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[GH-ISSUE #203] Question about shell=none #140

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opened 2026-05-05 05:09:13 -06:00 by gitea-mirror · 4 comments

gitea-mirror commented

2026-05-05 05:09:13 -06:00

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Originally created by @nick75e on GitHub (Dec 28, 2015).
Original GitHub issue: https://github.com/netblue30/firejail/issues/203

Hi!
With versions 0.9.32 and earlier, when I wanted to join an existing firejail session with shell none, it would tell me that it's already in use and then deny access. But with 0.9.34, I can join in.
Is it on purpose?

Thanks.

Originally created by @nick75e on GitHub (Dec 28, 2015). Original GitHub issue: https://github.com/netblue30/firejail/issues/203 Hi! With versions 0.9.32 and earlier, when I wanted to join an existing firejail session with `shell none`, it would tell me that it's already in use and then deny access. But with 0.9.34, I can join in. Is it on purpose? Thanks.

gitea-mirror closed this issue

2026-05-05 05:09:14 -06:00

gitea-mirror commented

2026-05-05 05:09:18 -06:00

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@netblue30 commented on GitHub (Dec 29, 2015):

Yes, it will join the sandbox if /bin/bash or /bin/sh is available inside the sandbox. The idea is to provide a way to modify a running sandbox.

@netblue30 commented on GitHub (Dec 29, 2015): Yes, it will join the sandbox if /bin/bash or /bin/sh is available inside the sandbox. The idea is to provide a way to modify a running sandbox.

gitea-mirror commented

2026-05-05 05:09:20 -06:00

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@nick75e commented on GitHub (Dec 29, 2015):

Then what does shell none actually do?
I thought it was to prevent apps from accessing the shell within the sandbox.
PS: Sorry for the stupid questions but I'm a little lost here

@nick75e commented on GitHub (Dec 29, 2015): Then what does `shell none` actually do? I thought it was to prevent apps from accessing the shell within the sandbox. PS: Sorry for the stupid questions but I'm a little lost here

gitea-mirror commented

2026-05-05 05:09:22 -06:00

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@netblue30 commented on GitHub (Dec 29, 2015):

It starts the application directly, without a shell. However, --join creates a new shell in the sandbox. The shell is running in parallel with your application. Your application still runs outside the shell, but it could create a shell of its own.

@netblue30 commented on GitHub (Dec 29, 2015): It starts the application directly, without a shell. However, --join creates a new shell in the sandbox. The shell is running in parallel with your application. Your application still runs outside the shell, but it could create a shell of its own.

gitea-mirror commented

2026-05-05 05:09:24 -06:00

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@nick75e commented on GitHub (Dec 29, 2015):

Now I understand!
Thanks for answering and the release of 0.9.36 btw.

@nick75e commented on GitHub (Dec 29, 2015): Now I understand! Thanks for answering and the release of 0.9.36 btw.

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Reference: github-starred/firejail#140

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