netdev - Re: [PATCH] random: seed random_int_secret at least poorly at core

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: <CAGXu5j+emFS+Y-=SOE4SM_gAXfR_NWHRXwv8c6CeB7SgGZgKNw@mail.gmail.com>
Date:	Fri, 15 Nov 2013 11:07:35 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Dave Jones <davej@...hat.com>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	Daniel Borkmann <dborkman@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Florian Weimer <fweimer@...hat.com>, netdev@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-wireless@...r.kernel.org
Subject: Re: [PATCH] random: seed random_int_secret at least poorly at
 core_initcall time

On Fri, Nov 15, 2013 at 10:45 AM, Dave Jones <davej@...hat.com> wrote:
> On Fri, Nov 15, 2013 at 10:33:04AM -0800, Kees Cook wrote:
>
>  > Ingo wanted even more
>  > unpredictability, in the face of total failure from these more dynamic
>  > sources, so x86 also "seeds" itself with the build string and the
>  > boot_params. These last two are hardly high entropy, but they should
>  > at least make 2 different systems not have _identical_ entropy at the
>  > start. It's far from cryptographically secure, but it's something, I
>  > hope.
>
> Those are both likely to be the same on some configurations.
> On x86, we could maybe hash the dmi tables ? Vendor stupidity aside,
> things like serial numbers in those tables _should_ be different.

Yeah, DMI tables were suggested as well. (Hopefully people will start
using -uuid with KVM!) How hard would that be to hook up to the
pre-random-init code?

-Kees

-- 
Kees Cook
Chrome OS Security
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html