OSDev.org

in j.m tutorial say we must copy kernel heap and code to the child process:

http://www.jamesmolloy.co.uk/tutorial_h ... sking.html

why we need to copy kernel heap and code to the every child process in fork?

You don't want to copy it, but you do want to link it in the same place. I don't see anything in the tutorial about copying the kernel code/data.