Native tasks do not have a guard page.

[alexcrichton]

We're about to get guard pages for green threads in #10460. We need to have guard pages for native tasks as well.

On windows, I don't believe that any extra action needs to be taken. All C code by default has stack checks, so it should all "Just Work".

On unix, it looks like we need to invoke pthread_attr_setguardsize in order to instruct the thread to be spawned with a guard page at the end.

[alexcrichton]

This would not protect against overflow on the main thread, but according to this semi-related bug: https://bugzilla.mozilla.org/show_bug.cgi?id=698528 it's pretty standard for there to be unmapped areas after the main thread's stack.

So sounds like the main task is taken care of and we just need to deal with spawned sub-tasks. It also appears that we by default have guard pages on all threads, but we should guarantee this by invoking the pthread call.

With this information, this is certainly not a high-priority issue, but it would be nice to guarantee.

[klutzy]

On unix: POSIX specification says default guard size is page size. (And at least on my amd64 linux returns pthread_attr_getguardsize returns 4096)

On windows: native thread has guard page support: see msdn article and Mark Russinovich's blog article.

[alexcrichton]

Ok, sounds like this should be closed as "already fixed". Yay!