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How the Linux Kernel Prevents Arbitrary CPU Instructions
The x86 architecture uses privilege rings (0 for kernel, 3 for user) to restrict CPU instructions. User processes run in ring 3, unable to access hardware or other processes' memory directly. System calls (syscall) allow processes to request kernel services, which execute in ring 0 after permission checks.
Meridian48 take
A clear technical explainer on OS security fundamentals, though it focuses on x86 and doesn't cover modern mitigations like KPTI or ARM's privilege levels.
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Como o kernel impede que processos executem instruções arbitrárias de CPU? →
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kernel-securityx86-architecture