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Rootkits can be classified into different categories according to how they enter a system. What's a kernel-level rootkit?
They attack operating systems that are installed in popcorn-making machines
They attack the level of an operating system that enables users to use specific programs that operate in them
They attack the level of an operating system that enables programs to use hardware components such as CPUs, memory, and input/output devices
They attack the level of an operating system that enables applications to use system calls
Computer operating systems provide different levels of access to resources. A protection ring is one of two or more hierarchical levels or layers of privilege within the architecture of a computer system. This is generally hardware-enforced by some CPU architectures that provide different CPU modes at the hardware or microcode level. Rings are arranged in a hierarchy from most privileged (most trusted, usually numbered zero) to least privileged (least trusted, usually with the highest ring number). On most operating systems, Ring 0 (Kernel) is the level with the most privileges and interacts most directly with the physical hardware such as the CPU and memory. https://en.wikipedia.org/wiki/Protection_ring
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