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Show HN: Keysniffer – Linux kernel mode debugfs keylogger
- apjana 8y agokeysniffer is a Linux kernel module to grab keys pressed in the keyboard, or a keylogger. keysniffer is also an academic project for devs willing to learn Linux kernel module programming, with extensive comments, checkpatch.pl scanned code, standards-compliant Makefile and DKMS support. keysniffer was initially written for the US keyboard (and conforming laptops). By default it shows human-readable strings for the keys pressed. Optionally, the keycode shift_mask pair can be printed in hex or decimal. You can lookup the keycodes in /usr/include/linux/input-event-codes.h. The keypress logs are recorded in debugfs as long as the module is loaded. Only root or sudoers can read the log. The module name has been camouflaged to blend-in with other kernel modules. You can, however, execute a script at shutdown or reboot (the procedure would be distro-specific) to save the keys to a file. DISCLAIMER: keysniffer is intended to track your own devices and NOT to trespass on others. The author has never used it to compromise any third-party device and is not responsible for any unethical application.