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 2ENhKL3QamLKHQAAbAwnHQ (envelope-from ) for ; Thu, 28 Apr 2022 19:37:01 +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 gCWgKL3QamLrcAEA9RJhRA (envelope-from ) for ; Thu, 28 Apr 2022 19:37:01 +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 7F38838BAA for ; Thu, 28 Apr 2022 19:37:01 +0200 (CEST) Received: from localhost ([::1]:46440 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nk84a-0000VW-9x for larch@yhetil.org; Thu, 28 Apr 2022 13:37:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56006) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nk84L-0000VN-Su for guix-devel@gnu.org; Thu, 28 Apr 2022 13:36:46 -0400 Received: from knopi.disroot.org ([178.21.23.139]:46312) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nk84J-0006Q4-OB for guix-devel@gnu.org; Thu, 28 Apr 2022 13:36:45 -0400 Received: from localhost (localhost [127.0.0.1]) by disroot.org (Postfix) with ESMTP id C279342AED; Thu, 28 Apr 2022 19:36:41 +0200 (CEST) X-Virus-Scanned: SPAM Filter at disroot.org Received: from knopi.disroot.org ([127.0.0.1]) by localhost (disroot.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HpB0lSSrsB0W; Thu, 28 Apr 2022 19:36:40 +0200 (CEST) References: <874k3r8m4m.fsf@gmail.com> <8464b1bff3acb0a84f46ea6dcbbeaa7045b03d1c.camel@telenet.be> <874k3iwysf.fsf@gmail.com> <87pmm512uv.fsf@gnu.org> <86ee1ys55z.fsf@163.com> <20220415183441.49a2628b@riseup.net> <87bkwonlwh.fsf@gmail.com> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=disroot.org; s=mail; t=1651167400; bh=iRdTQwflDLW/wcAyclSzIK0rwqQktkwmPJMbgLhm3cc=; h=References:From:To:Cc:Subject:In-reply-to:Date; b=e05YeaSq3xLChYUtPxSuN7Ngrr+0lt1+5BjoeXt9q9VuNnT+7zer86l4HlmUd1FEf 9Otgd0OI2mE1/Z477J9Awh0FlMvgHzkqR9qJjJbu7TOPB2474h2tbRLFEO/zJbv0hc SxDNB5/jLmZdhqb811HNFI1nmbMtWlrB5lhP67VTpibOhNAczN2HsfKUPSXK0tfFV0 KpTsfdj6Uc4Sek0pj4JpKzlSS2TJCLrzE3rv2WJH9JkDZwsT0p6jDfc6UUUidZQB6q KcjwMQngkCO37znApEcyXXucaEVwbhBUH0dIQ4oS44hvWnDa5P0UOH3P+M3lcBCajw nJ8MOH02cs4FA== From: Aurora To: Katherine Cox-Buday Cc: raingloom , guix-devel@gnu.org Subject: Re: Hardened toolchain In-reply-to: <87bkwonlwh.fsf@gmail.com> Date: Thu, 28 Apr 2022 13:36:36 -0400 Message-ID: <87k0b93yaj.fsf@disp3269> Mime-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=178.21.23.139; envelope-from=rind38@disroot.org; helo=knopi.disroot.org X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, 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: , 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=1651167421; 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=iRdTQwflDLW/wcAyclSzIK0rwqQktkwmPJMbgLhm3cc=; b=fNuqi1CrvrCqW/+R8DA6ms9q0EM9dzMhDQse+4zR0b4TrPkY82VsFSmaZ6m9sUQarfVL59 7wi6qvIy9xXkUGOsKvyO4rqrrKuHlQXK7zptkbF3p0pGpOznbUwKKdLS533KQaHFjO+EDY ik/getKGt1pgP3jHlxXGhZd4OVFnC93ndaZgO+8vc0tEYV4+E56QdSjGwvKZXDh9mMpYl8 qDSiAMChFSu/he1QvGKmFzBKAMgZBBP9sQnovIheZslxfWlIJv3Caeav4hoItcO3kOOHID z64ieDihGv6vDC8qqljzIKinGAPXgYRWPEYi3eCCH4BiuZX1lanS0mTI5WkH7A== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1651167421; a=rsa-sha256; cv=none; b=tZ+1QPes22k0ndbcbWZnsn0Oyt736WjHwHBAr4IjFSxtXzOKu4p6zcYM3tDrDcRlLBhtz+ gSqBrZYIUBjtbxnbeZ9JCUPtwoQ1l4+kru3yEZ36o72/GHyy6orEgRa5Xl9zLS5z5Z+znf Jfw5DJhPlx82nAA/0GV96IkZcAytLUCt7uwtGwsqlEdC0FJMoFKXY/UN4Uw7EwkU36Xsyq 8RTgYtDH8qosnfgAoLwlmOStB9cTGo6bxXT6PylVX10CBxBxAvYagFZE0EL8h17r9KCeM3 01Jc5wPUcpt2LcbBxaoOmhmyIoUaB7chQ3geKHIp+tBcuDdLbMe8vlxRQJcWhg== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=pass header.d=disroot.org header.s=mail header.b=e05YeaSq; dmarc=pass (policy=quarantine) header.from=disroot.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: -3.00 Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=disroot.org header.s=mail header.b=e05YeaSq; dmarc=pass (policy=quarantine) header.from=disroot.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: 7F38838BAA X-Spam-Score: -3.00 X-Migadu-Scanner: scn1.migadu.com X-TUID: 4ZdM/u/pj48m Katherine Cox-Buday writes: > Everyone has different threat models and needs. A lot of computers have CPU speculative execution attack mitigation disabled because those types of attacks will never affect those computers, and it reduces the performance of the CPU a lot. There are multicore processors made in the last decade or two that aren't affected by speculative execution vulnerabilities?