https://git.reactos.org/?p=reactos.git;a=commitdiff;h=779d87b48366a6941c394ef9dc1b19d4e2535d21
commit 779d87b48366a6941c394ef9dc1b19d4e2535d21
Author: Pierre Schweitzer <pie...@reactos.org>
AuthorDate: Fri Oct 5 10:45:21 2018 +0200
Commit: Pierre Schweitzer <pie...@reactos.org>
CommitDate: Fri Oct 5 10:49:59 2018 +0200
[NTOSKRNL] Implement IopCheckTopDeviceHint()
---
ntoskrnl/include/internal/io.h | 7 ++++++
ntoskrnl/io/iomgr/file.c | 48 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 55 insertions(+)
diff --git a/ntoskrnl/include/internal/io.h b/ntoskrnl/include/internal/io.h
index 8f0398b4ad..18a9b2de50 100644
--- a/ntoskrnl/include/internal/io.h
+++ b/ntoskrnl/include/internal/io.h
@@ -1299,6 +1299,13 @@ IopGetFileInformation(
OUT PULONG ReturnedLength
);
+BOOLEAN
+NTAPI
+IopVerifyDeviceObjectOnStack(
+ IN PDEVICE_OBJECT BaseDeviceObject,
+ IN PDEVICE_OBJECT TopDeviceObjectHint
+);
+
//
// I/O Timer Routines
//
diff --git a/ntoskrnl/io/iomgr/file.c b/ntoskrnl/io/iomgr/file.c
index a8da317317..c14e61806b 100644
--- a/ntoskrnl/io/iomgr/file.c
+++ b/ntoskrnl/io/iomgr/file.c
@@ -266,6 +266,54 @@ IopDoNameTransmogrify(IN PIRP Irp,
ExFreePool(DataBuffer);
}
+NTSTATUS
+IopCheckTopDeviceHint(IN OUT PDEVICE_OBJECT * DeviceObject,
+ IN POPEN_PACKET OpenPacket,
+ BOOLEAN DirectOpen)
+{
+ PDEVICE_OBJECT LocalDevice;
+ DEVICE_TYPE DeviceType;
+
+ LocalDevice = *DeviceObject;
+
+ /* Direct open is not allowed */
+ if (DirectOpen)
+ {
+ return STATUS_INVALID_PARAMETER;
+ }
+
+ /* Validate we have a file system device */
+ DeviceType = LocalDevice->DeviceType;
+ if (DeviceType != FILE_DEVICE_DISK_FILE_SYSTEM &&
+ DeviceType != FILE_DEVICE_CD_ROM_FILE_SYSTEM &&
+ DeviceType != FILE_DEVICE_TAPE_FILE_SYSTEM &&
+ DeviceType != FILE_DEVICE_NETWORK_FILE_SYSTEM &&
+ DeviceType != FILE_DEVICE_DFS_FILE_SYSTEM)
+ {
+ return STATUS_INVALID_PARAMETER;
+ }
+
+ /* Verify the hint and if it's OK, return it */
+ if (IopVerifyDeviceObjectOnStack(LocalDevice,
OpenPacket->TopDeviceObjectHint))
+ {
+ *DeviceObject = OpenPacket->TopDeviceObjectHint;
+ return STATUS_SUCCESS;
+ }
+
+ /* Failure case here */
+ /* If we thought was had come through a mount point,
+ * actually update we didn't and return the error
+ */
+ if (OpenPacket->TraversedMountPoint)
+ {
+ OpenPacket->TraversedMountPoint = FALSE;
+ return STATUS_MOUNT_POINT_NOT_RESOLVED;
+ }
+
+ /* Otherwise, just return the fact the hint is invalid */
+ return STATUS_INVALID_DEVICE_OBJECT_PARAMETER;
+}
+
NTSTATUS
NTAPI
IopParseDevice(IN PVOID ParseObject,
