[Bug 232021] zfs cannot mount 'dataset': Insufficient privileges

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232021

--- Comment #13 from Allan Jude <allanjude at FreeBSD.org> ---
(In reply to Oleg from comment #9)
The difference is that unmounting has only one input, the filesystem you wish
to unmount.

Mounting is more dangerous. Sure bob is allowed to mount zroot1/tst, but the
system call also allows them to mount zroot1/tst to /etc

Now a filesystem the user controls, contains the password file, and that user
is now root.

That is why the FreeBSD vfs.usermount feature implements a sanity check, bob
can only mount filesystems to directories they is the owner of.

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