[LSM/Landlock] Adding ability to sandbox TTYs

[COHEN-SCALI Remi (AMPERE)]

Hi

A feature request on landlock is about sandboxing ttys management. I'd like to propose an api for this feature but before I'd like to hear from you about what could be proposed to developers.
Of course the standard approach can be provided for "locking" access to some syscalls. It will allow a dev to setup a ttys mngt for his app and then lock it. However I think this will not be enough for most of the use case for applications making an intensive usage of tty framework.
So I will go first by proposing a standard approach. But in a second step, and for also allowing apps having an intensive ttys framework usage to use landlock, I think it could be interesting to propose another approach: 
something as... providing the app a way to define several configurations and allow it to switch from one to another
or ...

Have you got ideas for this ... I can't wait hearing from you if you have ideas about ...

Thanks

PS: I saw @gnoack proposals about this tty handling in landlock and  they seems to be, at least, a good starting point. I'm also looking at several apps using teletypewriter management (gtkterm, minicom,  vterm, shells and one I specifically love and use, emacs).

Rc5kali

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