From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp12.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms0.migadu.com with LMTPS id A6X7CwsaHmLGDgAAgWs5BA (envelope-from ) for ; Tue, 01 Mar 2022 14:05:15 +0100 Received: from aspmx1.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp12.migadu.com with LMTPS id AM9vBwsaHmKpSQEAauVa8A (envelope-from ) for ; Tue, 01 Mar 2022 14:05:15 +0100 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 7354F4100D for ; Tue, 1 Mar 2022 14:05:14 +0100 (CET) Received: from localhost ([::1]:42612 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nP2Bl-00048e-6R for larch@yhetil.org; Tue, 01 Mar 2022 08:05:13 -0500 Received: from eggs.gnu.org ([209.51.188.92]:48552) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nP2Ba-000488-PW for guix-patches@gnu.org; Tue, 01 Mar 2022 08:05:03 -0500 Received: from debbugs.gnu.org ([209.51.188.43]:41944) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1nP2Ba-00064C-Fi for guix-patches@gnu.org; Tue, 01 Mar 2022 08:05:02 -0500 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1nP2Ba-0001iB-9A for guix-patches@gnu.org; Tue, 01 Mar 2022 08:05:02 -0500 X-Loop: help-debbugs@gnu.org Subject: [bug#54205] [PATCH v2] Factor out a public FORK-AND-CALL. Resent-From: Attila Lendvai Original-Sender: "Debbugs-submit" Resent-CC: guix-patches@gnu.org Resent-Date: Tue, 01 Mar 2022 13:05:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 54205 X-GNU-PR-Package: guix-patches X-GNU-PR-Keywords: patch To: Liliana Marie Prikler Cc: 54205@debbugs.gnu.org Received: via spool by 54205-submit@debbugs.gnu.org id=B54205.16461398926559 (code B ref 54205); Tue, 01 Mar 2022 13:05:02 +0000 Received: (at 54205) by debbugs.gnu.org; 1 Mar 2022 13:04:52 +0000 Received: from localhost ([127.0.0.1]:35841 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1nP2BQ-0001hj-Fv for submit@debbugs.gnu.org; Tue, 01 Mar 2022 08:04:52 -0500 Received: from mail-4022.proton.ch ([185.70.40.22]:41133) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1nP2BO-0001hU-9V for 54205@debbugs.gnu.org; Tue, 01 Mar 2022 08:04:51 -0500 Date: Tue, 01 Mar 2022 13:04:40 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lendvai.name; s=protonmail3; t=1646139881; bh=Tu5CROJJJw2vnjTwL8skTYxkc7BCk9MDP92jYn3Qj7A=; h=Date:To:From:Cc:Reply-To:Subject:Message-ID:In-Reply-To: References:From:To:Cc:Date:Subject:Reply-To:Feedback-ID: Message-ID; b=ONBLaHfECFtQs7N3SPf8652/Zg17tuB4NJ4fF3CimCJ4QVn+9TkBJw5Of6uvZLy0e CJ735eqep2PNRLozr4rWRDS0ShQyLqx5qnfJflg7SDuYWk7MBgO4cH4U8/hPIPRbjq QdQuBVlxGdKjm/oH41L35hWYqbeMiPrXybj6KvQ3AP3WmlDuitAqwXdQx55Y8ZiSLC Oh2PBDpVnVnS2UoSz4T2Lt/8rA85dZ8sVnSXIPH27P9TLCEiuBLdm5knDJoqf489lu dIuaCRCxEGwVyBzV9ZbkzE109yvVZ4rlBULphD9ffZVCAEu7chDnKzpXXm9TlqdI+f /dbRxKLP8iK7Q== From: Attila Lendvai Message-ID: In-Reply-To: References: <20220301072927.26525-1-attila@lendvai.name> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: guix-patches@gnu.org List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Attila Lendvai Errors-To: guix-patches-bounces+larch=yhetil.org@gnu.org Sender: "Guix-patches" X-Migadu-Flow: FLOW_IN X-Migadu-Country: US ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1646139915; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding:resent-cc: resent-from:resent-sender:resent-message-id:in-reply-to:in-reply-to: