Fix for AMD DRM/AMDkfd MMIO mapping overflow with large pages

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Issue: On certain systems, when using large pages (>4K), the DRM/AMDkfd driver fails to correctly map MMIO HDP pages. - Cause: On some systems, there is an unused 4K region within the GPU's BAR space that can be mapped to MMIO space. However, when large pages are used, the system exposes the MMIO space's PAGE_SIZE. 2. Fixes Implemented: - Code Changes: Modifications were made in the file , specifically in the functions and . - Changes Made: - In the function, a conditional check was added to ensure the mapped address does not exceed PAGE_SIZE. - In the function, a conditional check was added to ensure the mapped address does not exceed PAGE_SIZE. 3. Scope of Fix: - Affected File: - Affected Code Lines: Lines 1278 to 1284, and lines 1872 to 1879. 4. Fix Status: - Status: The fix has been merged into upstream. - Author: Alex Deucher - Commit Date: April 14, 2024 - Committer: Greg Kroah-Hartman 5. Related Patch: - Patch ID: d8e408a82704 - Patch Description: Expose HDP registers to userspace 6. Review and Sign-off: - Reviewer: Felix Kuehling - Sign-off: Alex Deucher This information indicates that the vulnerability has been resolved and has undergone review and sign-off, ensuring the effectiveness and security of the fix.

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Fix for AMD DRM/AMDkfd MMIO mapping overflow with large pages