how to intercept system calls

[于运超 <wuyaalan@xxxxxxxxx>]

Hi,

     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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