How many times has the question been asked and answered? Care to try
for a guess? Read about 'context'.
Why use an Ioctl to do a read? There are read and write requests
defined already. They have specific access checks with standard
implementation rules and trying to reinvent the wheel is not a good use
of time and resources. I don't see a buffer for the Ioctl read to
provide data.
"Steffen" <anonym...anonymnospam.com> wrote in message
news:%2308C%23Pj0DHA.1576...TK2MSFTNGP11.phx.gbl...
> I have written a device driver and I have a problem with ZwCreateFile
and
> ZwReadFile.
> ZwReadFile always returns STATUS_INVALID_HANDLE in DriverIOControl.
>
> The DriveEntry opens a file with ZwCreateFile.
> #pragma alloc_text(INIT,DriverEntry)
> #pragma alloc_text(PAGE,DriverCreateClose)
> #pragma alloc_text(PAGE,DriverIOControl)
> #pragma alloc_text(PAGE,DriverUnload)
>
> typedef struct _DEVICE_EXTENSION {
> HANDLE filehandle;
> } DEVICE_EXTENSION, *PDEVICE_EXTENSION;
>
> NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject,IN PUNICODE_STRING
> RegistryPath)
> {
> ...
> NTSTATUS status;
> IO_STATUS_BLOCK info;
> UNICODE_STRING ucfilename;
> OBJECT_ATTRIBUTES objectattributes;
> WCHAR filename[]=L"\\'\\L:\\test.dat";
> DbgPrint("DriveEntry:\n");
> ...
>
status=IoCreateDevice(DriverObject,sizeof(DEVICE_EXTENSION),&ucdevicenam
e,FI
> LE_DEVICE_UNKNOWN,0,false,&deviceobject);
> ...
> status=IoCreateSymbolicLink(&ucdevicelink,&ucdevicename);
> ...
> deviceextension=(PDEVICE_EXTENSION) deviceobject->DeviceExtension;
> deviceextension->filehandle=NULL;
> deviceobject->Flags |= DO_DIRECT_IO;
> ...
> RtlInitUnicodeString(&ucfilename,filename);
>
InitializeObjectAttributes(&objectattributes,&ucfilename,OBJ_CASE_INSENS
ITIV
> E,NULL,NULL);
>
status=ZwCreateFile(&deviceextension->filehandle,GENERIC_READ,&objectatt
ribu
> tes,&info,
> NULL, 0, FILE_SHARE_READ,
> FILE_OPEN,FILE_SYNCHRONOUS_IO_NONALERT,NULL,0);
> ...
> DriverObject->MajorFunction[IRP_MJ_CREATE] =DriverCreateClose;
> DriverObject->MajorFunction[IRP_MJ_CLOSE] =DriverCreateClose;
> DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = DriverIOControl;
> DriverObject->DriverUnload = DriverUnload;
> return STATUS_SUCCESS;
> }
> NTSTATUS DriverCreateClose(IN PDEVICE_OBJECT DeviceObject,IN PIRP Irp)
> {
> DbgPrint("DriveCreateClose:\n");
> Irp->IoStatus.Status=STATUS_SUCCESS;
> Irp->IoStatus.Information=0;
> IoCompleteRequest(Irp,IO_NO_INCREMENT);
> return STATUS_SUCCESS;
> }
> VOID DriverUnload(IN PDRIVER_OBJECT DriverObject)
> {
> PDEVICE_EXTENSION deviceextension;
> PDEVICE_OBJECT deviceobject;
> DbgPrint("DriveUnload:\n");
> deviceobject=DriverObject->DeviceObject;
> deviceextension=(PDEVICE_EXTENSION) deviceobject->DeviceExtension;
> ZwCloseHandle(deviceextension->filehandle);
> return;
> }
>
> In DriverIOControl I have programmed a new IoControlCode.
> #define FILE_DEVICE_FILE 0x8000
> #define IOCTL_FILE_READ
CTL_CODE(FILE_DEVICE_FILE,0x800,METHOD_BUFFERED,
> FILE_READ_ACCESS|FILE_WRITE_ACCESS)
> NTSTATUS DriverIOControl(IN PDEVICE_OBJECT DeviceObject,IN PIRP Irp)
> {
> PDEVICE_EXTENSION deviceextension;
> PIO_STACK_LOCATION iostack;
> IO_STATUS_BLOCK stat;
> LARGE_INTEGER ofs;
> NTSTATUS status;
> char rbuf[20];
>
> DbgPrint("DriverIOControl:\n");
> deviceextension=(PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
> iostack=IoGetCurrentIrpStackLocation(Irp);
> switch (iostack->Parameters.DeviceIoControl.IoControlCode)
> {
> case IOCTL_FILE_READ:
> {
> ofs.QuadPart=0;
> status=ZwReadFile(deviceextension->filehandle,NULL,NULL,NULL,
> &stat,&rbuf[0],10,&ofs,NULL);
> if (status==STATUS_SUCCESS) {
> DbgPrint(" INFO: data readed\n");
> status=STATUS_SUCCESS;
> Irp->IoStatus.Information=0;
> }
> else if (status==STATUS_INVALID_HANDLE)
> DbgPrint(" ERROR: status_invalid_handle\n");
> else DbgPrint(" ERROR: other
error\n");
> }
> break;
> default:
> {
> DbgPrint(" ERROR: invalid device
request\n");
> status=INVALID_DEVICE_REQUEST;
> }
> break;
> }
>
> Irp->IoStatus.Status=status;
> Irp->IoStatus.Information=0;
> IoCompleteRequest(Irp,IO_NO_INCREMENT);
> return status;
> }
>
> In my user program I use CreateFile to connect to the driver and
> DeviceIoControl
> to send a IOCTL message.
> HANDLE driver;
> DWORD dwSize=0;
> ...
> driver=CreateFile("\\\\.\\mydriver",GENERIC_READ | GENERIC_WRITE,
> FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
> OPEN_EXISTING,
> FILE_FLAG_NO_BUFFERING, NULL);
> ...
>
ret=DeviceIoControl(driver,IOCTL_VDISK_READ,NULL,0,NULL,dwSize,&dwSize,N
ULL)
> ;
> ...
> CloseHandle(driver);
>
> ZwReadFile returns STATUS_INVALID_HANDLE all the time. But the
filehandle of
> the
> driverfile (L:\test.dat) is not closed. The driverfile is big enough
(10MB).
>
> The program Handle shows me that the driverfilehandle is allocated to
the
> system.
> Handle v2.10
> Copyright (C) 1997-2003 Mark Russinovich
> Sysinternals - www.sysinternals.com
> System pid: 4 L:\test.dat
>
> If I open a file in DriverIOControl the file will allocate to the user
> program.
> Handle v2.10
> Copyright (C) 1997-2003 Mark Russinovich
> Sysinternals - www.sysinternals.com
> control.exe pid: 252 L:\test.dat
> This handle is only available for this user program. After a new start
of
> the program
> I have to create a new handle.
>
> It seems that I have no access to the system handle in
DriverIOControl.
>
> How can I fix this problem without open the driverfile every
> IOCTL_VDISK_READ message?
>