使用IRP进行文件操作 

一个通用IRP访问文件的十六进制编辑器(开源代码)     --   被诅咒的神(邪恶八进制信息安全团队)

Windows平台内核级文件访问                               --   baiyuanfan (baiyuanfan@163.com)

这里有个重点,我引用<Windows平台内核级文件访问>里面的一段话:

文件系统过滤驱动Attach在正常的文件系统之上，监视和过滤我们的文件访问。文件系统驱动栈就是由这一连串的Attach起来的过滤驱动组成。我们可以用IoGetRelatedDeviceObject这个函数来获得一个FileObject对应的最底层的那个功能驱动对象(FDO)。但是这样虽然绕过了那些过滤驱动，却同时也绕过了正常的FSD如Ntfs/Fastfat，因为正常的FSD也是作为一个过滤驱动存在的。磁盘文件对象的对应的最底层的FDO是Ftdisk.sys，它已经因为过于底层而不能处理我们投递的IRP请求。
   其实正常的FSD信息存储在一个Vpb结构中，我们可以使用IoGetBaseFileSystemDeviceObject这个未公开的内核函数来得到它。它就是我们发送IRP的目标了。

但既然是在Vpb里面有正常的FSD,我就直接用了,以免调用了被hook的函数.知道文件过滤驱动原理就可以知道这样做可以绕过栈顶的驱动直接发送IRP到正常FSD.这点很重要.

如果发现这里面的函数调用会产生蓝屏,而确认您的传入参数准确无误,那么请在这里留言给我,谢谢.

#include "ntifs.h"

//

//  Define the structure used by this driver module.

//

typedef struct _AUX_ACCESS_DATA {

     PPRIVILEGE_SET PrivilegesUsed;

     GENERIC_MAPPING GenericMapping;

     ACCESS_MASK AccessesToAudit;

     ULONG Reserve;                            //unknow...

} AUX_ACCESS_DATA, *PAUX_ACCESS_DATA;

//

//  Define the local routines used by this driver module.

//

NTSTATUS

ObCreateObject (

     IN KPROCESSOR_MODE ProbeMode,

     IN POBJECT_TYPE ObjectType,

     IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL,

     IN KPROCESSOR_MODE OwnershipMode,

     IN OUT PVOID ParseContext OPTIONAL,

     IN ULONG ObjectBodySize,

     IN ULONG PagedPoolCharge,

     IN ULONG NonPagedPoolCharge,

     OUT PVOID *Object

     );

NTSTATUS

SeCreateAccessState(

     IN PACCESS_STATE AccessState,

     IN PAUX_ACCESS_DATA AuxData,

     IN ACCESS_MASK DesiredAccess,

     IN PGENERIC_MAPPING GenericMapping OPTIONAL

     );

//

// IoCompletionRoutine

//

// This routine is used to handle I/O (read OR write) completion

//

// Inputs:

// DeviceObject - not used

// Irp - the I/O operation being completed

// Context - not used

//

// Outputs:

// None.

//

// Returns:

// STATUS_MORE_PROCESSING_REQUIRED

//

// Notes:

// The purpose of this routine is to do "cleanup" on I/O operations

// so we don‘t constantly throw away perfectly good MDLs as part of

// completion processing.

//

NTSTATUS

IoCompletionRoutine(

     IN PDEVICE_OBJECT DeviceObject,

     IN PIRP Irp,

     IN PVOID Context

     );

//

// IrpCreateFile

//

// This routine is used as NtCreateFile but first and third parameter.

//

// Inputs:

// DesiredAccess - Specifies an ACCESS_MASK value that determines

//                     the requested access to the object.

// FilePath - Path of file to create,as L"C://Windows"(Unicode).

// AllocationSize - Pointer to a LARGE_INTEGER that contains the initial allocation

//                     size, in bytes, for a file that is created or overwritten.

// FileAttributes - Specifies one or more FILE_ATTRIBUTE_XXX flags, which represent

//                     the file attributes to set if you are creating or overwriting a file.

// ShareAccess - Type of share access.

// CreateDisposition - Specifies the action to perform if the file does or does not exist.

// CreateOptions - Specifies the options to apply when creating or opening the file.

