Re: [PATCH -tip v8 02/26] kprobes/x86: Allow to handle reentered kprobe on singlestepping

[Masami Hiramatsu]

(2014/03/22 6:44), Steven Rostedt wrote:
> On Wed, 05 Mar 2014 20:58:57 +0900
> Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx> wrote:
> 
>> Since the NMI handlers(e.g. perf) can interrupt in the
>> single stepping (or preparing the single stepping, do_debug
>> etc.), we should consider a kprobe is hit in the NMI
>> handler. Even in that case, the kprobe is allowed to be
>> reentered as same as the kprobes hit in kprobe handlers
>> (KPROBE_HIT_ACTIVE or KPROBE_HIT_SSDONE).
>> The real issue will happen when a kprobe hit while another
>> reentered kprobe is processing (KPROBE_REENTER), because
>> we already consumed a saved-area for the previous kprobe.
>>
>> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
>> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
>> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> 
> Reviewed-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
> 

Thanks! :)


-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@xxxxxxxxxxx


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