Message-ID: <3C684EF2.2040609@freesurf.fr>
Date: Tue, 12 Feb 2002 00:08:34 +0100
From: Kilobug <kilobug@freesurf.fr>
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To: SA products <super.aorta@ntlworld.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: faking time
In-Reply-To: <3C67AFD3.722C5471@ntlworld.com>
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Sender: linux-kernel-owner@vger.kernel.org

SA products wrote:
> Dear Kernel list,
> 
> I want to fake the time returned by the time() system call so that for a
> limited number
> of user space programs the time can be set to the future or the past
> without affecting
> other applications and without affecting system time-- Ideally I would
> like to install a
> loadable module to accomplish this- Any hints ? Any starting points?

Maybe could you use a shared library loaded with LD_PRELOAD that
overrides the libc's time() function ?
IMHO this is simpler (and safer) than writing a kernel module, but
it will only work with dynamically linked programs, not with static
nor suid-ed programs.

-- 
** Gael Le Mignot "Kilobug", Ing3 EPITA - http://kilobug.free.fr **
Home Mail   : kilobug@freesurf.fr          Work Mail : le-mig_g@epita.fr
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"Software is like sex it's better when it's free.", Linus Torvalds

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