From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp2 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id cwAAOQIKH2CfVgAA0tVLHw (envelope-from ) for ; Sat, 06 Feb 2021 21:28:34 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp2 with LMTPS id +HIzNAIKH2AvYgAAB5/wlQ (envelope-from ) for ; Sat, 06 Feb 2021 21:28:34 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id AAFF9940105 for ; Sat, 6 Feb 2021 21:28:34 +0000 (UTC) Received: from localhost ([::1]:60478 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l8V85-00082v-Mv for larch@yhetil.org; Sat, 06 Feb 2021 16:28:33 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:48526) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l8V7x-00082n-VF for guix-devel@gnu.org; Sat, 06 Feb 2021 16:28:25 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]:46835) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l8V7x-0007tH-A9; Sat, 06 Feb 2021 16:28:25 -0500 Received: from [2a01:e0a:1d:7270:af76:b9b:ca24:c465] (port=41578 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1l8V7w-0001ZM-Co; Sat, 06 Feb 2021 16:28:24 -0500 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= To: Maxime Devos Subject: Re: Potential security weakness in Guix services References: <87k0rrls0z.fsf@gnu.org> <08F0CD76-DDCF-4CFA-AE8D-5FB165A62B25@lepiller.eu> <87o8h2ehy7.fsf@gnu.org> <69968b3a01d872cabdf55a94b6c82d5057e010c9.camel@telenet.be> <87v9b66dm1.fsf@gnu.org> <56adb5efa894304c27beba99b07e2f8cfd8ee7cb.camel@telenet.be> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 18 =?utf-8?Q?Pluvi=C3=B4se?= an 229 de la =?utf-8?Q?R=C3=A9volution?= X-PGP-Key-ID: 0x090B11993D9AEBB5 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 3CE4 6455 8A84 FDC6 9DB4 0CFB 090B 1199 3D9A EBB5 X-OS: x86_64-pc-linux-gnu Date: Sat, 06 Feb 2021 22:28:22 +0100 In-Reply-To: (Maxime Devos's message of "Fri, 05 Feb 2021 15:16:39 +0100") Message-ID: <87sg68zy15.fsf@gnu.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: guix-devel@gnu.org Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Migadu-Flow: FLOW_IN X-Migadu-Spam-Score: -2.86 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Migadu-Queue-Id: AAFF9940105 X-Spam-Score: -2.86 X-Migadu-Scanner: scn1.migadu.com X-TUID: +5O73YzDZ4fn Maxime Devos skribis: > On Fri, 2021-02-05 at 13:20 +0100, Maxime Devos wrote: >> On Fri, 2021-02-05 at 10:57 +0100, Ludovic Court=C3=A8s wrote: >> > [...] >> [...] >>=20 >> I'll try to implement this API in Scheme (using the FFI), and post >> it at https://notabug.org/mdevos/things. I'll post a follow-up >> messsage once I've implemented the basics (openat, chmodat, >> chownat). > > Ping! > https://notabug.org/mdevos/things/src/a0715e6758ad43252e16993dcf688a25156= 057f3/fs-at.scm Nice! I just remembered this subtlety: during bootup, the activation code is evaluated by the Guile that=E2=80=99s in the initrd, which is a statically-linked Guile, and thus we can=E2=80=99t use =E2=80=98dynamic-lin= k=E2=80=99 & co. in there. :-/ (That=E2=80=99s why we carry =E2=80=98guile-linux-syscalls.patch=E2=80=99.) Ludo=E2=80=99.