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Subject[PATCH kernel v6 06/29] vfio: powerpc/spapr: Disable DMA mappings on disabled container
Date
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 <aik@ozlabs.ru>
---
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 c47b969..8a667cb 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -327,6 +327,9 @@ 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;

@@ -371,6 +374,9 @@ 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


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