linux-kernel - Re: [PATCH v24 11/12] LRNG - add SP800-90B compliant health tests

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Date:   Wed, 13 Nov 2019 01:36:22 +0100
From:   Stephan Müller <smueller@...onox.de>
To:     "Alexander E. Patrakov" <patrakov@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Ahmed S. Darwish" <darwish.07@...il.com>,
        "Theodore Y. Ts'o" <tytso@....edu>, Willy Tarreau <w@....eu>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Vito Caputo <vcaputo@...garu.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.cz>, Ray Strode <rstrode@...hat.com>,
        William Jon McCann <mccann@....edu>,
        zhangjs <zachary@...shancloud.com>,
        Andy Lutomirski <luto@...nel.org>,
        Florian Weimer <fweimer@...hat.com>,
        Lennart Poettering <mzxreary@...inter.de>,
        Nicolai Stange <nstange@...e.de>,
        "Peter, Matthias" <matthias.peter@....bund.de>,
        Marcelo Henrique Cerri <marcelo.cerri@...onical.com>,
        Roman Drahtmueller <draht@...altsekun.de>,
        Neil Horman <nhorman@...hat.com>
Subject: Re: [PATCH v24 11/12] LRNG - add SP800-90B compliant health tests

Am Dienstag, 12. November 2019, 20:58:32 CET schrieb Alexander E. Patrakov:

Hi Alexander,
 
> > +config LRNG_HEALTH_TESTS
> > +	bool "Enable noise source online health tests"
> > +	help
> > +	  The online health tests validate the noise source at
> > +	  runtime for fatal errors. These tests include SP800-90B
> > +	  compliant tests which are invoked if the system is booted
> > +	  with fips=1. In case of fatal errors during active
> > +	  SP800-90B tests, the issue is logged and the noise
> > +	  data is discarded. These tests are required for full
> > +	  compliance with SP800-90B.
> 
> How have you tested that these tests work at runtime? Maybe add some
> code under a new CONFIG item that depends on CONFIG_BROKEN that
> deliberately botches the RNG and triggers failures?


I am unable to find sensible information about CONFIG_BROKEN in the recent 
kernel tree. 

Do you happen to have a pointer on how that option is to be used?

Thanks a lot

Ciao
Stephan