linux-kernel - Re: [PATCH,RFC] random: collect cpu randomness

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Message-ID: <20140203224438.GD22856@thunk.org>
Date:	Mon, 3 Feb 2014 17:44:38 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	Jörn Engel <joern@...fs.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>, dave.taht@...il.com,
	blogic@...nwrt.org, andrewmcgr@...il.com, smueller@...onox.de,
	Geert Uytterhoeven <geert@...ux-m68k.org>, tg@...bsd.de
Subject: Re: [PATCH,RFC] random: collect cpu randomness

On Mon, Feb 03, 2014 at 09:54:22PM +0000, Maciej W. Rozycki wrote:
> 
>  Can we be sure we don't leak information this way?  Just being 
> paranoid...

The register information will be mixed pretty thoroughly by the time
it gets to the entropy pool, and then we don't ever expose the entropy
pool to userspace.  So no, I don't think we need to worry about
leaking information.

					- Ted
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