mount_nullfs: /var/run/log: must be either a file or directory

Hi folks,

"recently", we added support for null-mounting single files:

https://freshbsd.org/freebsd/src/commit/521fbb722c33663cf00a83bca70ad7cb790687b3

This code restricts the mountable … thing to:

	if ((lowerrootvp->v_type != VDIR && lowerrootvp->v_type != VREG) || …


As the author of the abandoned https://reviews.freebsd.org/D27411
which attempted to add facility to syslog's rc to provide (selected)
jails with a log socket, it was pointed out to me that this is a big
security risk: https://reviews.freebsd.org/D27411#882100

so I was wondering if null mounts are the same kind of security
hazard, or if not allowing sockets is just the oversight of a
first approximation of this patch?

Kind regards,
Mina Galić

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