From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Morris Subject: Re: [PATCH 04/27] Restrict /dev/mem and /dev/kmem when the kernel is locked down Date: Sat, 21 Oct 2017 03:21:54 +0400 (+04) Message-ID: References: <150842463163.7923.11081723749106843698.stgit@warthog.procyon.org.uk> <150842466261.7923.14359746674406637357.stgit@warthog.procyon.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Return-path: In-Reply-To: <150842466261.7923.14359746674406637357.stgit@warthog.procyon.org.uk> Sender: linux-kernel-owner@vger.kernel.org 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 List-Id: linux-efi@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