[PATCH kernel v7 06/31] vfio: powerpc/spapr: Disable DMA mappings on disabled container
From: Alexey Kardashevskiy <hidden>
Date: 2015-03-27 14:57:09
Also in:
lkml
Subsystem:
ibm power vfio support, the rest, vfio driver · Maintainers:
Timothy Pearson, Linus Torvalds, Alex Williamson
At the moment DMA map/unmap requests are handled irrespective to the container's state. This allows the user space to pin memory which it might not be allowed to pin. This adds checks to MAP/UNMAP that the container is enabled, otherwise -EPERM is returned. Signed-off-by: Alexey Kardashevskiy <redacted> --- drivers/vfio/vfio_iommu_spapr_tce.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 9448e39..c137bb3 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c@@ -325,6 +325,9 @@ static long tce_iommu_ioctl(void *iommu_data, struct iommu_table *tbl = container->tbl; unsigned long tce; + if (!container->enabled) + return -EPERM; + if (!tbl) return -ENXIO;
@@ -369,6 +372,9 @@ static long tce_iommu_ioctl(void *iommu_data, struct vfio_iommu_type1_dma_unmap param; struct iommu_table *tbl = container->tbl; + if (!container->enabled) + return -EPERM; + if (WARN_ON(!tbl)) return -ENXIO;
--
2.0.0