mjg c0fe514f04 Plug capability races.
fp and appropriate capability lookups were not atomic, which could result in
improper capabilities being checked.

This could result either in protection bypass or in a spurious ENOTCAPABLE.

Make fp + capability check atomic with the help of sequence counters.

Reviewed by:	kib
MFC after:	3 weeks
2014-10-04 08:08:56 +00:00
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