From patchwork Mon Nov 15 02:05:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolu Lu X-Patchwork-Id: 12618523 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA0B0C433EF for ; Mon, 15 Nov 2021 02:10:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C059061151 for ; Mon, 15 Nov 2021 02:10:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236276AbhKOCNn (ORCPT ); Sun, 14 Nov 2021 21:13:43 -0500 Received: from mga04.intel.com ([192.55.52.120]:50553 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236208AbhKOCNi (ORCPT ); Sun, 14 Nov 2021 21:13:38 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10168"; a="232086636" X-IronPort-AV: E=Sophos;i="5.87,235,1631602800"; d="scan'208";a="232086636" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Nov 2021 18:10:42 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,235,1631602800"; d="scan'208";a="505714566" Received: from allen-box.sh.intel.com ([10.239.159.118]) by orsmga008.jf.intel.com with ESMTP; 14 Nov 2021 18:10:37 -0800 From: Lu Baolu To: Greg Kroah-Hartman , Joerg Roedel , Alex Williamson , Bjorn Helgaas , Jason Gunthorpe , Kevin Tian , Ashok Raj Cc: Will Deacon , rafael@kernel.org, Diana Craciun , Cornelia Huck , Eric Auger , Liu Yi L , Jacob jun Pan , Chaitanya Kulkarni , iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH 03/11] PCI: pci_stub: Suppress kernel DMA ownership auto-claiming Date: Mon, 15 Nov 2021 10:05:44 +0800 Message-Id: <20211115020552.2378167-4-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211115020552.2378167-1-baolu.lu@linux.intel.com> References: <20211115020552.2378167-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org pci_stub allows the admin to block driver binding on a device and make it permanently shared with userspace. Since pci_stub does not do DMA, it is safe. However the admin must understand that using pci_stub allows userspace to attack whatever device it was bound to. Signed-off-by: Lu Baolu --- drivers/pci/pci-stub.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/pci-stub.c b/drivers/pci/pci-stub.c index e408099fea52..6324c68602b4 100644 --- a/drivers/pci/pci-stub.c +++ b/drivers/pci/pci-stub.c @@ -36,6 +36,9 @@ static struct pci_driver stub_driver = { .name = "pci-stub", .id_table = NULL, /* only dynamic id's */ .probe = pci_stub_probe, + .driver = { + .suppress_auto_claim_dma_owner = true, + }, }; static int __init pci_stub_init(void)