On Wed, Aug 19, 2020 at 08:53:42PM +0200, Mickaël Salaün wrote:

On 12/08/2020 12:06, Mark Rutland wrote:

quoted

Contemporary W^X means that a given virtual alias cannot be writeable
and executeable simultaneously, permitting (a) and (b). If you read the
references on the Wikipedia page for W^X you'll see the OpenBSD 3.3
release notes and related presentation make this clear, and further they
expect (b) to occur with JITS flipping W/X with mprotect().

W^X (with "permanent" mprotect restrictions [1]) goes back to 2000 with
PaX [2] (which predates partial OpenBSD implementation from 2003).

[1] https://pax.grsecurity.net/docs/mprotect.txt
[2] https://undeadly.org/cgi?action=article;sid=20030417082752

Thanks for the pointers!

Mark.

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