linux-kernel - Re: [PATCH] perf symbols: Fix reading build id

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Date:	Thu, 21 Jul 2016 09:21:55 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Uwe Kleine-König <uwe@...ine-koenig.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Jiri Olsa <jolsa@...nel.org>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf symbols: Fix reading build id

On 07/21/2016 09:09 AM, Uwe Kleine-König wrote:
> From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> 
> When is_regular_file(name) is called name points to a freshly allocated
> and uninitialized chunk of memory, so is_regular_file(name) is usually
> false and reading build id is skipped which makes it impossible to
> find debug infos when a build id based system is in use.
> 
> Fixes: 403567217d3f ("perf symbols: Do not read symbols/data from device files")
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

See https://patchwork.kernel.org/patch/9196777/

Marc

> ---
>  tools/perf/util/symbol.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 54c4ff2b1cee..7044742c828f 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1430,7 +1430,7 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
>  	 * Read the build id if possible. This is required for
>  	 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
>  	 */
> -	if (is_regular_file(name) &&
> +	if (is_regular_file(dso->long_name) &&
>  	    filename__read_build_id(dso->long_name, build_id, BUILD_ID_SIZE) > 0)
>  		dso__set_build_id(dso, build_id);
>  
> 


-- 
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