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[172.221.246.205]) by smtp.gmail.com with ESMTPSA id g10-20020ae9e10a000000b0069f9daa1488sm262325qkm.95.2022.04.28.10.41.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Apr 2022 10:41:08 -0700 (PDT) From: Katherine Cox-Buday To: Aurora Subject: Re: Hardened toolchain 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> <87k0b93yaj.fsf@disp3269> Date: Thu, 28 Apr 2022 12:41:07 -0500 In-Reply-To: <87k0b93yaj.fsf@disp3269> (Aurora's message of "Thu, 28 Apr 2022 13:36:36 -0400") Message-ID: <87fslxds24.fsf@gmail.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=2607:f8b0:4864:20::72a; envelope-from=cox.katherine.e@gmail.com; helo=mail-qk1-x72a.google.com 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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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 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=1651169003; 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=WcEs9lQZ7w5WieZgNpPqs0ITZY0Xm/xBtEY2zpMts5U=; b=fhz8+t1WmdzprffIs5+peXU2iWkfgWg4qi76WVPm2hXZpfdJIeE9Hij0thKpdn22KEpl2e h/HG/ToZkaECmxbmbcgDr7xmAakXX3BagFsey5Yae+ePREGwhVrjjYpR2XdUBgxnjP1oku RGwiQ+Rp2PBvTe27yJN5D6JSCyYenwlkbONJZSPhB/XfcRT7NX5MgJHTB/Hsg0FBVfqFmE tvwVDAbVINz+XPT8uj/r3vCN7MicfVrWtVX++zIvo2MWByoMO1cl9BFlTv7mgZk4VumYjb h9D2nSrHtFdFULbgM0r/KmL2ZiVzB4vZBjBQqfFWfOBsNynK2ADvOFKQdRFoyg== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1651169003; a=rsa-sha256; cv=none; b=ey540Hb3Rjz4/Xfn9SK+wV3qE14212fFDioRwcnyz/spR83PxJ3as1ycAQ4zhTFJkx5Xu/ wU4EUcpoZhZ9lRj7VcDf2vEny6y3Q9ED6eSH0eg8aMzlx5I33IKNl1gBv2aZoDVgbT5AlX iF9KG2ZzWPIVwUovA+keQW6O9Y4SQ6XrFzFr35BKRjufCr6dte/0ZtQ4JbiSLrt242KWL7 iuS+lh/2KzHIeU8/jUoXoRSiEJypMkeAGcD8Gg3Nxe/XOvDJLceO4CnqWfsN0t/Mj6efuk BnasHS9cbfzQY7X8RMT/qV2M81/FhH2Lpq7rj6GueEB13CLgYoDzBgtLfr/QBQ== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gmail.com header.s=20210112 header.b=SFZ2aAKm; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); 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: 6.20 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gmail.com header.s=20210112 header.b=SFZ2aAKm; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); 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: 157BE396E5 X-Spam-Score: 6.20 X-Migadu-Scanner: scn1.migadu.com X-TUID: 8W6J4/CnlLKo Aurora writes: > 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? They are vulnerable to them, but not necessarily affected by them. Consider a computer not networked to the internet and only running trusted workloads (e.g. scientific HPC, etc.). This is why acknowledging that everyone has a different threat model is important. I hope this helps to clarify. Sincerely, -- Katherine