[Gllug] Time Travel on Linux

[Richard Cohen]

You bastard, etc. etc. :-)

Sorry - I've not had any contact with Tigran in ages - think I bumped
into him once or twice on the streets of Watford ("Let me take you by
the hand and lead you through..."), but that was a while back.

Anyone who's interested could just email him, of course - his address
is in the MAINTAINERS file - and he's a friendly and approachable
chap...

Cheers
Richard

On 23/10/05, Jack Richards <jack.richards at gnu-solutions.com> wrote:
> IIRC This was written by Tigran. He used to be a lurker on this list. I suggest speaking to Richard Cohen ( sorry Richard send flames in my direction ) he might be able to point you in the right direction.
>
> Jack
>
> On Oct 23, 2005 05:13 PM, Daniel P. Berrange <dan at berrange.com> wrote:
>
> > On Sun, Oct 23, 2005 at 03:45:28PM +0100, Richard Jones wrote:
> > > Does anyone know if there's a modern version of this:
> > >
> > > http://www.ussg.iu.edu/hypermail/linux/kernel/9806.1/0940.html
> >
> > Creating a new kernel space version of it would be pretty much
> > impossible with a stock kernel, since sys_call_table is no longer
> > exported to modules (a good thing BTW, since its primary use was
> > letting rootkits override various system calls ;-)
> >
> > That said, if you can identify which system calls you wish to
> > override, it would be reasonably straightforware to create a
> > library you could LD_PRELOAD to wrap around the corresponding
> > GLibC functions.
> >
> > >
> > > <quote>
> > >   For those who do not know what I am talking about - Time Travel is a
> > >   kernel module (2.1.x only) that can be used to simulate the
> > >   environment with shifted (in any direction) concept of time, both in
> > >   the sense of system time and filesystem-related timestamps.
> > >
> > >   Amongst bad uses of Time Travel is bypassing license limitations of
> > >   commercial time-restricted demos. Such use is not encouraged! ;)
> > > </quote>
> >
> > Then, just set the LD_PRELOAD when running the license damaged software ;-)
> >
> > Dan.
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