Hi, Are you modifying .strtab section to add your new symbol? If yes then make sure that strlen of the new symbol name and old symbol name is same.
Regards, Sandeep. On Tue, Aug 3, 2010 at 5:59 PM, Kamyar Mohajerani <kam...@gmail.com> wrote: > Hello everyone, > This is my first message to the KernelNewbies mailing list, so please > correct me if I'm not asking my question the right way. > What I actually want to do is to somehow intercept an internal kernel > function. The only way that seemed possible from my research was the > "classic" function injection technique (similar to the ones mentioned in the > old Phrack 59 and 61) by finding the function's address (e.g. through > /proc/kallsyms), overriding the first instructions with a jmp to my own > function (and optionally calling the original function by the same or other > tricks). This method works just fine for sys_* system call functions without > any problem. But when I try the same method for a function like printk , the > kernel crashes while my overridden function gets called. I'm sure my > overridden function is called as I can use the original prink in it. I have > lock and unlocked inside my function. I have also changed the function with > a one without any instructions in the body and still THE SAME thing > happens! > > [ so sorry for the double post, I accidentally hit the send, I guess I was > too excited for my first post! :-) ] >
