Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results


Before Posting...

Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

Querying a mapped drive volume object

slipknothoudinislipknothoudini Member Posts: 2

I am trying to use ZwQueryVolumeInformation to gather information on a volume. To get the handle required to pass into ZwQueryVolumeInformation, I am calling ZwOpenFile with FILE_NON_DIRECTORY_FILE. Here is my code exerpt:

PHANDLE handle = NULL;
OBJECT_ATTRIBUTES objectAttributes;
NTSTATUS status;

InitializeObjectAttribute(&objectAttributes, &gVolumePath, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
status = ZwOpenFile(handle, FILE_GENERIC_READ, &objectAttributes, &iosb, FILE_SHARE_READ, FILE_NON_DIRECTORY_FILE);
gVolumePath is a UNICODE_STRING "Mup" (the object name of the mapped drive I am trying to query
The status comes back as -1073741767 (Object Path Component was not a directory object). I am not entirely sure why I am getting this error since I am using FILE_NON_DIRECTORY_FILE.


  • 0xrepnz0xrepnz Member Posts: 102

    Is gVolumePath = "\Device\Mup" or "Mup"? It should be "\Device\Mup".
    Also, the sample code you sent has a bug: You need to define the handle as HANDLE (not PHANDLE) and then pass &handle to ZwOpenFile.

    - Ori Damari
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. Sign in or register to get started.

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Kernel Debugging 13-17 May 2024 Live, Online
Developing Minifilters 1-5 Apr 2024 Live, Online
Internals & Software Drivers 11-15 Mar 2024 Live, Online
Writing WDF Drivers 20-24 May 2024 Live, Online