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View Thread: Memory Address Obfuscation in .NET Framework
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    Have you read about Execute Disable Bit in Intel Processors? Intel says:

    Execute Disable Bit: This feature, combined with a
    supported operating system, allows memory to be marked
    as executable or non-executable. If code attempts to run in
    non-executable memory the processor raises an error to the
    operating system.

    Also there is Data Execution Prevention (DEP) in Windows already which work well on Intel processors.

    I have tried it myself on a Pentium D processor with DEP turned ON. When any attempt to execute data in memory is made, the program crashes.

    Shreyas Zare