[PATCH] powerpc/kprobes: Fix null pointer reference in arch_prepare_kprobe()

[Naveen N. Rao]

Li Huafei wrote:
>>>
>>>   # echo 'p cmdline_proc_show' > kprobe_events
>>>   # echo 'p cmdline_proc_show+16' >> kprobe_events
>> 
>> I think we should extend multiple_kprobes selftest to also place
>> contiguous probes to catch such errors.
>> 
> Yes. But each architecture implementation is different and it looks a
> little difficult to decide which offsets need to be tested.

I don't think we need to be accurate here. A test to simply try putting 
a probe at every byte within the first 256 bytes of a kernel function 
should help catch many such issues. Some of those probes will be 
rejected, but we can ignore errors.


- Naveen