user_memcpy()

Hi there,

François Revol made me recognize a design flaw in our user_memcpy()/
user_strlcpy() API: you have to check the validity of the user address 
yourself, ie. you have to make sure it's in user space.
But we don't have a function for this, just the (kernel private) macro 
IS_USER_ADDRESS().

And while I like to keep the macro, we should at least export an 
is_user_address() function.

But that would still open a possible source of errors - as you still 
have to check the address yourself. François suggested to do something 
similar than Linux that has copy_to_user() and copy_from_user() 
functions.
Since we also have a user_strlcpy() function, I would suggest the 
following:
	copy_to_user()
	copy_from_user()
	strlcpy_to_user()
	strlcpy_from_user()
	user_memset() - or memset_user()?

Any preferences?

Bye,
   Axel.



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