Virtual Pages difference - Spotted with VirtualQuery()
Massimo
max at veneto.com
Thu Jul 18 12:10:08 CDT 2002
Posted in bugzilla, I'll add the executable later on, and the patch... But it's not a
solution, it's only make app believing the page has a different protection flag,
doesn't correct the protection itself.... Should cause errors elsewhere.
Date sent: Wed, 17 Jul 2002 19:45:36 -0600
From: Tony Lambregts <tony_lambregts at telusplanet.net>
To: max at veneto.com
Copies to: wine-devel at winehq.com
Subject: Re: Virtual Pages difference - Spotted with VirtualQuery()
> 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
>
>
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