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    SubjectRe: null pointer questions
    Hi,

    Ken Ashcraft wrote:

    > Why does it matter if 0 is a valid user space or not? If I make the call
    >
    > copy_from_user(0, user_ptr, 4);
    >
    > the null pointer is the kernel address, not the user address. Can you
    > clarify please?

    Sorry, I misunderstood you. The kernel address has to be a valid address
    of course, otherwise the behavior is undefined.

    bye, Roman
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