}
}
+VOID
+NTAPI
+IopDoNameTransmogrify(IN PIRP Irp,
+ IN PFILE_OBJECT FileObject,
+ IN PREPARSE_DATA_BUFFER DataBuffer)
+{
+ PWSTR Buffer;
+ USHORT Length;
+ USHORT RequiredLength;
+ PWSTR NewBuffer;
+
+ PAGED_CODE();
+
+ ASSERT(Irp->IoStatus.Status == STATUS_REPARSE);
+ ASSERT(Irp->IoStatus.Information == IO_REPARSE_TAG_MOUNT_POINT);
+ ASSERT(Irp->Tail.Overlay.AuxiliaryBuffer != NULL);
+ ASSERT(DataBuffer != NULL);
+ ASSERT(DataBuffer->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT);
+ ASSERT(DataBuffer->ReparseDataLength < MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
+ ASSERT(DataBuffer->Reserved < MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
+
+ /* First of all, validate data */
+ if (DataBuffer->ReparseDataLength < REPARSE_DATA_BUFFER_HEADER_SIZE ||
+ (DataBuffer->SymbolicLinkReparseBuffer.PrintNameLength +
+ DataBuffer->SymbolicLinkReparseBuffer.SubstituteNameLength +
+ FIELD_OFFSET(REPARSE_DATA_BUFFER, MountPointReparseBuffer.PathBuffer[0])) > MAXIMUM_REPARSE_DATA_BUFFER_SIZE)
+ {
+ Irp->IoStatus.Status = STATUS_IO_REPARSE_DATA_INVALID;
+ }
+
+ /* Everything went right */
+ if (NT_SUCCESS(Irp->IoStatus.Status))
+ {
+ /* Compute buffer & length */
+ Buffer = (PWSTR)((ULONG_PTR)DataBuffer->MountPointReparseBuffer.PathBuffer +
+ DataBuffer->MountPointReparseBuffer.SubstituteNameOffset);
+ Length = DataBuffer->MountPointReparseBuffer.SubstituteNameLength;
+
+ /* Check we don't overflow */
+ if ((MAXUSHORT - DataBuffer->Reserved) <= (Length + sizeof(UNICODE_NULL)))
+ {
+ Irp->IoStatus.Status = STATUS_IO_REPARSE_DATA_INVALID;
+ }
+ else
+ {
+ /* Compute how much mem we'll need */
+ RequiredLength = DataBuffer->Reserved + Length + sizeof(UNICODE_NULL);
+
+ /* Check if FileObject can already hold what we need */
+ if (FileObject->FileName.MaximumLength >= RequiredLength)
+ {
+ NewBuffer = FileObject->FileName.Buffer;
+ }
+ else
+ {
+ /* Allocate otherwise */
+ NewBuffer = ExAllocatePoolWithTag(PagedPool, RequiredLength, TAG_IO_NAME);
+ if (NewBuffer == NULL)
+ {
+ Irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
+ }
+ }
+ }
+ }
+
+ /* Everything went right */
+ if (NT_SUCCESS(Irp->IoStatus.Status))
+ {
+ /* Copy reserved */
+ if (DataBuffer->Reserved)
+ {
+ RtlMoveMemory((PWSTR)((ULONG_PTR)NewBuffer + Length),
+ (PWSTR)((ULONG_PTR)FileObject->FileName.Buffer + FileObject->FileName.Length - DataBuffer->Reserved),
+ DataBuffer->Reserved);
+ }
+
+ /* Then, buffer */
+ if (Length)
+ {
+ RtlCopyMemory(NewBuffer, Buffer, Length);
+ }
+
+ /* And finally replace buffer if new one was allocated */
+ FileObject->FileName.Length = RequiredLength - sizeof(UNICODE_NULL);
+ if (NewBuffer != FileObject->FileName.Buffer)
+ {
+ if (FileObject->FileName.Buffer)
+ {
+ ExFreePoolWithTag(FileObject->FileName.Buffer, TAG_IO_NAME);
+ }
+
+ FileObject->FileName.Buffer = NewBuffer;
+ FileObject->FileName.MaximumLength = RequiredLength;
+ FileObject->FileName.Buffer[RequiredLength / sizeof(WCHAR) - 1] = UNICODE_NULL;
+ }
+ }
+
+ /* We don't need them anymore - it was allocated by the driver */
+ ExFreePool(DataBuffer);
+}
+
NTSTATUS
NTAPI
IopParseDevice(IN PVOID ParseObject,
/* Validate the open packet */
if (!IopValidateOpenPacket(OpenPacket)) return STATUS_OBJECT_TYPE_MISMATCH;
+ /* Valide reparse point in case we traversed a mountpoint */
+ if (OpenPacket->TraversedMountPoint)
+ {
+ /* This is a reparse point we understand */
+ ASSERT(OpenPacket->Information == IO_REPARSE_TAG_MOUNT_POINT);
+
+ /* Make sure we're dealing with correct DO */
+ if (OriginalDeviceObject->DeviceType != FILE_DEVICE_DISK &&
+ OriginalDeviceObject->DeviceType != FILE_DEVICE_CD_ROM &&
+ OriginalDeviceObject->DeviceType != FILE_DEVICE_VIRTUAL_DISK &&
+ OriginalDeviceObject->DeviceType != FILE_DEVICE_TAPE)
+ {
+ OpenPacket->FinalStatus = STATUS_IO_REPARSE_DATA_INVALID;
+ return STATUS_IO_REPARSE_DATA_INVALID;
+ }
+ }
+
/* Check if we have a related file object */
if (OpenPacket->RelatedFileObject)
{
/* Check if we can simply use a dummy file */
UseDummyFile = ((OpenPacket->QueryOnly) || (OpenPacket->DeleteOnly));
+#if 1
/* FIXME: Small hack still exists, have to check why...
