From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp10.migadu.com ([2001:41d0:8:6d80::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms0.migadu.com with LMTPS id WJNpAIgqRGJqXQAAgWs5BA (envelope-from ) for ; Wed, 30 Mar 2022 12:01:44 +0200 Received: from aspmx1.migadu.com ([2001:41d0:8:6d80::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp10.migadu.com with LMTPS id gCy/NIcqRGIhywAAG6o9tA (envelope-from ) for ; Wed, 30 Mar 2022 12:01:43 +0200 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 7BFD52AC13 for ; Wed, 30 Mar 2022 12:01:43 +0200 (CEST) Received: from localhost ([::1]:36110 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nZV90-0008B9-9T for larch@yhetil.org; Wed, 30 Mar 2022 06:01:40 -0400 Received: from eggs.gnu.org ([209.51.188.92]:37140) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nZV7q-00089H-Kc for guix-devel@gnu.org; Wed, 30 Mar 2022 06:00:27 -0400 Received: from [2001:470:142:3::e] (port=58538 helo=fencepost.gnu.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nZV7p-0005iW-Lx; Wed, 30 Mar 2022 06:00:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-Version:In-Reply-To:Date:References:Subject:To: From; bh=tcN6B34RxG9Ztbc/1WCxUyLYUM6tXsVzazn+BE+RCgM=; b=sEB4ZQA/gyjLivhiito2 gsDz4Ys5UZtoid9HtOWgYC1bNAtIsp2iIz++MscFVzHhwKDKvgN01ugW6DJjp/msGdRHe/3bZX3pl OJiXfdH6tfvZzLRsX4TZwgQxZYZIdlqIxr7Q8EWvH5NZGqtDpToKU3SpYDLZh73q5qRdfBQVNdrXr hGU9Q1+STT++B8mJamx2ZaSq+ckVKmKo7uJ36IgFKlu+i6uXnlIjBL3es4iaSLlFBv5k1jY4ZTMkj dfj7F5JUQGSIgDp/PeMx6hcKm77VsPPoYs4wfzZzEPkDQQ2Io/vAOgcOBavVDU2VV+eteG0CVGkl1 zen0Cg85Yo1EJw==; Received: from 91-160-117-201.subs.proxad.net ([91.160.117.201]:57832 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nZV7S-0004DE-Ko; Wed, 30 Mar 2022 06:00:03 -0400 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= To: Philip McGrath Subject: Re: The Shepherd on Fibers References: <87ee2sfg9d.fsf@inria.fr> <4f889372-3464-92df-b350-b7c61e081f31@philipmcgrath.com> <9c53fc57b6e4d81b5b4447b5ed2d0797668a70ff.camel@telenet.be> <4129627e-da0a-d73a-c754-0a9df765cc01@philipmcgrath.com> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 10 Germinal an 230 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: Wed, 30 Mar 2022 12:00:00 +0200 In-Reply-To: <4129627e-da0a-d73a-c754-0a9df765cc01@philipmcgrath.com> (Philip McGrath's message of "Tue, 29 Mar 2022 07:11:25 -0400") Message-ID: <87sfqzvjz3.fsf@gnu.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (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: 2.1.29 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-To: larch@yhetil.org X-Migadu-Country: US ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1648634503; h=from:from:sender:sender: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: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post:dkim-signature; bh=tcN6B34RxG9Ztbc/1WCxUyLYUM6tXsVzazn+BE+RCgM=; b=olZ6YXeb3hsOl2sSWJfbbEjXsbjJ94OtQDnkM4HOrKPiJ3XVTinkt0VvVCiODpSZNigso8 lyI82IjW8ZZqck6keoWA7idQY7q8DFYCurD1t805Gvw4TQ9JKCy7wTenbTgScxiEBcFivg i+JvC6YVV8MzLtY1zPym4ZpAdbKP5cpHjwdB8ORkU5ifllAXt6BWrOzrbrbCPu8wNEY5wM 34jamnmdJi0r30cJGx1axD2+fA4yvQjv6BIQXEQmLB7O1di6M3giNJRZ34Dl5W/hQy4eha TfqevisdlOHHgqvpk7ugAQ4lGvdRTmr55AIwWMrt/kUe2oWz1XTdIf3gVNzfkw== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1648634503; a=rsa-sha256; cv=none; b=JPk56NfsrNsAU7ppak6H512kUIASF8ggmUM6ndplbvCXC/F0UYMjaXHLkyB1F4jIYUwTGC 46NUY3gneXXjFnHgKrYkNKOa+pUe3/k/p0PJtIClxcdftT9DsNObD17GonE2iVdLc4AK6d 4bVcmAxQYK2r5P/0nmcPR2pXDhkOLsAJTFDGTZVzJSAyA59aDpUEUez49xxaucTWJiZLh9 GYKsJ5swEOnLVpRT8NtjfRzGZRMDpxAKCxnLQp/QEfPPLpCLpdiYR1S2NknDUNDEO5kamm gKzYc3uEW5kKAHUhe65itVMt6nSmThEYKt4e9fNBfHpnnZvOWXhUn5GEL7lPFw== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=pass header.d=gnu.org header.s=fencepost-gnu-org header.b="sEB4ZQA/"; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -9.57 Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=gnu.org header.s=fencepost-gnu-org header.b="sEB4ZQA/"; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 7BFD52AC13 X-Spam-Score: -9.57 X-Migadu-Scanner: scn0.migadu.com X-TUID: abI3DJxhZZQV Philip McGrath skribis: > But, as the above paper says, this means that Chez's `call/cc`, > `dynamic-wind`, etc. are *unsafe* from the perspective of Racket's > control primitives. From the docs for Racket's `ffi/unsafe/vm` library [6= ]: I think that=E2=80=99s the crux of the problem and widely recognized: =E2=80=98dynamic-wind=E2=80=99 and =E2=80=98call/cc=E2=80=99 should be avoi= ded. This was also mentioned in the context of Rees=E2=80=99 1996 =E2=80=9CSecurity Kernel=E2=80=9D pape= r=C2=B9. Ludo=E2=80=99. =C2=B9 http://mumble.net/~jar/pubs/secureos/