WAX, short for W xor X, is a technique by which any page in a process' memory address space can be either writable or executable, but not both at the same time. This prevents exploits from writing code they want to execute into memory that then causes the program to execute that code. WAX has been available in OpenBSD since 3.4. Marc Espie provides a fuller description in an interview (http://www.onlamp.com/lpt/a/4676).
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