Windows内核

Windows 组件概述

调用例如CreateFile这个NTDll的API，这个API会进入0环，在0环里面找到相关的服务，将信息先传给IO Mgr，被打包为IRP，然后传递给驱动，等待驱动完成请求，处理完以后，才将结果返回给Ring3

1720751365586

WriteFile => ntdll.dll => kernel => I/O Manager => AllocIrp => Driver

一些介绍

IoCompleteRequest 是 Windows 内核模式驱动程序开发中的一个关键函数，用于完成 I/O 请求并通知 I/O 管理器和请求的发起者（通常是用户模式应用程序或其他内核模式组件）操作已经完成。这个函数会更新 IRP（I/O 请求包）的状态，并根据请求的优先级和完成状态触发相应的后续操作。 

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VOID IoCompleteRequest(
  _Inout_ PIRP Irp,
  _In_    CCHAR PriorityBoost
);

使用方法

IoCompleteRequest 通常在驱动程序完成对 I/O 请求的处理后调用。它通常在以下几种情况下使用：

  1. IRP 处理完成: 驱动程序完成对 IRP 的处理，例如读写操作已完成。
  2. 错误处理: 驱动程序在处理 IRP 时遇到错误，需要终止请求并返回错误状态。
  3. 中断处理: 驱动程序在处理中断请求时，完成对中断的处理并通知系统。

ProbeForWrite 是 Windows 内核模式下的一个函数，用于验证用户模式传递的缓冲区是否可以写入。它在处理来自用户模式的数据时非常重要，因为内核模式代码不能直接信任用户模式传递的指针。这是因为用户模式的应用程序可以传递一个无效或不合法的指针，导致内核模式代码在访问该指针时引发异常，甚至导致系统崩溃（蓝屏）。 （注意是用户模式传递的缓冲区！！！！）一般也就判断Irp->UserBuffer

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VOID ProbeForWrite(
  __inout PVOID Address,
  __in    SIZE_T Length,
  __in    ULONG Alignment
);

Address: 用户模式缓冲区的起始地址。

Length: 缓冲区的长度（字节数）。

Alignment: 缓冲区必须对齐的边界（以字节为单位），通常设置为 1 表示不需要特别的对齐。

MmIsAddressValid 是 Windows 驱动程序开发中常用的一个函数，用于检查指定的内存地址是否有效，即是否在当前进程的虚拟地址空间范围内。 

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BOOLEAN MmIsAddressValid(
  PVOID VirtualAddress
);

参数：

  • VirtualAddress：要检查的虚拟内存地址。

返回值：

  • TRUE：如果指定的虚拟地址在当前进程的虚拟地址空间范围内且有效。
  • FALSE：如果指定的虚拟地址无效或不在当前进程的虚拟地址空间范围内。

Irp->IoStatus.Status = STATUS_SUCCESS; 和 return STATUS_SUCCESS; 在驱动程序开发中有不同的作用和意义，尽管它们都使用了相同的状态代码 STATUS_SUCCESS。下面解释它们的区别和各自的作用：

Irp->IoStatus.Status = STATUS_SUCCESS;

这行代码设置了当前 I/O 请求包（IRP）的状态。IRP 是操作系统用来描述和跟踪 I/O 操作的结构。当驱动程序处理一个 I/O 请求时，它会设置 Irp->IoStatus.Status 字段来指示操作的结果。

  • 作用：

    • 通过设置 Irp->IoStatus.Status，驱动程序通知操作系统这个 I/O 请求的处理状态（成功或失败）。
    • 这个字段的值会在 IoCompleteRequest 调用之后返回给发起 I/O 请求的代码（通常是用户模式应用程序或内核模式组件）。

return STATUS_SUCCESS;

