The code...

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <sys/mman.h>
#include <unistd.h>

typedef unsigned char byte;
 /*
bool ProtectMemory(void * addr, int flags)
{
        // Constant holding the page size value
        const size_t pageSize = sysconf(_SC_PAGE_SIZE);

        // Calculate relative page offset
        size_t temp = (size_t) addr;
        temp -= temp % pageSize;

        // Update address
        addr = (void*) temp;

        // Update memory area protection
        return !mprotect(addr, pageSize, flags);
}
 */
typedef int (*testFunc)(int, int);

int main(void)
{
    char func[] = {0x55, 0x89, 0xe5, 0x8b, 0x45, 0x0c, 0x8b, 0x55, 0x08, 0x01, 0xd0, 0x5d, 0xc3 };

    /*testFunc func_copy = (testFunc) malloc(sizeof(func));
    memcpy((void*) func_copy, (void*) func, sizeof(func));

    ProtectMemory((void*)func_copy, PROT_WRITE | PROT_READ | PROT_EXEC);

    printf("1 + 2 = %d\n", func_copy(1,2)); // segfaults here

    free(func_copy);
    return 0;*/

    int (* func_copy)(int,int) = mmap(NULL, sizeof(func),
        PROT_WRITE | PROT_READ | PROT_EXEC,
        MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);

    printf("1 + 2 = %d\n", func_copy(1,2));

    munmap(func_copy, sizeof(func));
    return EXIT_SUCCESS;
}