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August 31st, 2004, 01:22 PM
#1
Getting in ring 0 on winXp
I am writing a program in 16 bit x86 assembly which has to work on NT based systems.
Now unlike in win9x, I read one cannot do certain low-level operations in user mode like using int 13h which is exactly what I have to use.
Various sources say to write a virtual device driver (VxD) which then runs in ring 0, but that goes beyond my capabilities (I think). I have not really found what I'm looking for.
Can somebody explain how I get in ring 0 (kernel privileges). A code example of the most simple program with such privileges would be very helpful.
Anyway, I only need to be able to use int 13h.
Thank you
EDIT: apparantly, VxD is obsolete and has been replaced by WDM:
Wikipedia says:
In computing WDM stands for Windows Driver Model. It provides a framework for device drivers that operate under Microsoft Windows 98/ME/2000/XP and Server 2003. WDM is a successor of VxD, which was used on older versions of Windows. WDM drivers are layered in a complex hierarchy and communicate with each other via IO Request Packets IRPs.
Do I really need to write a WDM to use int 13 ?
The above sentences are produced by the propaganda and indoctrination of people manipulating my mind since 1987, hence, I cannot be held responsible for this post\'s content - me
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