Fwd: Protected Memory

24 feb 2006 kl. 00.38 skrev Tomas Zahradnicky:

>>> I had a program under OS 9 that could be used to do this (mostly
>>> to cheat at games :)
>
> That programs usually didn't dare to just write and used
> undocumented APIs from PrivateInterfaceLib instead.
>
> Why would you need to do that?
>
>> Most modern operating systems do not allow one application to
>> access memory of another application (apart from shared memory
>> which requires the processes to cooperate).
>
> Well, most modern OSes allow you to do it through the VM APIs and
> you can map a portion of one process's virtual address space into
> your own process's address space where you can change it and
> possibly write it back if you have the enough privileges to do so,
> of course.

Someone already wrote a version of The Cheat to Mac OS X. You can
probably use it as reference. It's available with source at <http://
www.brokenzipper.com/> (GPL licenced).
--
Pelle Johansson