linux-kernel - Re: [PATCH] hwrng: core - Allow for multiple simultaneous active hwrng devices

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Message-ID: <86bn11r0bd.fsf@hiro.keithp.com>
Date:	Tue, 09 Aug 2016 16:26:30 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Jason Cooper <jason@...edaemon.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwrng: core - Allow for multiple simultaneous active hwrng devices

Henrique de Moraes Holschuh <hmh@....eng.br> writes:

> IMHO, this is mightly annoying to use from inside a rngd-like utility in
> a race-free, safe way.  It looks to me that ioctl() would be a much
> better interface for everything but the "enabled" functionality (which
> should be reported to the rngd-like utility as open() on the real device
> failing with, e.g., ENXIO, when that source is disabled).

What information does an rngd-like program actually want? All I can
think that it would need is the stream of random data. I guess some
estimate of the entropy available would be nice, but surely it would
want to verify that in any case.

-- 
-keith

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