From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp11.migadu.com ([2001:41d0:8:6d80::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms5.migadu.com with LMTPS id DJx5MR8GcGJBXgAAbAwnHQ (envelope-from ) for ; Mon, 02 May 2022 18:26:07 +0200 Received: from aspmx1.migadu.com ([2001:41d0:8:6d80::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp11.migadu.com with LMTPS id GGdaMB8GcGLh6QAA9RJhRA (envelope-from ) for ; Mon, 02 May 2022 18:26:07 +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 9FA7F21B8C for ; Mon, 2 May 2022 18:26:03 +0200 (CEST) Received: from localhost ([::1]:37882 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nlYs6-00054j-6Z for larch@yhetil.org; Mon, 02 May 2022 12:26:02 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46060) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nlYrs-00054N-HO for guix-devel@gnu.org; Mon, 02 May 2022 12:25:48 -0400 Received: from laurent.telenet-ops.be ([2a02:1800:110:4::f00:19]:33194) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1nlYrq-0001Jt-O5 for guix-devel@gnu.org; Mon, 02 May 2022 12:25:48 -0400 Received: from ptr-bvsjgyhxw7psv60dyze.18120a2.ip6.access.telenet.be ([IPv6:2a02:1811:8c09:9d00:3c5f:2eff:feb0:ba5a]) by laurent.telenet-ops.be with bizsmtp id RsRj2700E4UW6Th01sRjgE; Mon, 02 May 2022 18:25:43 +0200 Message-ID: <599c070e48d782c5edf1b2a209c09a0489b79bc2.camel@telenet.be> Subject: Re: Hardened toolchain From: Maxime Devos To: zimoun , Ludovic =?ISO-8859-1?Q?Court=E8s?= , Maxim Cournoyer Date: Mon, 02 May 2022 18:25:43 +0200 In-Reply-To: <87h76ccha7.fsf@gmail.com> References: <874k3r8m4m.fsf@gmail.com> <8464b1bff3acb0a84f46ea6dcbbeaa7045b03d1c.camel@telenet.be> <874k3iwysf.fsf@gmail.com> <87pmm512uv.fsf@gnu.org> <87h76ccha7.fsf@gmail.com> Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-mK7oxSZp2wucT0t4a7kj" User-Agent: Evolution 3.38.3-1 MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=telenet.be; s=r22; t=1651508743; bh=DYOZ15Sprwot1rd6cg3YmfmNJRhfJm8I8BxpWoRPxmw=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=hl474poBiKbYTpBE4gdyulNW0p1Ue6yWREHs3evhqxPhIE9IzT+lJCzIH7zSfjWkN 1Yr75kYZBEw6e12mYesPQtnBVjqZGJSoGTgBzJ5CIRNo7SYJw+RGQFIu21CKcxdNnK heqPa2h+LkmwUVtACqsdE2y60qstAU2FjncDSPWdIsN/miW/jdGoCGopS0wEKWdhpW 5/82hXU9MjVNdga0k+jj0vT++ysZBMBLM87nvj05kiEHFT3u18cQVT6H/TvfsjLTdI SoZm3Q14CVVR345TYpAJgg2jeSkHi/XWVJ+sxBPVTEySlRSS5rTfMfN0ZEbJTl47nz O98/jhlFCJJIg== Received-SPF: pass client-ip=2a02:1800:110:4::f00:19; envelope-from=maximedevos@telenet.be; helo=laurent.telenet-ops.be X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action 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, kiasoc5@tutanota.com 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=1651508763; 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:in-reply-to:in-reply-to: references:references:list-id:list-help:list-unsubscribe: list-subscribe:list-post:dkim-signature; bh=DYOZ15Sprwot1rd6cg3YmfmNJRhfJm8I8BxpWoRPxmw=; b=R0eoIHrNOo3B6v2wnSgXdg0Z9UPF/5AMMGrxXGIqfblYd32kHn5Cd/BdEyYptjgvwTHzbx O1m2zI4hR31jJqk3oJ7z/2CF1hh6eYr5dJrx04dzYtPvPbIMAxRO5JbygsAykjxnIcJtXS 2KqnIIIRts8/+TJaNBCs+mFIkZ/3b0u1+uoEh1gWGnoe53NsA2otZLC7YXSkfo54IbyGiI SWtUo97+4uPmqyyiattuXiFLzSIQhh1gIvztADKvaKa72yDZ2j5wdfdRoy0YM4bORh2qY9 6kG/1DQNDx6F9nTdTdYBmFgXqroXqSaf1JA3gYNi/EiAiqDHmQDyq1sQCXcbxw== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1651508763; a=rsa-sha256; cv=none; b=NYeJHJ31EY5PJ3w71Mrz0O3/eEYLS20KPuzT5xnDEs02mVjoH2iuGGsLZZPl7sIQfTAT4m RmOJaEjnx8S3lm1zmw7wIvSdI9eIMJz0LvyRR5fc/aGxztX8GBLBPhqJfJN6llAP+5w4lf k729UakE4IF+mqktteegPKdKMCXkW7OFd/ENgCTSHHZ3P0Q4sNZr/PxcEPIr05HMiX+DVf EnX34t2/IRo/nZ7/6IiMh9eawf1pyNRREnNyuhw8IDDtI4n1B3W54fa/bcLA4loxdplC85 HJka3gSuV6V24JP92v6JEBqq9o/gm3bifmbX2c4V5aPOuNCBt1hh3LX//BPd1w== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=pass header.d=telenet.be header.s=r22 header.b=hl474poB; dmarc=pass (policy=none) header.from=telenet.be; 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: -3.18 Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=telenet.be header.s=r22 header.b=hl474poB; dmarc=pass (policy=none) header.from=telenet.be; 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: 9FA7F21B8C X-Spam-Score: -3.18 X-Migadu-Scanner: scn1.migadu.com X-TUID: KkZtJAQUJmOk --=-mK7oxSZp2wucT0t4a7kj Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable zimoun schreef op vr 29-04-2022 om 12:31 [+0200]: > > Stack smashing protection (SSP) may incur measurable run-time > > overhead > > though so enabling that one by default may be less consensual. >=20 > That=E2=80=99s true and it could be an issue for HPC practitioners.=C2=A0= [...] I'm not sure if this wasn't already mentioned, but HPC practicioners can already use --tune. Maybe HPC practicioners can have --without- hardening. However, in the computing I do that needs to be high performance (*), it seems that the expensive computations are matrix multiplications, eigenvector decompositions and the like. I wouldn't expect those kind of things to be hindered by hardening. (*) In my case, this is not about supercomputers or computer clusters, but about having software run fast enough on the hardware that is available. In some situations, that's a fancy supercomputer, but often a simple laptop can do ... if the software is sufficiently optimised. Greetings, Maxime. --=-mK7oxSZp2wucT0t4a7kj Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iI0EABYKADUWIQTB8z7iDFKP233XAR9J4+4iGRcl7gUCYnAGBxccbWF4aW1lZGV2 b3NAdGVsZW5ldC5iZQAKCRBJ4+4iGRcl7nwLAQCu17+lawlsliuA9puJevdxOynP wsXnmB4H7xHYUhzQhgEA8GhaPCC/lznbRxT59ZlPLnyr59mxY6J62qTa0mWRyg4= =M3mK -----END PGP SIGNATURE----- --=-mK7oxSZp2wucT0t4a7kj--