Slashdot Mirror

jones_supa writes "Valve has recently released Portal 2 on Steam for Linux and opened a GitHub entry to gather all the bugs from the community. When one of the Valve developers closed a bug related to Portal 2 recommending that the users disable a security feature, the Linux community reacted. A crash is caused by the game's interaction with SELinux, the Linux kernel subsystem that deals with access control security policies. Portal 2 uses the third-party Miles Sound System MP3 decoder which, in turn, uses execheap, a feature that is normally disabled by SELinux. Like its name suggests, execheap allows a program to map a part of the memory so that it is both writable and executable. This could be a problem if someone chose to use that particular memory section for buffer overflow attacks; that would eventually permit the hacker to gain access to the system by running code. In the end, Valve developer David W. took responsibility of the problem: 'I apologize for the mis-communication: Some underlying infrastructure our games rely on is incompatible with SELinux. We are hoping to correct this. Of course closing this bug isn't appropriate and I am re-opening it.' This is more of an upstream problem for Valve. It's not something that they can fix directly, and most likely they will have to talk with the Miles developers and try to repair the problem from that direction."

An anonymous reader writes "After some lobbying from Internet fans, Activision has released the source code for its Civilization-related PC strategy sequel "Call to Power 2". Fan-site Apolyton have announced this today, and the 8mb source code can be downloaded here . The readme notes that they could not distribute the Miles Sound library with the code, and that you need to have bought a copy of the game to use its data directory - there's plenty of discussion over at the CtP2 open source forums."

Thanks to an anonymous reader for pointing out that the official Unreal Technology page has been updated with a software renderer for Unreal Tournament 2K3. This is an interesting step for those gamers with fast CPUs but inadequate 3D cards. The Pixomatic technology powering it was co-developed by Michael Abrash, John Carmack's right-hand man during the development of Quake, and a famous programmer and writer (at Microsoft and elsewhere) way before then.