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Index: head/sys/kern/vfs_lookup.c
===================================================================
--- head/sys/kern/vfs_lookup.c
+++ head/sys/kern/vfs_lookup.c
@@ -215,7 +215,11 @@
/*
* For dotdot lookups in capability mode, only allow the component
* lookup to succeed if the resulting directory was already traversed
- * during the operation. Also fail dotdot lookups for non-local
+ * during the operation. This catches situations where already
+ * traversed directory is moved to different parent, and then we walk
+ * over it with dotdots.
+ *
+ * Also allow to force failure of dotdot lookups for non-local
* filesystems, where external agents might assist local lookups to
* escape the compartment.
*/

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