From: Kees Cook <kees@outflux.net>
To: "Jörn Engel" <joern@logfs.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>, "H. Peter Anvin" <hpa@zytor.com>,
Linux Kernel Developers List <linux-kernel@vger.kernel.org>,
macro@linux-mips.org, ralf@linux-mips.org, dave.taht@gmail.com,
blogic@openwrt.org, andrewmcgr@gmail.com, smueller@chronox.de,
geert@linux-m68k.org, tg@mirbsd.de
Subject: Re: [PATCH,RFC] random: collect cpu randomness
Date: Thu, 6 Feb 2014 14:20:02 -0800 [thread overview]
Message-ID: <20140206222002.GC23300@outflux.net> (raw)
In-Reply-To: <20140202203617.GA9499@logfs.org>
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.
-Kees
--
Kees Cook @outflux.net
next prev parent reply other threads:[~2014-02-06 22:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-02 20:36 [PATCH,RFC] random: collect cpu randomness Jörn Engel
2014-02-02 21:25 ` Stephan Mueller
2014-02-03 1:24 ` Jörn Engel
2014-02-03 1:28 ` H. Peter Anvin
2014-02-03 13:36 ` Stephan Mueller
2014-02-03 1:39 ` Theodore Ts'o
2014-02-03 3:35 ` Jörn Engel
2014-02-03 12:54 ` Thorsten Glaser
2014-02-03 13:06 ` Stephan Mueller
2014-02-03 15:50 ` Jörn Engel
2014-02-03 16:37 ` Theodore Ts'o
2014-02-03 18:48 ` Jörn Engel
2014-03-23 18:00 ` [PATCH] random: mix all saved registers into entropy pool Jörn Engel
2014-02-03 21:54 ` [PATCH,RFC] random: collect cpu randomness Maciej W. Rozycki
2014-02-03 22:44 ` Theodore Ts'o
2014-02-06 22:20 ` Kees Cook [this message]
2014-02-06 22:21 ` Dave Taht
2014-02-07 7:44 ` Jörn Engel
2014-02-20 9:50 ` Paolo Bonzini
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