stack

Handing stack overflows: linux kernel stack design highlights

* Every process has a dedicated kernel stack. In this context,
'process' includes user space processes and threads, plus those
processes that only exist inside the kernel (e.g. kswapd, xfslogd).

* When a process is sleeping, there is some state in its kernel stack
to let the scheduler wake it up, that stack does not change until the
scheduler assigns the task to a cpu. When a processing is running
and is scheduled on a cpu, it is actively reading and writing its
stack.

* Kernel stacks are a fixed size. Unlike user space stacks, they do

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