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rust: pin-init: add ?Sized bounds to traits in #[pin_data] macro

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The `#[pin_data]` macro uses some auxiliary traits to ensure that a user
does not implement `Drop` for the annotated struct, as that is unsound
and can lead to UB. However, if the struct that is annotated is
`!Sized`, the current bounds do not work, because `Sized` is an implicit
bound for generics.

This is *not* a soundness hole of pin-init, as it currently is
impossible to construct an unsized struct using pin-init.

Tested-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Benno Lossin <lossin@kernel.org>
This commit is contained in:
Benno Lossin
2026-01-16 11:54:23 +01:00
parent 560f6d13c3
commit dae5466c4a
1 changed files with 2 additions and 2 deletions
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4
rust/pin-init/internal/src/pin_data.rs
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@@ -215,7 +215,7 @@ fn drop(&mut self) {
// if it also implements `Drop`
trait MustNotImplDrop {}
#[expect(drop_bounds)]
impl<T: ::core::ops::Drop> MustNotImplDrop for T {}
impl<T: ::core::ops::Drop + ?::core::marker::Sized> MustNotImplDrop for T {}
impl #impl_generics MustNotImplDrop for #ident #ty_generics
#whr
{}
@@ -224,7 +224,7 @@ impl #impl_generics MustNotImplDrop for #ident #ty_generics
// `PinnedDrop` as the parameter to `#[pin_data]`.
#[expect(non_camel_case_types)]
trait UselessPinnedDropImpl_you_need_to_specify_PinnedDrop {}
impl<T: ::pin_init::PinnedDrop>
impl<T: ::pin_init::PinnedDrop + ?::core::marker::Sized>
UselessPinnedDropImpl_you_need_to_specify_PinnedDrop for T {}
impl #impl_generics
UselessPinnedDropImpl_you_need_to_specify_PinnedDrop for #ident #ty_generics