From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753342AbdJTXWJ (ORCPT ); Fri, 20 Oct 2017 19:22:09 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:24977 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752701AbdJTXWH (ORCPT ); Fri, 20 Oct 2017 19:22:07 -0400 Date: Sat, 21 Oct 2017 03:21:54 +0400 (+04) From: James Morris X-X-Sender: james.l.morris@t440 To: David Howells cc: linux-security-module@vger.kernel.org, gnomes@lxorguk.ukuu.org.uk, linux-efi@vger.kernel.org, matthew.garrett@nebula.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, jforbes@redhat.com Subject: Re: [PATCH 04/27] Restrict /dev/mem and /dev/kmem when the kernel is locked down In-Reply-To: <150842466261.7923.14359746674406637357.stgit@warthog.procyon.org.uk> Message-ID: References: <150842463163.7923.11081723749106843698.stgit@warthog.procyon.org.uk> <150842466261.7923.14359746674406637357.stgit@warthog.procyon.org.uk> User-Agent: Alpine 2.20 (LFD 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 19 Oct 2017, David Howells wrote: > From: Matthew Garrett > > Allowing users to write to address space makes it possible for the kernel to > be subverted, avoiding module loading restrictions. Prevent this when the > kernel has been locked down. > > Signed-off-by: Matthew Garrett > Signed-off-by: David Howells Reviewed-by: James Morris -- James Morris