I have to verify buffer passed by user program is valid or not. I am using
access_ok, on i386 plateform. If I pass NULL, access_ok does not catch it.
How can I check for WRITE validity of buffer passed by the user.
copy_to_user is not a good choice for me, since I processing data is a loop,
which is under spinlock. So to use copy_to_user I have to modify logic.
Talib Alum
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