> Faulted trying to access 0x10 - the offset in the string we were trying to read from :)

Is guaranteed that every offset you can try to read is guaranteed to create a segfault?

> Is guaranteed that every offset you can try to read is guaranteed to create a segfault?

The offset is fixed as part of the compiled code; the JVM can enforce that it's less than 4k (otherwise it can use an explicit NULL check), and that the first 4k page is always unmapped.