CVE-2024-47660
Description
In the Linux kernel, the following vulnerability has been resolved: fsnotify: clear PARENT_WATCHED flags lazily In some setups directories can have many (usually negative) dentries. Hence __fsnotify_update_child_dentry_flags() function can take a significant amount of time. Since the bulk of this function happens under inode->i_lock this causes a significant contention on the lock when we remove the watch from the directory as the __fsnotify_update_child_dentry_flags() call from fsnotify_recalc_mask() races with __fsnotify_update_child_dentry_flags() calls from __fsnotify_parent() happening on children. This can lead upto softlockup reports reported by users. Fix the problem by calling fsnotify_update_children_dentry_flags() to set PARENT_WATCHED flags only when parent starts watching children. When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in __fsnotify_parent() for each accessed child.
How to fix
- linux linux_kernel5.10.226, 5.15.167, 6.1.109, 6.6.50, 6.10.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 5.10.226, 5.11 ≤ v < 5.15.167, 5.16 ≤ v < 6.1.109, 6.2 ≤ v < 6.6.50, 6.7 ≤ v < 6.10.9 | 5.10.226, 5.15.167, 6.1.109, 6.6.50, 6.10.9 |
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