linux-kernel - Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/