thats enforced by the VM hardware - we just shuffle the PTEs around to match the...

rep_lodsb · 2026-01-06T09:00:22 1767690022

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".

convolvatron · 2026-01-06T14:06:26 1767708386

but those wouldn't be mapped unless you have crossed a call gate that enabled them. the kernel call gate implementation changes the VM map (region visibility) accordingly