From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8336EC4CEC9 for ; Wed, 18 Sep 2019 10:26:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 43628205F4 for ; Wed, 18 Sep 2019 10:26:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Zgd5nsMV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729564AbfIRK0A (ORCPT ); Wed, 18 Sep 2019 06:26:00 -0400 Received: from mail-wr1-f67.google.com ([209.85.221.67]:45436 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725298AbfIRKZ7 (ORCPT ); Wed, 18 Sep 2019 06:25:59 -0400 Received: by mail-wr1-f67.google.com with SMTP id r5so6242821wrm.12; Wed, 18 Sep 2019 03:25:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to; bh=Oyd8Hl2TY17u78mi8mNrd648PLaqo+SFT6fX6+uNzS4=; b=Zgd5nsMVM00AEmShsLScPRxS1oVBUrHqys69xkfARStMDKuKp/lha6/l79hfXib0w5 nab0MPmXZlwx3AtORsgPpcCEkGfh5Lkvi7S/+cFQ8V8UHmpCwVQO2P2v2gaONEDosEy3 OQ++bzzsZtSOKGfUc3qW0hRT7D4oB3GmJ/na9K1bbkG5j8bQvc6LdQ86yxG20DJFh3/o X4QzcZUNys5a+ERkyXeuPlq633bbj2GNKDbyYkCFOAqj0roeKcm4zWXKbtnXtleCOvQJ uxbb4i6f7Rr9Kc/ovavsB+GGh73HJAVRgvPl97j7DASWWh+7zvwCJCA+Mg3kBnOLQldc Bfdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to; bh=Oyd8Hl2TY17u78mi8mNrd648PLaqo+SFT6fX6+uNzS4=; b=fBArV88+DLioVr7G+w79nLJArkk06fhdS/cHDA6jAZWa93cGtHSnn9gXbnWBe+0lur rrEGfA+Efk+GUPZTmwFS0AUCUNSdupoJnBa44SBcKIdb9EW3oe/mcA9ZZZS9whLtKN2M MqRFDLMr6VLeztMp3HxD2+dLr2ZYii+2QKEP6dz8vUsQzLFpzqDLCE8MkPefX6n8TP8m nx2qw5TcSS0gl9+d2+YplamBLKrWMdVGq6ohH1MpCkaX8AvA9PJs8K6z6cn8G5swuU1L qKAnJ1Hno4hYdP++8p/GWFEZslkkrcCGl4WkgXhYTyt6HuCTooMfxzSVKjr2gXPr/Ydz 72MQ== X-Gm-Message-State: APjAAAVF/fkdv07kZWFPQCXYzTuCssBhs4NohzdBtXfah5qRtg0SGzvk rgSGbbz2MDxzy6LEa39WEv5LcD36P2rnWF9s X-Google-Smtp-Source: APXvYqz6O+1bBx9Pem6tQxchoQGtpr2RwIbHK7PVdSx6/v/hl/KxG1NVu6SZoT/GRzExdpH7unJjAw== X-Received: by 2002:a5d:4647:: with SMTP id j7mr2388690wrs.106.1568802355988; Wed, 18 Sep 2019 03:25:55 -0700 (PDT) Received: from ?IPv6:2a02:200:301a:5:438:b21e:5369:b7fd? ([2a02:200:301a:5:438:b21e:5369:b7fd]) by smtp.googlemail.com with ESMTPSA id j1sm7938869wrg.24.2019.09.18.03.25.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Sep 2019 03:25:55 -0700 (PDT) Subject: Re: Linux 5.3-rc8 To: Willy Tarreau , Rasmus Villemoes Cc: Linus Torvalds , Lennart Poettering , "Ahmed S. Darwish" , "Theodore Y. Ts'o" , Matthew Garrett , Vito Caputo , Andreas Dilger , Jan Kara , Ray Strode , William Jon McCann , zhangjs , linux-ext4@vger.kernel.org, lkml References: <20190917052438.GA26923@1wt.eu> <2508489.jOnZlRuxVn@merkaba> <20190917121156.GC6762@mit.edu> <20190917123015.sirlkvy335crozmj@debian-stretch-darwi.lab.linutronix.de> <20190917160844.GC31567@gardel-login> <20190917174219.GD31798@gardel-login> <89aeae9d-0bca-2a59-5ce2-1e18f6479936@rasmusvillemoes.dk> <20190918101616.GA29565@1wt.eu> From: "Alexander E. Patrakov" Message-ID: <2c5a27b5-66cb-269a-547d-5584d51337bb@gmail.com> Date: Wed, 18 Sep 2019 15:25:51 +0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0 MIME-Version: 1.0 In-Reply-To: <20190918101616.GA29565@1wt.eu> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms050802010801000607060005" Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms050802010801000607060005 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-PH Content-Transfer-Encoding: quoted-printable 18.09.2019 15:16, Willy Tarreau =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > We've already discussed that point a few times. The issue is that > bootloaders and/or BIOSes tend to wipe everything. Ideally we should > let the boot loader collect entropy from the DDR training phase since > it's a period where noise is observed. It's also the right moment to > collect some random contents that may lie in the RAM cells. >=20 > Similarly asynchronous clocks driving external components can be used > as well if you can measure their phase with the CPU's clock. This does not correspond to my own observations. I have a setup where a=20 secondary key is saved into RAM for unlocking a LUKS container after a=20 reboot. It is documented by me (sorry, in Russian only) here:=20 https://habr.com/ru/post/457396/ , will publish an English translation=20 in my blog if I get at least one request (in private email, please). The results so far are: 1. Desktop with MSI Z87I board: works. 2. Lenovo Yoga 2 Pro laptop: works. 3. Server based on the Intel Corporation S1200SPL board (available from=20 OVH as EG-32): does not work, memory is cleared. 4. Cheap server based on Gooxi G1SCN-B board (the cheapes thing with=20 IPMI available on bacloud.com): works. So that's 75% of success stories (found at least one page that is=20 preserved after the "reboot" command) based on my samples. --=20 Alexander E. 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