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Date:      07 Sep 1999 10:26:18 +0200
From:      Dag-Erling Smorgrav <des@flood.ping.uio.no>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        "Matthew D. Fuller" <fullermd@futuresouth.com>, Dag-Erling Smorgrav <des@flood.ping.uio.no>, KATO Takenori <kato@ganko.eps.nagoya-u.ac.jp>, bde@zeta.org.au, freebsd-hackers@FreeBSD.ORG, freebsd-security@FreeBSD.ORG
Subject:   Re: Init(8) cannot decrease securelevel
Message-ID:  <xzpu2p7ktzp.fsf@flood.ping.uio.no>
In-Reply-To: Matthew Dillon's message of "Mon, 6 Sep 1999 13:29:44 -0700 (PDT)"
References:  <199909060513.PAA12402@godzilla.zeta.org.au> <19990906142342F.kato@gneiss.eps.nagoya-u.ac.jp> <xzp1zcco10z.fsf@flood.ping.uio.no> <199909061539.IAA74893@apollo.backplane.com> <19990906141231.L18814@futuresouth.com> <199909062029.NAA76229@apollo.backplane.com>

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Matthew Dillon <dillon@apollo.backplane.com> writes:
>     So making DDB 'secure-level friendly' would be a useful thing
>     tgo do, I think.  The idea is not to disable DDB, but to simply 
>     limit the actions that can be performed within it if the securelevel
>     has been raised.  The sysadmin would only be allowed to issue
>     passive commands, cont, and 'panic'.  The sysadmin would not be
>     allowed to modify the running system.

That's an excellent idea - it shouldn't be too hard to add a kernel
option (say, DDB_RESTRICTED) and #ifndef the "dangerous" commands.

DES (must... write... patches...)
-- 
Dag-Erling Smorgrav - des@flood.ping.uio.no


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