The purpose of assignment is to check the authenticity of the user executing the system call, and prevent certain users from executing, kind of like certain security programs (although I don't exactly know how they work).
On Sat, Jul 8, 2017 at 8:50 PM, Greg KH <g...@kroah.com> wrote: > On Sat, Jul 08, 2017 at 07:53:31PM +0530, Ajinkya Surnis wrote: > > Actually, I've been given an assignment to write a kernel module such > that > > whenever a certain system call (e.g. open()) is executed, the control > should > > come to my new module; then it will do some processing on the parameters > and > > then call the actual syscall function (sys_open()). > > Horrible assignment, please pass along my regards to the professor that > this is not anything that should ever be assigned. Seriously, do you > want me to email them this? > > > I only found the way of intercepting 'sys_call_table'. I know this kind > of > > hacking is probably not a good idea. > > Can you suggest any alternative way? > > I would really appreciate. > > Don't do it. > > Really, this is not a valid thing to do in Linux. > > Feel free to quote me. > > Also, the assignment said nothing about 2 modules, so are you sure you > are even doing this right? :) > > thanks, > > greg k-h >
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