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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 62308C32792 for ; Thu, 3 Oct 2019 11:41:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3C42120830 for ; Thu, 3 Oct 2019 11:41:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730140AbfJCLlX (ORCPT ); Thu, 3 Oct 2019 07:41:23 -0400 Received: from mga03.intel.com ([134.134.136.65]:53112 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729820AbfJCLlX (ORCPT ); Thu, 3 Oct 2019 07:41:23 -0400 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Oct 2019 04:41:22 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,252,1566889200"; d="scan'208";a="391916973" Received: from jsakkine-mobl1.tm.intel.com (HELO localhost) ([10.237.50.161]) by fmsmga005.fm.intel.com with ESMTP; 03 Oct 2019 04:41:19 -0700 Date: Thu, 3 Oct 2019 14:41:19 +0300 From: Jarkko Sakkinen To: Mimi Zohar Cc: linux-integrity@vger.kernel.org, stable@vger.kernel.org, David Howells , Herbert Xu , "David S. Miller" , "open list:ASYMMETRIC KEYS" , "open list:CRYPTO API" , open list Subject: Re: [PATCH] KEYS: asym_tpm: Switch to get_random_bytes() Message-ID: <20191003114119.GF8933@linux.intel.com> References: <20190926171601.30404-1-jarkko.sakkinen@linux.intel.com> <1570024819.4999.119.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: <1570024819.4999.119.camel@linux.ibm.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo User-Agent: Mutt/1.10.1 (2018-07-13) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Wed, Oct 02, 2019 at 10:00:19AM -0400, Mimi Zohar wrote: > On Thu, 2019-09-26 at 20:16 +0300, Jarkko Sakkinen wrote: > > Only the kernel random pool should be used for generating random numbers. > > TPM contributes to that pool among the other sources of entropy. In here it > > is not, agreed, absolutely critical because TPM is what is trusted anyway > > but in order to remove tpm_get_random() we need to first remove all the > > call sites. > > At what point during boot is the kernel random pool available?  Does > this imply that you're planning on changing trusted keys as well? Well trusted keys *must* be changed to use it. It is not a choice because using a proprietary random number generator instead of defacto one in the kernel can be categorized as a *regression*. Also, TEE trusted keys cannot use the TPM option. If it was not initialized early enough we would need fix that too. I don't think there should be a problem anyway since encrypted keys is already using get_random_bytes(). /Jarkko