From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1751867AbbFXIqB (ORCPT <rfc822;w@1wt.eu>);
	Wed, 24 Jun 2015 04:46:01 -0400
Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:44551 "EHLO
	atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750800AbbFXIpw (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 24 Jun 2015 04:45:52 -0400
Date: Wed, 24 Jun 2015 10:45:50 +0200
From: Pavel Machek <pavel@ucw.cz>
To: Stephan Mueller <smueller@chronox.de>
Cc: Ted Tso <tytso@mit.edu>, linux-crypto@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] random: add random_initialized command line param
Message-ID: <20150624084550.GB22179@amd>
References: <4206400.x843ypJTc1@tachyon.chronox.de>
 <20150623204411.GB30826@amd>
 <3810058.lSGD55uyzM@myon.chronox.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <3810058.lSGD55uyzM@myon.chronox.de>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue 2015-06-23 23:47:33, Stephan Mueller wrote:
> Am Dienstag, 23. Juni 2015, 22:44:11 schrieb Pavel Machek:
> 
> Hi Pavel,
> 
> > On Mon 2015-05-18 18:25:25, Stephan Mueller wrote:
> > > Make the threshold at which the output entropy pools are considered to
> > > be initialized configurable via a kernel command line option. The
> > > current integer value of 128 bits is a good default value. However, some
> > > user groups may want to use different values. For example, the SOGIS
> > > group now requires 125 bits at least (BSI, the participant at that group
> > > used to require 100 bits). NIST moved from 80 bits to 112 bits starting
> > > with 2014.
> > > 
> > > It is therefore to be expected that in the future, this threshold may
> > > increase for different user groups.
> > 
> > Speaking of random and kernel parameters... should we add random=<hex
> > digits> parameter to pass entropy from bootloader to the kernel?
> 
> Everybody can see that string. How do you think that way of providing entropy 
> is protected?

Only local users, not remote attackers. And yes, we should probably
"censor" the command line for this use.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html