iommu/vt-d: Don't apply gfx quirks to untrusted devices

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Currently, an external malicious PCI device can masquerade the VID:PID
of faulty gfx devices, and thus apply iommu quirks to effectively
disable the IOMMU restrictions for itself.

Thus we need to ensure that the device we are applying quirks to, is
indeed an internal trusted device.

Signed-off-by: Rajat Jain <rajatja@google.com>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20200622231345.29722-4-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Rajat Jain 2020-06-23 07:13:42 +08:00 • committed by Joerg Roedel

parent 16ecf10e81

commit 67e8a5b18d

1 changed files with 37 additions and 0 deletions

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drivers/iommu/intel/iommu.c

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