From: Maxime Devos <maximedevos@telenet.be>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: guix-devel@gnu.org
Subject: Re: Potential security weakness in Guix services
Date: Sat, 06 Feb 2021 23:01:49 +0100 [thread overview]
Message-ID: <3c869a8c38ba8c98e29a06de1404f9dbf8fe7a68.camel@telenet.be> (raw)
In-Reply-To: <87sg68zy15.fsf@gnu.org>
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On Sat, 2021-02-06 at 22:28 +0100, Ludovic Courtès wrote:
> Maxime Devos <maximedevos@telenet.be> skribis:
>
> I just remembered this subtlety: during bootup, the activation code is
> evaluated by the Guile that’s in the initrd, which is a
> statically-linked Guile, and thus we can’t use ‘dynamic-link’ & co. in
> there. :-/
I remember trying to use make-forkexec-constructor/container from activation
code, which didn't work, due to some uses of dynamic-func ... I see two
possible options to take:
* extend gnu/packages/patches/guile-linux-syscalls.patch with, say,
a "%extra-function-pointers" procedure returning a vector (or alist,
or something else) of pointers to the relevant C functions. This
allows us to write the FFI code mostly in Scheme, and only write C
code for obtaining function pointer.
* extend gnu/packages/patches/guile-linux-syscalls.patch with
additional bindings, or write a patch extending guile itself with
fchownat
and other *at support. This (second) patch should be
submitted upstream, but can be kept in gnu/packages/patches until
support for *at
functionality makes it upstream.
The first option is the path I would find the most convenient myself
(though I'll probably write C code for parsing struct stat, as its
layout apparently varies much with kernel (Linux / Hurd) and
architecture), but the latter seems the way to go to prevent duplicate
effort upstream later on.
My C is a little rusty, but I'll have a try at the latter.
Maxime.
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next prev parent reply other threads:[~2021-02-06 22:03 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-28 21:53 Potential security weakness in Guix services Leo Famulari
2021-01-29 13:33 ` Maxime Devos
2021-01-29 15:25 ` Maxime Devos
2021-02-01 15:35 ` Ludovic Courtès
2021-02-01 15:47 ` Julien Lepiller
2021-02-01 16:19 ` Maxime Devos
2021-02-02 13:07 ` Ludovic Courtès
2021-02-02 13:38 ` Maxime Devos
2021-02-02 15:30 ` Maxime Devos
2021-02-05 9:57 ` Ludovic Courtès
2021-02-05 12:20 ` Maxime Devos
2021-02-05 14:16 ` Maxime Devos
2021-02-06 21:28 ` Ludovic Courtès
2021-02-06 22:01 ` Maxime Devos [this message]
2021-02-10 20:45 ` Ludovic Courtès
2021-02-06 21:26 ` Ludovic Courtès
2021-02-14 12:29 ` TOCTTOU race (was: Potential security weakness in Guix services) Maxime Devos
2021-02-14 17:19 ` Bengt Richter
2021-02-18 17:54 ` TOCTTOU race Ludovic Courtès
2021-02-19 18:01 ` Maxime Devos
2021-02-22 8:54 ` Ludovic Courtès
2021-02-22 19:13 ` Maxime Devos
2021-02-23 15:30 ` Ludovic Courtès
2021-02-27 7:41 ` Maxime Devos
2021-03-10 10:07 ` Ludovic Courtès
2021-02-10 20:54 ` Potential security weakness in Guix services Christopher Lemmer Webber
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