linux-kernel - Re: [PATCH 42/53] perf record: Prevent reading invalid data in record__mmap

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Message-ID: <20160111150007.GD21083@redhat.com>
Date:	Mon, 11 Jan 2016 13:00:07 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	Wang Nan <wangnan0@...wei.com>, acme@...nel.org,
	linux-kernel@...r.kernel.org, pi3orama@....com, lizefan@...wei.com,
	netdev@...r.kernel.org, davem@...emloft.net,
	He Kuang <hekuang@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 42/53] perf record: Prevent reading invalid data in
 record__mmap_read

Em Mon, Jan 11, 2016 at 05:21:44PM +0300, Sergei Shtylyov escreveu:
> On 01/11/2016 04:48 PM, Wang Nan wrote:
> >  	size = head - old;
> >+	if (size > (unsigned long)(md->mask) + 1) {
> >+		WARN_ONCE(1, "WARNING: failed to keep up with mmap data. (warn only once)\n");
> 
>    WARNING is already printed by WARN*(), no?

No, at least not in tools/include/asm/bug.h, perhaps include/asm/bug.h
has this now and tools/ drifted? Checking now...

- Arnaldo