[Bug 283425] [nullfs] nosuid bypass

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283425

            Bug ID: 283425
           Summary: [nullfs] nosuid bypass
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: bugs-freebsd-org916@ketas.si.pri.ee

mounting nullfs from the source directory that resides on filesystem that has
nosuid option configured allows suid execution again

explicitly mounting nullfs with nosuid disables it

however, mount, in both cases shows that nosuid is set, when in reality it
isn't

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