Am 26.03.2021 um 10:17 schrieb Daniel Golle:
On Fri, Mar 26, 2021 at 09:32:33AM +0100, e9hack wrote:
Hi,
a program run by ujail gets a PID of 1. The real PID is different. If such a
program generates a PID file by its own and the PID from that file is used by a
script that is not run by ujail, then any operation will be performed with the
wrong PID, which is the PID of /sbin/procd in the real world.
Is this the expected behaviour?
Yes, this is expected behaviour as the program run by ujail ends up in
a new PID namespace (so that it cannot "see" other running processes).
If this presents a problem to your use-case, I can add an option to
have a the process live in the root PID namespace instead (ie. trade
some isolation for interoperatibility).
I use a modified init script for dnsmasq and let dnsmasq generate the PID file. Another
script is using this PID file and this doesn't work as I switched to ujail. I have
changed it now. The PID file is generated via "procd_set_param pidfile ...".
Regards,
Hartmut
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