This article gave a very indepth coverage of the keyboard processing in linux:
http://www.gadgetweb.de/programming/39-how-to-building-your-own-kernel-space-keylogger.html
Not sure about your architecture, but for my Lenovo laptop, when I do a "cat /dev/input/by-path/platform-i8042-serio-0-event-kbd" and redirect to a file, every single key input I entered is captured into the the file.
Therefore, looking into the kernel source, we can infer the files drivers/input/serio/i8042.c are responsible for the keyboard processing. Of course, this file is compiled into the kernel, not as a kernel module. So if u want to make any changes, instead of recompile the kernel and rebooting, one way to do dynamically is called "inline hooking" - look elsewhere for this method. It is explained in the following article:
but note the difference between the Phrack's interception and intercepting the API inside the i8042.c: when you do a "cat /dev/input/by-path/platform-i8042-serio-0-event-kbd" the keyboard entry is always captured - irregardless of whichever windows/terminal you are in. But the Phrack's method is cleaner - it is intercepting at the tty (eg drivers/tty/n_tty.c:receive_buf() inside the kernel source) level - so if you switch over to another window, the input got switch away - it is thus targetted to only that TTY.
And btw, USB keyboard's processing path is altogether different again....another
and perhaps u can read here many good writeups:
On Fri1, Dec 14, 2012 at 3:46 PM, manty kuma <mantykuma@xxxxxxxxx> wrote:
Hi,11
I have written a small module that toggles the capslock LED. To demonstrate it i want to replace the Existing keyboard module with mine. I tried lsmod|grep "key" without any success. also checked /proc/modules. I couldnot find any clue regarding the name of the module i need to uninstall. So, How can i remove the existing keyboard module and insert mine?
Regards,
Manty
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Regards,
Peter Teoh
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