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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,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 86327C43387 for ; Thu, 3 Jan 2019 13:27:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5BEEE2073D for ; Thu, 3 Jan 2019 13:27:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730285AbfACN1n (ORCPT ); Thu, 3 Jan 2019 08:27:43 -0500 Received: from mga18.intel.com ([134.134.136.126]:51986 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730229AbfACN1m (ORCPT ); Thu, 3 Jan 2019 08:27:42 -0500 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Jan 2019 05:27:42 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,435,1539673200"; d="scan'208";a="105222390" Received: from tmuluk-mobl4.ger.corp.intel.com (HELO localhost) ([10.249.254.238]) by orsmga006.jf.intel.com with ESMTP; 03 Jan 2019 05:27:38 -0800 Date: Thu, 3 Jan 2019 15:27:37 +0200 From: Jarkko Sakkinen To: Michael =?iso-8859-1?Q?Niew=F6hner?= Cc: Mimi Zohar , James Bottomley , peterhuewe@gmx.de, jgg@ziepe.ca, arnd@arndb.de, linux-integrity@vger.kernel.org, linux-kernel , Nayna Jain , Ken Goldman Subject: Re: tpm_tis TPM2.0 not detected on cold boot Message-ID: <20190103132737.GD10491@linux.intel.com> References: <1f281756bb1f041e55be8dd090670a1a7b1d1c94.camel@mniewoehner.de> <1545519232.3940.115.camel@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: 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 Sun, Dec 23, 2018 at 12:55:12PM +0100, Michael Niewöhner wrote: > There is another issue but I don't know if both are related. Maybe that's just a > timing issue... > > root@debian:~# dd if=/dev/hwrng bs=1 count=1 > dd: error reading '/dev/hwrng': Operation not permitted > 0+0 records in > 0+0 records out > 0 bytes copied, 0.755958 s, 0.0 kB/s > root@debian:~# dd if=/dev/hwrng bs=1 count=1 | xxd; dd if=/dev/hwrng bs=1 > count=1 | xxd > dd: error reading '/dev/hwrng': Operation not permitted > 0+0 records in > 0+0 records out > 0 bytes copied, 0.755697 s, 0.0 kB/s > 1+0 records in > 1+0 records out > 00000000: 52 R > 1 byte copied, 0.0106268 s, 0.1 kB/s > > > Michael What does /sys/devices/virtual/misc/hw_random/rng_current show? Did run commands as a sanity check on my laptop and seem to work. /Jarkko