Vulnerability RUSTSEC-2023-0005
Summary
`tokio::io::ReadHalf<T>::unsplit` is Unsound
Details
tokio::io::ReadHalf<T>::unsplit can violate the Pin contract
The soundness issue is described in the tokio/issues#5372
Specific set of conditions needed to trigger an issue (a !Unpin type in ReadHalf) is unusual, combined with the difficulty of making any arbitrary use-after-free exploitable in Rust without doing a lot of careful alignment of data types in the surrounding code.
The tokio feature io-util is also required to be enabled to trigger this soundness issue.
Thanks to zachs18 reporting the issue to Tokio team responsibly and taiki-e and carllerche appropriately responding and fixing the soundness bug.
Tokio before 0.2.0 used futures 0.1 that did not have Pin, so it is not affected by this issue.
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