GHSA-74r5-g7vc-j2v2: zerovec-derive incorrectly uses `#[repr(packed)]`

July 8, 2024 (updated July 9, 2024)

The affected versions make unsafe memory accesses under the assumption that #[repr(packed)] has a guaranteed field order.

The Rust specification does not guarantee this, and https://github.com/rust-lang/rust/pull/125360 (1.80.0-beta) starts reordering fields of #[repr(packed)] structs, leading to illegal memory accesses.

The patched versions 0.9.7 and 0.10.3 use #[repr(C, packed)], which guarantees field order.

References

github.com/advisories/GHSA-74r5-g7vc-j2v2
github.com/rustsec/advisory-db/pull/2007
github.com/unicode-org/icu4x/issues/5196
rustsec.org/advisories/RUSTSEC-2024-0346.html

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