Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp649603imu;
        Thu, 13 Dec 2018 01:58:40 -0800 (PST)
X-Google-Smtp-Source: AFSGD/XmDW1A/JQ4Fo4zFwr6iU0yT/4FsHQ5iKAGHDFfXoV8kmI2/pTboQGPl+xcQ/1lUmb12JxH
X-Received: by 2002:aa7:868f:: with SMTP id d15mr23102714pfo.225.1544695120726;
        Thu, 13 Dec 2018 01:58:40 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1544695120; cv=none;
        d=google.com; s=arc-20160816;
        b=bc9KSjWEBY5BA265M7kJz7hmPl/v0QxYoJJ28u7wbwo5HAwa8Ki2/6YfsQ+APYWPkE
         Zo8mh+kenvRmPKL47AUz3KZtIGt0+05b1E+9hKEzHb6ReY+Wgiq4I2cskd9iJmrejzXv
         R33KDn3pOaK/fIsA2Gsdgv5ZvGxfluGqLk5GK4B008U5bUh6kX6+hAGz2QT+lUXwztDj
         wC8gbhxJRyHn//ZAyjWy08kQuUBKP6+d2GyS6cVYVufp7ceYQZqWiX4Y62OKMbUDMvNw
         6GARNiTncRxPhVX3cybH8vC0XgURyc0vF7z5BZzG5cTsMacUQNrThnSDuze1ggCxT52y
         DxjQ==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=list-id:precedence:sender:user-agent:in-reply-to
         :content-transfer-encoding:content-disposition:mime-version
         :references:message-id:subject:cc:to:from:date;
        bh=ghJ6YoaHzT2aAiIDGCN8LprmEZS2LFtMajv54b4V9EU=;
        b=gQOIixHoWRteuoftx4OnEZd+84BtGKSyhkkHrltDKKfpyHH06DkdQFqDxAothyczrS
         fBtXGzQM/IvrhAdSXJdJLYYKWJ6Z3XiS1hn/l36SDekKLq+G2qdrlIWRcvtK2RIT6YsI
         nnc/b6iuEN0W6tmJE8BjMbNQkkhqRBBtFbCHvhf54WZUJsz/tU4QSteg9YWMeOPhCycz
         ag8soXq31EBQraNNtGm6HXqdLOl5hZTgdN+Id31G/ikDDTOuyvYEjKIjw3H+IQj7s7jR
         Vs+ktsTLvzHxE0oqpYx45jOzt75522fUJF6YLyVJT+reFh8LaDeU/utZUcWrenU+1aCn
         HpVg==
ARC-Authentication-Results: i=1; mx.google.com;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67])
        by mx.google.com with ESMTP id t74si1284368pgc.150.2018.12.13.01.58.25;
        Thu, 13 Dec 2018 01:58:40 -0800 (PST)
Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Authentication-Results: mx.google.com;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1727749AbeLMJ51 (ORCPT <rfc822;chaneybenjamini@gmail.com>
        + 99 others); Thu, 13 Dec 2018 04:57:27 -0500
Received: from tartarus.angband.pl ([54.37.238.230]:47844 "EHLO
        tartarus.angband.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1727210AbeLMJ50 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 13 Dec 2018 04:57:26 -0500
Received: from kilobyte by tartarus.angband.pl with local (Exim 4.89)
        (envelope-from <kilobyte@angband.pl>)
        id 1gXNkD-0002RV-0E; Thu, 13 Dec 2018 10:57:25 +0100
Date:   Thu, 13 Dec 2018 10:57:24 +0100
From:   Adam Borowski <kilobyte@angband.pl>
To:     Sven Hartrumpf <hartrumpf@gmx.net>
Cc:     linux-kernel@vger.kernel.org
Subject: Re: Can we drop upstream Linux x32 support?
Message-ID: <20181213095724.f4ziawroveksd35t@angband.pl>
References: <70bb54b2-8ed3-b5ee-c02d-6ef66c4f27eb@physik.fu-berlin.de>
 <20181213050313.GA21201@ip-172-31-15-78>
 <CAFLxGvy2sMW1nyMpxGN7xHPdUea713g89MdE3EcUNHJDCvZ3jA@mail.gmail.com>
 <20181213.103731.734229932284065893.hartrumpf@gmx.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20181213.103731.734229932284065893.hartrumpf@gmx.net>
X-Junkbait: aaron@angband.pl, zzyx@angband.pl
User-Agent: NeoMutt/20170113 (1.7.2)
X-SA-Exim-Connect-IP: <locally generated>
X-SA-Exim-Mail-From: kilobyte@angband.pl
X-SA-Exim-Scanned: No (on tartarus.angband.pl); SAEximRunCond expanded to false
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thu, Dec 13, 2018 at 10:37:31AM +0100, Sven Hartrumpf wrote:
> Will the proposed patch ("only") remove the possibility to build x32 kernels
> or will it make impossible to compile and run any x32 binaries?

There's no such thing as x32 kernels.  It's an ABI atop amd64 kernels; the
kernel is always 64-bit -- short pointers apply only to userspace and
syscalls.

It could be interesting to block regular amd64 syscalls and leave x32 only
-- for "security through rarity", but the kernel itself would still look the
same.


Meow!
-- 
⢀⣴⠾⠻⢶⣦⠀ 
⣾⠁⢠⠒⠀⣿⡁ Ivan was a worldly man: born in St. Petersburg, raised in
⢿⡄⠘⠷⠚⠋⠀ Petrograd, lived most of his life in Leningrad, then returned
⠈⠳⣄⠀⠀⠀⠀ to the city of his birth to die.