[Bug 890] Virtual Pages difference - Spotted with VirtualQuery()

[Wine Bugs]

http://bugs.winehq.com/show_bug.cgi?id=890

------- Additional Comments From [e-mail]  2003-20-06 08:08 -------
Bug comments from Gmane.org:

As usual, AutoCAD seems to be a good test-bench for wine :-) 
I spotted the problem that seemed coming from VirtualQuety function, but 
that is (I guess... hmmmm) more a problem of memory handling in wine.

I made a little test app; here the results in wine and win2k, later on 
the app itself :

WINE RESULTS :

Memory info about '004012F0' : 
    Base Address        : 00401000 
    Allocation Base     : 00400000 
    Allocation Protect  : PAGE_READONLY | PAGE_WRITECOPY |               
                          PAGE_EXECUTE_READWRITE | PAGE_NOACCESS 
    Region Size         : 00017000 
    State               : MEM_COMMIT 
    Protect             : PAGE_WRITECOPY      <----- HERE 
    Type                : MEM_PRIVATE

WIN2k RESULTS :

Memory info about '004012F0' : 
    Base Address        : 00401000 
    Allocation Base     : 00400000 
    Allocation Protect  : PAGE_EXECUTE_WRITECOPY 
    Region Size         : 00001000 
    State               : MEM_COMMIT 
    Protect             : PAGE_EXECUTE_READ    <---- AND HERE 
    Type                : MEM_IMAGE

Well, dunno too much about Type field, I didn't find an app that check it yet; 
I did find the app that uses Protect flag; I think it's poor coded, but as  
usual we should make bad apps work too :-) 
The app put some data in code page, not yet spotted if hard or soft-coded, 
then before reading it checks Protect field to see if it has not set the  
PAGE_GUARD, NO_ACCESS and WRITECOPY flags; if t has, it hangs some 10.000  
lines later (sigh....) 
I think wine should set Protect flag quite as like as possible as windoze

For AutoCAD2000 I put a dirty hack in process.c, but is really ugly; i'd  
prefer not to put my hands (bytes ?) too deeply inside some code that I don't  
understand completely...

Attached is the test source (compiled in Borland CBuilder, but should work  
with any compiler, apart some unuseful pragma's). 
If needed I can post the compiled too :-)

------- Additional Comments From maxx2 <at> veneto.com  2002-07-18 03:09 ------- 
Created an attachment (id=232)
 --> (http://bugs.winehq.com/attachment.cgi?id=232&action=view) 
C++ Test app for bug 890

------- Additional Comments From maxx2 <at> veneto.com  2002-07-19 14:42 ------- 
 Just submitted a Patch on wine-patches that seems to solve the problem.