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> It was brought up because this disclaimer was also present in the CVE-2025-0665 advisory[0], which is essentially a double-free but on file descriptor level

I don't see how Rust would have prevented calling close() two times with the same eventfd.

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The same way Rust prevents calling close() two times on a file.

The standard for rust is that close() gets called automatically when the file descriptor goes out of scope. I believe you could choose to do it manually but that's unusual coding.

There isn't actually any close() function in the std::fs::File: https://doc.rust-lang.org/std/fs/struct.File.html

And if there were one (`drop` kind-of is that function though), it will consume the file handle so you cannot call it again.

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