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

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Message-ID: <87d3b2040912110420w270cff7ew36a7f2389a88fdb9@mail.gmail.com>
Date:	Fri, 11 Dec 2009 13:20:04 +0100
From:	Frederic Riss <frederic.riss@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Wenji Huang <wenji.huang@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] ftrace: Fix MATCH_END_ONLY filter matching

2009/12/11 Li Zefan <lizf@...fujitsu.com>:
> 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.
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