[Idea][MacOS] Bypass page lockdown

[Nemirtingas]

Could use the following code to thread_suspend all other threads than mach_thread_self, unmap the region you want to hook, write the hook and remap the region.

    auto task = mach_task_self();

    thread_act_array_t threads;
    mach_msg_type_number_t thread_count;
    kern_return_t kr = task_threads(task, &threads, &thread_count);

    thread_t thread = MACH_PORT_NULL;

    std::cout << "Thread count: " << thread_count << std::endl;
    for (long i = thread_count - 1; thread == MACH_PORT_NULL && i >= 0; i--)
    {
        thread_t this_thread = mach_thread_self();
        std::cout << "This thread: " << this_thread << ", current thread: " << threads[i] << std::endl;
    }

    for (size_t i = 0; i < thread_count; i++)
        mach_port_deallocate(task, threads[i]);

    mach_vm_deallocate(task, (mach_vm_address_t) threads, thread_count * sizeof(*threads));

To be noted, the first thread's id seems to always be 259.