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New lint: unsound_collection_transmute #4592

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merged 1 commit into from
Oct 8, 2019
Merged

New lint: unsound_collection_transmute #4592

merged 1 commit into from
Oct 8, 2019

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llogiq
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@llogiq llogiq commented Sep 27, 2019

changelog: Add unsound_collection_transmute lint

This fixes #4515

@JohnTitor JohnTitor added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Sep 27, 2019
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llogiq commented Sep 28, 2019

@JohnTitor Thanks, I included your suggestions.

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llogiq commented Sep 28, 2019

Oops, it appears I needed another rebase.

@llogiq llogiq force-pushed the transmute-collection branch 2 times, most recently from 362d51c to 017fb60 Compare September 28, 2019 21:38
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llogiq commented Sep 30, 2019

r? @flip1995

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Impl LGTM. I think the fmttest should have triggered here, but maybe it didn't since some formatting errors are in the if_chain! macro. 🤔

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// used to check for UNSOUND_COLLECTION_TRANSMUTE
static COLLECTIONS: &[&[&str]] = &[
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Should we also include LinkedList here?

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@llogiq llogiq Oct 2, 2019 •
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I'm not sure. Transmuting might be admissible IF the alignment&size of the target type is lower or equal to that of the source type, the list isn't modified and either leaked or transmuted back to the original type afterwards. But this hasn't yet been specified by the unsafe WG, so I wouldn't bet on it. In any event, I'm erring on the side of least false positives here.

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llogiq commented Sep 30, 2019

r? @JohnTitor

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llogiq commented Oct 2, 2019

rebased.

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flip1995 commented Oct 3, 2019

Thanks!

@bors r+

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bors commented Oct 3, 2019

📌 Commit 27fa2b7 has been approved by flip1995

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bors commented Oct 3, 2019

⌛ Testing commit 27fa2b7 with merge 90e2155...

bors added a commit that referenced this pull request Oct 3, 2019
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Auto merge of #4592 - rust-lang:transmute-collection, r=flip1995
90e2155 
New lint: `unsound_collection_transmute`

changelog: Add `unsound_collection_transmute` lint

This fixes #4515
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bors commented Oct 3, 2019

💔 Test failed - status-appveyor

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llogiq commented Oct 3, 2019

It appears appveyor failed because it was missing rustfmt?

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flip1995 commented Oct 3, 2019

Not missing. But on windows rustfmt interpreted +nightly in rustfmt +nightly --check as a file name (also in cargo +nightly fmt --all --check)

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Auto merge of #4592 - rust-lang:transmute-collection, r=flip1995
e2393b0 
New lint: `unsound_collection_transmute`

changelog: Add `unsound_collection_transmute` lint

This fixes #4515
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bors commented Oct 8, 2019

⌛ Testing commit 27fa2b7 with merge e2393b0...

@phansch phansch mentioned this pull request Oct 8, 2019
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bors commented Oct 8, 2019

☀️ Test successful - checks-travis, status-appveyor
Approved by: flip1995
Pushing e2393b0 to master...

@bors bors merged commit 27fa2b7 into master Oct 8, 2019
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@flip1995 flip1995 deleted the transmute-collection branch October 28, 2019 08:13
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New lint: transmute of Vec<T> into Vec<U> with different size or alignment is UB
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