linux-kernel - Re: [RFC/PATCH 0/3] Add devicetree scanning for randomness

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Message-ID: <CAMuHMdW7S=o4oHVsNtYo0i_giB5cgWhygo-GgSaA1Kur6m3vng@mail.gmail.com>
Date:	Mon, 17 Feb 2014 22:07:50 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jason Cooper <jason@...edaemon.net>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Grant Likely <grant.likely@...aro.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Laura Abbott <lauraa@...eaurora.org>,
	Kees Cook <keescook@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [RFC/PATCH 0/3] Add devicetree scanning for randomness

On Mon, Feb 17, 2014 at 7:23 PM, Jason Cooper <jason@...edaemon.net> wrote:
>> Could we use a faster hash function that scans the entire device tree and
>> then just feed the output of that into add_device_randomness? We probably
>> can't expect that there is a lot of entropy in the DT blob, so the
>> result wouldn't be all that different in terms of quality of the random
>> seed.
>
> I think it would be easier to identify the few attributes that differ
> from board to board (mac address, serial number, etc), and differ from
> boot to boot (random-seed, timestamp) and just extract and feed those
> in.

Isn't identifying those (mostly) a manual process?
Calculating a fast hash is fully automatic.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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