微内核用户级驱动设计与实现

随着IT技术的不断发展，出现了越来越多的新设备，操作系统为了保持对这些新设备以及已有老设备的支持，其内核就要加入越来越多的驱动代码，驱动代码的加入使得原本已经复杂的内核更加庞大，且这些代码可能潜伏着许多漏洞，威胁系统安全。而微内核系统将设备驱动独立于用户空间，不再处于内核中，使得设备驱动不会影响到内核的安全，这种设计对于减少系统安全威胁帮助很大。

The Design and Implementation of User-level Device Driver in Micro-kernel OS

With the development of the technology ,there are more and more new devices .In order to support these new devices and the older devices ,a mount of driver codes have been added to the OS kernel .It makes the kernel more compli-cated .And the drivers may have some potential bugs ,which threat the security of the system .But in the micro-kernel OS ,the device drivers are isolated in the user-level address space .So the drivers can no longer affect the kernel’s securi-ty .It’s helpful to reduce the security threat of the system .