In a meeting earlier today, we discussed MSR access and that it could be
used to do bad things. The same applies to other forms of raw I/O
(/dev/mem, /dev/port, ioperm, iopl, etc.)
This is basically the same problem with which the secure boot people
have been struggling.
Peter Z. suggested we should taint the kernel on raw I/O access, and I
tend to concur.
So what I would like to suggest is that we create a new kernel helper
function which can return an error in secure boot mode and otherwise
taints the kernel with a raw I/O taint.
What do people think?
-hpa
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