Not Rust, but it's very easy to wrap malloc under gcc for this kind of thing (or something more useful). Compile with --wrap=malloc and: void *__real_mallo

Not Rust, but it's very easy to wrap malloc under gcc for this kind of thing (or something more useful). Compile with --wrap=malloc and: void *__real_malloc(size_t); void *__wrap_malloc(size_t size) { ... return __real_malloc(size); }