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Thu, 5 Apr 2018 14:00:15 -0400 Received: from www.llwyncelyn.cymru ([82.70.14.225]:51566 "EHLO fuzix.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751318AbeDESAO (ORCPT ); Thu, 5 Apr 2018 14:00:14 -0400 Date: Thu, 5 Apr 2018 18:59:49 +0100 From: Alan Cox To: Matthew Garrett Cc: Linus Torvalds , luto@kernel.org, David Howells , Ard Biesheuvel , jmorris@namei.org, Greg Kroah-Hartman , Linux Kernel Mailing List , jforbes@redhat.com, linux-man@vger.kernel.org, jlee@suse.com, LSM List , linux-api@vger.kernel.org, Kees Cook , linux-efi Subject: Re: [GIT PULL] Kernel lockdown for secure boot Message-ID: <20180405185949.309216bb@alans-desktop> In-Reply-To: References: <4136.1522452584@warthog.procyon.org.uk> <13189.1522784944@warthog.procyon.org.uk> <9349.1522794769@warthog.procyon.org.uk> Organization: Intel Corporation X-Mailer: Claws Mail 3.15.1-dirty (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: > How? When there are random DMA-capable PCI devices that are driven by > userland tools that are mmap()ing the BARs out of sysfs, how do we > simultaneously avoid breaking those devices while also preventing the > majority of users from being vulnerable to an attacker just DMAing over the > kernel? VT-D