From: Ricardo Wurmus <rekado@elephly.net>
To: guix-devel@gnu.org
Subject: “guix system container” script must run as root
Date: Tue, 09 Aug 2022 17:13:28 +0200 [thread overview]
Message-ID: <87y1vxv2q3.fsf@elephly.net> (raw)
Hi Guix,
I see that the container script generated by “guix system container”
must be run as root. Looking at “initialize-user-namespace” in (gnu
build linux-container) there is conditional code to be executed only
when running as an unprivileged user, namely writing to
/proc/pid/setgroups. This makes me think that this was originally meant
to be usable without root privileges.
Without root privileges write access to /proc/pid/* is denied. The
child process here is the result of issuing a clone syscall.
Why can’t the parent process write to the child’s /proc/pid/* files?
Why does the parent process need to do this at all? Can’t the child
process take care of writing its /proc/self/uid_map?
--
Ricardo
next reply other threads:[~2022-08-09 16:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-09 15:13 Ricardo Wurmus [this message]
2022-08-09 16:23 ` “guix system container” script must run as root Ricardo Wurmus
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