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Make clone unsafe #1993

Merged
merged 2 commits into from
Aug 27, 2023
Merged

Make clone unsafe #1993

merged 2 commits into from
Aug 27, 2023

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djkoloski
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There are many features of clone that may cause memory unsafety when called. This documents one of them and references fork(), which is already unsafe to call.

Fixes #1975

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@asomers asomers left a comment

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Um yes, clone is nearly impossible to use safely. I see that the clone binding has been present in Nix since its very first commit in 2014, back before Rust 1.0. I'm guessing that almost no one has used it since then, which is why nobody has made it unsafe yet. There's only one problem with this PR: could you add a CHANGELOG entry?

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Sorry for the delay, should be good to go now.

@djkoloski djkoloski requested a review from asomers March 6, 2023 18:53
djkoloski and others added 2 commits August 27, 2023 15:08
There are many features of `clone` that may cause memory unsafety when
called. This documents one of them and references `fork()`, which is
already unsafe to call.
@asomers asomers force-pushed the unsafe_sched_clone branch from ddafa89 to eace807 Compare August 27, 2023 21:10
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asomers commented Aug 27, 2023

Sorry I missed this PR when last you updated it. I've just hijacked it to fix the merge conflict.

@asomers asomers added this pull request to the merge queue Aug 27, 2023
Merged via the queue into nix-rust:master with commit 56e1277 Aug 27, 2023
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sched::clone is unsound and should be unsafe to call
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