Date: Fri, 20 Dec 1996 10:49:04 -0500 (EST) From: Robert Shady <rls@mail.id.net> To: ben@narcissus.ml.org (Snob Art Genre) Cc: igor@alecto.physics.uiuc.edu, sean@perky.gothic.net.au, freebsd-security@FreeBSD.org Subject: Re: stopping users from rebooting with ctr-alt-del Message-ID: <199612201549.KAA05651@server.id.net> In-Reply-To: <Pine.BSF.3.91.961220072039.8768A-100000@narcissus.ml.org> from Snob Art Genre at "Dec 20, 96 07:22:54 am"
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> > > I can already see a nice simple problem, in that it would only work after
> > > login...if you need to shutdown because you can't login for some reason
> > > (exhausted swap space because of a nasty process?), then this makes things
> > > difficult...but it should help machines in public places around people who
> > > have too much curiosity.
> > >
> >
> > Why would you need use ctrl-alt-del to reboot the machine ?
> > 1. it's not a shutdown (it doesn't resync, anyhow)
>
> I believe this is incorrect.
This is incorrect. Most PC UNIX's trap the Ctrl-Alt-Del keystrokes and
either run the standard "shutdown -r now", or call a sync, flush, and reboot.
> > 2. if you need to "reboot" it no matter what -
> > use the power switch, or "reset" button if one is present.
> > May be I am wrong, but I don't see bug difference [for Unix]
> > between ctrl-alt-del and "reset" .
>
> I think ctrl-alt-del syncs buffers and otherwise shuts down the machine
> "nicely". I may be wrong.
Yes, Ctrl-Alt-Del is a much safer way to reboot a PC based UNIX box than
just flipping the power off..
> > In a public place I would also disable "reset" and "power" button
> > <grin>
>
> Yes . . . in general I think allowing people physical access to a machine
> is a big risk. Anyone with a screwdriver and five minutes can remove your
> hard drive, after all.
Granted.
-- Rob
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