// EaBuffer - For device and intermediate drivers, this parameter must be a NULL pointer.

// EaLength - For device and intermediate drivers, this parameter must be zero.

//

// Ouputs:

// FileObject - Pointer to a PFILE_OBJECT variable that

//                 receives a PFILE_OBJECT to the file.

// IoStatusBlock - Pointer to an IO_STATUS_BLOCK structure that receives the final

//                 completion status and information about the requested read operation.

//

// Returns:

// The IRP send status.

//

// Notes:

// This is equivalent to NtCreateFile,but return FILE_OBJECT not HANDLE.

//

NTSTATUS

IrpCreateFile(

     OUT PFILE_OBJECT  *FileObject,

     IN ACCESS_MASK  DesiredAccess,

     IN PUNICODE_STRING  FilePath,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     IN PLARGE_INTEGER  AllocationSize OPTIONAL,

     IN ULONG  FileAttributes,

     IN ULONG  ShareAccess,

     IN ULONG  CreateDisposition,

     IN ULONG  CreateOptions,

     IN PVOID  EaBuffer OPTIONAL,

     IN ULONG  EaLength

     );

//

// IrpClose

//

// This routine is used as ObDereferenceObject.

//

// Inputs:

// FileObject - Pointer to a PFILE_OBJECT variable that will close

//

// Ouputs:

// IoStatusBlock - Pointer to an IO_STATUS_BLOCK structure that receives the final

//                 completion status and information about the requested read operation.

//

// Returns:

// The IRP send status.

//

// Notes:

// This is equivalent to ObDereferenceObject

//

NTSTATUS

IrpClose(

     IN PFILE_OBJECT  FileObject

     );

//

// IrpQueryDirectoryFile

//

// This routine is used as NtQueryDirectoryFile.

//

// Inputs:

// FileObject - Pointer to a PFILE_OBJECT.

// Length - Size, in bytes, of the buffer pointed to by FileInformation. The caller

//            should set this parameter according to the given FileInformationClass.

// FileInformationClass - Type of information to be returned about files in the directory.

// FileName - Pointer to a caller-allocated Unicode string containing the name of a file

//            (or multiple files, if wildcards are used) within the directory specified by FileHandle.

//            This parameter is optional and can be NULL.

//

// Ouputs:

// IoStatusBlock - Pointer to an IO_STATUS_BLOCK structure that receives the final

//                 completion status and information about the requested read operation.

// FileInformation - Pointer to a buffer that receives the desired

//                          information about the file.

//

// Returns:

// The IRP send status.

//

// Notes:

// This is equivalent to NtQueryDirectoryFile, but no ApcRoutine.

//

NTSTATUS

IrpQueryDirectoryFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     OUT PVOID  FileInformation,

     IN ULONG  Length,

     IN FILE_INFORMATION_CLASS  FileInformationClass,

     IN PUNICODE_STRING  FileName  OPTIONAL

     );

//

// IrpQueryInformationFile

//

// This routine is used as NtQueryInformationFile.

//

// Inputs:

// FileObject - Pointer to a PFILE_OBJECT.

// Length - Size, in bytes, of the buffer pointed to by FileInformation. The caller

//            should set this parameter according to the given FileInformationClass.

// FileInformationClass - Type of information to be returned about files in the directory.

//

// Ouputs:

// IoStatusBlock - Pointer to an IO_STATUS_BLOCK structure that receives the final

//                 completion status and information about the requested read operation.

// FileInformation - Pointer to a buffer that receives the desired

//                          information about the file.

//

// Returns:

// The IRP send status.

//

// Notes:

// This is equivalent to NtQueryInformationFile.

//

NTSTATUS

IrpQueryInformationFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     OUT PVOID  FileInformation,

     IN ULONG  Length,

     IN FILE_INFORMATION_CLASS  FileInformationClass

     );

//

// IrpSetInformationFile

//

// This routine is used as NtSetInformationFile.

//

// Inputs:

// FileObject - Pointer to a PFILE_OBJECT.

// FileInformation - Pointer to a buffer that contains the information to set for the file. 

// Length - Size, in bytes, of the buffer pointed to by FileInformation. The caller

//            should set this parameter according to the given FileInformationClass.

// FileInformationClass - Type of information to be returned about files in the directory.

