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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8BBF8C54EE9 for ; Tue, 20 Sep 2022 22:52:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230264AbiITWwk (ORCPT ); Tue, 20 Sep 2022 18:52:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35720 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230237AbiITWwe (ORCPT ); Tue, 20 Sep 2022 18:52:34 -0400 Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F04D71BD8 for ; Tue, 20 Sep 2022 15:52:33 -0700 (PDT) Received: by mail-pl1-x62d.google.com with SMTP id p18so3862273plr.8 for ; Tue, 20 Sep 2022 15:52:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date; bh=csHCOpX4Thr2QRrHr400VPFVzlVPJ8/efH6qq4nAHXc=; b=aDBP4/2lo+pXphddlVIa2FTCAzhZ91faxjotdaCnJaSpL/aaDEkohKi/G9sUhhvB5s KMUGnoXYj3i89qIOkEuj5X5q6NGMUXkkTwKWrVXeRs3yHmNL7JiWxSIoTavOqdn9DmtZ WrROCn/b2HS8AyqdqV4GgA4eGe+8jr7IfQMaE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date; bh=csHCOpX4Thr2QRrHr400VPFVzlVPJ8/efH6qq4nAHXc=; b=wexnrkrgXMhUHT9mx/t0mwCOqYacjd9icu4MJI5gbztapxqylUG0TSq0r59ny9W3Fe 0VIqLwvH5e+n2I3TTtHDyny94NKraT3WmkbZbSy16cdUgiZh/eLnzbVfHkIMr+eLC0/4 HSpqAb6WWqVkAYePkyofRyQWXGR8fqBQpi+owcgOd/MWcS11g8m6y63CxoIdvRxQbuO1 IBXwxFvJbWZissEJsYll4R24G9U60LCEjisUVbJyaGFGMrw2kj8CujMbAZZ3r4PtjoMn Ktx3GsvI6mmVdKcrEzHxKbZUTTG6hUU98cvLWqLQtyPTJPLVNJXynoIPZh3ciBMX2Zgp R5Gw== X-Gm-Message-State: ACrzQf1A8fpQpadhysqFj5TOLFXWUZbsLTyCmMd7xNEq5YwOWmyX9GyZ JBkYVAH8/IUPgZFC3yN47sUaXA== X-Google-Smtp-Source: AMsMyM5f+/GVDaMh8mBt+g8Z2/ClIUN5JBPSQy1AM58w9hhHp0b6WHVvMFj25tmNNs2JJPVMGUhEFQ== X-Received: by 2002:a17:902:f683:b0:176:cc02:ce83 with SMTP id l3-20020a170902f68300b00176cc02ce83mr1802714plg.88.1663714352678; Tue, 20 Sep 2022 15:52:32 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id f13-20020a170902ce8d00b0016dc6279ab7sm421363plg.149.2022.09.20.15.52.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Sep 2022 15:52:31 -0700 (PDT) Date: Tue, 20 Sep 2022 15:52:30 -0700 From: Kees Cook To: Evan Green Cc: linux-kernel@vger.kernel.org, gwendal@chromium.org, Eric Biggers , Matthew Garrett , jarkko@kernel.org, zohar@linux.ibm.com, linux-integrity@vger.kernel.org, Pavel Machek , apronin@chromium.org, dlunev@google.com, rjw@rjwysocki.net, linux-pm@vger.kernel.org, corbet@lwn.net, jejb@linux.ibm.com, David Howells , Hao Wu , James Morris , Jason Gunthorpe , Len Brown , Matthew Garrett , Paul Moore , Peter Huewe , "Rafael J. Wysocki" , "Serge E. Hallyn" , axelj , keyrings@vger.kernel.org, linux-doc@vger.kernel.org, linux-security-module@vger.kernel.org Subject: Re: [PATCH v2 00/10] Encrypted Hibernation Message-ID: <202209201550.D2F47108@keescook> References: <20220823222526.1524851-1-evgreen@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220823222526.1524851-1-evgreen@chromium.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 23, 2022 at 03:25:16PM -0700, Evan Green wrote: > This series adopts that primitive as a foundation, tweaking and building > on it a bit. Where Matthew's series used the TPM-backed key to encrypt a > hash of the image, this series uses the key directly as a gcm(aes) > encryption key, which the kernel uses to encrypt and decrypt the > hibernate image in chunks of 16 pages. This provides both encryption and > integrity, which turns out to be a noticeable performance improvement over > separate passes for encryption and hashing. I like this series! I would ask that someone more familiar with the cryptographic constraints here confirm that the primitives you're using are going to actually provide you the constraints you want (i.e. encryption, integrity, etc). My understanding is that gcm(aes) is exactly right, but I Am Not A Cryptographer. ;) I'll reply more to individual patches ... -- Kees Cook