[Bug 236836] Kernel panic from calling mq_open("/.", ...) as root

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236836

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|12.0-RELEASE                |CURRENT
           Keywords|                            |panic
                 CC|                            |cem at freebsd.org

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
Yeah, I see the bug.  I think kern_kmq_open basically allows you to open any
arbitrary single-component name you want in the mqfs, including "." and "..",
which are special and reserved.  I didn't try to replicate the exact panic, but
the bug seems present in CURRENT as well.

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