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Date: Tue, 14 Jan 2003 15:11:41 -0800
From: Bob Miller <rem@osdl.org>
To: DervishD <raul@pleyades.net>
Cc: Philippe Troin <phil@fifi.org>, root@chaos.analogic.com,
       Linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Changing argv[0] under Linux.
Message-ID: <20030114231141.GC4603@doc.pdx.osdl.net>
References: <Pine.LNX.3.95.1030114140811.13496A-100000@chaos.analogic.com> <87iswrzdf1.fsf@ceramic.fifi.org> <20030114220401.GB241@DervishD> <20030114230418.GB4603@doc.pdx.osdl.net>
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On Tue, Jan 14, 2003 at 03:04:18PM -0800, Bob Miller wrote:
> On Tue, Jan 14, 2003 at 11:04:01PM +0100, DervishD wrote:
> >     Hi Philippe :)
> > 
> > > You just overwrote all your arguments (argv[0] and others) and part of
> > > the environment.
> > 
> >     Oh, sh*t, you're true, and that is the problem I was afraid to
> > suffer from. Then, all I can do is overwrite argv[0] with a new
> > string whose length is less or equal than the existing one.
> > 
> >     Well, I suppose I must go with that limitation.
> > 
> >     Thanks, Philippe, for the code snipped and the explanation.
> > 
> >     Ra?l
> > -
> 
> Or you can copy your all your args and env to a temporary place and
> then re-build your args and env with the new argv[0] in it's place.
> But you must be carefull that your new argv[0] length plus the 
> length of all remaining args, envp and pointers is not greater than
> the system defined size for this space.
> 
In thinking about this more this will NOT work.  The user stack starts
right after your envp.  So, writing more info there would blow away
your stack.

-- 
Bob Miller					Email: rem@osdl.org
Open Source Development Lab			Phone: 503.626.2455 Ext. 17
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