// ReplaceIfExists - Set to TRUE to specify that if a file with the same name already exists,

//                     it should be replaced with the given file. Set to FALSE if the rename

//                     operation should fail if a file with the given name already exists.

//

// Ouputs:

// IoStatusBlock - Pointer to an IO_STATUS_BLOCK structure that receives the final

//                 completion status and information about the requested read operation.

//

// Returns:

// The IRP send status.

//

// Notes:

// This is equivalent to NtSetInformationFile.

//

NTSTATUS

IrpSetInformationFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     IN PVOID  FileInformation,

     IN ULONG  Length,

     IN FILE_INFORMATION_CLASS  FileInformationClass,

     IN BOOLEAN  ReplaceIfExists

     );

//

// IrpReadFile

//

// This routine is used as NtReadFile.

//

// Inputs:

// FileObject - Pointer to a PFILE_OBJECT.

// Buffer - Pointer to a caller-allocated buffer that receives the data read from the file.

// Length - The size, in bytes, of the buffer pointed to by Buffer.

// ByteOffset - Pointer to a variable that specifies the starting byte offset

//                 in the file where the read operation will begin.

//

// Ouputs:

// IoStatusBlock - Pointer to an IO_STATUS_BLOCK structure that receives the final

//                completion status and information about the requested read operation.

//

// Returns:

// The IRP send status.

//

// Notes:

// This is equivalent to NtReadFile, but no ApcRoutine.

//

NTSTATUS

IrpReadFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     OUT PVOID  Buffer,

     IN ULONG  Length,

     IN PLARGE_INTEGER  ByteOffset  OPTIONAL

     );

//

// IrpReadFile

//

// This routine is used as NtReadFile.

//

// Inputs:

// FileObject - Pointer to a PFILE_OBJECT.

// Buffer - Pointer to a caller-allocated buffer that contains the data to write to the file.

// Length - The size, in bytes, of the buffer pointed to by Buffer.

// ByteOffset - Pointer to a variable that specifies the starting byte offset

//                 in the file for beginning the write operation.

//

// Ouputs:

// IoStatusBlock - Pointer to an IO_STATUS_BLOCK structure that receives the final

//                 completion status and information about the requested read operation.

//

// Returns:

// The IRP send status.

//

// Notes:

// This is equivalent to NtReadFile, but no ApcRoutine.

//

NTSTATUS

IrpWriteFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     IN PVOID  Buffer,

     IN ULONG  Length,

     IN PLARGE_INTEGER  ByteOffset  OPTIONAL

     );

//

// Function start.

//

NTSTATUS

IoCompletionRoutine(

     IN PDEVICE_OBJECT DeviceObject,

     IN PIRP Irp,

     IN PVOID Context)

{

     *Irp->UserIosb = Irp->IoStatus;

     if (Irp->UserEvent)

         KeSetEvent(Irp->UserEvent, IO_NO_INCREMENT, 0);

     if (Irp->MdlAddress)

     {

         IoFreeMdl(Irp->MdlAddress);

         Irp->MdlAddress = NULL;

     }

     IoFreeIrp(Irp);

     return STATUS_MORE_PROCESSING_REQUIRED;

}

NTSTATUS

IrpCreateFile(

     OUT PFILE_OBJECT  *FileObject,

     IN ACCESS_MASK  DesiredAccess,

     IN PUNICODE_STRING  FilePath,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     IN PLARGE_INTEGER  AllocationSize  OPTIONAL,

     IN ULONG  FileAttributes,

     IN ULONG  ShareAccess,

     IN ULONG  CreateDisposition,

     IN ULONG  CreateOptions,

     IN PVOID  EaBuffer  OPTIONAL,

     IN ULONG  EaLength)

{

     NTSTATUS ntStatus;

     HANDLE hFile;

     PFILE_OBJECT pFile, _FileObject;

     UNICODE_STRING UniDeviceNameString;

    OBJECT_ATTRIBUTES ObjectAttributes;

     PDEVICE_OBJECT DeviceObject, RealDevice;

     PIRP Irp;

     KEVENT kEvent;

     PIO_STACK_LOCATION IrpSp;

     ACCESS_STATE AccessState;

     AUX_ACCESS_DATA AuxData;

