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Date:      Fri, 8 Sep 2000 00:54:38 +0200 (CEST)
From:      Paul Herman <pherman@frenchfries.net>
To:        freebsd-hackers@FreeBSD.ORG
Subject:   the ol' init securelevel thread
Message-ID:  <Pine.BSF.4.21.0009080030210.276-100000@bagabeedaboo.security.at12.de>

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Hi,

[ Bcc'ed to -current ]

Perhaps it was a mistake :)  but I took up someone else's cause and
started a thread on -current which now probably belongs on -hackers.  
So:

What are the dangers of having init lower the securelevel to 0 when
the system goes into single user?  Looking at the mailing list
archive, this seems to be a re-occuring thread which always ended up
open-ended with no real answer.

Already established:

   * you _can't_ ptrace(2) init when securelevel > 0
   * rev1.9 of kern_mib.c unfortunately states nothing concrete
   * both NetBSD and OpenBSD allow this behaviour
   * Easy, I'm not married to this idea :-)  Just interested "academicaly"

So, what dangers are there?

-Paul.






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