Virtual Pages difference - Spotted with VirtualQuery()

[Tony Lambregts]

Max wrote:

>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 :-)
>
>Regards
>
>Max
>  
>
This is an excellent bug report but even if someone starts working on it 
right away it would be nice to have this stuff in bugzilla. That 
includes the exe and your (maybe not-so) ugly hack.


Tony Lambregts