linux-kernel - Re: [GIT PULL] Kernel lockdown for secure boot

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Message-ID: <20180405185949.309216bb@alans-desktop>
Date:   Thu, 5 Apr 2018 18:59:49 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Matthew Garrett <mjg59@...gle.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>, luto@...nel.org,
        David Howells <dhowells@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>, jmorris@...ei.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jforbes@...hat.com, linux-man@...r.kernel.org, jlee@...e.com,
        LSM List <linux-security-module@...r.kernel.org>,
        linux-api@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        linux-efi <linux-efi@...r.kernel.org>
Subject: Re: [GIT PULL] Kernel lockdown for secure boot


> 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