[Bug 220712] Extended attributes within a jail cant be set

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220712

            Bug ID: 220712
           Summary: Extended attributes within a jail cant be set
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dewayne at heuristicsystems.com.au

Within a jailed environment the system namespace is unavailable
# touch /a
# setextattr system md5 `md5 -q /a` /a
setextattr: /a: failed: Operation not permitted
# setextattr user md5 `md5 -q /a` /a
# getextattr user md5 /a
/a  d41d8cd98f00b204e9800998ecf8427e

Within the base system, both namespaces are available
# touch /a
# setextattr system md5 `md5 -q /a` /a
# getextattr system md5 /a
/a      d41d8cd98f00b204e9800998ecf8427e
(and user namespace is ok)

Inability to access "system" namespace has significant ramifications for
applications/ports like Samba.  Which is unable to provision within a jailed
or, I strongly suspect any virtual environment.

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