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Vulnerability CVE-2022-48894
Published: 2024-08-21
| Description: |
In the Linux kernel, the following vulnerability has been resolved:
iommu/arm-smmu-v3: Don't unregister on shutdown
Similar to SMMUv2, this driver calls iommu_device_unregister() from the
shutdown path, which removes the IOMMU groups with no coordination
whatsoever with their users - shutdown methods are optional in device
drivers. This can lead to NULL pointer dereferences in those drivers'
DMA API calls, or worse.
Instead of calling the full arm_smmu_device_remove() from
arm_smmu_device_shutdown(), let's pick only the relevant function call -
arm_smmu_device_disable() - more or less the reverse of
arm_smmu_device_reset() - and call just that from the shutdown path. |
References: |
https://git.kernel.org/stable/c/ead3e6c79479890444c777fd329afc125fecde48
https://git.kernel.org/stable/c/32ea2c57dc216b6ad8125fa680d31daa5d421c95
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