Tracker / CVE-2024-47660
CVE-2024-47660
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.
Prodotti e versioni affette
| linux | linux_kernel · … → 5.10.226 |
|---|---|
| linux | linux_kernel · 5.11 → 5.15.167 |
| linux | linux_kernel · 5.16 → 6.1.109 |
| linux | linux_kernel · 6.2 → 6.6.50 |
| linux | linux_kernel · 6.7 → 6.10.9 |