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Date: Tue, 1 Sep 2020 16:42:17 +0100
From: Mark Rutland <>
To: Mickaël Salaün <>
Cc: "Madhavan T. Venkataraman" <>,,,,,,,,,
Subject: Re: [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor

On Wed, Aug 19, 2020 at 08:53:42PM +0200, Mickaël Salaün wrote:
> On 12/08/2020 12:06, Mark Rutland wrote:
> > 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]
> [2];sid=20030417082752

Thanks for the pointers!


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