这行代码是函数返回值的一部分，用来指示函数执行的结果状态。它与设置 IRP 状态不同，因为它是函数本身的返回值。

R3往R0写入数据WriteFile

驱动的代码这样写：

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// MyWrite
NTSTATUS MyWrite(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    DeviceObject;
   // PIO_STACK_LOCATION pIrpStack = IoGetCurrentIrpStackLocation(Irp);
    VOID* lpBuf = Irp->UserBuffer; // Use SystemBuffer
    KdPrint(("Write\n"));
    KdPrint(("0x%p\n", &g_GlobalBuffer));
    __try {
        //DEVICE_EXTENSION* device_extension_ptr = (DEVICE_EXTENSION*)DeviceObject->DeviceExtension;
        // Validate and probe user buffer
        if (MmIsAddressValid(lpBuf)) {
            ProbeForRead(lpBuf, sizeof(lpBuf), 1);
        }
        else {
            KdPrint(("Invalid user buffer address\n"));
            Irp->IoStatus.Status = STATUS_INVALID_USER_BUFFER;
            Irp->IoStatus.Information = 0;
            IoCompleteRequest(Irp, IO_NO_INCREMENT);
            return STATUS_INVALID_USER_BUFFER;
        }
        RtlCopyMemory(g_GlobalBuffer, lpBuf, wcslen((TCHAR*)lpBuf)*sizeof(TCHAR)+1);
        KdPrint(("g_GlobalBuffer是 %s\n", g_GlobalBuffer));
        Irp->IoStatus.Status = STATUS_SUCCESS;
        Irp->IoStatus.Information = wcslen((TCHAR*)lpBuf)*sizeof(TCHAR);
    }
    __except (EXCEPTION_EXECUTE_HANDLER) {
        KdPrint(("Exception occurred: Access violation\n"));
        // Set IRP status for exception
        Irp->IoStatus.Status = GetExceptionCode();
        Irp->IoStatus.Information = 0;
    }
    // Complete the request
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return Irp->IoStatus.Status;
}

注意注意：

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RtlCopyMemory(g_GlobalBuffer, lpBuf, wcslen((TCHAR*)lpBuf)*sizeof(TCHAR)+1);

这里要多一个字节，否则没有 ‘\x00’ 结尾容易出大问题

MFC代码：（和下面读出数据用的是同一个）：

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#define DEVICE_NAME L"\\\\.\\2024_07_12_link"
#define BUFFER_SIZE 256
void CReadWriteRing3MFCDlg::OnBnClickedButtonWrite()
{
	UpdateData(TRUE);
	HANDLE hDevice;
	DWORD bytesReturned;
	char writeBuffer[BUFFER_SIZE] = "Hello from user mode!";

	hDevice = CreateFile(DEVICE_NAME, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hDevice == INVALID_HANDLE_VALUE) {
		CString errorMsg;
		errorMsg.Format(L"Failed to open device. Error code: %d", GetLastError());
		AfxMessageBox(errorMsg);
		return;
	}

	if (!WriteFile(hDevice, Write_Text, Write_Text.GetLength(), &bytesReturned, NULL)) {
		CString errorMsg;
		errorMsg.Format(L"Failed to write to device. Error code: %d", GetLastError());
		AfxMessageBox(errorMsg);
		CloseHandle(hDevice);
		return;
	}

	CString str;
	str.Format(L"Wrote %d bytes to the device: %s\n", bytesReturned, Write_Text);
	AfxMessageBox(str);

	CloseHandle(hDevice);
}


void CReadWriteRing3MFCDlg::OnBnClickedButtonRead()
{
	// TODO: 在此添加控件通知处理程序代码
	UpdateData(FALSE);


	HANDLE hDevice;
	DWORD bytesReturned;
	

	hDevice = CreateFile(DEVICE_NAME, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hDevice == INVALID_HANDLE_VALUE) {
		CString errorMsg;
		errorMsg.Format(L"Failed to open device. Error code: %d", GetLastError());
		AfxMessageBox(errorMsg);
		return;
	}

	if (!ReadFile(hDevice, Read_Text.GetBuffer(), 100, &bytesReturned, NULL)) {
		CString errorMsg;
		errorMsg.Format(L"Failed to write to device. Error code: %d", GetLastError());
		AfxMessageBox(errorMsg);
		CloseHandle(hDevice);
		return;
	}

	CString str;
	str.Format(L"read %d bytes to the device: %s\n", bytesReturned, Read_Text);
	AfxMessageBox(str);

	CloseHandle(hDevice);
	return;

	
}

效果图：

1720871601336

R3从R0读出数据ReadFile

驱动这样写：

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NTSTATUS MyRead(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    DeviceObject;
    KdPrint(("Read!!!\n"));
    KdPrint(("全局变量有%d个字节",wcslen(g_GlobalBuffer) * sizeof(WCHAR)));

    __try {
        //DEVICE_EXTENSION* device_extension_ptr = (DEVICE_EXTENSION*)DeviceObject->DeviceExtension;

        // Validate and probe user buffer
        if (MmIsAddressValid(Irp->UserBuffer)) {
            ProbeForRead(Irp->UserBuffer, Irp->IoStatus.Information, sizeof(WCHAR));
        }
        else {
            KdPrint(("Invalid user buffer address\n"));
            Irp->IoStatus.Status = STATUS_INVALID_USER_BUFFER;
            Irp->IoStatus.Information = 0;
            IoCompleteRequest(Irp, IO_NO_INCREMENT);
            return STATUS_INVALID_USER_BUFFER;
        }

        //NTSTATUS status;

        // 获取字符串的长度
       
        RtlCopyMemory(Irp->UserBuffer, g_GlobalBuffer, wcslen(g_GlobalBuffer)*sizeof(TCHAR)+1);
        KdPrint(("Irp->AssociatedIrp.SystemBuffer %ls\n", (PTCHAR)Irp->UserBuffer));
        KdPrint(("读到的字数是 %d", wcslen(g_GlobalBuffer)));

        Irp->IoStatus.Status = STATUS_SUCCESS;
        Irp->IoStatus.Information = wcslen(g_GlobalBuffer) * sizeof(WCHAR);
    }
    __except (EXCEPTION_EXECUTE_HANDLER) {
        KdPrint(("Exception occurred: Access violation\n"));

        // Set IRP status for exception
        Irp->IoStatus.Status = GetExceptionCode();
        Irp->IoStatus.Information = 0;
    }

    return STATUS_SUCCESS;
    
}

完整驱动程序代码：

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#include "header.h"
#define BUFFER_SIZE 256
typedef struct _DEVICE_EXTENSION {
    CHAR Buffer[BUFFER_SIZE];
    ULONG BufferLength;
} DEVICE_EXTENSION, * PDEVICE_EXTENSION;
TCHAR g_GlobalBuffer[BUFFER_SIZE]={0}; // 全局缓冲区
// DriverEntry
NTSTATUS DriverEntry(PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath) {
    UNREFERENCED_PARAMETER(RegistryPath);

    DriverObject->DriverUnload = DriverUnload;
    DriverObject->MajorFunction[IRP_MJ_CREATE] = MyCreate;
    DriverObject->MajorFunction[IRP_MJ_CLOSE] = MyClose;
    DriverObject->MajorFunction[IRP_MJ_READ] = MyRead;
    DriverObject->MajorFunction[IRP_MJ_WRITE] = MyWrite;
    KdPrint(("Create!\n"));
    // 创建设备对象
    UNICODE_STRING deviceName = RTL_CONSTANT_STRING(L"\\Device\\MyDevice");
    UNICODE_STRING symbolicLink = RTL_CONSTANT_STRING(L"\\??\\2024_07_12_link");
    PDEVICE_OBJECT deviceObject = NULL;
    NTSTATUS status = IoCreateDevice(DriverObject, sizeof(DEVICE_EXTENSION), &deviceName, FILE_DEVICE_UNKNOWN, 0, FALSE, &deviceObject);
    if (!NT_SUCCESS(status)) {
        return status;
    }
    // 初始化设备扩展
    PDEVICE_EXTENSION devExt = (PDEVICE_EXTENSION)deviceObject->DeviceExtension;
    RtlZeroMemory(devExt, sizeof(DEVICE_EXTENSION));
    status = IoCreateSymbolicLink(&symbolicLink, &deviceName);
    if (!NT_SUCCESS(status)) {
        IoDeleteDevice(deviceObject);
        return status;
    }
    return STATUS_SUCCESS;
}
// DriverUnload
VOID DriverUnload(PDRIVER_OBJECT DriverObject) {
    DbgPrint("Unload\n");
    UNICODE_STRING symbolicLink = RTL_CONSTANT_STRING(L"\\??\\2024_07_12_link");
    IoDeleteSymbolicLink(&symbolicLink);
    IoDeleteDevice(DriverObject->DeviceObject);
}
// MyCreate
NTSTATUS MyCreate(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    DbgPrint("Create!\n");
    UNREFERENCED_PARAMETER(DeviceObject);
    Irp->IoStatus.Status = STATUS_SUCCESS;
    Irp->IoStatus.Information = 0;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return STATUS_SUCCESS;
}
// MyClose
NTSTATUS MyClose(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    DbgPrint("Close!\n");
    UNREFERENCED_PARAMETER(DeviceObject);
    Irp->IoStatus.Status = STATUS_SUCCESS;
    Irp->IoStatus.Information = 0;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return STATUS_SUCCESS;
}
// MyRead
NTSTATUS MyRead(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    DeviceObject;
    KdPrint(("Read!!!\n"));
    KdPrint(("全局变量有%d个字节",wcslen(g_GlobalBuffer) * sizeof(WCHAR)));

    __try {
        //DEVICE_EXTENSION* device_extension_ptr = (DEVICE_EXTENSION*)DeviceObject->DeviceExtension;

        // Validate and probe user buffer
        if (MmIsAddressValid(Irp->UserBuffer)) {
            ProbeForRead(Irp->UserBuffer, Irp->IoStatus.Information, sizeof(WCHAR));
        }
        else {
            KdPrint(("Invalid user buffer address\n"));
            Irp->IoStatus.Status = STATUS_INVALID_USER_BUFFER;
            Irp->IoStatus.Information = 0;
            IoCompleteRequest(Irp, IO_NO_INCREMENT);
            return STATUS_INVALID_USER_BUFFER;
        }
        //NTSTATUS status;
        // 获取字符串的长度
        RtlCopyMemory(Irp->UserBuffer, g_GlobalBuffer, wcslen(g_GlobalBuffer)*sizeof(TCHAR)+1);
        KdPrint(("Irp->AssociatedIrp.SystemBuffer %ls\n", (PTCHAR)Irp->UserBuffer));
        KdPrint(("读到的字数是 %d", wcslen(g_GlobalBuffer)));

        Irp->IoStatus.Status = STATUS_SUCCESS;
        Irp->IoStatus.Information = wcslen(g_GlobalBuffer) * sizeof(WCHAR);
    }
    __except (EXCEPTION_EXECUTE_HANDLER) {
        KdPrint(("Exception occurred: Access violation\n"));

        // Set IRP status for exception
        Irp->IoStatus.Status = GetExceptionCode();
        Irp->IoStatus.Information = 0;
    }
    return STATUS_SUCCESS;
}
// MyWrite
NTSTATUS MyWrite(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    DeviceObject;
   // PIO_STACK_LOCATION pIrpStack = IoGetCurrentIrpStackLocation(Irp);
    
    VOID* lpBuf = Irp->UserBuffer; // Use SystemBuffer
    KdPrint(("Write\n"));

    KdPrint(("0x%p\n", &g_GlobalBuffer));
    __try {
        //DEVICE_EXTENSION* device_extension_ptr = (DEVICE_EXTENSION*)DeviceObject->DeviceExtension;

        // Validate and probe user buffer
        if (MmIsAddressValid(lpBuf)) {
            ProbeForRead(lpBuf, sizeof(lpBuf), 1);
        }
        else {
            KdPrint(("Invalid user buffer address\n"));
            Irp->IoStatus.Status = STATUS_INVALID_USER_BUFFER;
            Irp->IoStatus.Information = 0;
            IoCompleteRequest(Irp, IO_NO_INCREMENT);
            return STATUS_INVALID_USER_BUFFER;
        }
        RtlCopyMemory(g_GlobalBuffer, lpBuf, wcslen((TCHAR*)lpBuf)*sizeof(TCHAR)+1);
        KdPrint(("g_GlobalBuffer是 %s\n", g_GlobalBuffer));  
        Irp->IoStatus.Status = STATUS_SUCCESS;
        Irp->IoStatus.Information = wcslen((TCHAR*)lpBuf)*sizeof(TCHAR);
    }
    __except (EXCEPTION_EXECUTE_HANDLER) {
        KdPrint(("Exception occurred: Access violation\n"));

        // Set IRP status for exception
        Irp->IoStatus.Status = GetExceptionCode();
        Irp->IoStatus.Information = 0;
    }
    // Complete the request
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return Irp->IoStatus.Status;
}

效果图：

1720871629228

IRP_MJ_DEVICE_CONTROL_DeviceIoControl

例如要读一个设备（例如某个光驱）里面的文件，但是因为IRP_MJ_WRITE和IRP_MJ_READ这俩事件是没有传递参数的，这是一个痛点，没办法传递额外的参数

于是就有了去处理这个事件

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#define IRP_MJ_DEVICE_CONTROL           0x0e

DeviceIoControl 是 Windows 平台上用于与驱动程序通信的重要函数之一，它允许用户应用程序与设备驱动程序进行数据交换和控制操作。以下是关于 DeviceIoControl 函数的详细介绍： 

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BOOL DeviceIoControl(
  HANDLE       hDevice,
  DWORD        dwIoControlCode,
  LPVOID       lpInBuffer,
  DWORD        nInBufferSize,
  LPVOID       lpOutBuffer,
  DWORD        nOutBufferSize,
  LPDWORD      lpBytesReturned,
  LPOVERLAPPED lpOverlapped
);

参数：

  • hDevice：设备的句柄，通过 CreateFile 函数获取。
  • dwIoControlCode：指定设备控制码，用于标识要执行的操作。
  • lpInBuffer：输入数据的缓冲区指针，用于向设备传递数据。
  • nInBufferSize：输入数据缓冲区的大小，以字节为单位。
  • lpOutBuffer：输出数据的缓冲区指针，用于从设备获取数据。
  • nOutBufferSize：输出数据缓冲区的大小，以字节为单位。
  • lpBytesReturned：指向 DWORD 类型的变量的指针，用于接收实际传输的字节数。
  • lpOverlapped：指向 OVERLAPPED 结构的指针，支持异步 I/O 操作。可以传递 NULL 进行同步操作。

DeviceIoControl比WriteFile和ReadFile相比，WriteFile既能IN也能Out

DeviceIoControl 提供了对设备的多种控制功能，不仅限于数据的读写。可以通过控制码（IOCTL）执行特定的设备操作，如配置设备、查询状态、执行诊断命令等。

允许用户定义自定义控制码，使驱动程序能够支持特定的功能和操作，这些是 WriteFile 和 ReadFile 所无法实现的。

在驱动程序中，那么IRP_MJ_DEVICE_CONTROL 事件里面，Buffer有俩，Length也有俩，这就很尴尬了。

实际上，输入的Buffer还是Irp->UserBuffer

其他的参数在IRP堆栈里面拿：

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PIO_STACK_LOCATION pIrpstack = IoGetCurrentIrpStackLocation(Irp);
PVOID lpInBuf = Irp->UserBuffer;
PVOID lpOutBuf = pIrpstack->Parameters.DeviceIoControl.Type3InputBuffer;
ULONG nInLength = pIrpstack->Parameters.DeviceIoControl.InputBufferLength;
ULONG nOutLength = pIrpstack->Parameters.DeviceIoControl.OutputBufferLength;

还有一个参数IoControlCode：指定设备控制码，用于标识要执行的操作。

框架：

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#define IOCTL_CUSTOM_FUNC1 CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_CUSTOM_FUNC2 CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_IN_DIRECT, FILE_ANY_ACCESS)

NTSTATUS MyDeviceControlRoutine(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    PIO_STACK_LOCATION irpSp;
    PVOID inputBuffer;
    PVOID outputBuffer;
    ULONG inputBufferLength;
    ULONG outputBufferLength;
    ULONG ioControlCode;
    NTSTATUS ntStatus = STATUS_SUCCESS;

    UNREFERENCED_PARAMETER(DeviceObject);

    irpSp = IoGetCurrentIrpStackLocation(Irp);
    inputBuffer = Irp->AssociatedIrp.SystemBuffer;
    outputBuffer = irpSp->Parameters.DeviceIoControl.Type3InputBuffer;
    inputBufferLength = irpSp->Parameters.DeviceIoControl.InputBufferLength;
    outputBufferLength = irpSp->Parameters.DeviceIoControl.OutputBufferLength;
    ioControlCode = irpSp->Parameters.DeviceIoControl.IoControlCode;

    switch (ioControlCode) {
        case IOCTL_CUSTOM_FUNC1:
            // Handle custom function 1
            // Example: Copy input data to output buffer
            if (inputBuffer && outputBuffer && inputBufferLength == outputBufferLength) {
                RtlCopyMemory(outputBuffer, inputBuffer, inputBufferLength);
                Irp->IoStatus.Information = inputBufferLength;
            } else {
                ntStatus = STATUS_INVALID_PARAMETER;
            }
            break;

        case IOCTL_CUSTOM_FUNC2:
            // Handle custom function 2
            // Example: Return success without doing anything
            Irp->IoStatus.Information = 0;
            break;

        default:
            // Unsupported control code
            ntStatus = STATUS_INVALID_DEVICE_REQUEST;
            break;
    }

    Irp->IoStatus.Status = ntStatus;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);

    return ntStatus;
}

CTL_CODE: CTL_CODE 是一个宏，用于定义 Windows 设备控制码（IOCTL）

参数说明

  • DeviceType：设备类型，通常使用 FILE_DEVICE_* 类型定义，如 FILE_DEVICE_UNKNOWN、FILE_DEVICE_KEYBOARD 等。
  • Function：功能码，用于标识具体的控制操作，应该是一个唯一的值，用于识别设备支持的不同功能。
  • Method：传输方法，指定数据传输的方式，可以是 METHOD_BUFFERED、METHOD_IN_DIRECT、METHOD_OUT_DIRECT 或 METHOD_NEITHER 中的一个。(这个很重要，涉及到参数去哪里拿)
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switch (METHOD_FROM_CTL_CODE(ioControlCode)) {
        case METHOD_BUFFERED:
            inputBuffer = Irp->AssociatedIrp.SystemBuffer;
            outputBuffer = Irp->AssociatedIrp.SystemBuffer;
            break;

        case METHOD_IN_DIRECT:
            inputBuffer = Irp->AssociatedIrp.SystemBuffer;
            if (Irp->MdlAddress) {
                outputBuffer = MmGetSystemAddressForMdlSafe(Irp->MdlAddress, NormalPagePriority);
            }
            break;

        case METHOD_OUT_DIRECT:
            inputBuffer = Irp->AssociatedIrp.SystemBuffer;
            if (Irp->MdlAddress) {
                outputBuffer = MmGetSystemAddressForMdlSafe(Irp->MdlAddress, NormalPagePriority);
            }
            break;

        case METHOD_NEITHER:
            inputBuffer = irpSp->Parameters.DeviceIoControl.Type3InputBuffer;
            outputBuffer = Irp->UserBuffer;
            break;

        default:
            status = STATUS_INVALID_DEVICE_REQUEST;
            Irp->IoStatus.Information = 0;
            IoCompleteRequest(Irp, IO_NO_INCREMENT);
            return status;
    }
  • Access：访问权限，指定谁可以访问设备控制码。常见的值包括 FILE_ANY_ACCESS、FILE_READ_ACCESS 和 FILE_WRITE_ACCESS。

驱动程序代码：

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#define IOCTL_CUSTOM_FUNC1 CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_CUSTOM_FUNC2 CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS)


NTSTATUS MyDeviceControlRoutine(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
    PIO_STACK_LOCATION irpSp;
    PVOID inputBuffer;
    PVOID outputBuffer;
    ULONG inputBufferLength;
    ULONG outputBufferLength;
    ULONG ioControlCode;
    NTSTATUS ntStatus = STATUS_SUCCESS;

    UNREFERENCED_PARAMETER(DeviceObject);

    irpSp = IoGetCurrentIrpStackLocation(Irp);
    inputBuffer = Irp->AssociatedIrp.SystemBuffer;
    outputBuffer = Irp->AssociatedIrp.SystemBuffer;
    inputBufferLength = irpSp->Parameters.DeviceIoControl.InputBufferLength;
    outputBufferLength = irpSp->Parameters.DeviceIoControl.OutputBufferLength;
    ioControlCode = irpSp->Parameters.DeviceIoControl.IoControlCode;
    KdPrint(("ioControlCode为0x%x\n", ioControlCode));
    KdPrint(("inputBuffer地址为%p，inputBuffer内容为%s\n", inputBuffer, inputBuffer));
    KdPrint(("outputBuffer地址为%p，outputBuffer内容为%s\n", outputBuffer, outputBuffer));
    KdPrint(("%d %d\n", inputBufferLength, outputBufferLength));
    switch (ioControlCode) 
    {
    case IOCTL_CUSTOM_FUNC1:
    {
        // Handle custom function 1
        // Example: Copy input data to output buffer
        KdPrint(("IOCTL_CUSTOM_FUNC1!\n"));
        KdPrint(("%ls\n", (TCHAR*)inputBuffer));
        RtlCopyMemory(g_GlobalBuffer, inputBuffer, inputBufferLength);
        KdPrint(("g_GlobalBuffer为%ls\n", g_GlobalBuffer));
        Irp->IoStatus.Status = STATUS_SUCCESS;
        break;
    }
        

