Date: Tue, 1 Sep 2020 16:42:17 +0100 From: Mark Rutland <mark.rutland@....com> To: Mickaël Salaün <mic@...ikod.net> Cc: "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>, kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-fsdevel@...r.kernel.org, linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org, oleg@...hat.com, x86@...nel.org 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 ) goes back to 2000 with > PaX  (which predates partial OpenBSD implementation from 2003). > >  https://pax.grsecurity.net/docs/mprotect.txt >  https://undeadly.org/cgi?action=article;sid=20030417082752 Thanks for the pointers! Mark.
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