     IO_SECURITY_CONTEXT SecurityContext;

     if(FilePath->Length < 6)

         return STATUS_INVALID_PARAMETER;

     RtlInitUnicodeString( &UniDeviceNameString, L"//DosDevices//*://" );

     UniDeviceNameString.Buffer[12] = FilePath->Buffer[0];

     InitializeObjectAttributes(&ObjectAttributes, &UniDeviceNameString, OBJ_KERNEL_HANDLE, NULL, NULL);

     ntStatus = IoCreateFile(&hFile,

                                 GENERIC_READ|SYNCHRONIZE,

                                 &ObjectAttributes,

                                 IoStatusBlock,

                                 NULL,

                                 FILE_ATTRIBUTE_NORMAL,

                                 FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,

                                 FILE_OPEN,

                                 FILE_SYNCHRONOUS_IO_NONALERT,

                                 NULL,

                                 0,

                                 CreateFileTypeNone,

                                 NULL,

                                 IO_NO_PARAMETER_CHECKING);

     if(!NT_SUCCESS(ntStatus)) return ntStatus;

     ntStatus = ObReferenceObjectByHandle(hFile,

                                                FILE_READ_ACCESS, // ACCESS_MASK

                                                *IoFileObjectType,

                                                KernelMode,

                                                &pFile,

                                                0);

     NtClose(hFile);

     if(!NT_SUCCESS(ntStatus)) return ntStatus;

     DeviceObject = pFile->Vpb->DeviceObject;

     RealDevice = pFile->Vpb->RealDevice;

     ObDereferenceObject(pFile);

     InitializeObjectAttributes(&ObjectAttributes, NULL, OBJ_CASE_INSENSITIVE, 0, NULL);

     ntStatus = ObCreateObject(KernelMode,

                                   *IoFileObjectType,

                                   &ObjectAttributes,

                                   KernelMode,

                                   NULL,

                                   sizeof(FILE_OBJECT),

                                   0,

                                   0,

                                   &_FileObject);

     if (!NT_SUCCESS(ntStatus)) return ntStatus;

     Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);

     if(Irp == NULL)

     {

         ObDereferenceObject(_FileObject);

         return STATUS_INSUFFICIENT_RESOURCES;

     }

     KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);

     RtlZeroMemory(_FileObject, sizeof(FILE_OBJECT));

     _FileObject->Type = IO_TYPE_FILE;

     _FileObject->Size = sizeof(FILE_OBJECT);

     _FileObject->DeviceObject = RealDevice;

     _FileObject->Flags = FO_SYNCHRONOUS_IO;

     RtlInitUnicodeString( &_FileObject->FileName, &FilePath->Buffer[2]);

     KeInitializeEvent(&_FileObject->Lock, SynchronizationEvent, FALSE);

     KeInitializeEvent(&_FileObject->Event, NotificationEvent, FALSE);

     RtlZeroMemory(&AuxData, sizeof(AUX_ACCESS_DATA));

     ntStatus = SeCreateAccessState( &AccessState,

                                          &AuxData,

                                          DesiredAccess,

                                          IoGetFileObjectGenericMapping());

     if (!NT_SUCCESS(ntStatus))

     {

         IoFreeIrp(Irp);

         ObDereferenceObject(_FileObject);

         return ntStatus;

     }

     SecurityContext.SecurityQos = NULL;

     SecurityContext.AccessState = &AccessState;

     SecurityContext.DesiredAccess = DesiredAccess;

     SecurityContext.FullCreateOptions = 0;

     Irp->MdlAddress = NULL;

     Irp->AssociatedIrp.SystemBuffer = EaBuffer;

     Irp->Flags = IRP_CREATE_OPERATION|IRP_SYNCHRONOUS_API;

     Irp->RequestorMode = KernelMode;

     Irp->UserIosb = IoStatusBlock;

     Irp->UserEvent = &kEvent;

     Irp->PendingReturned = FALSE;

     Irp->Cancel = FALSE;

     Irp->CancelRoutine = NULL;

     Irp->Tail.Overlay.Thread = PsGetCurrentThread();

     Irp->Tail.Overlay.AuxiliaryBuffer = NULL;

