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

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Message-ID: <CAA93jw6+TS+s4DY_hJ67ZrcMMWm=9=0KjtTNBX52_pXvkOArcQ@mail.gmail.com>
Date:	Thu, 6 Feb 2014 17:21:51 -0500
From:	Dave Taht <dave.taht@...il.com>
To:	Kees Cook <kees@...flux.net>
Cc:	Jörn Engel <joern@...fs.org>,
	"Theodore Ts'o" <tytso@....edu>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	John Crispin <blogic@...nwrt.org>,
	Andrew McGregor <andrewmcgr@...il.com>,
	Stephan Mueller <smueller@...onox.de>, geert@...ux-m68k.org,
	tg@...bsd.de
Subject: Re: [PATCH,RFC] random: collect cpu randomness

On Thu, Feb 6, 2014 at 5:20 PM, Kees Cook <kees@...flux.net> wrote:
> Hi Jörn,
>
> 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
>
> See http://grsecurity.net/test/grsecurity-3.0-3.13.1-201402052349.patch
> and search for PAX_LATENT_ENTROPY.

The hardware rng world just got easier with the "hashlet".

https://plus.google.com/u/0/107942175615993706558/posts/4iq6W524SxL

Kernel driver wanted...

> -Kees
>
> --
> Kees Cook                                            @outflux.net



-- 
Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html
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