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Message-ID: <4634DB24.7020408@zytor.com>
Date: Sun, 29 Apr 2007 10:51:32 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Jeremy Fitzhardinge <jeremy@...p.org>
CC: "Eric W. Biederman" <ebiederm@...ssion.com>,
Jeff Garzik <jeff@...zik.org>, Andi Kleen <ak@...e.de>,
patches@...-64.org, Vivek Goyal <vgoyal@...ibm.com>,
linux-kernel@...r.kernel.org
Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for
relocatable bzImage
Jeremy Fitzhardinge wrote:
> Eric W. Biederman wrote:
>> All it does is set a flag that tells a bootloader.
>> "Hey. I can run when loaded a non-default address, and this is what
>> you have to align me to."
>>
>> All relocation processing happens in the kernel itself.
>>
>
> Is it possible to decompress and extract the kernel image from the
> bzImage without executing it? Ie, is there enough information to find
> the compressed data part of the bzImage by inspection?
>
> At some point we'll need to change the Xen domain builder to handle
> bzImage files, and it would be best if we didn't need to run them.
>
Probabilistically, you might be able to (search for a gzip header), but
it is *definitely* not guaranteed by protocol.
-hpa
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