linux-kernel - Re: [RFC PATCH 01/22] perf: probe: avoid segfault if passed with ''.

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Date:	Wed, 06 May 2015 01:33:54 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Wang Nan <wangnan0@...wei.com>, ast@...mgrid.com,
	davem@...emloft.net, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	jolsa@...nel.org, lizefan@...nel.org, linux-kernel@...r.kernel.org,
	pi3orama@....com, hekuang@...wei.com
Subject: Re: [RFC PATCH 01/22] perf: probe: avoid segfault if passed with
 ''.

On 2015/05/06 0:26, Arnaldo Carvalho de Melo wrote:
> Em Tue, May 05, 2015 at 11:09:21PM +0900, Masami Hiramatsu escreveu:
>> On 2015/04/30 19:52, Wang Nan wrote:
>>> Since parse_perf_probe_point() deals with a user passed argument, we
>>> should not assume it to be a valid string.
>>>
>>> Without this patch, if pass '' to perf probe, a segfault raises:
>>>
>>>  $ perf probe -a ''
>>>  Segmentation fault
> 
>>> This patch checks argument of parse_perf_probe_point() before
>>> string processing.
> 
>>> After this patch:
> 
>>>  $ perf probe -a ''
>>>
>>>   usage: perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]
>>>      or: perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]
>>>      ...
>  
>> This looks OK to me.
>  
>> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
>  
>> Could you split this as an independent bugfix with my ack?
> 
> You mean split from this patchkit? I already did that, added it to my
> perf/urgent branch, where I'll add your acked-by as well,

Ah, you've done it! I missed it.

Thanks!

> 
> - Arnaldo
> 


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@...achi.com
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