From the aspect of programe, how is done?
How can it avoid user mode programe to load kernel modules and call its functions?
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From the aspect of programe, how is done?
How can it avoid user mode programe to load kernel modules and call its functions?
Virtual memory.
Unprivileged processes simply can’t reach the kernel data structures and code, because there are no corresponding page table entries. And the CPU prevents unprivileged processes from swapping the page table.