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Fast memory vulnerabilities, written in 100% safe Rust (github.com)

submitted 9 months ago by testeronious@lemmy.world to c/programming@programming.dev

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[–] porgamrer@programming.dev 4 points 9 months ago (1 children)

Thanks for clarifying. Do you know what the bug is? I gathering it's something to do with enums and boxing to enable a "safe" transmute, but couldn't make sense of the code.

Scary compiler edge cases with value-type enums aren't surprising though. Trying to implement that feature with memory safety and high performance sounds like a nightmare.

[–] SorteKanin@feddit.dk 14 points 9 months ago

It's essentially this issue https://github.com/rust-lang/rust/issues/25860

The code used to exploit the bug in this library is here: https://github.com/Speykious/cve-rs/blob/main/src/lifetime_expansion.rs

As far as I understand, the bug basically makes it so you can trick Rust into thinking any lifetime is actually 'static. From that, you can do all kinds of bad stuff.