Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol forrelocatable bzImage

From: H. Peter Anvin
Date: Sun Apr 29 2007 - 13:52:18 EST

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.

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