Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Clear DMA ops when switching domain Since commit 08a27c1c3ecf ("iommu: Add support to change default domain of an iommu group") a user can switch a device between IOMMU and direct DMA through sysfs. This doesn't work for AMD IOMMU at the moment because dev->dma_ops is not cleared when switching from a DMA to an identity IOMMU domain. The DMA layer thus attempts to use the dma-iommu ops on an identity domain, causing an oops: # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/unbind # echo identity > /sys/bus/pci/devices/0000:00:05.0/iommu_group/type # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/bind ... BUG: kernel NULL pointer dereference, address: 0000000000000028 ... Call Trace: iommu_dma_alloc e1000e_setup_tx_resources e1000e_open Since iommu_change_dev_def_domain() calls probe_finalize() again, clear the dma_ops there like Vt-d does.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 08a27c1c3ecf5e1da193ce5f8fc97c3be16e75f0 before f3f2cf46291a693eab21adb94171b0128c2a9ec1; affected 08a27c1c3ecf5e1da193ce5f8fc97c3be16e75f0 before d6177a6556f853785867e2ec6d5b7f4906f0d809 |
| Linux / Linux | affected 5.11; unaffected 0 before 5.11; unaffected 5.12.9 through 5.12.*; unaffected 5.13 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/f3f2cf46291a693eab21adb94171b0128c2a9ec1
- https://git.kernel.org/stable/c/d6177a6556f853785867e2ec6d5b7f4906f0d809
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.