On Sat, Aug 6, 2011 at 11:06 AM, Mulyadi Santosa <mulyadi.santosa@gmail.com> wrote:

On Sat, Aug 6, 2011 at 12:55, Venkatram Tummala <venkatram867@gmail.com> wrote:
> Hi,
>
> I need to use some unexported kernel symbols in my kernel module but in the
> particular kernel version i am based on (2.6.18 - RHEL 5.7),
> kallsyms_lookup_name is not exported and there is no kallsyms_on_each_symbol
> in this kernel. And I can't change the kernel owing to reasons i have no
> control over.
>
> In this scenario, how do i use unexported symbols. Is there any other
> mechanism by which i can lookup the address of a kernel symbol.

You can:

- grep kallsyms_lookup from /proc/kallsyms (it is there on SL 5.5 and SL 6.0. You can edit your program and assign something like:

int (*my_kallsyms_lookup_name)(const char *name) = (void *) KALLSYMS;

where KALLSYMS is address found above, or your loading script can feed this address.

if your kernel is compiled with kprobe, you can use it to get address too.