linux-kernel - [PATCH v3 00/03]: hwrng: an in-kernel rngd

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Message-ID: <20140414160211.GE711@lst.de>
Date:	Mon, 14 Apr 2014 18:02:11 +0200
From:	Torsten Duwe <duwe@....de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Theodore Ts'o <tytso@....edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Arnd Bergmann <arnd@...db.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Satoru Takeuchi <satoru.takeuchi@...il.com>,
	ingo.tuchscherer@...ibm.com, linux-kernel@...r.kernel.org,
	Hans-Georg Markgraf <MGRF@...ibm.com>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Joe Perches <joe@...ches.com>
Subject: [PATCH v3 00/03]: hwrng: an in-kernel rngd

More or less a resend of v2.

On Wed, Mar 26, 2014 at 06:03:37PM -0700, H. Peter Anvin wrote:
> I'm wondering more about the default.  We default to 50% for arch_get_random_seed, and this is supposed to be the default for in effect unverified hwrngs...

Done. 50% is now the default, that's the only change from v2.

Andy: the printk you pointed out already limits itself to 1/10s,
which is half the default rate limit. Also, as Peter already
wrote, we're dealing with true HWRNGs here; if such a device
does not produce a single byte within 10 seconds something _is_
severely broken and, like a dying disk, worth to be logged.
Here's one of the better circuits I found:
http://www.maximintegrated.com/app-notes/index.mvp/id/3469
or offline:
http://pdfserv.maximintegrated.com/en/an/AN3469.pdf
Disclaimer: I'm not endorsing Maxim, it's just that paper
that hits the spot IMHO.

Anything wrong with feeding those bits into the input pool?
Any other comments on the code?

	Torsten

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