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Pin is unsound due to transitive effects of CoerceUnsized #68015

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Pin is unsound due to transitive effects of CoerceUnsized#68015
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C-bugCategory: This is a bug.E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleF-coerce_unsizedThe `CoerceUnsized` traitI-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessP-mediumMedium priorityT-langRelevant to the language team, which will review and decide on the PR/issue.requires-nightlyThis issue requires a nightly compiler in some way.
@nikomatsakis

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@nikomatsakis
nikomatsakis
opened on Jan 8, 2020

Split out from #66544. It is possible to exploit Pin on nightly Rust (but not stable) by creating smart pointers that implement CoerceUnsized but have strange behavior. See the dedicated internals thread for more details -- also, please keep conversation on the thread, and not on the Github issue. ❤️

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    C-bugCategory: This is a bug.E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleF-coerce_unsizedThe `CoerceUnsized` traitI-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessP-mediumMedium priorityT-langRelevant to the language team, which will review and decide on the PR/issue.requires-nightlyThis issue requires a nightly compiler in some way.

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