Don't Overmap Identity VRAM Mapping to Avoid Hardware Bugs

CVE-2024-46718

What is CVE-2024-46718?

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

drm/xe: Don't overmap identity VRAM mapping

Overmapping the identity VRAM mapping is triggering hardware bugs on certain platforms. Use 2M pages for the last unaligned (to 1G) VRAM chunk.

v2:

• Always use 2M pages for last chunk (Fei Yang)
• break loop when 2M pages are used
• Add assert for usable_size being 2M aligned v3:
• Fix checkpatch

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References