Question

Why is it not possible to directly call a kernel function from user mode?

a.

It would create a serious vulnerability

b.

It would increase system performance

c.

It would simplify the process of calling functions

d.

It would allow applications to take control of the system

Posted under Reverse Engineering

Answer: (a).It would create a serious vulnerability Explanation:It is not possible to directly call a kernel function from user mode because it would create a serious vulnerability. Applications could call into an invalid address within the kernel and crash the system, or even call into an address that would allow them to take control of the system.

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