Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush dev-IOTLB only when PCIe device is accessible in scalable mode Commit 4fc82cd907ac ("iommu/vt-d: Don't issue ATS Invalidation request when device is disconnected") relies on pci_dev_is_disconnected() to skip ATS invalidation for safely-removed devices, but it does not cover link-down caused by faults, which can still hard-lock the system. For example, if a VM fails to connect to the PCIe device, "virsh destroy" is executed to release resources and isolate the fault, but a hard-lockup occurs while releasing the group fd. Call Trace: qi_submit_sync qi_flush_dev_iotlb intel_pasid_tear_down_entry device_block_translation blocking_domain_attach_dev __iommu_attach_device __iommu_device_set_domain __iommu_group_set_domain_internal iommu_detach_group vfio_iommu_type1_detach_group vfio_group_detach_container vfio_group_fops_release __fput Although pci_device_is_present() is slower than pci_dev_is_disconnected(), it still takes only ~70 µs on a ConnectX-5 (8 GT/s, x2) and becomes even faster as PCIe speed and width increase. Besides, devtlb_invalidation_with_pasid() is called only in the paths below, which are far less frequent than memory map/unmap. 1. mm-struct release 2. {attach,release}_dev 3. set/remove PASID 4. dirty-tracking setup The gain in system stability far outweighs the negligible cost of using pci_device_is_present() instead of pci_dev_is_disconnected() to decide when to skip ATS invalidation, especially under GDR high-load conditions.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f873b85ec762c5a6abe94a7ddb31df5d3ba07d85 before 581ce094d9eafb78ec4f9de77bd24b780c151236; affected d70f1c85113cd8c2aa8373f491ca5d1b22ec0554 before e2c78c69f8faf2885ea4ceee08c71ac738f401a0; affected 34a7b30f56d30114bf4d436e4dc793afe326fbcf before ead67d0378e90f419e385a43af29435242d80c12; affected 2b74b2a92e524d7c8dec8e02e95ecf18b667c062 before 01aed2f1d7cb8fdf4c60c5bb4727608cb82b401d; affected 4fc82cd907ac075648789cc3a00877778aa1838b before 9813306610d0d718c863aaa70928bf57d7570ec0; affected 4fc82cd907ac075648789cc3a00877778aa1838b before 9deaacc8dcaddb6ddc5b52e1e63b457450ec0f94; affected 4fc82cd907ac075648789cc3a00877778aa1838b before 0da6697e577023d8867c7beb2d16a22510e4eea9; affected 4fc82cd907ac075648789cc3a00877778aa1838b before 10e60d87813989e20eac1f3eda30b3bae461e7f9; affected c04f2780919f20e2cc4846764221f5e802555868; affected 025bc6b41e020aeb1e71f84ae3ffce945026de05; affected 5.10.214 before 5.10.252; affected 5.15.153 before 5.15.202; affected 6.1.83 before 6.1.165; affected 6.6.23 before 6.6.128; affected 6.7.11 before 6.8; affected 6.8.2 before 6.9 |
| Linux / Linux | affected 6.9; unaffected 0 before 6.9; unaffected 5.10.252 through 5.10.*; unaffected 5.15.202 through 5.15.*; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.16 through 6.18.*; unaffected 6.19.6 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/581ce094d9eafb78ec4f9de77bd24b780c151236
- https://git.kernel.org/stable/c/e2c78c69f8faf2885ea4ceee08c71ac738f401a0
- https://git.kernel.org/stable/c/ead67d0378e90f419e385a43af29435242d80c12
- https://git.kernel.org/stable/c/01aed2f1d7cb8fdf4c60c5bb4727608cb82b401d
- https://git.kernel.org/stable/c/9813306610d0d718c863aaa70928bf57d7570ec0
- https://git.kernel.org/stable/c/9deaacc8dcaddb6ddc5b52e1e63b457450ec0f94
- https://git.kernel.org/stable/c/0da6697e577023d8867c7beb2d16a22510e4eea9
- https://git.kernel.org/stable/c/10e60d87813989e20eac1f3eda30b3bae461e7f9