linux-kernel - Re: 2.6.23-rc1: no setup signature found...

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Message-ID: <46B09A57.8000403@zytor.com>
Date:	Wed, 01 Aug 2007 10:36:07 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	bbpetkov@...oo.de
CC:	Xudong Guan <xudong.guan@...il.com>, linux-kernel@...r.kernel.org,
	Chuck Ebbert <cebbert@...hat.com>
Subject: Re: 2.6.23-rc1: no setup signature found...

Borislav Petkov wrote:
> 
> 	Breakpoint 4, 0x00040200 in ?? ()
> 	1: x/i ($cs << 4) + $eip  0x40300:      lea    (%si),%dx
> 	(gdb) c
> 	Continuing.
> 
> if i do delete here, it loads the second stage of grub and continues to load the
> kernel. Is there another way to land at the jmp instruction instead of poking
> blindly, maybe disassemble something parts of the initial code. \me reading
> grub-docs...
> 

If you do "delete" without a breakpoint number, you're deleting all 
breakpoints.  I just experimented with grub, and it looks like it should 
break at 0x90200, so just set that breakpoint and none of the others.

	-hpa

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