Re: Can eBPF programs call kfuncs of out-of-tree modules?

[Yonghong Song <yonghong.song@xxxxxxxxx>]

On 8/15/23 3:01 AM, Shuyi Cheng wrote:
> Hello.
>
> Recently we found that eBPF can call kernel functions, but we don’t know 
> whether it is possible to call register_btf_kfunc_id_set in the 
> out-of-tree module, and enable eBPF programs of types such as kprobe and 
> tracepoint to call functions defined in out-of-tree modules.

Never tried but I think it is possible. register_btf_kfunc_id_set()
can be used in modules.

btf.c:EXPORT_SYMBOL_GPL(register_btf_kfunc_id_set);

> Thanks in advance!