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

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Message-ID: <20160809095058.GA6618@gondor.apana.org.au>
Date:	Tue, 9 Aug 2016 17:50:58 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Keith Packard <keithp@...thp.com>
Cc:	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwrng: core - Allow for multiple simultaneous active
 hwrng devices

On Mon, Jul 25, 2016 at 01:07:35PM -0700, Keith Packard wrote:
> Instead of having only one hwrng feeding /dev/random at a time, maintain
> a list of devices and cycle between them when filling the entropy pool.
> 
> Signed-off-by: Keith Packard <keithp@...thp.com>

So you're cycling RNGs even for user-space reads? That could be
problematic because not all hardware RNGs carry the maximum amount
of entropy.  It would be rather annoying to be cycling between
RNGs of different qualities.

Perhaps only cycle for the kernel hwrngd?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt