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/HIGHENTROPYVA (Support 64-Bit ASLR)

Specifies that the executable image supports high-entropy 64-bit address space layout randomization (ASLR).

/HIGHENTROPYVA[:NO]

By default, /HIGHENTROPYVA is on for 64-bit executable images. It is not applicable to 32-bit executable images. To enable this option, /DYNAMICBASE must also be on.

/HIGHENTROPYVA modifies the header of a .dll file or .exe file to indicate whether ASLR with 64-bit addresses is supported. When this option is set on an executable and all of the modules that it depends on, an operating system that supports 64-bit ASLR can rebase the segments of the executable image at load time by using randomized addresses in a 64-bit virtual address space. This large address space makes it more difficult for an attacker to guess the location of a particular memory region.

To set this linker option in Visual Studio

  1. Open the project Property Pages dialog box. For more information, see How to: Open Project Property Pages.

  2. Expand the Configuration Properties node.

  3. Expand the Linker node.

  4. Select the Command Line property page.

  5. In Additional Options, enter /HIGHENTROPYVA or /HIGHENTROPYVA:NO.

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