Jul '22

Hello Genodians While searching for a solution to the problem of misbehaving components I stumbled upon `test-fault_detection` which gave me the idea to let init monitor the PD/CPU session of its children and report the error. The idea is that a monitor component can then decide what to do about the failure. I have drafted what I envision in [1]. It is not yet complete, as I'm not sure on how to safely remove the signal handlers if in a config change the monitoring is disabled. If you think this feature would be useful, I'd create an issue where the implementation details could be discussed. On the other hand maybe someone has an other idea how a similar functionality can be achieved. [1] https://github.com/trimpim/genode/tree/sandbox-fault_detection

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How to operate Genode on a machine without graphical output
by Jacek Rużyczka 12 Jul '22

12 Jul '22

Good evening, I am strongly interested to install the current Genode / SculptOS release on a server without graphical output, just with a serial terminal (VT100). As I haven't found this issue addressed in the official Genode docs, I'd like to ask here how to make Genode's UI, including the "Leitzentrale" on a 25×80 char device. Thank you. Regards Jacek Rużyczka

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users July 2022