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Exclusive page-frame ownership

Exclusive page-frame ownership

Posted Sep 15, 2016 3:27 UTC (Thu) by luto (subscriber, #39314)
Parent article: Exclusive page-frame ownership

The direct map should be NX on any recent x86 kernel, and it should be the equivalent of NX on all sensible architectures. Are there counterexamples?

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Exclusive page-frame ownership

Posted Sep 16, 2016 8:31 UTC (Fri) by pbonzini (subscriber, #60935) [Link]

Yes, that's what the article says at the end. But you can still place the stack pointer in the direct map in order to bypass SMAP, and then do ROP.


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