thats enforced by the VM hardware - we just shuffle the PTEs around to match the appropriate segment view
As long as it's a linear address space, adding/subtracting a large enough value to a pointer (array, stack) could still cross into another "segment".
alt Hacker News
As long as it's a linear address space, adding/subtracting a large enough value to a pointer (array, stack) could still cross into another "segment".