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SubjectRe: [PATCH v12 6/6] iommu/vt-d: Check UAPI data processed by IOMMU core
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Hi Jacob,

On 9/25/20 6:32 PM, Jacob Pan wrote:
> IOMMU generic layer already does sanity checks on UAPI data for version
> match and argsz range based on generic information.
>
> This patch adjusts the following data checking responsibilities:
> - removes the redundant version check from VT-d driver
> - removes the check for vendor specific data size
> - adds check for the use of reserved/undefined flags
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric
> ---
> drivers/iommu/intel/iommu.c | 3 +--
> drivers/iommu/intel/svm.c | 11 +++++++++--
> include/uapi/linux/iommu.h | 1 +
> 3 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 461f3a6864d4..18ed3b3c70d7 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -5408,8 +5408,7 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev,
> int ret = 0;
> u64 size = 0;
>
> - if (!inv_info || !dmar_domain ||
> - inv_info->version != IOMMU_CACHE_INVALIDATE_INFO_VERSION_1)
> + if (!inv_info || !dmar_domain)
> return -EINVAL;
>
> if (!dev || !dev_is_pci(dev))
> diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
> index 99353d6468fa..0cb9a15f1112 100644
> --- a/drivers/iommu/intel/svm.c
> +++ b/drivers/iommu/intel/svm.c
> @@ -284,8 +284,15 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
> if (WARN_ON(!iommu) || !data)
> return -EINVAL;
>
> - if (data->version != IOMMU_GPASID_BIND_VERSION_1 ||
> - data->format != IOMMU_PASID_FORMAT_INTEL_VTD)
> + if (data->format != IOMMU_PASID_FORMAT_INTEL_VTD)
> + return -EINVAL;
> +
> + /* IOMMU core ensures argsz is more than the start of the union */
> + if (data->argsz < offsetofend(struct iommu_gpasid_bind_data, vendor.vtd))
> + return -EINVAL;
> +
> + /* Make sure no undefined flags are used in vendor data */
> + if (data->vendor.vtd.flags & ~(IOMMU_SVA_VTD_GPASID_LAST - 1))
> return -EINVAL;
>
> if (!dev_is_pci(dev))
> diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
> index 66d4ca40b40f..e1d9e75f2c94 100644
> --- a/include/uapi/linux/iommu.h
> +++ b/include/uapi/linux/iommu.h
> @@ -288,6 +288,7 @@ struct iommu_gpasid_bind_data_vtd {
> #define IOMMU_SVA_VTD_GPASID_PWT (1 << 3) /* page-level write through */
> #define IOMMU_SVA_VTD_GPASID_EMTE (1 << 4) /* extended mem type enable */
> #define IOMMU_SVA_VTD_GPASID_CD (1 << 5) /* PASID-level cache disable */
> +#define IOMMU_SVA_VTD_GPASID_LAST (1 << 6)
> __u64 flags;
> __u32 pat;
> __u32 emt;
>

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