The operating system is the basic software that is close to the hardware. It is not only a solid foundation for the security of application software, but also a shield for hardware insecurity factors. Based on the security risks of the operating system and the technical characteristics of the embedded operating system, several methods such as information protection, space domain protection and time domain protection are proposed to enhance the security of the operating system, so as to improve the ability of the embedded system to resist security threats such as system defects or malicious attacks from the enemy. The above security protection technologies have been verified in embedded Linux and achieved satisfactory results.
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