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enhance sysctl kern.expose_address

This patch:

Changes kern.expose_address to a tri-state variable:

0: no access
1: access only to processes that have opened /dev/kmem
2: access to every process

It also optimizes the access control to happen only once per sysctl (not
once per process), and disallows it for procfs access.

I am planning to commit this soon, so please let me know if you see any


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