Code reviews of the signal-simple crate // Lib.rs

RUSTSEC-2020-0126 on 2020-11-15: SyncChannel<T> can move 'T: !Send' to other threads

Affected versions of this crate unconditionally implement Send/Sync for SyncChannel<T>. SyncChannel<T> doesn't provide access to &T but merely serves as a channel that consumes and returns owned T.

Users can create UB in safe Rust by sending T: !Send to other threads with SyncChannel::send/recv APIs. Using T = Arc<Cell<_> allows to create data races (which can lead to memory corruption), and using T = MutexGuard<T> allows to unlock a mutex from a thread that didn't lock the mutex.

CVE-2020-36446

GHSA-36cg-4jff-5863

GHSA-8892-84wf-cg8f

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