    case IOCTL_CUSTOM_FUNC2:
    {

        KdPrint(("IOCTL_CUSTOM_FUNC2!\n"));
        
            if (wcslen(g_GlobalBuffer)*sizeof(TCHAR) < 256)
                outputBufferLength = wcslen(g_GlobalBuffer) * sizeof(TCHAR);
            KdPrint(("g_GlobalBuffer为%ls\n", g_GlobalBuffer));
            RtlCopyMemory(outputBuffer, g_GlobalBuffer, outputBufferLength);
            KdPrint(("outputBuffer为%ls\n", outputBuffer));
            Irp->IoStatus.Information = outputBufferLength;
            Irp->IoStatus.Status = STATUS_SUCCESS;
            break;
      
    }

    default:

        KdPrint(("无效的CTL_CODE!\n"));
        Irp->IoStatus.Status = STATUS_INVALID_DEVICE_REQUEST;
        break;
    }

    Irp->IoStatus.Status = ntStatus;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);

    return Irp->IoStatus.Status;
}

Ring3 MFC代码：

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#include <winioctl.h>
#define IOCTL_CUSTOM_FUNC1 CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_CUSTOM_FUNC2 CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_IN_DIRECT, FILE_ANY_ACCESS)
void CReadWriteRing3MFCDlg::OnBnClickedButton1()   //control_Write
{
	// TODO: 在此添加控件通知处理程序代码
	UpdateData(TRUE);
	HANDLE hDevice;
	DWORD bytesReturned;


	hDevice = CreateFile(DEVICE_NAME, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hDevice == INVALID_HANDLE_VALUE) {
		CString errorMsg;
		errorMsg.Format(L"Failed to open device. Error code: %d", GetLastError());
		AfxMessageBox(errorMsg);
		return;
	}


	DWORD dwBytesReturned;
	
	

	BOOL bResult = DeviceIoControl(hDevice,
		CTL_CODE(FILE_DEVICE_UNKNOWN, _tcstoul(M_CTL_CODE.GetBuffer(), NULL, 10), METHOD_BUFFERED, FILE_ANY_ACCESS),
		CONTROL_WRITE.GetBuffer(), CONTROL_WRITE.GetLength() * sizeof(TCHAR),
		nullptr, NULL,
		&dwBytesReturned,
		NULL);

	CString str;
	str.Format(L"%d", CONTROL_WRITE.GetLength() * sizeof(TCHAR));
	AfxMessageBox(str);
	if (bResult) {
		AfxMessageBox(L"成功！");
	}
	else {
		AfxMessageBox(L"失败！");
	}
	return;
}



void CReadWriteRing3MFCDlg::OnBnClickedButton3()  //Contro_Read
{
	// TODO: 在此添加控件通知处理程序代码
	
	HANDLE hDevice;
	DWORD bytesReturned;


	hDevice = CreateFile(DEVICE_NAME, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hDevice == INVALID_HANDLE_VALUE) {
		CString errorMsg;
		errorMsg.Format(L"Failed to open device. Error code: %d", GetLastError());
		AfxMessageBox(errorMsg);
		return;
	}


	DWORD dwBytesReturned;


	
	BOOL bResult = DeviceIoControl(hDevice,
		CTL_CODE(FILE_DEVICE_UNKNOWN, _tcstoul(M_CTL_CODE.GetBuffer(), NULL, 10), METHOD_BUFFERED, FILE_ANY_ACCESS),
		nullptr, NULL,
		CONTROL_READ.GetBuffer(), 256,
		&dwBytesReturned,
		NULL);

	if (bResult) {
		AfxMessageBox(L"成功！");
		CString str;
		str.Format(L"%d", dwBytesReturned);
		AfxMessageBox(str);
		UpdateData(FALSE);
	}
	else {
		AfxMessageBox(L"失败！");
	}
	return;
}

效果如图：

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