I think the answer to your question is not obvious. Here, it would have prevented the problem of Apple. 12 years ago while working on a military project on sun,

I think the answer to your question is not obvious. Here, it would have prevented the problem of Apple. 12 years ago while working on a military project on sun, I have encountered a similar vulnerability caused by a regression https://blog.erratasec.com/2007/02/trivial-remote-solaris-0day-disable.html#.XV0RbegzbmE https://blog.erratasec.com/2007/02/trivial-remote-solaris-0d... Adding this kind of non regression test is costly, but it protects against source code management mistakes.