linux-kernel - Re: [PATCH 0/2] Add support for Qualcomm's PRNG

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Message-ID: <5257A320.1070207@ladisch.de>
Date:	Fri, 11 Oct 2013 09:05:04 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Stanimir Varbanov <svarbanov@...sol.com>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	Theodore Ts'o <tytso@....edu>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Matt Mackall <mpm@...enic.com>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	linux-kernel@...r.kernel.org, Rob Landley <rob@...dley.net>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 0/2] Add support for Qualcomm's PRNG

Stanimir Varbanov wrote:
> I ran the rngtest with following command line:
>
> # cat /dev/hw_random | rngtest -c 100000
> ...
> rngtest: bits received from input: 2000000032
> rngtest: FIPS 140-2 successes: 99925
> rngtest: FIPS 140-2 failures: 75
> ...
>
> Could you guys comment those results?

These tests are expected to fail a few times even for perfectly random
data (think monkeys/Shakespeare).  An entropy source will be permanently
disabled by rngd only if the failure ratio is worse than 1 in 1000.


Regards,
Clemens
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