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RUSTSEC-2021-0124

Data race when sending and receiving after closing a oneshot channel

Issued
Package
tokio (crates.io)
Type
Vulnerability
Categories
Keywords
#race-condition
Details
https://github.com/tokio-rs/tokio/issues/4225
Patched
  • >=1.8.4, <1.9.0
  • >=1.13.1
Unaffected
  • <0.1.14
Keywords
#race-condition
Affected Functions
Version
tokio::sync::oneshot::Receiver::close
  • <=1.13.0, >=0.1.14

Description

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.