Accessing user data from kernel

[Zhihui Zhang]

When the kernel wants to access any user data, it either copies them into
the kernel or maps them into kernel address space.  Can anyone tell me the
reasons why this is done?  When a process enters the kernel mode, the
page tables are not changed. 

I have taken this for granted for a long time without knowing the reasons.

Thanks,

-Zhihui



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