Gavin Sherry <swm@linuxworld.com.au> writes:
> It would be perhaps one of the most impressive hacks ever if someone
> could dream machine code to put in the overrun which consisted
> entirely of printable characters.
At least for the x86 architecture, working ASCII-only shell code
exists (even shell code which consists just of letters!). See for
example:
http://cert.uni-stuttgart.de/archive/vuln-dev/2000/10/msg00200.html
ASCII-only shellcode for RISC platforms is even harder and might be
impossible.
--
Florian Weimer Weimer@CERT.Uni-Stuttgart.DE
University of Stuttgart http://CERT.Uni-Stuttgart.DE/people/fw/
RUS-CERT fax +49-711-685-5898