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Date:      Sun, 30 Apr 2000 10:16:41 +0200
From:      Markus Holmberg <markush@acc.umu.se>
To:        cjclark@home.com
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: /etc/fbtab login device matching
Message-ID:  <20000430101640.A896@mao.acc.umu.se>
In-Reply-To: <20000429164518.A30184@cc942873-a.ewndsr1.nj.home.com>; from cjc@cc942873-a.ewndsr1.nj.home.com on Sat, Apr 29, 2000 at 04:45:18PM -0400
References:  <20000429171114.A23133@mao.acc.umu.se> <20000429164518.A30184@cc942873-a.ewndsr1.nj.home.com>

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On Sat, Apr 29, 2000 at 04:45:18PM -0400, Crist J. Clark wrote:
> > I want to change the ownership of /dev/console to the user that logs in
> > (which sounds reasonable, right?)
> [snip]
> 
> Well, what happens when more than one user is logged in to the
> machine? For example, I frequently will log into a machine as a
> "mortal" user first on ttyv0. If at some point I need root privs, I go
> to the next ttyv and log in there as root rather than su. Who should
> own the console? You are setting yourself up for a reverse-race
> condition (the last person wins ;) over console ownership.

That's true :(. The main reason for using fbtab is to be able to grab
the console (with xconsole) when running as a normal user. su:ing and
running xconsole each time I start X is not an option :/.

Would "chmod o+r /dev/console" be an option? I'm not sure what security
implications this might have. Anyone could read the console log
messages.. But for what use?

Markus

-- 

Markus Holmberg         |       Give me Unix or give me a typewriter.
markush@acc.umu.se      |       http://www.freebsd.org/


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