rustsec-2021-0124
Vulnerability from osv_rustsec
Published
2021-11-16 12:00
Modified
2023-06-13 13:10
Summary
Data race when sending and receiving after closing a `oneshot` channel
Details

If a tokio::sync::oneshot channel is closed (via the [oneshot::Receiver::close] method), a data race may occur if the oneshot::Sender::send method is called while the corresponding oneshot::Receiver is awaited or calling try_recv.

When these methods are called concurrently on a closed channel, the two halves of the channel can concurrently access a shared memory location, resulting in a data race. This has been observed to cause memory corruption.

Note that the race only occurs when both halves of the channel are used after the Receiver half has called close. Code where close is not used, or where the Receiver is not awaited and try_recv is not called after calling close, is not affected.

See tokio#4225 for more details.

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{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption",
          "thread-safety"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "tokio::sync::oneshot::Receiver::close"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "tokio",
        "purl": "pkg:cargo/tokio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.14"
            },
            {
              "fixed": "1.8.4"
            },
            {
              "introduced": "1.9.0"
            },
            {
              "fixed": "1.13.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2021-45710",
    "GHSA-fg7r-2g4j-5cgr"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "If a `tokio::sync::oneshot` channel is closed (via the\n[`oneshot::Receiver::close`] method), a data race may occur if the\n`oneshot::Sender::send` method is called while the corresponding\n`oneshot::Receiver` is `await`ed or calling `try_recv`.\n\nWhen these methods are called concurrently on a closed channel, the two halves\nof the channel can concurrently access a shared memory location, resulting in a\ndata race. This has been observed to [cause memory corruption][corruption].\n\nNote that the race only occurs when **both** halves of the channel are used\nafter the `Receiver` half has called `close`. Code where `close` is not used, or where the\n`Receiver` is not `await`ed and `try_recv` is not called after calling `close`,\nis not affected.\n\nSee [tokio#4225][issue] for more details.\n\n[corruption]: https://github.com/tokio-rs/tokio/issues/4225#issuecomment-967434847\n[issue]: https://github.com/tokio-rs/tokio/issues/4225\n[`oneshot::Receiver::close`]: https://docs.rs/tokio/1.14.0/tokio/sync/oneshot/struct.Receiver.html#method.close",
  "id": "RUSTSEC-2021-0124",
  "modified": "2023-06-13T13:10:24Z",
  "published": "2021-11-16T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/tokio"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0124.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tokio-rs/tokio/issues/4225"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Data race when sending and receiving after closing a `oneshot` channel"
}


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