Shellcodes: I cannot execute them :(

[bulkangel]

Hello everyone,

I've just started my "buffer overflow study" ... To begin, I thought it was a good idea to compile and understand some generic shellcodes, like whose we find on millw0rm.
Anyway, I took this one:

http://www.milw0rm.org/shellcode/445

giving me a stupid shell...

What a surprise when I compiled it and saw that nothing happened ! So why ? I tried to debug it, but without success :/.

For information, I've GCC i686-pc-linux-gnu-4.1.1, and I compiled my shellcode with

gcc -o shell shell.c -Wall -g (-pedantic)

Thank you for your help !

bulk'

[rcgreen]

printf("Shellcode lenght=%d\n",strlen(shellcode));

They misspelled the word "length" LOL

[Relyt]

Originally posted here by bulkangel
...
What a surprise when I compiled it and saw that nothing happened ! So why ? I tried to debug it, but without success :/.

Don't be surprised by that. It is a fairly common practice to toss errors in, remove lines of code, etc. Helps reduce the likelyhood that the skiddies can just c/p. In this case though, it looks like just sloppiness....

[skiddieleet]

That code works fine for me. I compiled it with
gcc -o shell shell.c
ran it as
./shell
and it print the shellcode length and gave me a shell. Maybe you're on the wrong architecture or something.