linux-kernel - Re: [PATCH 46/61] fix Intel RNG detection

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Date:	Tue, 21 Nov 2006 10:05:35 +0100
From:	Michael Buesch <mb@...sch.de>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>, torvalds@...l.org,
	akpm@...l.org, alan@...rguk.ukuu.org.uk,
	Jan Beulich <jbeulich@...ell.com>,
	Metathronius Galabant <m.galabant@...glemail.com>,
	Michael Buesch <mb@...sch.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 46/61] fix Intel RNG detection

On Tuesday 21 November 2006 00:45, Dave Jones wrote:
> On Tue, Oct 31, 2006 at 09:34:26PM -0800, Chris Wright wrote:
>  
>  > From: Jan Beulich <jbeulich@...ell.com>
>  > 
>  > [PATCH] fix Intel RNG detection
>  > 
>  > Previously, since determination whether there was an Intel random number
>  > generator was based on a single bit, on systems with a matching bridge
>  > device but without a firmware hub, there was a 50% chance that the code
>  > would incorrectly decide that the system had an RNG.  This patch adds
>  > detection of the firmware hub to better qualify the existence of an RNG.
>  > 
>  > There is one issue with the patch: I was unable to determine the LPC
>  > equivalent for the PCI bridge 8086:2430 (since the old code didn't care
>  > about which of the many devices provided by the ICH/ESB it was chose to use
>  > the PCI bridge device, but the FWH settings live in the LPC device, so the
>  > device list needed to be changed).
>  > 
>  > Signed-off-by: Jan Beulich <jbeulich@...ell.com>
>  > Signed-off-by: Michael Buesch <mb@...sch.de>
>  > Signed-off-by: Andrew Morton <akpm@...l.org>
>  > Signed-off-by: Linus Torvalds <torvalds@...l.org>
>  > Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
>  > Signed-off-by: Chris Wright <chrisw@...s-sol.org>
> 
> 
> Since I pushed an update to our Fedora users based on 2.6.18.2, a few people
> have reported they no longer have their RNG's detected.
> Here's one report: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=215144

Well, this patch should acutally fix false detections.
Did these people actually have a _working_ rng before?
I saw a report of a mac user, for which the rng disappeared. But
the previously "detected" rng didn't work either. (Work as in produces
sane random numbers). So there actually wasn't a rng available all the time.

-- 
Greetings Michael.
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