linux-kernel - [PATCH 03/11] PCI: pci_stub: Suppress kernel DMA ownership auto-claiming

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Message-Id: <20211115020552.2378167-4-baolu.lu@linux.intel.com>
Date:   Mon, 15 Nov 2021 10:05:44 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>
Cc:     Will Deacon <will@...nel.org>, rafael@...nel.org,
        Diana Craciun <diana.craciun@....nxp.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 03/11] PCI: pci_stub: Suppress kernel DMA ownership auto-claiming

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 <baolu.lu@...ux.intel.com>
---
 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)
-- 
2.25.1