Re: sharing memory with user and kernel
- From: "Don Burn" <burn@xxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 28 May 2008 13:16:18 -0400
Using shared memory between user and kernel is a horrible approach period.
First it opens a ton of security holes, second it can be quite hard to
handle the problems of the user mode application going away or the driver
wanting to unload. Finally, you have the synchronization problems between
the user and kernel mode, if nothing else sync can eat up as much time as
just passing the data directly. This is really a very bad idea.
--
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
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"Maverick 1288" <Maverick 1288@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:639B2503-149A-4889-B4A1-5A52F1D96A2F@xxxxxxxxxxxxxxxx
Hello,
I developed an application in user mode that capture audio data and stores
the data in shared memory using CreateFileMapping and MapViewOfFile. This
memory is accessible via an API i've developed (standard DLL stuff). I'm
now
working on a virtual mic driver (MSVAD pcemx example drom DDK) and my
intentions is to ovverride the CopyTo function and pump the data from my
shared memory into the mic buffer. Is this a good approach ? and does any
body have an example on how to map the shared memory into the kernel space
?
- henrik
.
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