This situation is the sad and absurd result of two processes going on in the Rust community.

The first is that the Rust community on Reddit is in a feedback loop of groupthink and outrage, making it into a powerful vector for harassment. The maintainer of the actix project had a particularly terrible experience of escalating harassment from the users of this subreddit, and its extremely sad. This has caused a lot of grief for the maintainer of actix and prevented real (but far overblown) code issues from being fixed in a productive way.

But I think Steve undersells the absurdity of the unsafe anxiety. Some Rust commmunity members are conflating two wildly different scenarios together. The first is a library exposing an API which, if used in an unlikely and contrived way, could result in a program using that library containing undefined behavior. Then, since that program has undefined behavior, it could contain a memory bug. If that were the case, someone could potentially exploit that bug to attack a user of that program. You'll notice this is a series of conditional statements - its a funnel of decreasing probability.

So yes, library APIs which can allow UB in safe code - even unlikely and contrived safe code - must be fixed. The goal of Rust is that safe APIs can never cause UB. But people should have a proportionate understanding of the risk profile of these bugs (again: a programmer using this API in an unlikely way could create a program with a bug that could potentially be exploitable). This is a miniscule increase in the risk of another heartbleed, it is not the same thing as heartbleed.

The spark that lit the kindling of the toxic Reddit community was a blog post by Shnatsel, a member of the RustSec team. This blog post didn't get attention here, but I want to take a moment to look at how ridiculously it frames things by examining its analysis of a different project: reqwest (sort of the most standard HTTP client library in Rust).

Here's the link: https://medium.com/@shnatsel/smoke-testing-rust-http-clients...

The fuzz test, which is what the library is about, found no security issues. It found some hangs in 6% of cases and Shnatsel traces them to a known deadlock issue. This is a great result.

But Shnatsel spends most of this talking about a custom hashmap implemented in the http library, which the RustSec group did a security audit of just a few months ago. That security audit found only two issues, both UB that would result from a contrived use of a minor library API (they are linked in the blog post, but not explained). These two issues were fixed, and the fix released, by the maintainers of the http crate in 10 days.

This is an incredible success! The security audit of a foundational library found two minor issues which were promptly fixed, and the fuzz confirms that the entire stack on top of it seems to contain no memory issues. Wonderful result, but how does Shnatsel frame this?

> First things first: it didn’t segfault! I am actually impressed because I had really low expectations going into this.

Come on! The blog post is full of these kinds of snide zingers which are totally unfounded in the face of the actual evidence presented. When you have someone writing in this disingenuous, meanspirited way about open source maintainers and then putting this in front of a groupthinking rage machine community like Reddit, of course you're going to get harassment. This behavior is totally unacceptable, and it's very sad to see it promoted in the Rust community.