Comment by titzer

We have a research project called WALI (WebAssembly Linux Interface) here: https://github.com/arjunr2/WALI

It's experimental, but there is a toolchain that can compile most C/Posix programs and run them on the prototype implemented in the WAMR engine. And yes, exec works! In fact, we are able to run bash and Lua and memcached, among other things.