Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1752658AbaG0VGo (ORCPT <rfc822;w@1wt.eu>);
	Sun, 27 Jul 2014 17:06:44 -0400
Received: from imap.thunk.org ([74.207.234.97]:59504 "EHLO imap.thunk.org"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1752524AbaG0VGk (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Sun, 27 Jul 2014 17:06:40 -0400
Date: Sun, 27 Jul 2014 17:06:17 -0400
From: "Theodore Ts'o" <tytso@mit.edu>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        Julien Tinnes <jln@google.com>, David Drysdale <drysdale@google.com>,
        Al Viro <viro@zeniv.linux.org.uk>, Paolo Bonzini <pbonzini@redhat.com>,
        LSM List <linux-security-module@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Paul Moore <paul@paul-moore.com>,
        James Morris <james.l.morris@oracle.com>,
        Linux API <linux-api@vger.kernel.org>,
        Meredydd Luff <meredydd@senatehouse.org>,
        Christoph Hellwig <hch@infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
        linux-crypto@vger.kernel.org
Subject: Re: General flags to turn things off (getrandom, pid lookup, etc)
Message-ID: <20140727210617.GY6725@thunk.org>
Mail-Followup-To: Theodore Ts'o <tytso@mit.edu>,
	Andy Lutomirski <luto@amacapital.net>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Julien Tinnes <jln@google.com>,
	David Drysdale <drysdale@google.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Paolo Bonzini <pbonzini@redhat.com>,
	LSM List <linux-security-module@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Paul Moore <paul@paul-moore.com>,
	James Morris <james.l.morris@oracle.com>,
	Linux API <linux-api@vger.kernel.org>,
	Meredydd Luff <meredydd@senatehouse.org>,
	Christoph Hellwig <hch@infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
	linux-crypto@vger.kernel.org
References: <CALCETrWGvBfrX1W5XaFgJZhKHLf+oac9YrwPR3ppK=deQtu5hA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CALCETrWGvBfrX1W5XaFgJZhKHLf+oac9YrwPR3ppK=deQtu5hA@mail.gmail.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-SA-Exim-Connect-IP: <locally generated>
X-SA-Exim-Mail-From: tytso@thunk.org
X-SA-Exim-Scanned: No (on imap.thunk.org); SAEximRunCond expanded to false
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, Jul 25, 2014 at 11:30:48AM -0700, Andy Lutomirski wrote:
> 
> There is recent interest in having a way to turn generally-available
> kernel features off.  Maybe we should add a good one so we can stop
> bikeshedding and avoid proliferating dumb interfaces.

I believe the seccomp infrastructure (which is already upstream)
should be able to do most of what you want, at least with respect to
features which are exposed via system calls (which was most of your
list).

It won't cover x86 specific things like restricting RDTSC or CPUID
(and as far as I know you can't intercept the CPUID instruction), but
I'm not sure it matters.  I don't really see the point, myself.

    	     		    	  	 - Ted
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/