[Bug 257554] POSIX shared memory: Can't list allocations within jails

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257554

            Bug ID: 257554
           Summary: POSIX shared memory: Can't list allocations within
                    jails
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: grembo@FreeBSD.org

The sysctl kern.ipc.posix_shm_list isn't marked as jail-safe, which
results in problems listing POSIX shared memory allocations from
within a jail:

    # posixshmcontrol ls
    posixshmcontrol: cannot get kern.ipc.posix_shm_list length:
    Operation not permitted

while accessing them directly works, e.g.:

    # posixshmcontrol stat /xyz
    output as expected...

See also the jails mailing list:
https://lists.freebsd.org/archives/freebsd-jail/2021-June/000029.html

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