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| author | Robin Murphy <robin.murphy@arm.com> | 2023-11-21 21:03:59 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-11-27 13:03:14 +0300 |
| commit | a9c362db39207c4934c9125e56ed730c5297c37c (patch) | |
| tree | 339b2bc3d6f19a410fd4595e74c413019f7c0cde /drivers/iommu/iommu.c | |
| parent | 1d8d43bb984b9cfa7ff63dbd0e2f6e5775ff1fdb (diff) | |
| download | linux-a9c362db39207c4934c9125e56ed730c5297c37c.tar.xz | |
iommu: Validate that devices match domains
Before we can allow drivers to coexist, we need to make sure that one
driver's domain ops can't misinterpret another driver's dev_iommu_priv
data. To that end, add a token to the domain so we can remember how it
was allocated - for now this may as well be the device ops, since they
still correlate 1:1 with drivers. We can trust ourselves for internal
default domain attachment, so add checks to cover all the public attach
interfaces.
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/097c6f30480e4efe12195d00ba0e84ea4837fb4c.1700589539.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/iommu.c')
| -rw-r--r-- | drivers/iommu/iommu.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 7fafd073c33e..8e4436c606d3 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2117,6 +2117,7 @@ static struct iommu_domain *__iommu_domain_alloc(const struct iommu_ops *ops, return NULL; domain->type = type; + domain->owner = ops; /* * If not already set, assume all sizes by default; the driver * may override this later @@ -2282,10 +2283,16 @@ struct iommu_domain *iommu_get_dma_domain(struct device *dev) static int __iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) { + struct device *dev; + if (group->domain && group->domain != group->default_domain && group->domain != group->blocking_domain) return -EBUSY; + dev = iommu_group_first_dev(group); + if (!dev_has_iommu(dev) || dev_iommu_ops(dev) != domain->owner) + return -EINVAL; + return __iommu_group_set_domain(group, domain); } @@ -3477,6 +3484,9 @@ int iommu_attach_device_pasid(struct iommu_domain *domain, if (!group) return -ENODEV; + if (!dev_has_iommu(dev) || dev_iommu_ops(dev) != domain->owner) + return -EINVAL; + mutex_lock(&group->mutex); curr = xa_cmpxchg(&group->pasid_array, pasid, NULL, domain, GFP_KERNEL); if (curr) { |