     Irp->Tail.Overlay.OriginalFileObject = _FileObject;

     IrpSp = IoGetNextIrpStackLocation(Irp);

     IrpSp->MajorFunction = IRP_MJ_CREATE;

     IrpSp->DeviceObject = DeviceObject;

     IrpSp->FileObject = _FileObject;

     IrpSp->Parameters.Create.SecurityContext = &SecurityContext;

     IrpSp->Parameters.Create.Options = (CreateDisposition << 24) | CreateOptions;

     IrpSp->Parameters.Create.FileAttributes = (USHORT)FileAttributes;

     IrpSp->Parameters.Create.ShareAccess = (USHORT)ShareAccess;

     IrpSp->Parameters.Create.EaLength = EaLength;

     IoSetCompletionRoutine(Irp, IoCompletionRoutine, 0, TRUE, TRUE, TRUE);

     ntStatus = IoCallDriver(DeviceObject, Irp);

     if(ntStatus == STATUS_PENDING)

         KeWaitForSingleObject(&kEvent, Executive, KernelMode, TRUE, 0);

     ntStatus = IoStatusBlock->Status;

     if(!NT_SUCCESS(ntStatus))

     {

         _FileObject->DeviceObject = NULL;

         ObDereferenceObject(_FileObject);

     }

     else

     {

         InterlockedIncrement(&_FileObject->DeviceObject->ReferenceCount);

         if (_FileObject->Vpb)

              InterlockedIncrement(&_FileObject->Vpb->ReferenceCount);

         *FileObject = _FileObject;

     }

     return ntStatus;

}

NTSTATUS

IrpClose(

     IN PFILE_OBJECT  FileObject)

{

     NTSTATUS ntStatus;

     IO_STATUS_BLOCK  IoStatusBlock;

     PIRP Irp;

     KEVENT kEvent;

     PIO_STACK_LOCATION IrpSp;

     PDEVICE_OBJECT pBaseDeviceObject = FileObject->Vpb->DeviceObject;

     if (FileObject->Vpb == 0 || FileObject->Vpb->DeviceObject == NULL)

         return STATUS_UNSUCCESSFUL;

     Irp = IoAllocateIrp(FileObject->Vpb->DeviceObject->StackSize, FALSE);

     if(Irp == NULL) return STATUS_INSUFFICIENT_RESOURCES;

     KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);

     Irp->UserEvent = &kEvent;

     Irp->UserIosb = &IoStatusBlock;

     Irp->RequestorMode = KernelMode;

     Irp->Flags = IRP_CLOSE_OPERATION|IRP_SYNCHRONOUS_API;

     Irp->Tail.Overlay.Thread = PsGetCurrentThread();

     Irp->Tail.Overlay.OriginalFileObject = FileObject;

     IrpSp = IoGetNextIrpStackLocation(Irp);

     IrpSp->MajorFunction = IRP_MJ_CLEANUP;

     IrpSp->FileObject = FileObject;

     ntStatus = IoCallDriver(pBaseDeviceObject, Irp);

     if (ntStatus == STATUS_PENDING)

         KeWaitForSingleObject(&kEvent, Executive, KernelMode, FALSE, NULL);

     ntStatus = IoStatusBlock.Status;

     if(!NT_SUCCESS(ntStatus))

     {

         IoFreeIrp(Irp);

         return ntStatus;

     }

     KeClearEvent(&kEvent);

     IoReuseIrp(Irp , STATUS_SUCCESS);

     Irp->UserEvent = &kEvent;

     Irp->UserIosb = &IoStatusBlock;

     Irp->Tail.Overlay.OriginalFileObject = FileObject;

     Irp->Tail.Overlay.Thread = PsGetCurrentThread();

     Irp->AssociatedIrp.SystemBuffer = (PVOID)NULL;

     Irp->Flags = IRP_CLOSE_OPERATION|IRP_SYNCHRONOUS_API;

     IrpSp = IoGetNextIrpStackLocation(Irp);

     IrpSp->MajorFunction = IRP_MJ_CLOSE;

     IrpSp->FileObject = FileObject;

     if (FileObject->Vpb && !(FileObject->Flags & FO_DIRECT_DEVICE_OPEN))

     {

         InterlockedDecrement(&FileObject->Vpb->ReferenceCount);

