Challenge 13: Verify safety of CStr#566
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Samuelsills wants to merge 1 commit intomodel-checking:mainfrom
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Challenge 13: Verify safety of CStr#566Samuelsills wants to merge 1 commit intomodel-checking:mainfrom
Samuelsills wants to merge 1 commit intomodel-checking:mainfrom
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Verify all 14 items listed in the challenge specification. 14 Kani proof harnesses, 0 failures. Bounded verification with MAX_SIZE=32. Part 4 additions: check_index_range_from and check_clone_to_uninit. Resolves model-checking#150 By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.
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Summary
Verify all 14 items listed in Challenge 13. 14 Kani proof harnesses, 0 failures. Bounded verification with MAX_SIZE=32 as permitted by challenge assumptions.
Part 1: Invariant trait for CStr (pre-existing).
Part 2: Harnesses for all 9 safe methods (pre-existing).
Part 3: Contracts and harnesses for all 3 unsafe functions (pre-existing).
Part 4: New harnesses for trait implementations:
check_index_range_from: verifiesIndex<RangeFrom<usize>>preserves the CStr invariant when slicing from any valid start index.check_clone_to_uninit: verifiesCloneToUninitcopies correct bytes to the destination with no undefined behavior. Note: a formal#[requires]contract could not be added because the safety crate's proc macro does not currently support methods insideunsafe impl Traitblocks. Safety is verified via CBMC's built-in memory model checks.Resolves #150
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.