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iommufd: Add check on user response code

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The response code from user space is only allowed to be SUCCESS or
INVALID. All other values are treated by the device as a response code of
Response Failure according to PCI spec, section 10.4.2.1.  This response
disables the Page Request Interface for the Function.

Add a check in iommufd_fault_fops_write() to avoid invalid response
code.

Fixes: 07838f7fd5 ("iommufd: Add iommufd fault object")
Link: https://lore.kernel.org/r/20240710083341.44617-3-baolu.lu@linux.intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Lu Baolu 2024-07-10 16:33:40 +08:00 committed by Jason Gunthorpe
parent 861f96a785
commit d73cf5ff74
1 changed files with 10 additions and 0 deletions
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10
drivers/iommu/iommufd/fault.c
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@ -305,6 +305,16 @@ static ssize_t iommufd_fault_fops_write(struct file *filep, const char __user *b
if (rc)
break;
static_assert((int)IOMMUFD_PAGE_RESP_SUCCESS ==
(int)IOMMU_PAGE_RESP_SUCCESS);
static_assert((int)IOMMUFD_PAGE_RESP_INVALID ==
(int)IOMMU_PAGE_RESP_INVALID);
if (response.code != IOMMUFD_PAGE_RESP_SUCCESS &&
response.code != IOMMUFD_PAGE_RESP_INVALID) {
rc = -EINVAL;
break;
}
group = xa_erase(&fault->response, response.cookie);
if (!group) {
rc = -EINVAL;