On Wed, Oct 09, 2013 at 10:03:52AM +0200, Julian Stecklina wrote: > The BUG_ON in drivers/iommu/intel-iommu.c:785 can be triggered from userspace > via > VFIO by calling the VFIO_IOMMU_MAP_DMA ioctl on a vfio device with any address > beyond the addressing capabilities of the IOMMU. The problem is that the > ioctl code > calls iommu_iova_to_phys before it calls iommu_map. iommu_map handles the > case that > it gets addresses beyond the addressing capabilities of its IOMMU. > intel_iommu_iova_to_phys does not. > > This patch fixes iommu_iova_to_phys to return NULL for addresses beyond what > the > IOMMU can handle. This in turn causes the ioctl call to fail in iommu_map and > (correctly) return EFAULT to the user with a helpful warning message in the > kernel > log. > > Signed-off-by: Julian Stecklina <jstec...@os.inf.tu-dresden.de> > Acked-by: Alex Williamson <alex.william...@redhat.com>
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