GHSA-48m6-wm5p-rr6h

Source

https://github.com/advisories/GHSA-48m6-wm5p-rr6h

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/11/GHSA-48m6-wm5p-rr6h/GHSA-48m6-wm5p-rr6h.json

Published

2023-11-14T18:32:20Z

Modified

2023-11-14T18:32:20Z

Details

All public versions prior to 1.02 used an insufficient check to ensure that users correctly marked the dependent type as either covariant or not_covariant. This allowed users to mark a dependent as covariant even though its type was not covariant but invariant, for certain invariant types involving trait object lifetimes. One example for such a dependent type is type Dependent<'a> = RefCell&lt;Box&lt;dyn fmt::Display + 'a>>. Such a type allowed unsound usage in purely safe user code that leads to undefined behavior. The patched versions now produce a compile time error if such a type is marked as covariant.

References

• https://github.com/Voultapher/self_cell/issues/49
• https://github.com/Voultapher/self_cell
• https://rustsec.org/advisories/RUSTSEC-2023-0070.html