From nobody Wed Aug 09 13:08:46 2023 X-Original-To: freebsd-security@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4RLVlr3qMHz4pxZG for ; Wed, 9 Aug 2023 13:10:16 +0000 (UTC) (envelope-from naddy@mips.inka.de) Received: from mail.inka.de (mail.inka.de [IPv6:2a04:c9c7:0:1073:217:a4ff:fe3b:e77c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4RLVlp0qvKz4JYC for ; Wed, 9 Aug 2023 13:10:13 +0000 (UTC) (envelope-from naddy@mips.inka.de) Authentication-Results: mx1.freebsd.org; dkim=none; spf=none (mx1.freebsd.org: domain of naddy@mips.inka.de has no SPF policy when checking 2a04:c9c7:0:1073:217:a4ff:fe3b:e77c) smtp.mailfrom=naddy@mips.inka.de; dmarc=none Received: from mips.inka.de (naddy@[127.0.0.1]) by mail.inka.de with uucp (rmailwrap 0.5) id 1qTiwv-008cEM-9g; Wed, 09 Aug 2023 15:10:05 +0200 Received: from lorvorc.mips.inka.de (localhost [127.0.0.1]) by lorvorc.mips.inka.de (8.17.1/8.17.1) with ESMTP id 379D8kEs082588 for ; Wed, 9 Aug 2023 15:08:46 +0200 (CEST) (envelope-from naddy@lorvorc.mips.inka.de) Received: (from naddy@localhost) by lorvorc.mips.inka.de (8.17.1/8.17.1/Submit) id 379D8kgQ082587 for freebsd-security@freebsd.org; Wed, 9 Aug 2023 15:08:46 +0200 (CEST) (envelope-from naddy) Date: Wed, 9 Aug 2023 15:08:46 +0200 From: Christian Weisgerber To: freebsd-security@freebsd.org Subject: Re: Downfall microcode update Message-ID: References: <189d93e0238.2805.fa4b1493b064008fe79f0f905b8e5741@Leidinger.net> List-Id: Security issues List-Archive: https://lists.freebsd.org/archives/freebsd-security List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-security@freebsd.org X-BeenThere: freebsd-security@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <189d93e0238.2805.fa4b1493b064008fe79f0f905b8e5741@Leidinger.net> X-Spamd-Result: default: False [-1.94 / 15.00]; AUTH_NA(1.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-0.999]; NEURAL_HAM_SHORT(-0.99)[-0.988]; NEURAL_HAM_LONG(-0.85)[-0.851]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[inka.de]; MLMMJ_DEST(0.00)[freebsd-security@freebsd.org]; R_SPF_NA(0.00)[no SPF record]; ARC_NA(0.00)[]; R_DKIM_NA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; MID_RHS_MATCH_FROMTLD(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; ASN(0.00)[asn:202113, ipnet:2a04:c9c0::/29, country:DE]; FROM_HAS_DN(0.00)[]; FREEFALL_USER(0.00)[naddy]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-security@freebsd.org]; RCVD_TLS_LAST(0.00)[] X-Spamd-Bar: - X-Rspamd-Queue-Id: 4RLVlp0qvKz4JYC Alexander Leidinger: > The real microcode is in sysutils/devcpu-data-intel and updated much more > recently. > > You can load the microcode from loader, Specifically, I have this in /boot/loader.conf: cpu_microcode_load="YES" cpu_microcode_name="/boot/firmware/intel-ucode.bin" > or from a rc.d service. Updating the CPU microcode _after_ the kernel has started seems questionable. -- Christian "naddy" Weisgerber naddy@mips.inka.de