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-rw-r--r--drivers/iommu/iommu.c194
-rw-r--r--include/linux/iommu.h28
-rw-r--r--include/uapi/linux/iommu.h1
3 files changed, 207 insertions, 16 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index e412a0abfefa..6d847027d35e 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1961,34 +1961,214 @@ out_unlock:
}
EXPORT_SYMBOL_GPL(iommu_attach_device);
+/*
+ * Check flags and other user provided data for valid combinations. We also
+ * make sure no reserved fields or unused flags are set. This is to ensure
+ * not breaking userspace in the future when these fields or flags are used.
+ */
+static int iommu_check_cache_invl_data(struct iommu_cache_invalidate_info *info)
+{
+ u32 mask;
+ int i;
+
+ if (info->version != IOMMU_CACHE_INVALIDATE_INFO_VERSION_1)
+ return -EINVAL;
+
+ mask = (1 << IOMMU_CACHE_INV_TYPE_NR) - 1;
+ if (info->cache & ~mask)
+ return -EINVAL;
+
+ if (info->granularity >= IOMMU_INV_GRANU_NR)
+ return -EINVAL;
+
+ switch (info->granularity) {
+ case IOMMU_INV_GRANU_ADDR:
+ if (info->cache & IOMMU_CACHE_INV_TYPE_PASID)
+ return -EINVAL;
+
+ mask = IOMMU_INV_ADDR_FLAGS_PASID |
+ IOMMU_INV_ADDR_FLAGS_ARCHID |
+ IOMMU_INV_ADDR_FLAGS_LEAF;
+
+ if (info->granu.addr_info.flags & ~mask)
+ return -EINVAL;
+ break;
+ case IOMMU_INV_GRANU_PASID:
+ mask = IOMMU_INV_PASID_FLAGS_PASID |
+ IOMMU_INV_PASID_FLAGS_ARCHID;
+ if (info->granu.pasid_info.flags & ~mask)
+ return -EINVAL;
+
+ break;
+ case IOMMU_INV_GRANU_DOMAIN:
+ if (info->cache & IOMMU_CACHE_INV_TYPE_DEV_IOTLB)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Check reserved padding fields */
+ for (i = 0; i < sizeof(info->padding); i++) {
+ if (info->padding[i])
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
int iommu_uapi_cache_invalidate(struct iommu_domain *domain, struct device *dev,
- struct iommu_cache_invalidate_info *inv_info)
+ void __user *uinfo)
{
+ struct iommu_cache_invalidate_info inv_info = { 0 };
+ u32 minsz;
+ int ret;
+
if (unlikely(!domain->ops->cache_invalidate))
return -ENODEV;
- return domain->ops->cache_invalidate(domain, dev, inv_info);
+ /*
+ * No new spaces can be added before the variable sized union, the
+ * minimum size is the offset to the union.
+ */
+ minsz = offsetof(struct iommu_cache_invalidate_info, granu);
+
+ /* Copy minsz from user to get flags and argsz */
+ if (copy_from_user(&inv_info, uinfo, minsz))
+ return -EFAULT;
+
+ /* Fields before the variable size union are mandatory */
+ if (inv_info.argsz < minsz)
+ return -EINVAL;
+
+ /* PASID and address granu require additional info beyond minsz */
+ if (inv_info.granularity == IOMMU_INV_GRANU_PASID &&
+ inv_info.argsz < offsetofend(struct iommu_cache_invalidate_info, granu.pasid_info))
+ return -EINVAL;
+
+ if (inv_info.granularity == IOMMU_INV_GRANU_ADDR &&
+ inv_info.argsz < offsetofend(struct iommu_cache_invalidate_info, granu.addr_info))
+ return -EINVAL;
+
+ /*
+ * User might be using a newer UAPI header which has a larger data
+ * size, we shall support the existing flags within the current
+ * size. Copy the remaining user data _after_ minsz but not more
+ * than the current kernel supported size.
