CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's XFS filesystem, specifically in the handling of data fork mappings during ILOCK cycles, which can lead to stale mappings and inaccurate values being returned. This flaw can result in improper direct I/O operations, potentially causing data corruption or loss. Organizations using Linux systems, particularly those relying on XFS for data-intensive applications, should prioritize patching this vulnerability to mitigate the risk of data integrity issues.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: xfs: resample the data fork mapping after cycling ILOCK xfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode, a data fork mapping, and a cow fork mapping. Unfortunately, these two helpers cycle the ILOCK to grab a transaction, which means that the mappings are stale as soon as we reacquire the ILOCK. Currently we refresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but we don't refresh the data fork mapping beforehand, which means that the xfs_bmap_trim_cow in that function queries the refcount btree about the wrong physical blocks and returns an inaccurate value in *shared. If *shared is now false, the directio write proceeds with a stale data fork mapping. Fix this by querying the data fork mapping if the sequence counter changes across the ILOCK cycle.
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