Huh? That's not the Unix model. If I pass you a read-only file
descriptor, you're not supposed to be able to get write access to
the fd. If you can, that's a security hole. This is true whether
the fd refers to an inode still linked into the filesystem or not.
>The cases with potential security implications are all in the context of
>flink()ing to an open fd for an inode that still corresponds to at least
>one directory entry.
No, that's not correct.
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