+ */
+ if (copy_from_user((void *)&inv_info + minsz, uinfo + minsz,
+ min_t(u32, inv_info.argsz, sizeof(inv_info)) - minsz))
+ return -EFAULT;
+
+ /* Now the argsz is validated, check the content */
+ ret = iommu_check_cache_invl_data(&inv_info);
+ if (ret)
+ return ret;
+
+ return domain->ops->cache_invalidate(domain, dev, &inv_info);
}
EXPORT_SYMBOL_GPL(iommu_uapi_cache_invalidate);
-int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain,
- struct device *dev, struct iommu_gpasid_bind_data *data)
+static int iommu_check_bind_data(struct iommu_gpasid_bind_data *data)
+{
+ u32 mask;
+ int i;
+
+ if (data->version != IOMMU_GPASID_BIND_VERSION_1)
+ return -EINVAL;
+
+ /* Check the range of supported formats */
+ if (data->format >= IOMMU_PASID_FORMAT_LAST)
+ return -EINVAL;
+
+ /* Check all flags */
+ mask = IOMMU_SVA_GPASID_VAL;
+ if (data->flags & ~mask)
+ return -EINVAL;
+
+ /* Check reserved padding fields */
+ for (i = 0; i < sizeof(data->padding); i++) {
+ if (data->padding[i])
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int iommu_sva_prepare_bind_data(void __user *udata,
+ struct iommu_gpasid_bind_data *data)
+{
+ u32 minsz;
+
+ /*
+ * No new spaces can be added before the variable sized union, the
+ * minimum size is the offset to the union.
+ */
+ minsz = offsetof(struct iommu_gpasid_bind_data, vendor);
+
+ /* Copy minsz from user to get flags and argsz */
+ if (copy_from_user(data, udata, minsz))
+ return -EFAULT;
+
+ /* Fields before the variable size union are mandatory */
+ if (data->argsz < minsz)
+ return -EINVAL;
+ /*
+ * User might be using a newer UAPI header, we shall let IOMMU vendor
+ * driver decide on what size it needs. Since the guest PASID bind data
+ * can be vendor specific, larger argsz could be the result of extension
+ * for one vendor but it should not affect another vendor.
+ * Copy the remaining user data _after_ minsz
+ */
+ if (copy_from_user((void *)data + minsz, udata + minsz,
+ min_t(u32, data->argsz, sizeof(*data)) - minsz))
+ return -EFAULT;
+
+ return iommu_check_bind_data(data);
+}
+
+int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain, struct device *dev,
+ void __user *udata)
{
+ struct iommu_gpasid_bind_data data = { 0 };
+ int ret;
+
if (unlikely(!domain->ops->sva_bind_gpasid))
return -ENODEV;
- return domain->ops->sva_bind_gpasid(domain, dev, data);
+ ret = iommu_sva_prepare_bind_data(udata, &data);
+ if (ret)
+ return ret;
+
+ return domain->ops->sva_bind_gpasid(domain, dev, &data);
}
EXPORT_SYMBOL_GPL(iommu_uapi_sva_bind_gpasid);
-int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev,
- ioasid_t pasid)
+int iommu_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev,
+ ioasid_t pasid)
{
if (unlikely(!domain->ops->sva_unbind_gpasid))
return -ENODEV;
return domain->ops->sva_unbind_gpasid(dev, pasid);
}
+EXPORT_SYMBOL_GPL(iommu_sva_unbind_gpasid);
+
+int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev,
+ void __user *udata)
+{
+ struct iommu_gpasid_bind_data data = { 0 };
+ int ret;
+
+ if (unlikely(!domain->ops->sva_bind_gpasid))
+ return -ENODEV;
+
+ ret = iommu_sva_prepare_bind_data(udata, &data);
+ if (ret)
+ return ret;
+
+ return iommu_sva_unbind_gpasid(domain, dev, data.hpasid);
+}
EXPORT_SYMBOL_GPL(iommu_uapi_sva_unbind_gpasid);
static void __iommu_detach_device(struct iommu_domain *domain,
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;
}
diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
index 5946779ac1f9..66d4ca40b40f 100644
--- a/include/uapi/linux/iommu.h
+++ b/include/uapi/linux/iommu.h
@@ -322,6 +322,7 @@ struct iommu_gpasid_bind_data {
#define IOMMU_GPASID_BIND_VERSION_1 1
__u32 version;
#define IOMMU_PASID_FORMAT_INTEL_VTD 1
+#define IOMMU_PASID_FORMAT_LAST 2
__u32 format;
__u32 addr_width;
#define IOMMU_SVA_GPASID_VAL (1 << 0) /* guest PASID valid */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.