Messages in this thread | | | From | (Eric W. Biederman) | Subject | Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage | Date | Sun, 29 Apr 2007 12:10:13 -0600 |
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"H. Peter Anvin" <hpa@zytor.com> writes:
> 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.
I suspect the issue isn't so much skipping the decompression but either getting at the Xen ELF notes or bypassing privileged instructions.
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