Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results
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: https://www.osr.com/osr-learning-library/
On-access real time anti-virus minifilter
Hi all,
I'm trying to write an anti-virus which scans file's content when file operations are performed on them.
I've followed the avscan sample of Microsoft and added some stuff of my own.
The Microsoft sample scans the file when it is opened (IRP_MJ_CREATE) and when it is closed if the file was modified (IRP_MJ_CLEANUP).
After running the sample multiple times I witnessed the performance hit caused by this minifilter, since it scans almost every opened file.
Any ideas how to minimize the performance hit?
| 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! | ||
| Internals & Software Drivers | 30 Nov 2020 | LIVE ONLINE |
| Writing WDF Drivers | 7 Dec 2020 | LIVE ONLINE |
| Developing Minifilters | Early 2021 | LIVE ONLINE |