Bug 2312106 (CVE-2024-46709)

Summary: CVE-2024-46709 kernel: drm/vmwgfx: Fix prime with external buffers
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2312160    
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Description OSIDB Bzimport 2024-09-13 07:21:04 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/vmwgfx: Fix prime with external buffers

Make sure that for external buffers mapping goes through the dma_buf
interface instead of trying to access pages directly.

External buffers might not provide direct access to readable/writable
pages so to make sure the bo's created from external dma_bufs can be
read dma_buf interface has to be used.

Fixes crashes in IGT's kms_prime with vgem. Regular desktop usage won't
trigger this due to the fact that virtual machines will not have
multiple GPUs but it enables better test coverage in IGT.
Comment 1 Michal Findra 2024-09-13 10:35:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091347-CVE-2024-46709-2465@gregkh/T