From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01286C43381 for ; Tue, 26 Mar 2019 20:55:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C505220700 for ; Tue, 26 Mar 2019 20:55:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553633753; bh=boyJ3Buo2pPC9t7P96nVK4DIZZBxcZsfGGAPdiYwOqQ=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=Qu5gvEyEtO65szZZoRghgK1WneeyML/2uvl4xecvZjhLk6ixvDiqe7lrtVvIopglq Y2zeKn684XzOeogrsMyio/SMlVAsey/HM1jVgYbyBG8mcKQsJOQqp+YC36npzjp3gQ kt4rfFQbTHEhUxUf/8GBjaGuqG8Er17ZZDE0NqxE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732752AbfCZUzx (ORCPT ); Tue, 26 Mar 2019 16:55:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:34826 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732748AbfCZUzw (ORCPT ); Tue, 26 Mar 2019 16:55:52 -0400 Received: from mail-wm1-f47.google.com (mail-wm1-f47.google.com [209.85.128.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DDF5421738 for ; Tue, 26 Mar 2019 20:55:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553633752; bh=boyJ3Buo2pPC9t7P96nVK4DIZZBxcZsfGGAPdiYwOqQ=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=hDVTJCYYK+ctAydkulvCscDWHwdq3eXq7tlPLUds/HghYBvTIs3KUDaUvqwgQ1ty5 dzf5BqtRWoXTxDe8XsEg889M6uL0lIZ+BoFEis26j9aX+uct6AxWbhJe4zWjGCd8yY PRn9LyIHAHkS4sCxpOVE15svTfGYh7nsRV/xNSSI= Received: by mail-wm1-f47.google.com with SMTP id z11so14230434wmi.0 for ; Tue, 26 Mar 2019 13:55:51 -0700 (PDT) X-Gm-Message-State: APjAAAVa0h15uosOsyMQVh2y8sPYA1zoizPMu3C0i9f64QbJmOwmN6W/ Kq+s8ttUU/Xmn5ysU5RyHrRQcSiMQKxdG2aKTBeC1w== X-Google-Smtp-Source: APXvYqwiosCi1l4wHJhYr/e48fuZj9iPqzVTecVH+cFvt04RmxBfsTMTGOZpZrqZEJKMSUwN0Jd6MUpVgVsSf4WKe2Y= X-Received: by 2002:a05:600c:211a:: with SMTP id u26mr11751037wml.74.1553633750383; Tue, 26 Mar 2019 13:55:50 -0700 (PDT) MIME-Version: 1.0 References: <20190326182742.16950-1-matthewgarrett@google.com> <20190326182742.16950-11-matthewgarrett@google.com> In-Reply-To: <20190326182742.16950-11-matthewgarrett@google.com> From: Andy Lutomirski Date: Tue, 26 Mar 2019 13:55:39 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH V31 10/25] PCI: Lock down BAR access when the kernel is locked down To: Matthew Garrett Cc: James Morris , LSM List , LKML , David Howells , Linux API , Andrew Lutomirski , Matthew Garrett , Matthew Garrett , Bjorn Helgaas , linux-pci@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On Tue, Mar 26, 2019 at 11:28 AM Matthew Garrett wrote: > > From: Matthew Garrett > > Any hardware that can potentially generate DMA has to be locked down in > order to avoid it being possible for an attacker to modify kernel code, > allowing them to circumvent disabled module loading or module signing. > Default to paranoid - in future we can potentially relax this for > sufficiently IOMMU-isolated devices. Does this break vfio? --Andy