linux-kernel - Re: [PATCH 13/13] perf, tool: Support for dwarf mode callchain on perf record

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Message-ID: <50193C83.6050503@gmail.com>
Date:	Wed, 01 Aug 2012 08:26:11 -0600
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	eranian@...gle.com, gorcunov@...nvz.org, tzanussi@...il.com,
	mhiramat@...hat.com, robert.richter@....com, fche@...hat.com,
	linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
	drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org
Subject: Re: [PATCH 13/13] perf, tool: Support for dwarf mode callchain on
 perf record

On 8/1/12 4:11 AM, Jiri Olsa wrote:
> +static int
> +parse_callchain_opt(const struct option *opt __used, const char *arg,
> +		    int unset)
> +{
> +	struct perf_record *rec = (struct perf_record *)opt->value;
> +	char *tok, *name, *saveptr = NULL;
> +	char buf[20];
> +	int ret = -1;
> +
> +	/* --no-call-graph */
> +	if (unset)
> +		return 0;
> +
> +	/* We specified default option if none is provided. */
> +	BUG_ON(!arg);
> +
> +	/* We need buffer that we know we can write to. */
> +	snprintf(buf, 20, "%s", arg);

Isn't arg the user supplied string? What if the user messes up and 
passes in 20+ characters to -g argument?

David
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