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Date: Fri, 23 Aug 2002 07:41:45 +0300
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Dima Dorfman <dima@trit.org>
Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/usr.bin/lock lock.1 lock.c
Message-ID: <20020823044145.GA784@hades.hell.gr>
References: <200207280713.g6S7DrEN047591@freefall.freebsd.org> <20020728071748.66FD33E1E@turbine.trit.org>
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On 2002-07-28 07:17 +0000, Dima Dorfman <dima@trit.org> wrote:
> Dima Dorfman <dd@FreeBSD.org> wrote:
> >   Log:
> >   Add a -v option that prevents switching virtual terminals while this
> >   terminal is locked.  This permits the user to easily lock the entire
> >   console from a single terminal.
>
> Despite my requests on -audit, this wasn't reviewed by anyone.  Since
> lock(1) is setuid root, I would appreciate it if someone could look it
> over (although none of the new code should run as root).

First of all, sorry for taking so long to reply to this.  I have
successfully locked my current twice, by playing tricks with screen(1)
and lock -v.  If I run lock -v -p in a virtual screen window I get:

	charon@hades[07:37]/home/charon$ lock -v -p
	lock: locking vty: Inappropriate ioctl for device

By running a slightly different version:

	charon@hades[07:37]/home/charon$ lock -v -p </dev/ttyv1

the virtual terminal locks, but since my current tty is a pty of
screen(1) I can't type anything.  Now, before anyone hits me with a
heavy, blunt thing...  I know this isn't supposed to work.  The
evilness happens when I hit CTRL-ALT-ESC though.  There's somewhere a
nasty interaction of DDB and the locked consoles.  The system freezes
and a constant beeping sound can be heard form the PC speaker :-(

-- 
FreeBSD: The Power to Serve <> http://www.FreeBSD.org
FreeBSD 5.0-CURRENT #0: Wed Aug 21 22:08:19 EEST 2002

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