kallsyms_lookup_name

[Venkatram Tummala]

On Sun, Aug 7, 2011 at 4:03 PM, Abu Rasheda <rcpilot2010 at gmail.com> wrote:

>
>
> On Sat, Aug 6, 2011 at 11:06 AM, Mulyadi Santosa <
> mulyadi.santosa at gmail.com> wrote:
>
>> On Sat, Aug 6, 2011 at 12:55, Venkatram Tummala <venkatram867 at 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.
>

This is what i am currently doing but i need a cleaner way of doing this.

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

How do i do it using kprobes? To register a kprobe, i need the address of
kallsyms_lookup_name which is what i want in the first place.

Venkatram
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