* This is triggered multiple times by usetup and then once per boot.
*/
WRITE_DAC));
DirectOpen = TRUE;
}
+#endif
/* Check if this is a direct open */
if (!(RemainingName->Length) &&
}
}
+ /* If we traversed a mount point, reset the information */
+ if (OpenPacket->TraversedMountPoint)
+ {
+ OpenPacket->TraversedMountPoint = FALSE;
+ }
+
/* Check if this is a secure FSD */
if ((DeviceObject->Characteristics & FILE_DEVICE_SECURE_OPEN) &&
((OpenPacket->RelatedFileObject) || (RemainingName->Length)) &&
ASSERT(!Irp->PendingReturned);
ASSERT(!Irp->MdlAddress);
+ /* Handle name change if required */
+ if (Status == STATUS_REPARSE)
+ {
+ /* Check this is a mount point */
+ if (Irp->IoStatus.Information == IO_REPARSE_TAG_MOUNT_POINT)
+ {
+ PREPARSE_DATA_BUFFER ReparseData;
+
+ /* Reparse point attributes were passed by the driver in the auxiliary buffer */
+ ASSERT(Irp->Tail.Overlay.AuxiliaryBuffer != NULL);
+ ReparseData = (PREPARSE_DATA_BUFFER)Irp->Tail.Overlay.AuxiliaryBuffer;
+
+ ASSERT(ReparseData->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT);
+ ASSERT(ReparseData->ReparseDataLength < MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
+ ASSERT(ReparseData->Reserved < MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
+
+ IopDoNameTransmogrify(Irp, FileObject, ReparseData);
+ }
+ }
+
/* Completion happens at APC_LEVEL */
KeRaiseIrql(APC_LEVEL, &OldIrql);
}
else if (Status == STATUS_REPARSE)
{
- /* FIXME: We don't handle this at all! */
+ if (OpenPacket->Information == IO_REPARSE ||
+ OpenPacket->Information == IO_REPARSE_TAG_MOUNT_POINT)
+ {
+ /* Update CompleteName with reparse info which got updated in IopDoNameTransmogrify() */
+ if (CompleteName->MaximumLength < FileObject->FileName.Length)
+ {
+ PWSTR NewCompleteName;
+
+ /* Allocate a new buffer for the string */
+ NewCompleteName = ExAllocatePoolWithTag(PagedPool, FileObject->FileName.Length, TAG_IO_NAME);
+ if (NewCompleteName == NULL)
+ {
+ OpenPacket->FinalStatus = STATUS_INSUFFICIENT_RESOURCES;
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ /* Release the old one */
+ if (CompleteName->Buffer != NULL)
+ {
+ ExFreePoolWithTag(CompleteName->Buffer, TAG_IO_NAME);
+ }
+
+ /* And setup the new one */
+ CompleteName->Buffer = NewCompleteName;
+ CompleteName->MaximumLength = FileObject->FileName.Length;
+ }
+
+ /* Copy our new complete name */
+ RtlCopyUnicodeString(CompleteName, &FileObject->FileName);
+
+ if (OpenPacket->Information == IO_REPARSE_TAG_MOUNT_POINT)
+ {
+ OpenPacket->RelatedFileObject = NULL;
+ }
+ }
+
+ /* Check if we have a name */
+ if (FileObject->FileName.Length)
+ {
+ /* Free it */
+ ExFreePoolWithTag(FileObject->FileName.Buffer, TAG_IO_NAME);
+ FileObject->FileName.Length = 0;
+ }
+
+ /* Clear its device object */
+ FileObject->DeviceObject = NULL;
+
+ /* Clear the file object in the open packet */
+ OpenPacket->FileObject = NULL;
+
+ /* Dereference the file object */
+ if (!UseDummyFile) ObDereferenceObject(FileObject);
+
+ /* Dereference the device object */
+ IopDereferenceDeviceObject(OriginalDeviceObject, FALSE);
+
+ /* Unless the driver cancelled the open, dereference the VPB */
+ if (Vpb != NULL) IopDereferenceVpbAndFree(Vpb);
+
+ if (OpenPacket->Information != IO_REMOUNT)
+ {
+ OpenPacket->RelatedFileObject = NULL;
+
+ /* Inform we traversed a mount point for later attempt */
+ if (OpenPacket->Information == IO_REPARSE_TAG_MOUNT_POINT)
+ {
+ OpenPacket->TraversedMountPoint = 1;
+ }
+
+ /* In case we override checks, but got this on volume open, fail hard */
+ if (OpenPacket->Override)
+ {
+ KeBugCheckEx(DRIVER_RETURNED_STATUS_REPARSE_FOR_VOLUME_OPEN,
+ (ULONG_PTR)OriginalDeviceObject,
+ (ULONG_PTR)DeviceObject,
+ (ULONG_PTR)CompleteName,
+ OpenPacket->Information);
+ }
+
+ /* Return to IO/OB so that information can be upgraded */
+ return STATUS_REPARSE;
+ }
+
+ /* FIXME: At that point, we should loop again and reattempt an opening */
ASSERT(FALSE);
}
projects / reactos.git / blobdiff