Extract slice metadata without references - #3629
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KnownLayout's slice implementation materialized a shared reference solely to read raw pointer metadata. That is invalid for null, dangling, unaligned, or otherwise non-dereferenceable slice pointers even though metadata extraction itself must accept them. Use the safe raw-slice pointer length API on Rust 1.79 and newer. On older supported compilers, capture a metadata candidate through raw-pointer hashing and authenticate it with raw slice pointer equality before returning it. Strengthen the implementer contract and cover null, dangling, deallocated, unaligned, derived-DST, and boundary-toolchain cases. Closes #3615 *Authored by an AI agent acting on Josh Liebow-Feeser's behalf.* gherrit-pr-id: Gro7m5vgpfdcy3pxtpl52hnbgworclnzw
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## Gkpenpjjuex55evmm52puxsa34xtjgc7t #3629 +/- ##
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+ Coverage 91.85% 91.89% +0.03%
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Lines 6093 6118 +25
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+ Hits 5597 5622 +25
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KnownLayout's slice implementation materialized a shared reference solely to
read raw pointer metadata. That is invalid for null, dangling, unaligned, or
otherwise non-dereferenceable slice pointers even though metadata extraction
itself must accept them.
Use the safe raw-slice pointer length API on Rust 1.79 and newer. On older
supported compilers, capture a metadata candidate through raw-pointer hashing
and authenticate it with raw slice pointer equality before returning it.
Strengthen the implementer contract and cover null, dangling, deallocated,
unaligned, derived-DST, and boundary-toolchain cases.
Closes #3615
Authored by an AI agent acting on Josh Liebow-Feeser's behalf.
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git fetch origin refs/heads/Gro7m5vgpfdcy3pxtpl52hnbgworclnzw && git checkout -b pr-Gro7m5vgpfdcy3pxtpl52hnbgworclnzw FETCH_HEADCheckout
git fetch origin refs/heads/Gro7m5vgpfdcy3pxtpl52hnbgworclnzw && git checkout FETCH_HEADCherry Pick
git fetch origin refs/heads/Gro7m5vgpfdcy3pxtpl52hnbgworclnzw && git cherry-pick FETCH_HEADPull
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