Message-Id: <200701221520.l0MFKLdK032645@turing-police.cc.vt.edu>
To: Samium Gromoff <_deepfire@feelingofgreen.ru>
Cc: David Wagner <daw@cs.berkeley.edu>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Undo some of the pseudo-security madness
In-Reply-To: Your message of "Mon, 22 Jan 2007 02:23:30 +0300."
             <87r6toufpp.wl@betelheise.deep.net>
From: Valdis.Kletnieks@vt.edu
References: <87r6toufpp.wl@betelheise.deep.net>
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On Mon, 22 Jan 2007 02:23:30 +0300, Samium Gromoff said:
>
> not "core-dumps" but "core files", in the lispspeak, but anyway.
> 
> the reason is trivial -- if i can write programs enjoying setuid
> privileges in C, i want to be able to do the same in Lisp.

Go read up on how the XEmacs crew designed their "portable dumper",
specifically to get around a lot of these sorts of problems because the
old Emacs 'unexec' code was incredibly fragile.

> the only way to achieve this i see, is to directly setuid root
> the lisp system executable itself -- because the lisp code
> is read, compiled and executed in the process of the lisp
> system executable.

If that's the only way you can see to do it, maybe you should think a
bit harder before making kernel hacks to do something.


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