failing copy_to_user()

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Hello,
 
In copy_to_user(), it fails in __verify_write(). It finds page as readonly.
The socket application program gives user buffer to receive data from socket receive buffer in kernel space? This user buffer has write access. But in verify_write() it is found to be readonly.Who makes page as readonly?
How can I avoid someone who makes page readonly?

--Dinesh


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