[Bug 287977] ZFS NFS exports allows mounts by clients not in the list of /etc/exports (though the files are inaccessible anyway)

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 03 Jul 2025 13:20:41 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287977

Rick Macklem <rmacklem@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |rmacklem@FreeBSD.org

--- Comment #1 from Rick Macklem <rmacklem@FreeBSD.org> ---
Like it or lump it, it's a feature.
Why?
Because for NFSv4, there is no concept of
a "mount". What the client does has nothing
to do with the file systems (at least typically).
Although you used names I don't recognize, I
suspect they are Linux variants.

The only time the "mount" might fail is if it
is restricted by the "V4:" export line.

As you note, the clients do not have access to
the files, which is what the exports(5) lines
other than the "V4:" one specifies.

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