On Mon, 06 Dec 2004 09:00:52 -0500, John (J5) Palmieri wrote: > These are bug with the way Cedega works. No, it's an incompatibility between the Linux VM layout and the Windows VM layout. Up until the introduction of execshield there was no need to enforce this, on any platform. There are no "bugs" here. > Changing Fedora to work around a program's bugs would be wrong. No, actually it wouldn't be wrong. Some bugs will never be fixed (think unmaintained proprietary apps) and some bugs could be but a fix won't be available for a while. Fedora is supposed to be useful, right? So if an app which a lot of people need doesn't work, it's not being useful. > Cedrega should be fixed. You say that like it's a trivial 2 minute typo or something. It's not. The current approach taken in WineHQ (which TransGaming can't easily use due to the LGPL license not working with their business model) is the *third* attempt at a working solution. The first failed on systems with overcommit disabled, and didn't protect all VM areas anyway. The second blocked on a kernel bug. This is the PT_LOAD approach Jakub suggested elsewhere in the thread. Unfortunately this bug was only discovered *after* I had implemented it and found it didn't work. A fix was developed for said bug, but it didn't work on some obscure CPU arch the patch developer didn't have access to, and was dropped. The third is what we use now, and it took many months to stabilise and work out all the problems with vDSO kernels, aggressive compiler optimizations, systems that ship TLS enabled static libcs, and a host of other bugs I've probably forgotten about. Here is the code: http://source.winehq.org/source/loader/preloader.c Pretty isn't it? If you can understand all of it on first reading, well done, have a cookie. The Cedega team is much smaller than the WineHQ community is (about 4-5 people). I did talk to one of the TG guys about this and he strongly implied that they would not be fixing this problem: switching off execshield/prelink would continue to be the recommended way of making Cedega work. So this is one of these "bugs" that will probably never be fixed. Ever. In short by the time a good solution was found for Wine+execshield/prelink, over a year had passed. Most of the work was done by CodeWeavers although much of the preliminary R&D was done by me as a volunteer before I joined the company. Unfortunately like a lot of Red Hatters you seem to see the world in black and white. Especially you are very fast to blame others "buggy code" when problems arise. This attitude is quite tiring: do you realise that every single Red Hat/Fedora release from RH9 onwards has broken Wine in some way? Every single one? Usually these were not simple things to fix. They required extremely complex re-working of core code which few understand. I'm not saying execshield or prelink or NPTL or the 4G VM patch or anything else that broke it are bad technologies, they aren't and I am very happy that we were able to find a solution that allows Wine to work when they're active. But please, have a more considerate attitude for those of us that have sunk months into dealing with these sparkly new features instead of writing things off as "bugs" which "should be fixed". thanks -mike
