jhb bed7b437a8 Set ISOPEN in namei flags when opening executable interpreters.
These vnodes are explicitly opened via VOP_OPEN via
exec_check_permissions identical to the main exectuable image.
Setting ISOPEN allows filesystems to perform suitable checks in
VOP_LOOKUP (e.g. close-to-open consistency in the NFS client).

Reviewed by:	kib
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D21129
2019-08-03 01:02:52 +00:00
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