Konstantin Belousov 509124b626 Add AT_EMPTY_PATH for several *at(2) syscalls
It is currently allowed to fchownat(2), fchmodat(2), fchflagsat(2),
utimensat(2), fstatat(2), and linkat(2).

For linkat(2), PRIV_VFS_FHOPEN privilege is required to exercise the flag.
It allows to link any open file.

Requested by:	trasz
Tested by:	pho, trasz
Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D29111
2021-04-15 12:48:11 +03:00
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