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[Plash] Re: Sending signals to sandboxed processes

From: Thomas Leonard
Subject: [Plash] Re: Sending signals to sandboxed processes
Date: Sun, 13 Feb 2011 16:19:13 +0000

On 19 November 2006 20:40, Thomas Leonard <address@hidden> wrote:
> Is there any way to send a signal (e.g. SIGTERM) to a plash process
> from outside the sandbox?
> Sending signals via the tty (^C etc) works fine, but sending using
> kill(2) doesn't seem to be possible (presumably because all the uids
> are different).

Would it be possible to use clone(2) with CLONE_NEWPID to get this behaviour?

Then the sandboxed processes would run with the same UID as the user,
but they can only send signals within the sandbox because PIDs are
unique to the sandbox. e.g. within the sandbox, the top-level process
is PID 1. Outside of the sandbox, it has a different PID and can be
killed by the user with no special privileges. This also allows
processes to see a restricted view of /proc.

Dr Thomas Leonard
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