linux-kernel - [PATCH v2 09/15] iommu/vt-d: Check ownership for PASIDs from user-space

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Message-Id: <1591877734-66527-10-git-send-email-yi.l.liu@intel.com>
Date:   Thu, 11 Jun 2020 05:15:28 -0700
From:   Liu Yi L <yi.l.liu@...el.com>
To:     alex.williamson@...hat.com, eric.auger@...hat.com,
        baolu.lu@...ux.intel.com, joro@...tes.org
Cc:     kevin.tian@...el.com, jacob.jun.pan@...ux.intel.com,
        ashok.raj@...el.com, yi.l.liu@...el.com, jun.j.tian@...el.com,
        yi.y.sun@...el.com, jean-philippe@...aro.org, peterx@...hat.com,
        hao.wu@...el.com, iommu@...ts.linux-foundation.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 09/15] iommu/vt-d: Check ownership for PASIDs from user-space

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@...el.com>
CC: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Eric Auger <eric.auger@...hat.com>
Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/intel-iommu.c | 10 ++++++++++
 drivers/iommu/intel-svm.c   |  6 ++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 2d59a5d..25650ac 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5433,6 +5433,7 @@ 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) {
@@ -5452,6 +5453,15 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev,
 			 (inv_info->addr_info.flags & IOMMU_INV_ADDR_FLAGS_PASID))
 			pasid = inv_info->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 bf55e2f..49059c1 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -332,7 +332,7 @@ 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;
@@ -450,6 +450,7 @@ int intel_svm_unbind_gpasid(struct iommu_domain *domain,
 			    struct iommu_gpasid_unbind_data *data)
 {
 	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;
@@ -464,9 +465,10 @@ int intel_svm_unbind_gpasid(struct iommu_domain *domain,
 		return -EINVAL;
 
 	pasid = data->pasid;
+	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