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Do not allow the kernel to access usermode pages without installed

Description

Do not allow the kernel to access usermode pages without installed
fault handler. Panic immediately in such situation, on i386 and amd64.

Reviewed by: avg, jhb
MFC after: 1 week

Details

Provenance
kibAuthored on Oct 3 2011, 5:01 PM
Parents
rG24f3dcfe5094: Assert that exiting process does not return to usermode.
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