[Gllug] Time Travel on Linux

[Jack Richards]

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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