F2FS Inline Data Flag Sanity Check During GC

CVE-2024-44942

What is CVE-2024-44942?

A vulnerability in the Linux kernel specifically affects the F2FS filesystem, particularly focusing on inline data handling. The issue arises during garbage collection (GC) processes when the F2FS_INLINE_DATA flag on inodes is not properly verified. This can result in the inline_data inode being improperly fuzzed, leading to valid block addresses residing within its direct node. When GC attempts to migrate a data block, it can trigger a kernel bug due to unexpected conditions, causing potential disruption. The resolution involves implementing a critical sanity check on the F2FS_INLINE_DATA flag during GC to prevent the migration of unvalidated data blocks, ensuring system stability and integrity.

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