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Prove trailing sizes, padding and capacity including overflow #3836

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6 changes: 5 additions & 1 deletion verification/aeneas/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -188,7 +188,7 @@ whole-program unsafe-code certification.

## Scope and proofs

Rust review entry points: [arithmetic assertions](../../zerocopy/src/util/checks.rs), [nested reference](../../zerocopy/src/layout/nested_reference.rs), [primitive assertions](../../zerocopy/src/layout/primitive_checks.rs).
Rust review entry points: [arithmetic assertions](../../zerocopy/src/util/checks.rs), [nested reference](../../zerocopy/src/layout/nested_reference.rs), [primitive assertions](../../zerocopy/src/layout/primitive_checks.rs), [tail assertions](../../zerocopy/src/layout/tail_checks.rs).

Extraction starts from the function and nominal-type owners of every present
`aeneas` fence in `zerocopy/src`, including their dependencies. Every present
Expand All @@ -204,6 +204,7 @@ added without extending the specification set.
| `DstLayout::{assume_shallow_unpadded,new_zst,for_type,for_unpadded_type,for_slice}` | Exact alignment, size-information fields, and recorded shallow-padding flags under explicit input premises. |
| `SizeInfo::try_to_nonzero_elem_size`, `max_elems_for_bytes` | Exact zero handling, preserved representation fields, and greatest fitting element count. |
| `DstLayout::requires_static_padding` | Exact negation of the recorded shallow-unpadded flag. |
| Trailing size, padding, and capacity | Exact size-offset and capacity formulas, checked-size overflow, and wrapping padding; successful sizes and physical padding refine the independent recursive semantics. |

Every registered function uses total `spec`: accepted raw representations,
supplied mathematical ghosts, and explicit requirements imply successful
Expand Down Expand Up @@ -232,6 +233,9 @@ the unpadded flag; realizability, alignment and fit conditions remain explicit.
Generic size/alignment reads are external data inputs, not correctness axioms.
See [SEMANTICS.md](SEMANTICS.md) for the Rust correspondence premise.

The checked trailing-size and padding contracts connect machine arithmetic
to the independent recursive semantics.

Plain arithmetic clauses use mathematical word values carrying machine bounds
and NonZero positivity. Their Nat/Int arithmetic does not wrap; explicit raw
clauses preserve the extracted representation vocabulary while retaining
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