[Bug 29384] Voobly fails to launch Age of Empires II multiplayer game

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=29384

Michael Müller <michael at fds-team.de> changed:

           What    |Removed                     |Added
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                 CC|                            |michael at fds-team.de

--- Comment #37 from Michael Müller <michael at fds-team.de> ---
Created attachment 49657
  --> https://bugs.winehq.org/attachment.cgi?id=49657
ntdll: Change WRITECOPY memory protection to WRITE on first write access

Hi,

I wrote a patch which correctly changes the WRITECOPY memory protection to
WRITE when the first write occurs on a page. To achieve this every page with
WRITECOPY protection does not really gain write permission, so that a segfault
occurs on the first write access. The signal handler will now detect this case,
change the protection to WRITE and will continue the execution of the program.
This fixes Voobly and the according wine tests which were marked as todo.

The only downside of this patch is that Wine installs the signal handler quite
late as it expects a connection to the wine server. This is not sufficient for
our case since Wine also uses WRITECOPY for it's internal dlls leading to a
crash. In order to overcome this problem, I setup a temporarily signal handler
when Wine is done with setting up the virtual memory management. Currently the
patch only contains such a signal handler for i386 so that this patch will only
affect 32 bit software.

Regards,
Michael

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