Kernel Extensions
Kernel extensions are modules or drivers that extend the functionality of an operating system kernel, allowing it to interact with hardware, add system services, or modify kernel behavior. They run in kernel space with high privileges, enabling low-level access to system resources like memory, CPU, and devices. Common examples include device drivers, file system drivers, and security modules.
Developers should learn about kernel extensions when building low-level system software, such as device drivers, virtualization tools, or security applications that require direct hardware access or kernel modifications. They are essential for operating system development, embedded systems, and performance-critical applications where user-space solutions are insufficient. However, due to security and stability risks, modern systems often restrict or replace them with safer alternatives like user-space drivers.