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See more: os Kernel
Based on MSDN article
All code that runs in kernel mode shares a single virtual address space. This means that a kernel-mode driver is not isolated from other drivers and the operating system itself. If a kernel-mode driver accidentally writes to the wrong virtual address, data that belongs to the operating system or another driver could be compromised. If a kernel-mode driver crashes, the entire operating system crashes.
what is reason??
why OS don't Isolated Process in kernel-mode?
Posted 8-Dec-12 7:13am
Sir JeSon1.5K

1 solution

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Solution 1

Because Windows kernel (like, for instance, Linux one) is monolithic. There are alternatives, however, like Minix (see Microkernel at Wikipedia[^], "Does Windows have a Microkernel or Monolithic kernel?"[^]).
The latter page gives you also a reason: performance.
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Comments
Sergey Alexandrovich Kryukov at 9-Dec-12 0:06am
   
Good point, a 5. I would prefer to answer more correctly: "Because authors of the OS designed it this way".
Seriously, this is more correct. There is no one single reason. And this is not the law of natures, as illustrated by micro- nano-kernel approaches. People use a number of factors to take one or another route, including just personal preferences and capabilities.
--SA

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