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CFI: (actually) check that methods are object-safe before projecting their receivers to dyn Trait in CFI #123066

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merged 1 commit into from
Mar 26, 2024

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@maurer maurer commented Mar 25, 2024

trait_object_ty assumed that associated types would be fully determined by the trait. This is almost true - const parameters and type parameters are no longer allowed, but lifetime parameters are. Since we erase all lifetime parameters anyways, instantiate it with as many erased regions as it needs.

Fixes: #123053

r? @compiler-errors

@rustbot rustbot added PG-exploit-mitigations Project group: Exploit mitigations S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Mar 25, 2024
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rustbot commented Mar 25, 2024

Some changes occurred in tests/ui/sanitizer

cc @rust-lang/project-exploit-mitigations, @rcvalle

Some changes occurred in compiler/rustc_symbol_mangling/src/typeid

cc @rust-lang/project-exploit-mitigations, @rcvalle

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`trait_object_ty` assumed that associated types would be fully
determined by the trait. This is *almost* true - const parameters and
type parameters are no longer allowed, but lifetime parameters are.
Since we erase all lifetime parameters anyways, instantiate it with as
many erased regions as it needs.

Fixes: rust-lang#123053
@maurer maurer force-pushed the cfi-erased-lifetime-ice branch from fb6c823 to 70e1d23 Compare March 25, 2024 22:46
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@bors r+

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bors commented Mar 25, 2024

📌 Commit 70e1d23 has been approved by compiler-errors

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 25, 2024
@compiler-errors compiler-errors changed the title CFI: Pad out associated type resolution with erased lifetimes CFI: (actually) check that methods are object-safe before projecting their receivers to dyn Trait in CFI Mar 25, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 26, 2024
…iaskrgr

Rollup of 10 pull requests

Successful merges:

 - rust-lang#122766 (store segment and module in `UnresolvedImportError`)
 - rust-lang#122996 (simplify_branches: add comment)
 - rust-lang#123047 (triagebot: Add notification of 2024 issues)
 - rust-lang#123066 (CFI: (actually) check that methods are object-safe before projecting their receivers to `dyn Trait` in CFI)
 - rust-lang#123067 (match lowering: consistently merge simple or-patterns)
 - rust-lang#123069 (Revert `cargo update` changes and bump `download-artifact` to v4)
 - rust-lang#123070 (Add my former address to .mailmap)
 - rust-lang#123086 (Fix doc link to BufWriter in std::fs::File documentation)
 - rust-lang#123090 (Remove `CacheSelector` trait now that we can use GATs)
 - rust-lang#123091 (Delegation: fix ICE on wrong `self` resolution)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 1fd3ee0 into rust-lang:master Mar 26, 2024
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@rustbot rustbot added this to the 1.79.0 milestone Mar 26, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Mar 26, 2024
Rollup merge of rust-lang#123066 - maurer:cfi-erased-lifetime-ice, r=compiler-errors

CFI: (actually) check that methods are object-safe before projecting their receivers to `dyn Trait` in CFI

`trait_object_ty` assumed that associated types would be fully determined by the trait. This is *almost* true - const parameters and type parameters are no longer allowed, but lifetime parameters are. Since we erase all lifetime parameters anyways, instantiate it with as many erased regions as it needs.

Fixes: rust-lang#123053

r? `@compiler-errors`
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ICE: CFI: typeid_for_instance: couldn't get fn_abi of instance Layout(ReferencesError(ErrorGuaranteed(())))
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