advisory-db/crates/threadalone/RUSTSEC-2024-0005.md

[advisory]
id = "RUSTSEC-2024-0005"
package = "threadalone"
date = "2024-01-07"
url = "https://github.com/cr0sh/threadalone/issues/1"
informational = "unsound"
aliases = ["GHSA-w59h-378f-2frm"]

[versions]
patched = [">= 0.2.1"]

Unsound sending of non-Send types across threads

Affected versions can run the Drop impl of a non-Send type on a different thread than it was created on.

The flaw occurs when a stderr write performed by the threadalone crate fails, for example because stderr is redirected to a location on a filesystem that is full, or because stderr is a pipe that has been closed by the reader.

Dropping a non-Send type on the wrong thread is unsound. If used with a type such as a pthread-based MutexGuard, the consequence is undefined behavior. If used with Rc, there would be a data race on the reference count, which is likewise undefined behavior.