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

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Message-ID: <20140207074436.GA11178@logfs.org>
Date:	Fri, 7 Feb 2014 02:44:36 -0500
From:	Jörn Engel <joern@...fs.org>
To:	Kees Cook <kees@...flux.net>
Cc:	Theodore Ts'o <tytso@....edu>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	macro@...ux-mips.org, ralf@...ux-mips.org, dave.taht@...il.com,
	blogic@...nwrt.org, andrewmcgr@...il.com, smueller@...onox.de,
	geert@...ux-m68k.org, tg@...bsd.de
Subject: Re: [PATCH,RFC] random: collect cpu randomness

On Thu, 6 February 2014 14:20:02 -0800, Kees Cook wrote:
> On Sun, Feb 02, 2014 at 03:36:17PM -0500, Jörn Engel wrote:
> > Collects entropy from random behaviour all modern cpus exhibit.  The
> > scheduler and slab allocator are instrumented for this purpose.  How
> > much randomness can be gathered is clearly hardware-dependent and hard
> > to estimate.  Therefore the entropy estimate is zero, but random bits
> > still get mixed into the pools.
> 
> Have you seen this work from PaX Team?
> 
> http://grsecurity.net/pipermail/grsecurity/2012-July/001093.html

Interesting.

> See http://grsecurity.net/test/grsecurity-3.0-3.13.1-201402052349.patch
> and search for PAX_LATENT_ENTROPY.

Server gives me an error.  Archive.org doesn't have a copy either,
thanks to robots.txt.

Can you send me a copy via mail?

Jörn

--
Functionality is an asset, but code is a liability.
--Ted Dziuba
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