Microsoft KB Archive/137235

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PRB: Module Relocation Fixups in Shared Sections Cause Problem

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Q137235

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The information in this article applies to:


 * Microsoft Win32 Software Development Kit (SDK)

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SYMPTOMS
If a shared section in a 32-bit PE module contains relocation fixups, those fixups are applied to all instances of that shared section. This implies that all instances of a module with such a section must be loaded at the module's preferred image base; otherwise, the resulting relocated values will be invalid. This is true in both Windows 95 and Windows NT.

CAUSE
Because an explicitly shared section shares the same physical pages with all instances of that module, fixups that are applied in a second or subsequent instance of the module overwrite the values from the first instance. The resulting values will be invalid for either one or all instances.

RESOLUTION
Do not place relocatable values in a shared section. A module can be forced to be non-relocatable by removing fixup records, although this may result in load failures for that module if it can't be loaded at its preferred address.

STATUS
This behavior is by design.

MORE INFORMATION
An example of something that causes a relocation fixup is a pointer in a shared section. Storing hInstance variables in a shared section is another.

Additional query words: 4.00 Windows 95 win95fest

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Technology : kbWin32SDKSearch kbAudDeveloper kbSDKSearch kbWin32sSearch