linux-kernel - Re: [PATCH] nvmem: sunxi-sid: SID content is not a valid source of randomness

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20161024201020.h6akyqad2o42xkhq@lukather>
Date:   Mon, 24 Oct 2016 22:10:20 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     srinivas.kandagatla@...aro.org, wens@...e.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH] nvmem: sunxi-sid: SID content is not a valid source of
 randomness

On Sat, Oct 22, 2016 at 03:53:28PM +0200, Corentin Labbe wrote:
> Since SID's content is constant over reboot,

That's not true, at least not across all the Allwinner SoCs, and
especially not on the A10 and A20 that this driver supports.

> it must not be used as source of randomness.

And I don't think that's true either. A constant entropy provider will
not add any entropy, but will not remove any, would it?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Download attachment "signature.asc" of type "application/pgp-signature" (802 bytes)