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

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

IRP validation from usermode

alex_vogtalex_vogt Member - All Emails Posts: 2

I was wondering if its possible to do some sort of validation from usermode requests,
lets say i have a dll injected into explorer.exe, this dll sends ioctl's to the device.
Is there some kind of method to block requests that doesnt come from explorer.exe ?

Thanks in advance


  • Tim_RobertsTim_Roberts Member - All Emails Posts: 13,195

    No. You can make the driver "exclusive", which means only one application can open it at a time. Since Explorer starts early and usually stays loaded until the system goes down, that should be pretty secure.

    There is a cost/benefit analysis to be done, and I'm quite serious about this. You can spend a fortune adding extra padlocks and deadlocks in your scheme, but whatever "locks" you put in can be picked by a sufficiently motivated hacker. They are smarter than you are, and they have more time. It all comes down to knowing the value of what you're protecting, and it is extremely easy to overvalue your driver. If you're just protecting some IP, then I think it's ridiculous to do anything more than the exclusive mode. That will keep honest people honest.

    Tim Roberts, [email protected]
    Providenza & Boekelheide, Inc.

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
Writing WDF Drivers 21 Oct 2019 OSR Seminar Space & ONLINE
Internals & Software Drivers 18 Nov 2019 Dulles, VA
Kernel Debugging 30 Mar 2020 OSR Seminar Space
Developing Minifilters 27 Apr 2020 OSR Seminar Space & ONLINE