From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936277AbdADNEx (ORCPT ); Wed, 4 Jan 2017 08:04:53 -0500 Received: from mga03.intel.com ([134.134.136.65]:24112 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753551AbdADNEm (ORCPT ); Wed, 4 Jan 2017 08:04:42 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,459,1477983600"; d="scan'208";a="1089788784" Date: Wed, 4 Jan 2017 15:01:18 +0200 From: Jarkko Sakkinen To: Nayna Cc: tpmdd-devel@lists.sourceforge.net, peterhuewe@gmx.de, tpmdd@selhorst.net, jgunthorpe@obsidianresearch.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 2/2] tpm: add securityfs support for TPM 2.0 firmware event log Message-ID: <20170104130118.2brkojj65vjhzca3@intel.com> References: <1481434533-3453-1-git-send-email-nayna@linux.vnet.ibm.com> <1481434533-3453-3-git-send-email-nayna@linux.vnet.ibm.com> <20170102221148.gy3mlubrgs4gm6ey@intel.com> <586B5526.9090703@linux.vnet.ibm.com> <20170103133309.lt5k4c37rjq5vcbq@intel.com> <586CB46E.8050207@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <586CB46E.8050207@linux.vnet.ibm.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo User-Agent: Mutt/1.6.2-neo (2016-08-21) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 04, 2017 at 02:08:06PM +0530, Nayna wrote: > > > On 01/03/2017 07:03 PM, Jarkko Sakkinen wrote: > > On Tue, Jan 03, 2017 at 01:09:18PM +0530, Nayna wrote: > > > > > > > > > On 01/03/2017 03:42 AM, Jarkko Sakkinen wrote: > > > > On Sun, Dec 11, 2016 at 12:35:33AM -0500, Nayna Jain wrote: > > > > > Unlike the device driver support for TPM 1.2, the TPM 2.0 does > > > > > not support the securityfs pseudo files for displaying the > > > > > firmware event log. > > > > > > > > > > This patch enables support for providing the TPM 2.0 event log in > > > > > binary form. TPM 2.0 event log supports a crypto agile format that > > > > > records multiple digests, which is different from TPM 1.2. This > > > > > patch enables the tpm_bios_log_setup for TPM 2.0 and adds the > > > > > event log parser which understand the TPM 2.0 crypto agile format. > > > > > > > > > > Signed-off-by: Nayna Jain > > > > > > > > There is something fundamentally wrong in this commit. > > > > > > > > You must not allow this feature unless CONFIG_OF is set. It is the only > > > > interface where the supply path of the event log is well defined on > > > > platforms that include a TPM 2.0 chip. > > > > > > As per current implementation, if ACPI with TPM 2.0 doesn't support event > > > log, tpm_read_log_acpi() is expected to return rc and tpm_bios_log_setup > > > will not create securityfs. This is inline with our design for TPM 1.2 event > > > log. > > > > At minimum you must have a check for TPM_CHIP_FLAG_TPM2 in the beginning > > of tpm_read_log_acpi. It is wrong to even try to open TCPA in this case. > > Sure, will add this check and return -ENODEV if check passes. Yeah, this is acceptable for me. > Thanks & Regards, > - Nayna /Jarkko