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Message-ID: <20130521150046.GA22559@openwall.com>
Date: Tue, 21 May 2013 19:00:46 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: AMD GCN ISA development
Sayantan, Daniel -
On Tue, May 21, 2013 at 08:07:46AM +0530, Sayantan Datta wrote:
> On Sat, May 18, 2013 at 8:34 PM, D?niel Bali <balijanosdaniel@...il.com>wrote:
>
> > Does anybody know what tool I should use to do this? Should I use libelf
> > itself?
>
> It is better to use libelf-devel for modifying binaries. Also you can't
> just modify the text section unless it has the exact same size as before.
> If the size is different you also need to update the symtab section.
Why don't we use a hack, at least initially: simply generate a large
enough (inner) ELF for a dummy kernel, and be replacing its contents?
Since our actual code size will need to be smaller in all cases, we'll
simply pad it with zeroes or whatever. Would this work?
Alexander
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