         FileObject->Flags |= FO_FILE_OPEN_CANCELLED;

     }

     ntStatus = IoCallDriver(pBaseDeviceObject, Irp);

     if (ntStatus == STATUS_PENDING)

         KeWaitForSingleObject(&kEvent, Executive, KernelMode, FALSE, NULL);

     IoFreeIrp(Irp);

     ntStatus = IoStatusBlock.Status;

     return ntStatus;

}

NTSTATUS

IrpQueryDirectoryFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     OUT PVOID  FileInformation,

     IN ULONG  Length,

     IN FILE_INFORMATION_CLASS  FileInformationClass,

     IN PUNICODE_STRING  FileName  OPTIONAL)

{

     NTSTATUS ntStatus;

     PIRP Irp;

     KEVENT kEvent;

     PIO_STACK_LOCATION IrpSp;

     if (FileObject->Vpb == 0 || FileObject->Vpb->DeviceObject == NULL)

         return STATUS_UNSUCCESSFUL;

     Irp = IoAllocateIrp(FileObject->Vpb->DeviceObject->StackSize, FALSE);

     if(Irp == NULL) return STATUS_INSUFFICIENT_RESOURCES;

     KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);

     RtlZeroMemory(FileInformation, Length);

     Irp->UserEvent = &kEvent;

     Irp->UserIosb = IoStatusBlock;

     Irp->UserBuffer = FileInformation;

     Irp->Tail.Overlay.Thread = PsGetCurrentThread();

     Irp->Tail.Overlay.OriginalFileObject = FileObject;

     Irp->Overlay.AsynchronousParameters.UserApcRoutine = (PIO_APC_ROUTINE)NULL;

     IrpSp = IoGetNextIrpStackLocation(Irp);

     IrpSp->MajorFunction = IRP_MJ_DIRECTORY_CONTROL;

     IrpSp->MinorFunction = IRP_MN_QUERY_DIRECTORY;

     IrpSp->FileObject = FileObject;

     IrpSp->Flags = SL_RESTART_SCAN;

     IrpSp->Parameters.QueryDirectory.Length = Length;

     IrpSp->Parameters.QueryDirectory.FileName = FileName;

     IrpSp->Parameters.QueryDirectory.FileInformationClass = FileInformationClass;

     IoSetCompletionRoutine(Irp, IoCompletionRoutine, 0, TRUE, TRUE, TRUE);

     ntStatus = IoCallDriver(FileObject->Vpb->DeviceObject, Irp);

     if (ntStatus == STATUS_PENDING)

         KeWaitForSingleObject(&kEvent, Executive, KernelMode, TRUE, 0);

     return IoStatusBlock->Status;

}

NTSTATUS

IrpQueryInformationFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     OUT PVOID  FileInformation,

     IN ULONG  Length,

     IN FILE_INFORMATION_CLASS  FileInformationClass)

{

     NTSTATUS ntStatus;

     PIRP Irp;

     KEVENT kEvent;

     PIO_STACK_LOCATION IrpSp;

     if (FileObject->Vpb == 0 || FileObject->Vpb->DeviceObject == NULL)

         return STATUS_UNSUCCESSFUL;

     Irp = IoAllocateIrp(FileObject->Vpb->DeviceObject->StackSize, FALSE);

     if(Irp == NULL) return STATUS_INSUFFICIENT_RESOURCES;

     KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);

     RtlZeroMemory(FileInformation, Length);

     Irp->AssociatedIrp.SystemBuffer = FileInformation;

     Irp->UserEvent = &kEvent;

     Irp->UserIosb = IoStatusBlock;

     Irp->RequestorMode = KernelMode;

     Irp->Tail.Overlay.Thread = PsGetCurrentThread();

     Irp->Tail.Overlay.OriginalFileObject = FileObject;

     IrpSp = IoGetNextIrpStackLocation(Irp);

     IrpSp->MajorFunction = IRP_MJ_QUERY_INFORMATION;

     IrpSp->DeviceObject = FileObject->Vpb->DeviceObject;

     IrpSp->FileObject = FileObject;

     IrpSp->Parameters.QueryFile.Length = Length;

     IrpSp->Parameters.QueryFile.FileInformationClass = FileInformationClass;

