张帆的《Windows 驱动开发技术详解》中有一个U盘过滤驱动,实现U盘的只读锁定。我想在某种情况下实现U盘的读写锁定。因为我想做一个密码的判断,所以不可能手动对注册表修改来实现这个功能。运行实例代码是好的。但是我加了一个对读操作请求的处理,然后Windows7 32bit测试机立刻蓝屏。代码如下:
NTSTATUS
USBSCSICompletion( IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Context )
{
PDEVICE_EXTENSION pdx = ( PDEVICE_EXTENSION )
DeviceObject->DeviceExtension;
IoAcquireRemoveLock(&pdx->RemoveLock,Irp);
PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation( Irp );
PSCSI_REQUEST_BLOCK CurSrb=irpStack->Parameters.Scsi.Srb;
PCDB cdb = (PCDB)CurSrb->Cdb;
UCHAR opCode=cdb->CDB6GENERIC.OperationCode;
if(opCode==SCSIOP_MODE_SENSE && CurSrb->DataBuffer
&& CurSrb->DataTransferLength >=
sizeof(MODE_PARAMETER_HEADER))
{
KdPrint(("SCSIOP_MODE_SENSE comming!\n"));
PMODE_PARAMETER_HEADER modeData = (PMODE_PARAMETER_HEADER)CurSrb->DataBuffer;
modeData->DeviceSpecificParameter |= MODE_DSP_WRITE_PROTECT;
}
if (opCode == SCSIOP_READ)
{
Irp->IoStatus.Status = STATUS_INVALID_DEVICE_REQUEST;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
}
if ( Irp->PendingReturned )
{
IoMarkIrpPending( Irp );
}
IoReleaseRemoveLock(&pdx->RemoveLock,Irp);
return Irp->IoStatus.Status ;
}
蓝屏log
PFN_LIST_CORRUPT (4e)
Typically caused by drivers passing bad memory descriptor lists (ie: calling
MmUnlockPages twice with the same list, etc). If a kernel debugger is
available get the stack trace.
Arguments:
Arg1: 00000007, A driver has unlocked a page more times than it locked it
Arg2: 0007e861, page frame number
Arg3: 00000001, current share count
Arg4: 00000000, 0
貌似是写锁定和 读锁定两个的方法冲突了。
还请大神指点指点!谢谢!