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CVE-2021-47140 Detail

Description

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.


Metrics

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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/d6177a6556f853785867e2ec6d5b7f4906f0d809
https://git.kernel.org/stable/c/d6177a6556f853785867e2ec6d5b7f4906f0d809
https://git.kernel.org/stable/c/f3f2cf46291a693eab21adb94171b0128c2a9ec1
https://git.kernel.org/stable/c/f3f2cf46291a693eab21adb94171b0128c2a9ec1

Weakness Enumeration

CWE-ID CWE Name Source

Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-47140
NVD Published Date:
03/25/2024
NVD Last Modified:
11/21/2024
Source:
kernel.org