Re: LKM function call on kernel function call?

[Daniel Bonekeeper <thehazard@gmail.com>]

You can also look about some methods of "function redirection
hooks"... add some opcodes at the start of the "hooked function"
(something like to add a CALL or JMP pointing to the address of your
function). There are docs about this subject, but unfortunately I
couldn't find anything now (http://www.ouah.org/p59-0x08.txt is not
exactly what I'm talking about, it's talking about ELF redirection).
It's a dirty thing to do, and it's not intended to be done in any
production thing (in fact, it's a *hack*).

On 7/5/05, S <talk2sumit@gmail.com> wrote:
> Is it possible to code a loadable module having function1(), which
> would be called, everytime a particular function of the kernel is
> called? If not, atleast a way this could be done without re-compiling
> the whole kernel and rebooting the system?
> 
> Example:
> 
> My LKM:
> -------------
> 
> init_module() {
> ...
> }
> 
> function1() {
> ...
> }
> 
> cleanup_module() {
> ...
> }
> 
> 
> I want function1() to be called, everytime the function
> ide_do_rw_disk() of ide-disk.c is called. I do not want to re-compile
> the complete kernel to do this.
> 
> Thanks in advance,
> 
> Regards,
> S
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-- 
# (perl -e "while (1) { print "\x90"; }") | dd of=/dev/evil