[Bug 211580] deny system message buffer access from jails

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211580

Jamie Gritton <jamie at FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open

--- Comment #15 from Jamie Gritton <jamie at FreeBSD.org> ---
(In reply to Joe Barbish from comment #13)

> "security.bsd.unprivileged_read_msgbuf" MIB should be implemented in the same manner as that used for "allow.raw_sockets". The default being not allowed.

I'm worried about making allow.read_msgbuf default to not allowed, for the
reason that current behavior wouldn't be preserved.  A jail without a
particular option should generally behave the same as an older jail when the
option didn't exist.  There may be exceptions to this, but I don't see it here.

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