From: Thiago Jung Bauermann via Guix-patches via <guix-patches@gnu.org>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: 54997@debbugs.gnu.org
Subject: [bug#54997] [PATCH 04/12] Add (guix least-authority).
Date: Fri, 22 Apr 2022 17:10:19 -0300 [thread overview]
Message-ID: <87h76klv6j.fsf@kolabnow.com> (raw)
In-Reply-To: <20220417210453.27884-4-ludo@gnu.org>
Hello,
Ludovic Courtès <ludo@gnu.org> writes:
> + (reify-exit-status
> + (call-with-container mounts
> + (lambda ()
> + (chdir #$directory)
> + (environ variables)
> + (apply execl #$program #$program (cdr (command-line))))
I'm a bit concerned about running arbitrary commands as PID 1 of process
namespaces. A process running as PID 1 (even in a child namespace) is a
special case and is treated differently by the Linux kernel than any
other process, so it needs to be a program that has been designed to
work in that situation. There are two differences from regular
processes:
1. PID 1 inherits orphan processes and needs to wait() on them when they
quit, in order to avoid accumulating zombie processes in the system.
2. Unlike regular processes, PID 1 doesn't have default signal handlers.
Both of these aspects are described in more detail here:
https://github.com/krallin/tini/issues/8#issuecomment-146135930
So to avoid an accumulation of zombie processes and other signal-related
problems, I suggest adding a “(init-program ,tini)” parameter to
‘least-authority-wrapper’ and executing ‘program’ as a subprocess of
‘tini’ or whatever was passed as the #:init-program (perhaps #f could
mean running ‘program’ directly as PID 1).
I mention this because I'm currently dealing with a problem that has
exactly this root cause: I'm working on updating the public-inbox
package to the latest version, and the testsuite is failing because it
tests that lei's daemon process is correctly terminated. But that
doesn't work because “guix build” doesn't use a proper init program as
PID 1 and thus the daemon process goes to zombie state and the testsuite
thinks that it didn't go away. I'm hoping to send a patch to fix that
issue.
--
Thanks
Thiago
next prev parent reply other threads:[~2022-04-22 20:29 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-17 21:01 [bug#54997] [PATCH 00/12] Add "least authority" program wrapper Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 01/12] gexp: Add 'references-file' Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 02/12] file-systems: Avoid load-time warnings when attempting to load (guix store) Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 03/12] linux-container: 'call-with-container' relays SIGTERM and SIGINT Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 04/12] Add (guix least-authority) Ludovic Courtès
2022-04-18 9:15 ` Maxime Devos
2022-04-19 22:04 ` [bug#54997] [PATCH 00/12] Add "least authority" program wrapper Ludovic Courtès
2022-04-18 9:18 ` [bug#54997] [PATCH 04/12] Add (guix least-authority) Maxime Devos
2022-04-19 22:05 ` [bug#54997] [PATCH 00/12] Add "least authority" program wrapper Ludovic Courtès
2022-04-22 20:10 ` Thiago Jung Bauermann via Guix-patches via [this message]
2022-04-26 20:30 ` Ludovic Courtès
2022-04-29 3:43 ` Thiago Jung Bauermann via Guix-patches via
2022-04-26 20:48 ` Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 00/15] " Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 01/15] gexp: Add 'references-file' Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 02/15] file-systems: Avoid load-time warnings when attempting to load (guix store) Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 03/15] linux-container: 'call-with-container' relays SIGTERM and SIGINT Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 04/15] linux-container: Ensure signal-handling asyncs get a chance to run Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 05/15] linux-container: Add #:child-is-pid1? parameter to 'call-with-container' Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 06/15] Add (guix least-authority) Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 07/15] services: dicod: Rewrite using 'least-authority-wrapper' Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 08/15] services: dicod: Use 'make-inetd-constructor' Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 09/15] services: bitlbee: " Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 10/15] services: ipfs: Adjust for Shepherd 0.9 Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 11/15] services: ipfs: Use 'least-authority-wrapper' Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 12/15] services: wesnothd: Grant write access to /var/run/wesnothd Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 13/15] services: wesnothd: Use 'least-authority-wrapper' Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 14/15] services: quassel: " Ludovic Courtès
2022-04-27 16:56 ` [bug#54997] [PATCH v2 15/15] services: opendht: " Ludovic Courtès
2022-05-01 20:16 ` bug#54997: [PATCH 00/12] Add "least authority" program wrapper Ludovic Courtès
2022-05-02 4:25 ` [bug#54997] " Thiago Jung Bauermann via Guix-patches via
2022-04-17 21:04 ` [bug#54997] [PATCH 05/12] services: dicod: Rewrite using 'least-authority-wrapper' Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 06/12] services: dicod: Use 'make-inetd-constructor' Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 07/12] services: bitlbee: " Ludovic Courtès
2022-04-18 9:13 ` Maxime Devos
2022-04-19 22:03 ` [bug#54997] [PATCH 00/12] Add "least authority" program wrapper Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 08/12] services: ipfs: Adjust for Shepherd 0.9 Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 09/12] services: ipfs: Use 'least-authority-wrapper' Ludovic Courtès
2022-04-18 9:08 ` Maxime Devos
2022-04-19 22:02 ` [bug#54997] [PATCH 00/12] Add "least authority" program wrapper Ludovic Courtès
2022-04-22 14:39 ` Maxime Devos
2022-04-27 22:01 ` Ludovic Courtès
2022-04-28 11:29 ` Maxime Devos
2022-04-28 19:25 ` Ludovic Courtès
2022-04-28 19:52 ` Maxime Devos
2022-04-17 21:04 ` [bug#54997] [PATCH 10/12] services: wesnothd: Grant write access to /var/run/wesnothd Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 11/12] services: wesnothd: Use 'least-authority-wrapper' Ludovic Courtès
2022-04-17 21:04 ` [bug#54997] [PATCH 12/12] services: quassel: " Ludovic Courtès
2022-04-18 9:12 ` Maxime Devos
2022-04-19 21:59 ` [bug#54997] [PATCH 00/12] Add "least authority" program wrapper Ludovic Courtès
2022-04-22 5:01 ` [bug#54997] [PATCH 01/12] gexp: Add 'references-file' Thiago Jung Bauermann via Guix-patches via
2022-04-26 20:17 ` [bug#54997] [PATCH 00/12] Add "least authority" program wrapper Ludovic Courtès
2022-04-22 15:02 ` Maxime Devos
2022-04-26 20:22 ` Ludovic Courtès
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