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C语言要消灭未定义行为

#ARTICLE HackerNews 2026.10.09
推荐指数 69.0 NO. 016 · 2026.10.09
发布2026/10/09Score120Comments137

MRI开源软件作者Martin Uecker在Kernel Recipes提出系统性削减C语言未定义行为的方案,目标让C逐步具备内存安全特性。对底层系统开发者而言,这可能是C语言数十年来最重要的演进方向,直接影响Linux内核、嵌入式等关键基础设施的安全模型。

C语言的安全化改造和Rust的崛起正在形成两条竞争路径。Rust靠所有权系统从零构建,而Uecker的路线是渐进式改良存量C代码——后者对Linux内核等庞大遗产代码库更具现实可行性。LWN长期跟踪内核社区动态,这个话题出现在Kernel Recipes而非学术会议,说明已经从研究设想进入工程讨论阶段。

对AI基础设施团队尤其值得注意:当前大模型推理框架(如llama.cpp、vLLM)重度依赖C/C++性能,若C获得原生内存安全保证,可能延缓甚至逆转部分场景向Rust迁移的趋势。做推理引擎优化的团队需要同时跟踪两条技术路线的成熟度,避免押注过早。

意见分歧 111 条评论

核心争论:消除UB需限制语言还是接受编译器优化代价,Rust能否成为C的安全替代

elais-dev

i've seen static analyzers catch many ub patterns, but guaranteeing zero ub needs whole‑program analysis that blows up compile time and still produces false positives that drown developers

eru

Yes, it's pretty much impossible to prove anything about arbitrary programs. However if you are willing to restrict what programs you allow, you can make guarantees possible. Silly example: if you compile valid (safe) Rust programs to C, you know that the resulting code will not invalidate Rust's bo

robotresearcher

> if you compile valid (safe) Rust programs to C, you know that the resulting code will not invalidate Rust's borrowing rules If you know the compiler is correct, which you don't.

替代方案: RustJavaJVM
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