uint64_t call_remote(mach_port_t task_port, void* fptr, int n_params, ...)

{

    if (n_params > MAX_REMOTE_ARGS || n_params < 0){

        NSLog(@"unsupported number of arguments to remote function (%d)\n", n_params);

        return 0;

    }

    kern_return_t err;

    uint64_t remote_stack_base = 0;

    uint64_t remote_stack_size = 4*1024*1024;

    remote_stack_base = remote_alloc(task_port, remote_stack_size);

    uint64_t remote_stack_middle = remote_stack_base + (remote_stack_size/2);

    // create a new thread in the target

    // just using the mach thread API doesn't initialize the pthread thread-local-storage

    // which means that stuff which relies on that will crash

    // we can sort-of make that work by calling _pthread_set_self(NULL) in the target process

    // which will give the newly created thread the same TLS region as the main thread

    _STRUCT_ARM_THREAD_STATE64 thread_state = {{0}};

    mach_msg_type_number_t thread_stateCnt = sizeof(thread_state)/4;

    // we'll start the thread running and call _pthread_set_self first:

    thread_state.__sp = remote_stack_middle;

    thread_state.__pc = (uint64_t)_pthread_set_self;

    // set these up to put us into a predictable state we can monitor for:

    uint64_t loop_lr = find_blr_x19_gadget();

    thread_state.__x[19] = loop_lr;

    thread_state.__lr = loop_lr;

    // set the argument to NULL:

    thread_state.__x[0] = 0;

    mach_port_t thread_port = MACH_PORT_NULL;

    err = thread_create_running(task_port, ARM_THREAD_STATE64, (thread_state_t)&thread_state, thread_stateCnt, &thread_port);

    if (err != KERN_SUCCESS){

        NSLog(@"error creating thread in child: %s\n", mach_error_string(err));

        return 0;

    }

    // NSLog(@"new thread running in child: %x\n", thread_port);

    // wait for it to hit the loop:

    while(1){

        // monitor the thread until we see it's in the infinite loop indicating it's done:

        err = thread_get_state(thread_port, ARM_THREAD_STATE64, (thread_state_t)&thread_state, &thread_stateCnt);

        if (err != KERN_SUCCESS){

            NSLog(@"error getting thread state: %s\n", mach_error_string(err));

            return 0;

        }

        if (thread_state.__pc == loop_lr && thread_state.__x[19] == loop_lr){

            // thread has returned from the target function

            break;

        }

    }

以上代码thread_create_running执行后被注入的进程会挂掉。

日志打印如下：

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