[GH-ISSUE #873] Use of systemcalls #589

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opened 2026-05-05 06:14:13 -06:00 by gitea-mirror · 1 comment

gitea-mirror commented

2026-05-05 06:14:13 -06:00

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Originally created by @valoq on GitHub (Oct 26, 2016).
Original GitHub issue: https://github.com/netblue30/firejail/issues/873

Analysing the systemcalls of mupdf and writing code which applies those syscalls with seccomp filter (using libseccomp) and the executing mupdf, I got a working application with only very few allowed syscalls.
However simply applying thoses syscalls to firejail with seccomp.keep does not work and it turns out that with firejail, mupdf needs a lot more syscalls. Why is that?

Originally created by @valoq on GitHub (Oct 26, 2016). Original GitHub issue: https://github.com/netblue30/firejail/issues/873 Analysing the systemcalls of mupdf and writing code which applies those syscalls with seccomp filter (using libseccomp) and the executing mupdf, I got a working application with only very few allowed syscalls. However simply applying thoses syscalls to firejail with seccomp.keep does not work and it turns out that with firejail, mupdf needs a lot more syscalls. Why is that?

gitea-mirror

2026-05-05 06:14:13 -06:00

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gitea-mirror commented

2026-05-05 06:14:18 -06:00

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@netblue30 commented on GitHub (Oct 27, 2016):

After the filter is enabled, the sandbox still makes a small number of syscalls in order to configure and monitor the program running in the sandbox.

@netblue30 commented on GitHub (Oct 27, 2016): After the filter is enabled, the sandbox still makes a small number of syscalls in order to configure and monitor the program running in the sandbox.

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Reference: github-starred/firejail#589

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