references:references:list-id:list-help:list-unsubscribe: list-subscribe:list-post:dkim-signature; bh=Tu5CROJJJw2vnjTwL8skTYxkc7BCk9MDP92jYn3Qj7A=; b=OviTJ3BeJcqXijgRsHQb+ytl+ut4lAOkmAj51qpHdDwcFh9gPeIhmDETvG+YaEQAfuafV+ pFVsY8z+ZE8IGJU+/Ir56g7Is/ZEAGTIaHJQuFek1zyo2VGg6Ju6VtsbACgP9Rq9RwClcZ rG3DJzA1sY7uHYV5Hye2jWdtqp5NAdcv0ol0+Z+oJPgnw7j8/FP3WIj9W9Xtl/wqkEjLgd btJpZkzVl99dr5w9BD1bvuN+Anpeilqilcl0noIUVBAlTAzTvx84zsvEfHB2F4voi8LyMe tgvU8sCwOLGqVOWnWCo/GIUvGKLn3Hv6nV+P2flt0OCSW21TZ9E5uXpZRYNOJg== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1646139915; a=rsa-sha256; cv=none; b=WxkuRJxjbczMOtW/VmKMPilrhudZwJt/qKpOW7BlTE7FVM9kr9migU1KG5sWSwj4DcnjC+ OY4ak8/QbBI9mSV3Y6RYCMMuyRTof4fTSKV1XmZKumZlBka6FCuMuRsP1PVBrvFNooUiXQ 8dfvgmehmHu+Yq/D3VySf5Tk6xMJxdrLPQ2PkjX+m5zvdTY3JSBwY6Qwqp2gB3PIk6UkHk tNTiRQduMA/2x5z7D53Q10Va+2U2rUI1Hrt2e3W2UVxL1f0XlcqVonNXQuGLE7o6MGObk2 xXaophOo60NymZqkO3VHa8TyDYglGL+514T25IvCjWOuyYkEU8qapN3k3JUQXA== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=lendvai.name header.s=protonmail3 header.b=ONBLaHfE; dmarc=none; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: 0.81 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=lendvai.name header.s=protonmail3 header.b=ONBLaHfE; dmarc=none; spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 7354F4100D X-Spam-Score: 0.81 X-Migadu-Scanner: scn1.migadu.com X-TUID: 1Zid9X9efYaQ > In general, I think such capabilities should be added to exec-command, > rather than resorting to a lambda. It takes a little while to realize > that call-in-fork, fork-and-call or whatever you want to name it is in > fact not pure evil; mainly because shepherd could in its stead already > invoke any lambda you throw at it. That being said, one should always > be aware that this child process runs with the full permissions of > shepherd, which you normally don't want to do for a service. does the above mean that you're concerned about the security implications? = if so, then i don't understand, because Guile already allows calling/accessing private functions/symbols, and thus this change doesn't really increase the (already enormous) attack surface in the guile codebase. it does increase the shoot-oneself-in-the-foot-surface a little bit, though= . it's worth pointing out, though, that trusting a channel, and adding a shep= herd service defined by it to the machine's config, is essentially giving root a= ccess to the channel author. and this is already the case, prior to my change. BTW, can i not already simply pass 0, or "root" as #:user to EXEC-COMMAND? > In my opinion, it ought to be > > > +(define* (fork+apply proc . args) > [...] > > WDYT? makes sense, i'll update the patch... but given the feedback from the two o= f you, should i? i think i'll abandon this, and implement Maxime's #:rlimits suggestion. i'm not sure how much better that will be, but at least it won't make futur= e threading harder, and allows me to make progress with my project. if anyone prefers the FORK+APPLY version, then do speak up! -- =E2=80=A2 attila lendvai =E2=80=A2 PGP: 963F 5D5F 45C7 DFCD 0A39 -- =E2=80=9CAn atheist doesn't have to be someone who thinks he has a proof th= at there can't be a god. He only has to be someone who believes that the ev= idence on the God question is at a similar level to the evidence on the wer= ewolf question.=E2=80=9D =09=E2=80=94 John McCarthy (1927=E2=80=932011), father of Lisp