A Linux kernel module for setting up watchpoints without going through ptrace
This module aims to be a lightweight replacement to the ptrace module for setting and reporting values.
To compile watchpoints, hit make in the top directory.
Watchpoints is loaded as a normal kernel module as insmod ${path_to_watchpoints.ko}.
An watchpoint can only be set by the process owning the address space. To watch an address, send an ioctl to /dev/watchpoints, with code 1 and a pointer to a struct of form :
struct message {
long data_ptr,
long data_size
};
with pid, the pid of the running process, data_ptr, the pointer to the data to be watched and data_size, the size of the data to watch.
Any modificiation to the data can then be read in /dev/watchpoints. Be careful though, once read, the data in /dev/watchpoints is deleted.