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[GH-ISSUE #375] Arch Linux: firejail --x11 kills X server on exit #270

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opened 2026-05-05 05:28:26 -06:00 by gitea-mirror · 4 comments

gitea-mirror commented

2026-05-05 05:28:26 -06:00

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Originally created by @fd0 on GitHub (Mar 22, 2016).
Original GitHub issue: https://github.com/netblue30/firejail/issues/375

Hi, thanks for writing firejail!

When using --x11 to start a separate X server for a program, exiting the program also kills the normal X server so my session is terminated. This seems to be a bug.

I can reproduce this on Archlinux with firejail compiled from git (r712.431d39d-1) and xpra-winswitch version 0.16.2-1.

Is there anything I can do to help solving this bug?

Originally created by @fd0 on GitHub (Mar 22, 2016). Original GitHub issue: https://github.com/netblue30/firejail/issues/375 Hi, thanks for writing firejail! When using `--x11` to start a separate X server for a program, exiting the program also kills the normal X server so my session is terminated. This seems to be a bug. I can reproduce this on Archlinux with firejail compiled from git (`r712.431d39d-1`) and `xpra-winswitch` version 0.16.2-1. Is there anything I can do to help solving this bug?

gitea-mirror

2026-05-05 05:28:26 -06:00

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gitea-mirror commented

2026-05-05 05:28:33 -06:00

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@netblue30 commented on GitHub (Mar 22, 2016):

So far I couldn't get it to run at all with xpa-winswitch on my Arch box. I'll try to look into it.

Something to keep in mind: never run xpra as root, it will mess things up big time. After running xpra as root and before you log out from your session, make sure ~/.Xauthority file is still owned by your user. Somehow xpra makes it owned by root, and next time when you start your computer you won't be able to login.

@netblue30 commented on GitHub (Mar 22, 2016): So far I couldn't get it to run at all with xpa-winswitch on my Arch box. I'll try to look into it. Something to keep in mind: never run xpra as root, it will mess things up big time. After running xpra as root and before you log out from your session, make sure ~/.Xauthority file is still owned by your user. Somehow xpra makes it owned by root, and next time when you start your computer you won't be able to login.

gitea-mirror commented

2026-05-05 05:28:35 -06:00

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@fd0 commented on GitHub (Mar 22, 2016):

Is there a reason you chose Xpra over Xephyr? Thinking about it, Xephyr seems to be the more obvious choice...

@fd0 commented on GitHub (Mar 22, 2016): Is there a reason you chose Xpra over Xephyr? Thinking about it, Xephyr seems to be the more obvious choice...

gitea-mirror commented

2026-05-05 05:28:37 -06:00

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@netblue30 commented on GitHub (Mar 22, 2016):

You can use Xephyr right now:

$ Xephyr -ac -br -noreset -screen 800x600 :22 &
$ DISPLAY=:22 firejail --net=eth0 --blacklist=/tmp/.X11-unix/x0 firefox

I am running it on display :22, and I disable display :0 sockets. A nice touch would be to also start a light window manager such as OpenBox on display :22 in order to be able to move and resize the window.

I'll look into bringing Xephyr support in, thanks for the idea.

@netblue30 commented on GitHub (Mar 22, 2016): You can use Xephyr right now: ``` $ Xephyr -ac -br -noreset -screen 800x600 :22 & $ DISPLAY=:22 firejail --net=eth0 --blacklist=/tmp/.X11-unix/x0 firefox ``` I am running it on display :22, and I disable display :0 sockets. A nice touch would be to also start a light window manager such as OpenBox on display :22 in order to be able to move and resize the window. I'll look into bringing Xephyr support in, thanks for the idea.

gitea-mirror commented

2026-05-05 05:28:39 -06:00

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@netblue30 commented on GitHub (Mar 26, 2016):

I added support for Xephyr (--x11=xephyr)

@netblue30 commented on GitHub (Mar 26, 2016): I added support for Xephyr (--x11=xephyr)

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Reference: github-starred/firejail#270

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