DO_DEVICE_INITIALIZING 创建设备 iocreatedevice windows内核开发

本文解释了在Windows驱动模型(WDM)中DO_DEVICE_INITIALIZING标志的作用及其清除时机。介绍了在设备驱动完成初始化后,为何及如何清除此标志,确保设备能够正常接收I/O请求。

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deviceobject->flag &= ~DO_DEVICE_INITIALIZING;

当设置DO_DEVICE_INITIALIZING标志时,I/O管理器将拒绝所有打开该设备句柄的请求以及向该设备对象上附着其他设备对象。
故驱动程序完成初始化后,须清除该标志。

在IoCreateDevice创建设备完成后,默认devieobject->flags==0xc0,是包含DO_DEVICE_INITIALIZING字段的,如果该设备是在DriverEntry例程中创建的,则DriverEntry例程结束后,I/O管理器会自动遍历在DriverEntry中的设备列表,并清除DO_DEVICE_INITIALIZING标志。但是WDM驱动中,设备对象是在DriverEntry返回后才创建的,所以I/O管理器不会自动清除该标志,驱动程序需要自己清除。

/* File Kmd.cpp By WzrterFX */ #include "Kmd.h" namespace Kmd { NTSTATUS Kmd::Create(PDRIVER_OBJECT driverObject) { NTSTATUS status = STATUS_UNSUCCESSFUL; UNICODE_STRING deviceName { }; RtlInitUnicodeString(&deviceName, L"\\Device\\Kmd"); status = IoCreateDevice( driverObject, NULL, &deviceName, FILE_DEVICE_UNKNOWN, FILE_DEVICE_SECURE_OPEN, FALSE, &_deviceObject ); if (!NT_SUCCESS(status)) { DbgPrintEx(0, 0, "Fatal, failed to create driver device.\n" ); return status; } UNICODE_STRING symbolicLink { }; RtlInitUnicodeString(&symbolicLink, L"\\DosDevices\\Kmd"); status = IoCreateSymbolicLink(&symbolicLink, &deviceName); if (!NT_SUCCESS(status)) { DbgPrintEx(0, 0, "Fatal, failed to establish driver link.\n" ); IoDeleteDevice(_deviceObject); return status; } SetFlag(_deviceObject->Flags, DO_BUFFERED_IO); driverObject->MajorFunction[IRP_MJ_CREATE] = [](PDEVICE_OBJECT, PIRP io) -> NTSTATUS { IoCompleteRequest(io, IO_NO_INCREMENT); return io->IoStatus.Status; }; driverObject->MajorFunction[IRP_MJ_CLOSE] = [](PDEVICE_OBJECT, PIRP io) -> NTSTATUS { IoCompleteRequest(io, IO_NO_INCREMENT); return io->IoStatus.Status; }; driverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = &this->KmdControl; ClearFlag(_deviceObject->Flags, DO_DEVICE_INITIALIZING); return STATUS_SUCCESS; } NTSTATUS Kmd::KmdControl(PDEVICE_OBJECT, PIRP io) { NTSTATUS status = STATUS_UNSUCCESSFUL; PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(io); if (!stack) { IoCompleteRequest(io, IO_NO_INCREMENT); DbgPrintEx(0, 0, "Fatal, missing driver stack location.\n" ); return status; } PKmdRequest request = reinterpret_cast<PKmdRequest>(io->AssociatedIrp.SystemBuffer); if (!request) { IoCompleteRequest(io, IO_NO_INCREMENT); DbgPrintEx(0, 0, "Fatal, missing driver associated request.\n" ); return status; } static PEPROCESS process { }; static SIZE_T reserved { }; switch (stack->Parameters.DeviceIoControl.IoControlCode) { case ::Kmd::_IoCtls::attach: { status = ::Kmd::_NtifsApi::PsLookupProcessByProcessId( request->attachRequest.process, &process ); break; } case ::Kmd::_IoCtls::read: { if (process) { status = ::Kmd::_NtifsApi::MmCopyVirtualMemory( process, request->copyMemoryRequest.from, PsGetCurrentProcess(), request->copyMemoryRequest.to, request->copyMemoryRequest.requested, MODE::KernelMode, &reserved ); } break; } case ::Kmd::_IoCtls::write: { if (process) { status = ::Kmd::_NtifsApi::MmCopyVirtualMemory( PsGetCurrentProcess(), request->copyMemoryRequest.to, process, request->copyMemoryRequest.from, request->copyMemoryRequest.requested, MODE::KernelMode, &reserved ); } break; } default: { status = STATUS_INVALID_DEVICE_REQUEST; break; } } io->IoStatus.Status = status; io->IoStatus.Information = sizeof(KmdRequest); IoCompleteRequest(io, IO_NO_INCREMENT); return status; } }帮我全部加上注释
最新发布
03-22
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