     IoSetCompletionRoutine(Irp, IoCompletionRoutine, 0, TRUE, TRUE, TRUE);

     ntStatus = IoCallDriver(FileObject->Vpb->DeviceObject, Irp);

     if (ntStatus == STATUS_PENDING)

         KeWaitForSingleObject(&kEvent, Executive, KernelMode, TRUE, 0);

     return IoStatusBlock->Status;

}

NTSTATUS

IrpSetInformationFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     IN PVOID  FileInformation,

     IN ULONG  Length,

     IN FILE_INFORMATION_CLASS  FileInformationClass,

     IN BOOLEAN  ReplaceIfExists)

{

     NTSTATUS ntStatus;

     PIRP Irp;

     KEVENT kEvent;

     PIO_STACK_LOCATION IrpSp;

     if (FileObject->Vpb == 0 || FileObject->Vpb->DeviceObject == NULL)

         return STATUS_UNSUCCESSFUL;

     Irp = IoAllocateIrp(FileObject->Vpb->DeviceObject->StackSize, FALSE);

     if(Irp == NULL) return STATUS_INSUFFICIENT_RESOURCES;

     KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);

     Irp->AssociatedIrp.SystemBuffer = FileInformation;

     Irp->UserEvent = &kEvent;

     Irp->UserIosb = IoStatusBlock;

     Irp->RequestorMode = KernelMode;

     Irp->Tail.Overlay.Thread = PsGetCurrentThread();

     Irp->Tail.Overlay.OriginalFileObject = FileObject;

     IrpSp = IoGetNextIrpStackLocation(Irp);

     IrpSp->MajorFunction = IRP_MJ_SET_INFORMATION;

     IrpSp->DeviceObject = FileObject->Vpb->DeviceObject;

     IrpSp->FileObject = FileObject;

     IrpSp->Parameters.SetFile.ReplaceIfExists = ReplaceIfExists;

     IrpSp->Parameters.SetFile.FileObject = FileObject;

     IrpSp->Parameters.SetFile.AdvanceOnly = FALSE;

     IrpSp->Parameters.SetFile.Length = Length;

     IrpSp->Parameters.SetFile.FileInformationClass = FileInformationClass;

     IoSetCompletionRoutine(Irp, IoCompletionRoutine, 0, TRUE, TRUE, TRUE);

     ntStatus = IoCallDriver(FileObject->Vpb->DeviceObject, Irp);

     if (ntStatus == STATUS_PENDING)

         KeWaitForSingleObject(&kEvent, Executive, KernelMode, TRUE, 0);

     return IoStatusBlock->Status;

}

NTSTATUS

IrpReadFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     OUT PVOID  Buffer,

     IN ULONG  Length,

     IN PLARGE_INTEGER  ByteOffset  OPTIONAL)

{

     NTSTATUS ntStatus;

     PIRP Irp;

     KEVENT kEvent;

     PIO_STACK_LOCATION IrpSp;

     if (FileObject->Vpb == 0 || FileObject->Vpb->DeviceObject == NULL)

         return STATUS_UNSUCCESSFUL;

     if(ByteOffset == NULL)

     {

         if(!(FileObject->Flags & FO_SYNCHRONOUS_IO))

              return STATUS_INVALID_PARAMETER;

         ByteOffset = &FileObject->CurrentByteOffset;

     }

     Irp = IoAllocateIrp(FileObject->Vpb->DeviceObject->StackSize, FALSE);

     if(Irp == NULL) return STATUS_INSUFFICIENT_RESOURCES;

     RtlZeroMemory(Buffer, Length);

     if(FileObject->DeviceObject->Flags & DO_BUFFERED_IO)

     {

         Irp->AssociatedIrp.SystemBuffer = Buffer;

     }

     else if(FileObject->DeviceObject->Flags & DO_DIRECT_IO)

     {

         Irp->MdlAddress = IoAllocateMdl(Buffer, Length, 0, 0, 0);

         if (Irp->MdlAddress == NULL)

         {

              IoFreeIrp(Irp);

              return STATUS_INSUFFICIENT_RESOURCES;

         }

         MmBuildMdlForNonPagedPool(Irp->MdlAddress);

