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

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Date:	Fri, 11 Dec 2009 13:27:23 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Frederic Riss <frederic.riss@...il.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	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

On Fri, Dec 11, 2009 at 01:20:04PM +0100, Frederic Riss wrote:
> 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.


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...

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