folder hiding by minifilter: Hang-up because of vaccine ?

NTFSD
1

I wrote a minifilter driver for hiding a specific folder.
For implemention, I added PreOperation and PostOperation callback for IRP_MJ_DIRECTORY_CONTROL.
In PreOperation callback it does nothing, but returns with FLT_PREOP_SUCCESS_WITH_CALLBACK.
In PostOperation it processes something only in the case with IRP_MN_QUERY_DIRECTORY MinorFunction.
I tested it on Windows XP SP3, it works well when vaccine is not installed.
But system became hung up when vaccine(KasperSky 2009) is installed.
Why does it hang up ?
Let me know why it does.

2

> Let me know why it does.

Ask Mr.Kaspersky about it…

Anton Bassov