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Date: Thu, 23 Jun 2016 12:59:07 -0700
From: Kees Cook <keescook@...omium.org>
To: Sandy Harris <sandyinchina@...il.com>
Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
Thomas Garnier <thgarnie@...gle.com>, Ingo Molnar <mingo@...nel.org>,
Andy Lutomirski <luto@...nel.org>, "x86@...nel.org" <x86@...nel.org>, Borislav Petkov <bp@...e.de>,
Baoquan He <bhe@...hat.com>, Yinghai Lu <yinghai@...nel.org>, Juergen Gross <jgross@...e.com>,
Matt Fleming <matt@...eblueprint.co.uk>, Toshi Kani <toshi.kani@....com>,
Andrew Morton <akpm@...ux-foundation.org>, Dan Williams <dan.j.williams@...el.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
Xiao Guangrong <guangrong.xiao@...ux.intel.com>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
Alexander Kuleshov <kuleshovmail@...il.com>, Alexander Popov <alpopov@...ecurity.com>,
Dave Young <dyoung@...hat.com>, Joerg Roedel <jroedel@...e.de>, Lv Zheng <lv.zheng@...el.com>,
Mark Salter <msalter@...hat.com>, Dmitry Vyukov <dvyukov@...gle.com>,
Stephen Smalley <sds@...ho.nsa.gov>, Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Christian Borntraeger <borntraeger@...ibm.com>, Jan Beulich <JBeulich@...e.com>,
LKML <linux-kernel@...r.kernel.org>, Jonathan Corbet <corbet@....net>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v7 0/9] x86/mm: memory area address KASLR
On Thu, Jun 23, 2016 at 12:45 PM, Sandy Harris <sandyinchina@...il.com> wrote:
> Jason Cooper <jason@...edaemon.net> wrote:
>
>> Modern systems that receive a seed from the bootloader via the
>> random-seed property (typically from the hw-rng) can mix both sources
>> for increased resilience.
>>
>> Unfortunately, I'm not very familiar with the internals of x86
>> bootstrapping. Could GRUB be scripted to do a similar task? How would
>> the address and size of the seed be passed to the kernel? command line?
>
> One suggestion is at:
> http://www.av8n.com/computer/htm/secure-random.htm#sec-boot-image
Interesting! This might pose a problem for signed images, though.
(Actually, for signed arm kernels is the DT signed too? If so, it
would be a similar problem.)
-Kees
--
Kees Cook
Chrome OS & Brillo Security
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