linux-kernel - Re: IRQF_SAMPLE

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Message-ID: <20090406200025.67cc558a@lxorguk.ukuu.org.uk>
Date:	Mon, 6 Apr 2009 20:00:25 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Robin Getz <rgetz@...ckfin.uclinux.org>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Chris Peterson <cpeterso@...terso.com>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: IRQF_SAMPLE_RANDOM question...

On Mon, 6 Apr 2009 14:30:26 -0400
Robin Getz <rgetz@...ckfin.uclinux.org> wrote:

> Although there was some discussion  
> http://thread.gmane.org/gmane.linux.kernel/680723
> 
> about removing IRQF_SAMPLE_RANDOM from the remaining network drivers in May of 
> 2008, but they still appears to be there in 2.6.29.

These are mostly unmaintained drivers. Dunno why tg3 isn't fixed - it has
some mitigation logic so maybe its not observable


> I can put a scope/analyser on a device - and look at the touchscreens, serial 
> devices, USB, all without cracking the case. 

But you can observe a network interface accurately from all over the lan
(and with a ten dollar card), or a good deal further (I believe up to 1Km
in the right conditions was claimed by some

If you need absolute hard entropy then use a real entropy source, if not
then your user space is using the wrong device file - the blocking for
entropy one. At that point it depends how vital your SSL is to you and
what it protects.

Alan
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