redirect function pake shellcode

shell.c

// solusi yang saya tulis di :
// https://stackoverflow.com/questions/59536438/calling-x86-local-function-using-shellcode

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

void redirect() {
    FILE *out = fopen("redirect.txt", "w");
    fprintf(out, "REDIRECT WORKED");
    fclose(out);
}

void f_func() {
//    unsigned char *f_code_original = "\x55\x48\x89\xe5\x48\x83\xec\x10\xb8\x00\x00\x00\x00\xe8\x00\x00\x00\x00\x89\x45\xfc\xb8\x2a\x00\x00\x00\xc9\xc3";
//    unsigned char f_code_modified[] = "\x55\x48\x89\xe5\x48\x83\xec\x10\xb8\x00\x00\x00\x00\xe8\xbb\x84\x04\x08\xb8\x00\x00\x00\x00\xe8\x00\x00\x00\x00\x89\x45\xfc\x8b\x45\xfc\xc9\xc3";

// Here shellcode, I wrote :

    unsigned char *test_shellcode = "\x55\x48\x89\xe5\x48\x83\xec\x10\xb8\xbb\x84\x04\x08\xff\xd0\x89\x45\xfc\x8b\x45\xfc\xc9\xc3";

//    unsigned char *test_shellcode2 = "\x55\x48\x89\xe5\x48\x83\xec\x10\xb8\xbb\x84\x04\x08\xff\xd0\xb8\x00\x00\x00\x00\xe8\xa3\x7f\xfb\xf7\x89\x45\xfc\x8b\x45\xfc\xc9\xc3";

    int value = 0;

    int (*f)() = (int (*)())test_shellcode;
    value = f();

    printf("%d\n", value);
}

int main(int argc, char **argv) {
    f_func();
}

test_shellcode.asm

global _start
section .text

_start:

  push    ebp
  dec     eax
  mov     ebp, esp
  dec     eax
  sub     esp, 0x10
  mov     eax, 0x080484bb    ; redirect() function address
  call    eax
  mov     dword [ebp-0x4], eax
  mov     eax, dword [ebp-0x4]
  leave
  ret

test_shellcode2.asm

global _start
section .text

_start:

    push    ebp
    dec     eax
    mov     ebp, esp
    dec     eax
    sub     esp, 0x10
    mov     eax, 0x80484bb    ; redirect() function address
    call    eax
    mov     eax, 0x0
    call    0x1c
    mov     dword [ebp-0x4], eax
    mov     eax, dword [ebp-0x4]
    leave
    ret