CVE-2024-57897

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/amdkfd: Correct the migration DMA map direction

The SVM DMA device map direction should be set the same as

the DMA unmap setting, otherwise the DMA core will report

the following warning.

Before finialize this solution, there're some discussion on

the DMA mapping type(stream-based or coherent) in this KFD

migration case, followed by https://lore.kernel.org/all/04d4ab32

[email protected]/T/.

As there's no dma_sync_single_for_*() in the DMA buffer accessed

that because this migration operation should be sync properly and

automatically. Give that there's might not be a performance problem

in various cache sync policy of DMA sync. Therefore, in order to

simplify the DMA direction setting alignment, let's set the DMA map

direction as BIDIRECTIONAL.

[ 150.834218] WARNING: CPU: 8 PID: 1812 at kernel/dma/debug.c:1028 check_unmap+0x1cc/0x930

[ 150.834225] Modules linked in: amdgpu(OE) amdxcp drm_ex

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References