linux-kernel - Re: [PATCH v25 12/12] LRNG - add interface for gathering of raw entropy

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Date:   Tue, 19 Nov 2019 09:17:55 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Stephan Müller <smueller@...onox.de>,
        Arnd Bergmann <arnd@...db.de>
Cc:     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>,
        "Alexander E. Patrakov" <patrakov@...il.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 v25 12/12] LRNG - add interface for gathering of raw
 entropy

Hi,

On 11/16/19 1:38 AM, Stephan Müller wrote:
> diff --git a/drivers/char/lrng/Kconfig b/drivers/char/lrng/Kconfig
> index e6ca3acc1e48..4ccc710832ef 100644
> --- a/drivers/char/lrng/Kconfig
> +++ b/drivers/char/lrng/Kconfig
> @@ -169,4 +169,20 @@ config LRNG_APT_CUTOFF
>  	default 325 if !LRNG_APT_BROKEN
>  	default 32 if LRNG_APT_BROKEN
>  
> +config LRNG_TESTING
> +	bool "Enable entropy test interface to LRNG noise source"
> +	select CONFIG_DEBUG_FS

	That should be spelled as DEBUG_FS and preferably would be "depends on"
	instead of 'select'.


> +	help
> +	  The test interface allows a privileged process to capture
> +	  the raw unconditioned noise that is collected by the LRNG
> +	  for statistical analysis. Extracted noise data is not used
> +	  to seed the LRNG.
> +
> +	  The raw noise data can be obtained using the lrng_raw
> +	  debugfs file. Using the option lrng_testing.boot_test=1
> +	  the raw noise of the first 1000 entropy events since boot
> +	  can be sampled.
> +
> +	  If unsure, say N.
> +
>  endif # LRNG

thanks.
-- 
~Randy