MMF : with File system filter

NTFSD
1

Hi
I’m trying to develop a File System Filter for Encrypting some important files on the fly.
I could do it with program that access the files with NTReadFile & NTWriteFile, BUT The problem was with memory maped files.

I saw 2 samples of File System Filters on the IFS_XP. BUT they worked only with NTRead & NTWrite, NOT with Memory maped files (As I understant).
So could any one have any idea or any smaple code that demonstarte how to filter the data accessed VIA MMF.
Thanks very very much for any help
Fad

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2

Intercept the paging IO IRPs and encrypt/decrypt there.

Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com

----- Original Message -----
From:
To: “Windows File Systems Devs Interest List”
Sent: Tuesday, February 24, 2004 1:44 PM
Subject: [ntfsd] MMF : with File system filter

> Hi
> I’m trying to develop a File System Filter for Encrypting some important
files on the fly.
> I could do it with program that access the files with NTReadFile &
NTWriteFile, BUT The problem was with memory maped files.
>
> I saw 2 samples of File System Filters on the IFS_XP. BUT they worked only
with NTRead & NTWrite, NOT with Memory maped files (As I understant).
> So could any one have any idea or any smaple code that demonstarte how to
filter the data accessed VIA MMF.
> Thanks very very much for any help
> Fad
>
> -------------------------------------------------------------
> NetCourrier, votre bureau virtuel sur Internet : Mail, Agenda, Clubs,
Toolbar…
> Web/Wap : www.netcourrier.com
> T?l?phone/Fax : 08 92 69 00 21 (0,34 ? TTC/min)
> Minitel: 3615 NETCOURRIER (0,16 ? TTC/min)
>
>
>
> —
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