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Microsoft Drops Next-Generation Security Project [updated]

carsont Re:Microsoft does what it does best (385 comments)

IANACPUExpert, but my understanding is that x86 has had a distinction between code and data pages since at least the 80386.

Neither am I, but I believe that the old feature in the 386 only allows you to mark very large segments of memory non-executable.

SPARC, PA-RISC, Alpha, and presumably the new x86 chips with "NX" allow you to do this to individual pages.

I'm surprised *BSD (particularly) FreeBSD hasn't.

OpenBSD does. They call it W^X. It was enabled on the sparc, sparc64, hppa, and alpha ports in 3.3 and on the i386 and macppc ports in 3.4.

more than 10 years ago


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