x86_64: interrupt stack overflows are not caught

[andrewboie]

x86_64 does not catch stack overflows that take place on the interrupt stack as expected by the CONFIG_HW_STACK_PROTECTION feature.

In detail, x86_64 uses separate interrupt stack buffers for each IRQ nesting level. None of them have guard pages configured. We need to have a guard page for every IRQ nesting level stack, or have nested IRQs take place all on the same stack with a guard region at the end (which is what most arches do).

We need a test case which proves that the scenario works, our current tests for stack overflows only test thread stacks, not interrupts or exceptions.

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[github-actions]

This issue has been marked as stale because it has been open (more than) 60 days with no activity. Remove the stale label or add a comment saying that you would like to have the label removed otherwise this issue will automatically be closed in 14 days. Note, that you can always re-open a closed issue at any time.