diff options
| author | Jacob Pan <jacob.pan.linux@gmail.com> | 2020-09-25 09:32:46 -0700 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2020-10-01 14:52:46 +0200 |
| commit | d90573812eea63c6bc8ab8a38f661b4c27c3cdc0 (patch) | |
| tree | fdfa6af56469682974fee6617d55c047dc599a66 /include/linux/iommu.h | |
| parent | 23cc3493b5e107b8deb697cf3157a07276b5eff7 (diff) | |
iommu/uapi: Handle data and argsz filled by users
IOMMU user APIs are responsible for processing user data. This patch
changes the interface such that user pointers can be passed into IOMMU
code directly. Separate kernel APIs without user pointers are introduced
for in-kernel users of the UAPI functionality.
IOMMU UAPI data has a user filled argsz field which indicates the data
length of the structure. User data is not trusted, argsz must be
validated based on the current kernel data size, mandatory data size,
and feature flags.
User data may also be extended, resulting in possible argsz increase.
Backward compatibility is ensured based on size and flags (or
the functional equivalent fields) checking.
This patch adds sanity checks in the IOMMU layer. In addition to argsz,
reserved/unused fields in padding, flags, and version are also checked.
Details are documented in Documentation/userspace-api/iommu.rst
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/1601051567-54787-6-git-send-email-jacob.jun.pan@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index d18de2afa6fb..82876f682367 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -426,11 +426,14 @@ extern void iommu_detach_device(struct iommu_domain *domain, struct device *dev); extern int iommu_uapi_cache_invalidate(struct iommu_domain *domain, struct device *dev, - struct iommu_cache_invalidate_info *inv_info); + void __user *uinfo); + extern int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain, - struct device *dev, struct iommu_gpasid_bind_data *data); + struct device *dev, void __user *udata); extern int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain, - struct device *dev, ioasid_t pasid); + struct device *dev, void __user *udata); +extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain, + struct device *dev, ioasid_t pasid); extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); extern struct iommu_domain *iommu_get_dma_domain(struct device *dev); extern int iommu_map(struct iommu_domain *domain, unsigned long iova, @@ -1032,22 +1035,29 @@ static inline int iommu_sva_get_pasid(struct iommu_sva *handle) return IOMMU_PASID_INVALID; } -static inline int iommu_uapi_cache_invalidate(struct iommu_domain *domain, - struct device *dev, - struct iommu_cache_invalidate_info *inv_info) +static inline int +iommu_uapi_cache_invalidate(struct iommu_domain *domain, + struct device *dev, + struct iommu_cache_invalidate_info *inv_info) { return -ENODEV; } static inline int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain, - struct device *dev, - struct iommu_gpasid_bind_data *data) + struct device *dev, void __user *udata) { return -ENODEV; } static inline int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain, - struct device *dev, int pasid) + struct device *dev, void __user *udata) +{ + return -ENODEV; +} + +static inline int iommu_sva_unbind_gpasid(struct iommu_domain *domain, + struct device *dev, + ioasid_t pasid) { return -ENODEV; } |