Re: [kernel-hardening] [PATCH v7 0/9] x86/mm: memory area address KASLR

[Kees Cook]

On Thu, Jun 23, 2016 at 12:45 PM, Sandy Harris <sandyinchina@xxxxxxxxx> wrote:
> Jason Cooper <jason@xxxxxxxxxxxxxx> 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