Date: Mon, 28 Apr 1997 10:00:51 +0400 (MSD) From: Igor Vinokurov <igor@cs.ibank.ru> To: hackers@freebsd.org Subject: Re: console [on|off] (fwd) Message-ID: <199704280600.KAA12193@escape.cs.ibank.ru>
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re,
Anybody can explain this problem? I use screen from ordinary user
and can grab console even if no read permission to /dev/console
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Igor Vinokurov, JSB Inkombank
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by faui40.informatik.uni-erlangen.de (8.8.5/8.0.5-FAU) id WAA11198; Sun, 27 Apr 1997 22:01:11 +0200 (MET DST)
From: Michael Schroeder <Michael.Schroeder@informatik.uni-erlangen.de>
Message-Id: <199704272001.WAA11198@faui40.informatik.uni-erlangen.de>
Subject: Re: console [on|off]
To: igor@cs.ibank.ru (Igor Vinokurov)
Date: Sun, 27 Apr 1997 22:01:11 +0200 (MET DST)
Cc: Juergen.Weigert@informatik.uni-erlangen.de (Juergen Weigert)
In-Reply-To: <199704191536.TAA29579@escape.cs.ibank.ru> from "Igor Vinokurov" at Apr 19, 97 07:36:35 pm
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> re,
>
> jfyi, by "console on" command ordinary users may grab console
> even if no have read permission for /dev/console...
>
> Ugly, no?
No. The TIOCCONS ioctl is done with the uid of the user. Anybody
can compile a program that does the ioctl. If your OS allows the
ioctl even if the user does not own /dev/console or has read
permissions, it's the fault of the OS.
Michael.
---------------------------------------------------------------
Michael Schroeder mlschroe@immd4.informatik.uni-erlangen.de
main(_){while(_=~getchar())putchar(~_-1/(~(_|32)/13*2-11)*13);}
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