From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A6F0C43381 for ; Thu, 21 Mar 2019 13:43:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CEADB2083D for ; Thu, 21 Mar 2019 13:43:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553175827; bh=tPXTA3tExjHYvCl0U8yOGW77eTnvySzweHtIvbC5220=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=vXnENeofF+LQmnG1sHIj9kb3xyX9C7Rx7ikiUA4GqFLUaJ8Jp0sBK2wTPct6XMQg9 1gG+NReOTfFSoohm1/KsJgJC4uwiUpS2MtiyZRqYFdjCxMTDs2revrcbokujNg2Jbm HqUunjCGQOOIdm3ye33EYjQ2IffrU5BO5ljNDWQs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728554AbfCUNnm (ORCPT ); Thu, 21 Mar 2019 09:43:42 -0400 Received: from mail-yw1-f66.google.com ([209.85.161.66]:46058 "EHLO mail-yw1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727829AbfCUNnl (ORCPT ); Thu, 21 Mar 2019 09:43:41 -0400 Received: by mail-yw1-f66.google.com with SMTP id j128so4747138ywg.12; Thu, 21 Mar 2019 06:43:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=tPXTA3tExjHYvCl0U8yOGW77eTnvySzweHtIvbC5220=; b=OyEWuiy1xHqsTxV0pslZuOu1930UBKZG875Hd6Qu1K/WllqMBmBnBdnkC9L2pZgUVh irqScVS951ENbHK6FbV1pJGs247D5ir8mxQukgXhVAT8p21pex3WlVihF/WM1qHSc7jp Jm3YPkh6CWKVWDq4aUM++i1LeU54Qdc036Hz6EVBq7DSshF3Tnr3lfKm3PpCiSSDeu3N efVCnPP4a0Mg57jUfLsIfcmAAlb93Zbef2N3YpM9HCt3wwX5pqPzjzDtULoip4txLA1l FRxZVmNeoa858zmeZOp6essQVrFZEF6j2sMUaI8IX/cj9gncyRQn3cSAPwc7nO7w+DvT QzBg== X-Gm-Message-State: APjAAAX9XrlrbPfelrM24WGsZ7uEWlFmSHx6NQ9O7LQOvEM+k26qVf/V b+PbtmM0EyJlNQuwV9E/HTyz06I+1Jk= X-Google-Smtp-Source: APXvYqw5PwOhd1NNd08+tnqkHFD93x8/dvdvJETQt4RzUQYDXMzJx9lmCJfqJW5NDLyJjwUYL9lIQA== X-Received: by 2002:a81:2748:: with SMTP id n69mr3162674ywn.70.1553175820774; Thu, 21 Mar 2019 06:43:40 -0700 (PDT) Received: from 42.do-not-panic.com (42.do-not-panic.com. [157.230.128.187]) by smtp.gmail.com with ESMTPSA id v77sm3451008ywv.79.2019.03.21.06.43.36 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 21 Mar 2019 06:43:39 -0700 (PDT) Received: by 42.do-not-panic.com (sSMTP sendmail emulation); Thu, 21 Mar 2019 13:43:35 +0000 Date: Thu, 21 Mar 2019 13:43:35 +0000 From: Luis Chamberlain To: Andrea Arcangeli Cc: "Dr. David Alan Gilbert" , Andrew Morton , Peter Xu , linux-kernel@vger.kernel.org, Paolo Bonzini , Hugh Dickins , Maxime Coquelin , Maya Gokhale , Jerome Glisse , Pavel Emelyanov , Johannes Weiner , Martin Cracauer , Denis Plotnikov , linux-mm@kvack.org, Marty McFadden , Mike Kravetz , Mike Rapoport , Kees Cook , Mel Gorman , "Kirill A . Shutemov" , linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH v2 1/1] userfaultfd/sysctl: add vm.unprivileged_userfaultfd Message-ID: <20190321134335.GB1146@42.do-not-panic.com> References: <20190319030722.12441-1-peterx@redhat.com> <20190319030722.12441-2-peterx@redhat.com> <20190319110236.b6169d6b469a587a852c7e09@linux-foundation.org> <20190319182822.GK2727@work-vm> <20190320190112.GD23793@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190320190112.GD23793@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Wed, Mar 20, 2019 at 03:01:12PM -0400, Andrea Arcangeli wrote: > but > that would be better be achieved through SECCOMP and not globally.'. That begs the question why not use seccomp for this? What if everyone decided to add a knob for all syscalls to do the same? For the commit log, why is it OK then to justify a knob for this syscall? Luis