Linux Kernel secretmem: Fix arm64 direct map limitation in memfd_secret

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Vulnerability Name: - Description: On certain arm64 configurations, if the function returns , the system call will return . This occurs because some arm64 systems can only set direct mapping on 4k page sizes, and ARM's break-before-make semantics prevent direct mapping on large pages. 2. Mitigation Measures: - Fix Code: In , a conditional check was added: if , return . - Code Example: 3. Affected Scope: - Affected Systems: arm64 systems, particularly those where returns . - Fixed Systems: After the fix, systems will no longer return but instead return appropriate error codes based on actual conditions. 4. Fix Process: - Fix Date: October 1, 2024. - Fixer: Patrick Roy. - Reviewers: Mike Raponport, Alexander Graf, David Hildenbrand, James Gowans, Greg Kroah-Hartman. 5. Patch Links: - Original Patch: https://lore.kernel.org/lkml/20201124164938.GK8537@kernel.org/ - Follow-up Patch: https://lore.kernel.org/lkml/20210121122723.3446-11-rppt@kernel.org/ - Follow-up Patch: https://lore.kernel.org/lkml/20201125092288.12544-10-rppt@kernel.org/ 6. Related Links: - Original Issue: https://lkml.org/lkml/20201124164938.GK8537@kernel.org/ - Follow-up Issue: https://lkml.org/lkml/20210121122723.3446-11-rppt@kernel.org/ - Follow-up Issue: https://lkml.org/lkml/20201125092288.12544-10-rppt@kernel.org/ 7. Patch Status: - Status: Fixed. - Patch ID: . This information provides insight into the vulnerability's background, fix process, and affected scope, which is crucial for assessing system security and conducting security audits.

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Linux Kernel secretmem: Fix arm64 direct map limitation in memfd_secret