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I know that 1777 is the default mode of /tmp on many Linux distros.

I haven't been able to find much online, but I'm wondering if making /tmp group- and/or world-readable is really necessary.

Can anyone suggest a reason that using a mode of 1733 (drwx-wx-wt) might not be acceptable?

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For temporary files created by applications, it won't make much of a difference: they almost always use a protected subdirectory with 0700, or at least a mktemp-generated filename. But for temporary files created by the user, it's a major inconvenience – you no longer know what you've put in there, even if you want to just remove it.

If you really want to isolate different users' files in /tmp, do that through namespaces: pam_namespace.so can create a fully separate view of /tmp for every user, and PrivateTmp= can do the same for systemd-managed services. (A special filesystem similar to bindfs could also provide this, especially for non-Linux operating systems.)

  • This is perfect, thank you so much for the recommendation! – Jared Brandt Aug 5 '18 at 0:16

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