     }

     else

     {

         Irp->UserBuffer = Buffer;

     }

     KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);

     Irp->UserEvent = &kEvent;

     Irp->UserIosb = IoStatusBlock;

     Irp->RequestorMode = KernelMode;

     Irp->Flags = IRP_READ_OPERATION;

     Irp->Tail.Overlay.Thread = PsGetCurrentThread();

     Irp->Tail.Overlay.OriginalFileObject = FileObject;

     IrpSp = IoGetNextIrpStackLocation(Irp);

     IrpSp->MajorFunction = IRP_MJ_READ;

     IrpSp->MinorFunction = IRP_MN_NORMAL;

     IrpSp->DeviceObject = FileObject->Vpb->DeviceObject;

     IrpSp->FileObject = FileObject;

     IrpSp->Parameters.Read.Length = Length;

     IrpSp->Parameters.Read.ByteOffset = *ByteOffset;

     IoSetCompletionRoutine(Irp, IoCompletionRoutine, 0, TRUE, TRUE, TRUE);

     ntStatus = IoCallDriver(FileObject->Vpb->DeviceObject, Irp);

     if (ntStatus == STATUS_PENDING)

         KeWaitForSingleObject(&kEvent, Executive, KernelMode, TRUE, 0);

     return IoStatusBlock->Status;

}

NTSTATUS

IrpWriteFile(

     IN PFILE_OBJECT  FileObject,

     OUT PIO_STATUS_BLOCK  IoStatusBlock,

     IN PVOID  Buffer,

     IN ULONG  Length,

     IN PLARGE_INTEGER  ByteOffset  OPTIONAL)

{

     NTSTATUS ntStatus;

     PIRP Irp;

     KEVENT kEvent;

     PIO_STACK_LOCATION IrpSp;

     if (FileObject->Vpb == 0 || FileObject->Vpb->DeviceObject == NULL)

         return STATUS_UNSUCCESSFUL;

     if (ByteOffset == NULL)

     {

         if (!(FileObject->Flags & FO_SYNCHRONOUS_IO))

              return STATUS_INVALID_PARAMETER;

         ByteOffset = &FileObject->CurrentByteOffset;

     }

     Irp = IoAllocateIrp(FileObject->Vpb->DeviceObject->StackSize, FALSE);

     if (Irp == NULL) return STATUS_INSUFFICIENT_RESOURCES;

     if(FileObject->DeviceObject->Flags & DO_BUFFERED_IO)

     {

         Irp->AssociatedIrp.SystemBuffer = Buffer;

     }

     else

     {

         Irp->MdlAddress = IoAllocateMdl(Buffer, Length, 0, 0, 0);

         if (Irp->MdlAddress == NULL)

         {

              IoFreeIrp(Irp);

              return STATUS_INSUFFICIENT_RESOURCES;

         }

         MmBuildMdlForNonPagedPool(Irp->MdlAddress);

     }

     KeInitializeEvent(&kEvent, SynchronizationEvent, FALSE);

     Irp->UserEvent = &kEvent;

     Irp->UserIosb = IoStatusBlock;

     Irp->RequestorMode = KernelMode;

     Irp->Flags = IRP_WRITE_OPERATION;

     Irp->Tail.Overlay.Thread = PsGetCurrentThread();

     Irp->Tail.Overlay.OriginalFileObject = FileObject;

     IrpSp = IoGetNextIrpStackLocation(Irp);

     IrpSp->MajorFunction = IRP_MJ_WRITE;

     IrpSp->MinorFunction = IRP_MN_NORMAL;

     IrpSp->DeviceObject = FileObject->Vpb->DeviceObject;

     IrpSp->FileObject = FileObject;

     IrpSp->Parameters.Write.Length = Length;

     IrpSp->Parameters.Write.ByteOffset = *ByteOffset;

     IoSetCompletionRoutine(Irp, IoCompletionRoutine, NULL, TRUE, TRUE, TRUE);

     ntStatus = IoCallDriver(FileObject->Vpb->DeviceObject, Irp);

     if (ntStatus == STATUS_PENDING)

         KeWaitForSingleObject(&kEvent, Executive, KernelMode, TRUE, NULL);

     return IoStatusBlock->Status;

}