linux-kernel - Re: [PATCH 1/4] ftrace: Fix MATCH_END

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Message-ID: <4B258F0A.3030903@cn.fujitsu.com>
Date:	Mon, 14 Dec 2009 09:04:10 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Riss <frederic.riss@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Wenji Huang <wenji.huang@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] ftrace: Fix MATCH_END_ONLY filter matching

>>>>> For '*foo' pattern, we should allow any string ending with
>>>>> 'foo', but ftrace filter incorrectly disallows strings
>>>>> like bar_foo_foo:
>>>> [...]
>>>>>        case MATCH_END_ONLY:
>>>>> -               ptr = strstr(str, regex);
>>>>> -               if (ptr && (ptr[len] == 0))
>>>>> +               slen = strlen(str);
>>>>> +               if (slen >= len && memcpy(str + slen - len, regex, len))
>>>>>                        matched = 1;
>>>> Shouldn't that be memcmp() == 0? I don't see how memcpy might serve as
>>>> a compare operator.
>>>>
>>>> Fred.
>>>
>>> Oh you're right, I reviewed it too quickly. Perhaps the star's
>>> alignment made it possible for only one Frederic to review it
>>> the right way...
>>>
>> The stars are still fuzzy to me. How does memcpy work here?
> 
> 
> It doesn't, I guess Li intended to use memcmp.
> 

Oops, I forgot to fix this before sending the patch out.. :(

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