Re: communication between Ring0 and Ring3
From: Steve Maillet \(eMVP\) (nospam1_at_EntelechyConsulting.com)
Date: 02/25/04
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Date: Wed, 25 Feb 2004 08:42:52 -0500
That's not actually true. Kernel Mode simply allows full access to the
statically mapped virtual addresses without incurring an access violation.
There is still protection from access across process spaces, etc. and the
CPUs protection mechanisms are still used including privileged instruction
protections.
It's also not true that on all embedded systems that there is no way to add
code to a device. (Pocket PCs use Windows CE in FULL Kernel mode now so that
can be a concern for those devices) There is a measurable performance
increase as the system can take some shortcuts in the system call process
bypassing a few security and memory access permission checks.
-- Steve Maillet (eMVP) Entelechy Consulting smaillet_AT_EntelechyConsulting_DOT_com
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