lkml.org 
[lkml]   [2003]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.5.63 accesses below %esp (was: Re: ntfs OOPS (2.5.63))

On Wed, 12 Mar 2003, Linus Torvalds wrote:
>
> The difficulty is finidng the right instruction boundary. It's basically
> impossible.

If I understand you correctly, no. We have the boundary at EIP.
Decoding what's before is max 7-8 tries by a human and one can figure
out the real code from the context (with high probability). 2-3 times
more code before EIP then after could significantly help of course.

> If you want to get the instructions before that point, just use
>
> gdb vmlinux

This approach frequently fails because vmlinux is on a users computer
far away and he

1) doesn't bother answering anymore
2) recompiled with different .config
3) reinstalled another distro
4) etc

> and disassemble it by hand. Because the kernel _cannot_ do it reliably.

The kernel shouldn't do it, it's not disassembler. It should just give
enough data for a human and disassembler. Nothing lost but much can be
gain.

Szaka

-
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    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site