[Bug 230798] security/kernel possible to bypass kern.securelevel and immutable flags (chflags)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230798

            Bug ID: 230798
           Summary: security/kernel possible to bypass kern.securelevel
                    and immutable flags (chflags)
           Product: Base System
           Version: 10.4-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: sielaq at gmail.com

Scenario:

  Having applied "paranoia mode" 

  kern.securelevel: 1

  and even special chflags immutable flags
  and having nullfs loaded 

  nullfs_load="YES"

It is possible to bind the files with
mount_nullfs to cover the existing config or binaries.

Not sure if this is a bug or feature...
just in case raising it.

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