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When you do that, the ABI boundary around your shared library is unsafe. So if you rebuilt userland with Rust and had the same layout of shared libraries then

When you do that, the ABI boundary around your shared library is unsafe. So if you rebuilt userland with Rust and had the same layout of shared libraries then you’d have a massive amount of unsafe code

woodruffw 1y ago
> So if you rebuilt userland with Rust and had the same layout of shared libraries then you’d have a massive amount of unsafe code Sort of, but I think that’s misleading; you’d have a massive amount of safe code, scaffolded with unsafe ABI boundaries. That’s a problem, but it’s not really the same kind of attacker or fault surface as unsafe code in the libraries themselves. It’s also a wholly solvable problem in the sense that Rust could define a stable non-C ABI. There just hasn’t been an extraordinary need for that yet, since most people who want to build Rust code into shared objects do want a C ABI.