[Bug 16911] New: WriteProcessMemory() not working for memory protected by X11DRV_DIB_DoProtectDIBSection()

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=16911

           Summary: WriteProcessMemory() not working for memory protected by
                    X11DRV_DIB_DoProtectDIBSection()
           Product: Wine
           Version: 1.1.12
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Keywords: patch, source
          Severity: minor
          Priority: P2
         Component: winex11.drv
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: thestig at google.com


Created an attachment (id=18660)
 --> (http://bugs.winehq.org/attachment.cgi?id=18660)
test program

Hi, I have a test case here that works on WinXP but not Wine. I deliberately
wrote a standalone test case because I'm not sure which unit test to put it in.
It's in fact based off of dlls/kernel32/tests/virtual.c where the other
WriteProcessMemory() test is.

In this test case, we call CreateDIBSection() which returns a HBITMAP (hbitmap)
and some memory (mem). Next, we call SetDIBits() with hbitmap. We get into
X11DRV_SetDIBits(), where it calls X11DRV_DIB_Lock( physBitmap,
DIB_Status_GdiMod );.

This marks the memory (mem) as PAGE_NOACCESS, and leaves it in that state as
SetDIBts() returns. Normally if the process tries to access it, we get a page
fault that's handled by X11DRV_DIB_FaultHandler(), and everything works.

However, when the test code calls WriteProcessMemory(), we talk to wineserver
in NtWriteVirtualMemory(). In wine_server_call(), we do send_request(), where
writev() tries to read 'mem' and fails with EFAULT. This doesn't trigger
X11DRV_DIB_FaultHandler(), and WriteProcessMemory() fails.


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