how to intercept system calls

于运超 wuyaalan at
Wed Jul 10 09:32:22 EDT 2013

     I wanna encrpto some data in kernel, and these encrypto data storage
on disk .i should decrypt data before system call trasmit to user mode.
then what should i do ? how to get encrypt data ?
     I wanna intercept write function(kernel), when this function got
encrypt data i will decrypt.
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