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Full page heap settings on x64 Windows

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If we want to use gflags.exe to enable page heap settings (or any other image file execution options) for a 32-bit executable running on x64 Windows we should use 32-bit version of gflags.exe from 32-bit Debugging Tools for Windows (see windbg.org for quick download links) or if we want to set appropriate registry key manually we should use Wow6432Node branch:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\<process name with .exe extension>

Name: GlobalFlag
Type: REG_DWORD
Value: 0x02000000

Name: PageHeapFlags
Type: REG_DWORD
Value: 0x00000003

- Dmitry Vostokov @ DumpAnalysis.org -

           

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This entry was posted on Wednesday, July 8th, 2009 at 2:28 pm and is filed under Crash Dump Analysis, Debugging, Software Technical Support, Testing, Tools. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

3 Responses to “Full page heap settings on x64 Windows”

  1. Not a kernel guy Says:
    July 10th, 2009 at 5:18 am

    > HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\…

    This is actually a wrong way of doing that. You need to use either 32bit version of gflags.exe just like you have mentioned or 32bit version of regedit/reg without Wow6432Node in the path. Try it in Windows 7 x64 and you will see the difference. :-)

  2. Not a kernel guy Says:
    July 10th, 2009 at 5:20 am

    > Try it in Windows 7 x64 and you will see the difference. :-)

    (After thinking for 2 seconds) Actually, no, you will not. There is a symbolic link between those two on Windows 7. Anyway 32bit regedit/reg is the way to go.

  3. Dmitry Vostokov Says:
    July 10th, 2009 at 10:39 am

    Agree. I personally prefer gflags.exe and use regedit to double check :-)

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