Re: [PATCH v3 bpf-next 1/3] bpf: Add bpf_access_process_vm() helper

[Kenny Yu <kennyyu@xxxxxx>]

> > +BPF_CALL_5(bpf_access_process_vm, void *, dst, u32, size,
> > +          const void __user *, user_ptr, struct task_struct *, tsk,
> > +          u32, flags)
> > +{
> > +       /* flags is not used yet */
> > +       return access_process_vm(tsk, (unsigned long)user_ptr, dst, size, 0);
> > +}
>
> Though the 'flags' argument is unused the helper has to check
> that it's zero and return -EINVAL otherwise.
> If we don't do this we won't be able to change the behavior later
> due to backward compatibility.

Thanks for the feedback! Will fix.

Kenny