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:

Re: UWF and FltGetFileNameInformation/FltParseInformation

Dejan_MaksimovicDejan_Maksimovic Member - All Emails Posts: 334
This is a bigger issue than just FltParseFileNameInformation it seems ;)
None of the calls work in this particular case, either. Namely,
FltQueryFileNameInformation or even FltPerformSynchronousIo.

Heads up :(

Kind regards, Dejan.

On Tue, Aug 7, 2018 at 11:42 PM Dejan Maksimovic

> Hi, all.
> Has anyone had issues with FltParseInformation when UWF filter is
> running on W10E? (Unified Write Filter)
> This specifically happens only when the folder name is 5 characters
> (e.g. D:\12345)
> Steps to reproduce:
> - Set your minifilter's Altitude to 390000 or higher (so that it is
> above the UWF filter at least)
> - Turn on UWF feature via Programs and Features->Turn WIndows features
> on or off
> - It is under Device Lockdown->Unified Write Filter
> After reboot, make D:\12345 (or another volume, but not the C volume)
> Run the following commands in Admin command prompt/PowerShell:
> uwfmgr.exe volume protect d:
> uwfmgr.exe file add-exclusion d:\12345
> uwfmgr.exe filter enable
> Reboot
> If your minifilter uses FltGetFileNameInformation and then
> FltParseInformation, the ->Name and ->Volume will be identical (instead of
> Volume being just the volume part, it also contains \12345).
> Kind regards, Dejan.
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

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 30 Mar 2020 OSR Seminar Space
Developing Minifilters 15 Jun 2020 LIVE ONLINE
Writing WDF Drivers 22 June 2020 LIVE ONLINE
Internals & Software Drivers 28 Sept 2020 Dulles, VA