linux-kernel - Re: [PATCH] Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE

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Date:	Sat, 17 May 2008 12:54:02 -0700
From:	"Chris Peterson" <cpeterso@...terso.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"Herbert Xu" <herbert@...dor.apana.org.au>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Jeff Garzik" <jeff@...zik.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	tpmdd-devel@...ts.sourceforge.net, tpm@...horst.net
Subject: Re: [PATCH] Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE_RANDOM

> Would people be ok with kernel auto-feeding for /dev/urandom only? I've
> been pondering that and I think that would work just as well in practice
>  given the facts above. Then you would still only get blocking
> /dev/random with the user daemon, but that won't matter because all
> the usual users don't rely on thatanyways.

Andi, can you please clarify what you mean by "auto-feeding
/dev/urandom only" and "only get blocking /dev/random with the user
daemon"? Are you suggesting that the kernel provides /dev/urandom and
a userspace daemon (e.g. EGD) provides /dev/random?

Also, if crypto apps like ssh and openssl use on "insecure"
/dev/urandom, then who actually relies on /dev/random? For comparison,
FreeBSD does not even (AFAIK) have /dev/urandom. FreeBSD's /dev/random
is nonblocking (like Linux's /dev/urandom) and includes network
entropy.

chris
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