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Re: __kbrobes?


Hi Jun,

Jun Koi wrote:
> Hi,
> 
> I found some functions use __kprobes as directive (like text_poke()).
> Closer look points out that it is used to collect them into a section
> ".kprobes.text". What do we have to do with that? Is that because we
> dont want to probe those areas?

The __kprobes means that those functions are invoked from kprobe itself.
And kprobes doesn't accept to probe at the addresses in ".kprobes.text"
sectoin for preventing recursive-call of kprobes.

> 
> If so, why do we want to protect text_poke() against kprobes?

Indeed. text_poke() seems not to be invoked from kprobes probing
functions. It is used only for disarming/arming breakpoints from
registering/disabling kprobes.

Thank you,

> 
> Many thanks,
> Jun

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com


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