[$] Inheritable credentials for directory file descriptors
In Unix-like systems, an open file descriptor carries the right to access
the opened object in specific ways. As a general rule, that file
descriptor does not enable access to any other objects. The
recently merged BPF token feature runs
counter to this practice by creating file descriptors that carry specific
BPF-related access rights. A similar but different approach to
capability-carrying file descriptors, in the form of directory file
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