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From: Mark Rutland <mark.rutland@arm.com>
To: "Mickaël Salaün" <mic@digikod.net>
Cc: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>,
	kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org, oleg@redhat.com,
	x86@kernel.org
Subject: Re: [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor
Date: Tue, 1 Sep 2020 16:42:17 +0100
Message-ID: <20200901154217.GD95447@C02TD0UTHF1T.local> (raw)
In-Reply-To: <41c4de64-68d0-6fcb-e5c3-63ebd459262e@digikod.net>

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

Thanks for the pointers!

Mark.

      reply index

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <aefc85852ea518982e74b233e11e16d2e707bc32>
2020-07-28 13:10 ` madvenka
2020-07-28 13:10   ` [PATCH v1 1/4] [RFC] fs/trampfd: Implement the trampoline file descriptor API madvenka
2020-07-28 14:50     ` Oleg Nesterov
2020-07-28 14:58       ` Madhavan T. Venkataraman
2020-07-28 16:06         ` Oleg Nesterov
2020-07-28 13:10   ` [PATCH v1 2/4] [RFC] x86/trampfd: Provide support for the trampoline file descriptor madvenka
2020-07-30  9:06     ` Greg KH
2020-07-30 14:25       ` Madhavan T. Venkataraman
2020-07-28 13:10   ` [PATCH v1 3/4] [RFC] arm64/trampfd: " madvenka
2020-07-28 13:10   ` [PATCH v1 4/4] [RFC] arm/trampfd: " madvenka
2020-07-28 15:13   ` [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor David Laight
2020-07-28 16:32     ` Madhavan T. Venkataraman
2020-07-28 17:16       ` Andy Lutomirski
2020-07-28 18:52         ` Madhavan T. Venkataraman
2020-07-29  8:36           ` David Laight
2020-07-29 17:55             ` Madhavan T. Venkataraman
     [not found]         ` <81d744c0-923e-35ad-6063-8b186f6a153c@linux.microsoft.com>
2020-07-29  5:16           ` Andy Lutomirski
2020-07-28 16:05   ` Casey Schaufler
2020-07-28 16:49     ` Madhavan T. Venkataraman
2020-07-28 17:05     ` James Morris
2020-07-28 17:08       ` Madhavan T. Venkataraman
2020-07-28 17:31   ` Andy Lutomirski
2020-07-28 19:01     ` Madhavan T. Venkataraman
2020-07-29 13:29     ` Florian Weimer
2020-07-30 13:09     ` David Laight
2020-08-02 11:56       ` Pavel Machek
2020-08-03  8:08         ` David Laight
2020-08-03 15:57           ` Madhavan T. Venkataraman
2020-07-30 14:42     ` Madhavan T. Venkataraman
     [not found]     ` <6540b4b7-3f70-adbf-c922-43886599713a@linux.microsoft.com>
2020-07-30 20:54       ` Andy Lutomirski
2020-07-31 17:13         ` Madhavan T. Venkataraman
2020-07-31 18:31           ` Mark Rutland
2020-08-03  8:27             ` David Laight
2020-08-03 16:03               ` Madhavan T. Venkataraman
2020-08-03 16:57                 ` David Laight
2020-08-03 17:00                   ` Madhavan T. Venkataraman
2020-08-03 17:58             ` Madhavan T. Venkataraman
2020-08-04 13:55               ` Mark Rutland
2020-08-04 14:33                 ` David Laight
2020-08-04 14:44                   ` David Laight
2020-08-04 14:48                   ` Madhavan T. Venkataraman
2020-08-04 15:46                 ` Madhavan T. Venkataraman
2020-08-02 13:57           ` Florian Weimer
2020-08-02 18:54     ` Madhavan T. Venkataraman
2020-08-02 20:00       ` Andy Lutomirski
2020-08-02 22:58         ` Madhavan T. Venkataraman
2020-08-03 18:36         ` Madhavan T. Venkataraman
2020-08-10 17:34         ` Madhavan T. Venkataraman
2020-08-11 21:12           ` Madhavan T. Venkataraman
2020-08-03  8:23       ` David Laight
2020-08-03 15:59         ` Madhavan T. Venkataraman
2020-07-31 18:09   ` Mark Rutland
2020-07-31 20:08     ` Madhavan T. Venkataraman
2020-08-03 16:57     ` Madhavan T. Venkataraman
2020-08-04 14:30       ` Mark Rutland
2020-08-06 17:26         ` Madhavan T. Venkataraman
2020-08-08 22:17           ` Pavel Machek
2020-08-11 12:41             ` Madhavan T. Venkataraman
2020-08-11 13:08               ` Pavel Machek
2020-08-11 15:54                 ` Madhavan T. Venkataraman
2020-08-12 10:06           ` Mark Rutland
2020-08-12 18:47             ` Madhavan T. Venkataraman
2020-08-19 18:53             ` Mickaël Salaün
2020-09-01 15:42               ` Mark Rutland [this message]

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