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=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham 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 8196FC282C2 for ; Wed, 13 Feb 2019 10:57:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5331520842 for ; Wed, 13 Feb 2019 10:57:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728438AbfBMK50 (ORCPT ); Wed, 13 Feb 2019 05:57:26 -0500 Received: from mga18.intel.com ([134.134.136.126]:19655 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727861AbfBMK50 (ORCPT ); Wed, 13 Feb 2019 05:57:26 -0500 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Feb 2019 02:57:26 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,365,1544515200"; d="scan'208";a="117558187" Received: from sorenthe-mobl1.ger.corp.intel.com (HELO localhost) ([10.249.254.151]) by orsmga008.jf.intel.com with ESMTP; 13 Feb 2019 02:57:22 -0800 Date: Wed, 13 Feb 2019 12:57:22 +0200 From: Jarkko Sakkinen To: Matthew Garrett Cc: linux-integrity@vger.kernel.org, peterhuewe@gmx.de, jgg@ziepe.ca, roberto.sassu@huawei.com, Matthew Garrett Subject: Re: [PATCH V3 2/4] tpm: Reserve the TPM final events table Message-ID: <20190213105722.GD7087@linux.intel.com> References: <20190211215518.81419-1-matthewgarrett@google.com> <20190211215518.81419-3-matthewgarrett@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190211215518.81419-3-matthewgarrett@google.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org On Mon, Feb 11, 2019 at 01:55:16PM -0800, Matthew Garrett wrote: > From: Matthew Garrett > > UEFI systems provide a boot services protocol for obtaining the TPM > event log, but this is unusable after ExitBootServices() is called. > Unfortunately ExitBootServices() itself triggers additional TPM events > that then can't be obtained using this protocol. The platform provides a > mechanism for the OS to obtain these events by recording them to a > separate UEFI configuration table which the OS can then map. > > Unfortunately this table isn't self describing in terms of providing its > length, so we need to parse the events inside it to figure out how long > it is. Since the table isn't mapped at this point, we need to extend the > length calculation function to be able to map the event as it goes > along. > > Signed-off-by: Matthew Garrett Reviewed-by: Jarkko Sakkinen /Jarkko