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Re: Overflowing Scripts fail to work
From: Peter Kosinar <goober () ksp sk>
Date: Tue, 25 Apr 2006 00:11:59 +0200 (CEST)

###Content of exp.py########################
#! /bin/env python

import os
os.system("./test "+("A" * 524))
############################################

As the others have already pointed out, the program (most likely) DOES crash you just don't see the fancy "Speicherzugriffsfehler" / "Segmentation fault" message. The reason is simple -- that message is not produced by the failing program itself; it's written by bash/zsh/whatever nice shell you're using when it detects that the spawned child process has died because of SIGSEGV (signal 11). If you increase the rlimit on coresize, you'll get the core file for later analysis.

It might be a good idea to prefix the os.system() call with something like "print"; the program should output "11" which corresponds to the SIGSEGV mentioned before.

Peter

--
[Name] Peter Kosinar   [Quote] 2B | ~2B = exp(i*PI)   [ICQ] 134813278


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