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vfio/pci: Add device denylist

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Add denylist of devices that by default are not probed by vfio-pci.
Devices in this list may be susceptible to untrusted application, even
if the IOMMU is enabled. To be accessed via vfio-pci, the user has to
explicitly disable the denylist.

The denylist can be disabled via the module parameter disable_denylist.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Fiona Trahe <fiona.trahe@intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Giovanni Cabiddu 2020-07-27 13:43:40 -06:00 committed by Alex Williamson
parent 8b7beaf9f1
commit 1f97970e6c
1 changed files with 33 additions and 0 deletions
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33
drivers/vfio/pci/vfio_pci.c
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@ -60,6 +60,10 @@ module_param(enable_sriov, bool, 0644);
MODULE_PARM_DESC(enable_sriov, "Enable support for SR-IOV configuration. Enabling SR-IOV on a PF typically requires support of the userspace PF driver, enabling VFs without such support may result in non-functional VFs or PF.");
#endif
static bool disable_denylist;
module_param(disable_denylist, bool, 0444);
MODULE_PARM_DESC(disable_denylist, "Disable use of device denylist. Disabling the denylist allows binding to devices with known errata that may lead to exploitable stability or security issues when accessed by untrusted users.");
static inline bool vfio_vga_disabled(void)
{
#ifdef CONFIG_VFIO_PCI_VGA
@ -69,6 +73,29 @@ static inline bool vfio_vga_disabled(void)
#endif
}
static bool vfio_pci_dev_in_denylist(struct pci_dev *pdev)
{
return false;
}
static bool vfio_pci_is_denylisted(struct pci_dev *pdev)
{
if (!vfio_pci_dev_in_denylist(pdev))
return false;
if (disable_denylist) {
pci_warn(pdev,
"device denylist disabled - allowing device %04x:%04x.\n",
pdev->vendor, pdev->device);
return false;
}
pci_warn(pdev, "%04x:%04x exists in vfio-pci device denylist, driver probing disallowed.\n",
pdev->vendor, pdev->device);
return true;
}
/*
* Our VGA arbiter participation is limited since we don't know anything
* about the device itself. However, if the device is the only VGA device
@ -1856,6 +1883,9 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
struct iommu_group *group;
int ret;
if (vfio_pci_is_denylisted(pdev))
return -EINVAL;
if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
return -EINVAL;
@ -2345,6 +2375,9 @@ static int __init vfio_pci_init(void)
vfio_pci_fill_ids();
if (disable_denylist)
pr_warn("device denylist disabled.\n");
return 0;
out_driver: