[pypy-dev] W^X in the PyPy JIT?

Hi! Recently OpenBSD has started enforcing W^X [1] for all programs, unless the program is on a file system with a special 'wxallowed' flag. Regardless of the flag, a message is emitted to the dmesg buffer. Starting PyPy will emit such a message: pypy(62301): mmap W^X violation I suppose the memory the JIT is using for traces has been mapped W+X? Assuming this is the case, the security of PyPy (on all platforms) could be improved by mapping the memory W during trace compilation, and then re-mapping the memory X once compilation is complete. Of course, it might not be the JIT at all... Cheers [1] https://en.wikipedia.org/wiki/W%5EX -- Best Regards Edd Barrett http://www.theunixzoo.co.uk