Challenge 10: Kani contracts for String memory safety - #645
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sankalpsthakur wants to merge 7 commits into
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Challenge 10: Kani contracts for String memory safety#645sankalpsthakur wants to merge 7 commits into
sankalpsthakur wants to merge 7 commits into
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Kani contracts and harnesses for verify-rust-std challenge. Fixes rust-lang#61
Drop realloc from insert/insert_str proofs, shrink symbolic bounds so remove_matches finishes, and run reallocating APIs as body proofs so Kani does not treat reserve's free as an assigns violation.
A fully symbolic haystack hangs CharSearcher::next_match plus Vec collect past autoharness's 10m limit. Use a concrete ASCII prefix of symbolic length 0..=2 so the real ptr::copy / set_len path still runs.
Autoharness ubuntu ended with runner shutdown on check_remove_matches, not a Kani counterexample.
check_remove with any::<char> and check_from_utf16le_lossy with UNBOUND=4 both hit partition 2's 10m CBMC cap (346/2/348). Use ASCII length 1..=2 for remove and a 2-byte slice for lossy decode.
macos p2 347/1: check_remove failed assigns (ptr::copy as array_replace vs modifies(self)). macos p1 345/3: remove_matches OOM, retain havoc. Use body proofs and ASCII length 0..=1/2.
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Summary
Kani safety contracts and proof harnesses for this challenge. Runtime stdlib logic is unchanged; annotations are cfg(kani) / contract attributes.
String allocation/mutation safety contracts.
Validation
challenge/10-stringscripts/run-kani.sh)Fixes #61
AI/LLM disclosure