From nobody Thu Aug 10 05:26:32 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 4RLwQM3QqLz4q6rg for ; Thu, 10 Aug 2023 05:26:35 +0000 (UTC) (envelope-from grarpamp@gmail.com) Received: from mail-vs1-xe29.google.com (mail-vs1-xe29.google.com [IPv6:2607:f8b0:4864:20::e29]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4RLwQL3sZlz3c1V for ; Thu, 10 Aug 2023 05:26:34 +0000 (UTC) (envelope-from grarpamp@gmail.com) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20221208 header.b=NiT1Jxck; spf=pass (mx1.freebsd.org: domain of grarpamp@gmail.com designates 2607:f8b0:4864:20::e29 as permitted sender) smtp.mailfrom=grarpamp@gmail.com; dmarc=pass (policy=none) header.from=gmail.com Received: by mail-vs1-xe29.google.com with SMTP id ada2fe7eead31-4475df91bb1so230154137.3 for ; Wed, 09 Aug 2023 22:26:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1691645193; x=1692249993; h=to:subject:message-id:date:from:references:in-reply-to:mime-version :from:to:cc:subject:date:message-id:reply-to; bh=bDVkavpcSHM4ySsb7A6RGAYA2SQIPxg3UNKInYe1Kl0=; b=NiT1JxcknZEw2HJDlPaCZfe5aIj6b0N9VFzZ8HfINVyUb3ckjBUo48JRNZBOy3qT5/ h6eFnRzQXOZKByoaZxEwBTs+ZL60NcUDWSbgWwFNcVY4mTiNxCNzT7d2r4tm9sDQHkND a+86Ed6Sh78cgjR3h93Kx5BBhi3+/3n7ItsjOYdBWjYbPuilGNTy5yxJCF4rpgBXi8AR Xw24KLs6mXzkGGwOFTJKlwpnY4PxiG1I5frRZktEy0iTkC8vbMIqy5n7RG5GAJrp0x6L YRx6tZWmly4parnLYSvBUDwrA1E17hipJ62+yRA9wlEwbpaFywsglwsikfXqpt40+oiY /+oA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691645193; x=1692249993; h=to:subject:message-id:date:from:references:in-reply-to:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=bDVkavpcSHM4ySsb7A6RGAYA2SQIPxg3UNKInYe1Kl0=; b=HLVjoCxyVDN+yhqTsiKZTO5oLi0ORUEOtiPLdA1jHFILSyAk3AOH0eSqjGJw4YHGWy kUgDFDzS5l25Y4CgM6osJwHF23spHJhMUCL5TzavZPMS5ls785MrViY2i2ghWjUeSt9j OeJURw6EhOo74Dl83cfQuSpi/XEpuTs5mCWPjl6YcsFqODvh8VUcPKDV1IeK22+Cb5hk Clc3FBM/ibhSgVS2RgVfOXgKjLl55lGR3h/DP14St94l7wzWForEc8g3e/aRXO+xGHmF GxPORp6EL2olvNzs2ktLU2fWopEzvEAW6kILUikHPZ2CcykgidP5vlLau1dIK7VpgoAO VGHA== X-Gm-Message-State: AOJu0Ywr2Vt4wnRYUz3cliKaheUaMjeEsNImJDuTk/fx3LX8eo7xFI2J Uk1xAHG8rfzLW1gEQOwVJAIOtNRKZWY/+CQtCGYfArfP+Qcq4PHt X-Google-Smtp-Source: AGHT+IFak3S9ozXl+qojGWVvJZ/BAlK/EQzGK2345+k7nBFVCc6o8R9w3+4d9QOxVfNZ3HFD0kXBuyd659hfd/th670= X-Received: by 2002:a67:d00a:0:b0:443:69fd:3628 with SMTP id r10-20020a67d00a000000b0044369fd3628mr926155vsi.13.1691645193385; Wed, 09 Aug 2023 22:26:33 -0700 (PDT) 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 Received: by 2002:a59:b907:0:b0:3ed:209f:4d2d with HTTP; Wed, 9 Aug 2023 22:26:32 -0700 (PDT) In-Reply-To: References: <189d93e0238.2805.fa4b1493b064008fe79f0f905b8e5741@Leidinger.net> From: grarpamp Date: Thu, 10 Aug 2023 01:26:32 -0400 Message-ID: Subject: Re: Downfall microcode update To: freebsd-security@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Spamd-Result: default: False [-2.69 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.96)[-0.962]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_SPAM_MEDIUM(0.27)[0.274]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20221208]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; MIME_GOOD(-0.10)[text/plain]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::e29:from]; RCVD_TLS_LAST(0.00)[]; MLMMJ_DEST(0.00)[freebsd-security@freebsd.org]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FREEMAIL_ENVFROM(0.00)[gmail.com]; DKIM_TRACE(0.00)[gmail.com:+]; MID_RHS_MATCH_FROMTLD(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FREEMAIL_FROM(0.00)[gmail.com]; PREVIOUSLY_DELIVERED(0.00)[freebsd-security@freebsd.org]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_NONE(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim] X-Spamd-Bar: -- X-Rspamd-Queue-Id: 4RLwQL3sZlz3c1V > Updating the CPU microcode _after_ the kernel has started Kernel does lot of stuff "after it starts" running, after it gets loaded, before userland, so really your note means next possible place to "updating" is after kernel hands off to init. > seems questionable. Yes it's supposed to go in from bios before executing any other code (ie from disk). So unless you able to rebuild your own bios images on old boards whose makers are too lame to support updates from upstream cpu vendor, then the next earliest and thus most correct way is have loader load it into cpu first... in case kernel does use the cpu ops that the ucode modifies. The rc way could be there for easier config switch from bad ucode in single user mode. At least Intel has revoked at least one ucode for problems before, but probably not yet for one that locked up anyone's basic kernel load, boot, or user shell. So rc kindof doesn't need to exist given loader way, and that reboot repair methods still exist. > cron From the HW vendors cpu repos could work, no need to hammer fbsd site for that, but a bit overkill unless you're a shared hosting service, the big guys get advance notice anyway. Nor is anyone sane doing cron fetch and installworld to apply new code either like that.