Fix for Missing Checked Flag Clearing in nilfs2

CVE-2024-50230

What is CVE-2024-50230?

A vulnerability in the nilfs2 file system within the Linux kernel has been identified concerning the handling of directory operations. When nilfs2 detects filesystem corruption, it can degrade to a read-only state. This situation may lead to a failure in preparing block writes, resulting in a triggered kernel bug due to an unchecked 'checked' flag associated with pages or folios. The failure to reset this flag, particularly when the nilfs2 discard routine affects files beyond just metadata, allows the sanity check of directory entries to be bypassed when the directory page or folio is reloaded. This oversight highlights the importance of proper page flag handling to maintain filesystem integrity.

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References