[Bug 211580] deny system message buffer access from jails

[bugzilla-noreply at freebsd.org]

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

Jamie Gritton <jamie at FreeBSD.org> changed:

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--- Comment #16 from Jamie Gritton <jamie at FreeBSD.org> ---
Created attachment 198114
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=198114&action=edit
Current revision of allow.read_msgbuf patch

I've updated Bjoern's patch for recent changes to allow.* handling, and gave it
a mention in jail(8).

As I mentioned, I'm still concerned about this permission bit beingoff by
default.  I think I might have misinterpreted Joe's focus (he may have been
referring to security.bsd.unprivileged_read_msgbufandnot allow.read_msgbuf),
but my comment remains: do we want to change the default behavior, or just
allow it to be changed for those who care?

A point in favor of changing the default is this is something of a security
issue, so a reasonable default is to tend toward the more secure - plus, that's
more  of a reason to include it in 12.  Hmm ... yeah, I can see either side. 
So which wins?

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