RUSTSEC-2020-0094

Unsound: can make ARefss contain a !Send, !Sync object.

Issued
Package
reffers (crates.io)
Type
Unsound
Categories
  • memory-corruption
  • thread-safety
Aliases
Details
https://github.com/diwic/reffers-rs/issues/7
CVSS
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Patched
  • >=0.6.1
Keywords
  • concurrency

Description

ARefss<'a, V> is a type that is assumed to contain objects that are Send + Sync.

In the affected versions of this crate, Send/Sync traits are unconditionally implemented for ARefss<'a, V>.

By using the ARefss::map() API, we can insert a !Send or !Sync object into ARefss<'a, V>. After that, it is possible to create a data race to the inner object of ARefss<'a, V>, which can lead to undefined behavior & memory corruption.

The flaw was corrected in commit 6dd7ca0 (https://github.com/diwic/reffers-rs/commit/6dd7ca0d50f2464df708975cdafcfaeeb6d41c66) by adding trait bound V: Send + Sync to ARefss::map() API.

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