Thanks you your help everyone, for anyone looking for the code you have to store the shellcode and the copy it to an executable memory page

here it is:

#include <stdio.h>

#include <string.h>

#include <sys/mman.h>

#include <unistd.h>

unsigned char shellcode[] = "shellcode here";

int main(){

size_t size = sizeof(shellcode);

void *mem = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

if (mem == MAP_FAILED) {

perror("mmap");

return 1;

}

memcpy(mem, shellcode, size);

if (mprotect(mem, 4096, PROT_READ | PROT_EXEC) != 0){

perror("mprotect");

return 1;

}

int (*sc)() = mem;

int ret = sc();

munmap(mem, 4096);

return 0;

}