lkml.org 
[lkml]   [2003]   [Mar]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: 2.5.63 accesses below %esp (was: Re: ntfs OOPS (2.5.63))
Date
From
Szakacsits Szabolcs <szaka@sienet.hu> said:
> On Wed, 12 Mar 2003, Horst von Brand wrote:
> > It is _hard_ to do with variable length instructions (CISC, remember?), the
> > code is designed to be easily decoded forward, noone executes code going
> > backwards.

> Of course, it's a bad approach. You start earlier and stop at EIP.
> Repeat this for max(instruction length) different offsets and you will
> have the winner. Figure it out from the context after EIP.

By hand, OK. Automatically, no.

> > When I needed to look at the code in an Oops I'd either objdump(1)ed it or
> > compiled the offending stuff to assembler (possibly with custom CFLAGS to
> > get info on line numbers and such in the output).

> I was talking about cases when you can't do these.

I did this to find out where in the source it went south, and then look
around to find out why. A copy of that kernel's source is required anyway.

If you can divine the breakage just from the asm, more power to you. For us
mere mortals it isn't enough.
--
Dr. Horst H. von Brand User #22616 counter.li.org
Departamento de Informatica Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria +56 32 654239
Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:33    [W:0.084 / U:1.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site