From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Bonekeeper Subject: Re: LKM function call on kernel function call? Date: Thu, 14 Jul 2005 09:59:01 -0700 Message-ID: References: <1458d9610507050123124d6cb@mail.gmail.com> Reply-To: Daniel Bonekeeper Mime-Version: 1.0 Content-Transfer-Encoding: 7BIT Return-path: In-Reply-To: <1458d9610507050123124d6cb@mail.gmail.com> Content-Disposition: inline Sender: linux-c-programming-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii" To: S Cc: linux-kernel@vger.kernel.org, linux prg 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 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 > - > To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- # (perl -e "while (1) { print "\x90"; }") | dd of=/dev/evil