diff options
Diffstat (limited to 'vfio-iommu-Fixed-interaction-of-VFIO_IOMMU_MAP_DMA.patch')
| -rw-r--r-- | vfio-iommu-Fixed-interaction-of-VFIO_IOMMU_MAP_DMA.patch | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/vfio-iommu-Fixed-interaction-of-VFIO_IOMMU_MAP_DMA.patch b/vfio-iommu-Fixed-interaction-of-VFIO_IOMMU_MAP_DMA.patch deleted file mode 100644 index 0b5fa8a7..00000000 --- a/vfio-iommu-Fixed-interaction-of-VFIO_IOMMU_MAP_DMA.patch +++ /dev/null @@ -1,39 +0,0 @@ -From: Julian Stecklina <jsteckli@os.info.tu-dresden.de> -Subject: [PATCH] vfio, iommu: Fixed interaction of VFIO_IOMMU_MAP_DMA with IOMMU address limits - -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 <jsteckli@os.inf.tu-dresden.de> ---- - drivers/iommu/intel-iommu.c | 6 +++++- - 1 file changed, 5 insertions(+), 1 deletion(-) - -diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c -index eec0d3e..61303db 100644 ---- a/drivers/iommu/intel-iommu.c -+++ b/drivers/iommu/intel-iommu.c -@@ -782,7 +782,11 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain, - int offset; - - BUG_ON(!domain->pgd); -- BUG_ON(addr_width < BITS_PER_LONG && pfn >> addr_width); -+ -+ if (addr_width < BITS_PER_LONG && pfn >> addr_width) -+ /* Address beyond IOMMU's addressing capabilities. */ -+ return NULL; -+ - parent = domain->pgd; - - while (level > 0) { --- -1.8.3.1 |