[PATCH v4 09/15] iommu/vt-d: Check ownership for PASIDs from user-space

From: Liu Yi L <yi.l.liu@intel.com>
To: alex.williamson@redhat.com, eric.auger@redhat.com,
	baolu.lu@linux.intel.com, joro@8bytes.org
Cc: kevin.tian@intel.com, jacob.jun.pan@linux.intel.com,
	ashok.raj@intel.com, yi.l.liu@intel.com, jun.j.tian@intel.com,
	yi.y.sun@intel.com, jean-philippe@linaro.org, peterx@redhat.com,
	hao.wu@intel.com, stefanha@gmail.com,
	iommu@lists.linux-foundation.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v4 09/15] iommu/vt-d: Check ownership for PASIDs from user-space
Date: Sat,  4 Jul 2020 04:26:23 -0700	[thread overview]
Message-ID: <1593861989-35920-10-git-send-email-yi.l.liu@intel.com> (raw)
In-Reply-To: <1593861989-35920-1-git-send-email-yi.l.liu@intel.com>

When an IOMMU domain with nesting attribute is used for guest SVA, a
system-wide PASID is allocated for binding with the device and the domain.
For security reason, we need to check the PASID passsed from user-space.
e.g. page table bind/unbind and PASID related cache invalidation.

Cc: Kevin Tian <kevin.tian@intel.com>
CC: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Eric Auger <eric.auger@redhat.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
 drivers/iommu/intel/iommu.c | 10 ++++++++++
 drivers/iommu/intel/svm.c   |  7 +++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 89d708d..7bebf82 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -5437,6 +5437,7 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev,
 		int granu = 0;
 		u64 pasid = 0;
 		u64 addr = 0;
+		void *pdata;
 
 		granu = to_vtd_granularity(cache_type, inv_info->granularity);
 		if (granu == -EINVAL) {
@@ -5456,6 +5457,15 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev,
 			 (inv_info->granu.addr_info.flags & IOMMU_INV_ADDR_FLAGS_PASID))
 			pasid = inv_info->granu.addr_info.pasid;
 
+		pdata = ioasid_find(dmar_domain->ioasid_sid, pasid, NULL);
+		if (!pdata) {
+			ret = -EINVAL;
+			goto out_unlock;
+		} else if (IS_ERR(pdata)) {
+			ret = PTR_ERR(pdata);
+			goto out_unlock;
+		}
+
 		switch (BIT(cache_type)) {
 		case IOMMU_CACHE_INV_TYPE_IOTLB:
 			/* HW will ignore LSB bits based on address mask */
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 1e567a1..aa2e1aa 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -323,7 +323,7 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
 	dmar_domain = to_dmar_domain(domain);
 
 	mutex_lock(&pasid_mutex);
-	svm = ioasid_find(INVALID_IOASID_SET, data->hpasid, NULL);
+	svm = ioasid_find(dmar_domain->ioasid_sid, data->hpasid, NULL);
 	if (IS_ERR(svm)) {
 		ret = PTR_ERR(svm);
 		goto out;
@@ -440,6 +440,7 @@ int intel_svm_unbind_gpasid(struct iommu_domain *domain,
 			    struct device *dev, ioasid_t pasid)
 {
 	struct intel_iommu *iommu = intel_svm_device_to_iommu(dev);
+	struct dmar_domain *dmar_domain;
 	struct intel_svm_dev *sdev;
 	struct intel_svm *svm;
 	int ret = -EINVAL;
@@ -447,8 +448,10 @@ int intel_svm_unbind_gpasid(struct iommu_domain *domain,
 	if (WARN_ON(!iommu))
 		return -EINVAL;
 
+	dmar_domain = to_dmar_domain(domain);
+
 	mutex_lock(&pasid_mutex);
-	svm = ioasid_find(INVALID_IOASID_SET, pasid, NULL);
+	svm = ioasid_find(dmar_domain->ioasid_sid, pasid, NULL);
 	if (!svm) {
 		ret = -EINVAL;
 		goto out;
-- 
2.7.4

