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/
I am working on a an FS minifilter registered for IRP_MJ_WRITE with SKIP_CACHED_IO. I am returning status_access_denied in preoperation callback. This works fine but for very small files, like < 100 bytes, the block operation doesnt prevent the update to the disk. After rebooting the server the contents of the file are seen. I saw some earlier threads and it appears that for very small files the content is stored in the MFT itself. When I use ProcessMonitor, I see a write success for the application and access denied for all subsequent paging IOs. Is there any other way to block the small write ?
|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!|
|Writing WDF Drivers||7 Dec 2020||LIVE ONLINE|
|Internals & Software Drivers||25 Jan 2021||LIVE ONLINE|
|Developing Minifilters||8 March 2021||LIVE ONLINE|