uio/uio_pci_generic: Disable bus-mastering on release

Userspace code using uio_pci_generic may enable bus-mastering by
directly manipulating a PCI device's command register. If a userspace
program enables bus-mastering but exits/crashes uncleanly, bus-
mastering will still be enabled and stale DMA addresses may be
programmed and live in the device.

Disable bus-mastering unconditionally on last close of a UIO PCI fd
to avoid this. If the device did not have bus-mastering enabled,
pci_clear_master() is a no-op.

Signed-off-by: Venkatesh Srinivas <venkateshs@google.com>
Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Catherine Sullivan <csully@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
index 8773e373ffe5..dde5cbb27178 100644
--- a/drivers/uio/uio_pci_generic.c
+++ b/drivers/uio/uio_pci_generic.c
@@ -39,6 +39,22 @@ to_uio_pci_generic_dev(struct uio_info *info)
         return container_of(info, struct uio_pci_generic_dev, info);
 }
 
+static int release(struct uio_info *info, struct inode *inode)
+{
+        struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info);
+
+        /*
+         * This driver is insecure when used with devices doing DMA, but some
+         * people (mis)use it with such devices.
+         * Let's at least make sure DMA isn't left enabled after the userspace
+         * driver closes the fd.
+         * Note that there's a non-zero chance doing this will wedge the device
+         * at least until reset.
+         */
+        pci_clear_master(gdev->pdev);
+        return 0;
+}
+
 /* Interrupt handler. Read/modify/write the command register to disable
  * the interrupt. */
 static irqreturn_t irqhandler(int irq, struct uio_info *info)
@@ -78,6 +94,7 @@ static int probe(struct pci_dev *pdev,
 
         gdev->info.name = "uio_pci_generic";
         gdev->info.version = DRIVER_VERSION;
+        gdev->info.release = release;
         gdev->pdev = pdev;
         if (pdev->irq) {
                 gdev->info.irq = pdev->irq;