Restrict MaybeUninit trait impls to fix soundness#308
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Previously, we implemented `FromZeroes` and `FromBytes` for
`MaybeUninit<T>` with no bound on `T`. This resulted in a soundness hole
in which `T` - and thus `MaybeUninit<T>` - could contain an
`UnsafeCell`, which is a violation of the contracts of `FromZeroes` and
`FromBytes`.
This is a breaking change, but it's very unlikely to be one that code is
currently relying on, especially given that the 0.7.x release train was
published very recently. Thus, in this commit, we publish 0.7.3, and we
will yank 0.7.{0,1,2} as soon as 0.7.3 is published.
Fixes #299
joshlf
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Previously, we implemented `FromZeroes` and `FromBytes` for `MaybeUninit<T>` with no bound on `T`. This resulted in a soundness hole in which `T` - and thus `MaybeUninit<T>` - could contain an `UnsafeCell`, which is a violation of the contracts of `FromZeroes` and `FromBytes`. This is a breaking change, but it's very unlikely to be one that code is currently relying on. In this commit, we publish 0.6.4, and we will yank all preceding 0.6.x versions as soon as 0.6.4 is published. This is a backport of #308
joshlf
added a commit
that referenced
this pull request
Sep 2, 2023
Previously, we implemented `FromZeroes` and `FromBytes` for `MaybeUninit<T>` with no bound on `T`. This resulted in a soundness hole in which `T` - and thus `MaybeUninit<T>` - could contain an `UnsafeCell`, which is a violation of the contracts of `FromZeroes` and `FromBytes`. This is a breaking change, but it's very unlikely to be one that code is currently relying on. In this commit, we publish 0.6.4, and we will yank all preceding 0.6.x versions as soon as 0.6.4 is published. This is a backport of #308
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Previously, we implemented
FromZeroesandFromBytesforMaybeUninit<T>with no bound onT. This resulted in a soundness hole in whichT- and thusMaybeUninit<T>- could contain anUnsafeCell, which is a violation of the contracts ofFromZeroesandFromBytes.This is a breaking change, but it's very unlikely to be one that code is currently relying on, especially given that the 0.7.x release train was published very recently. Thus, in this commit, we publish 0.7.3, and we will yank 0.7.{0,1,2} as soon as 0.7.3 is published.
Fixes #299