linux-kernel - [PATCH 08/15] perf config: Validate config variable arguments before trying use them

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Message-Id: <1479173927-24613-9-git-send-email-acme@kernel.org>
Date:   Mon, 14 Nov 2016 22:38:40 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Taeung Song <treeze.taeung@...il.com>,
        Jiri Olsa <jolsa@...nel.org>, Nambong Ha <over3025@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>, Wookje Kwon <aweee0@...il.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 08/15] perf config: Validate config variable arguments before trying use them

From: Taeung Song <treeze.taeung@...il.com>

You can show the values for several config items as below:

    # perf config report.queue-size call-graph.record-mode

but it is necessary to more precisely check arguments, before passing
them to show_spec_config().  This validation function would be also used
when parsing config key-value pairs arguments in the near future.

Committer notes:

Testing it:

  $ perf config bla.
  The config variable does not contain a variable name: bla.
  $ perf config .bla
  The config variable does not contain a section name: .bla
  $ perf config bla.bla
  $

Signed-off-by: Taeung Song <treeze.taeung@...il.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Nambong Ha <over3025@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Wang Nan <wangnan0@...wei.com>
Cc: Wookje Kwon <aweee0@...il.com>
Link: http://lkml.kernel.org/r/1478241862-31230-4-git-send-email-treeze.taeung@gmail.com
[ Fix some spelling errors ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-config.c | 45 +++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 41 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index df3fa1c18e55..88a43fe4963c 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -82,6 +82,27 @@ static int show_config(struct perf_config_set *set)
 	return 0;
 }
 
+static int parse_config_arg(char *arg, char **var)
+{
+	const char *last_dot = strchr(arg, '.');
+
+	/*
+	 * Since "var" actually contains the section name and the real
+	 * config variable name separated by a dot, we have to know where the dot is.
+	 */
+	if (last_dot == NULL || last_dot == arg) {
+		pr_err("The config variable does not contain a section name: %s\n", arg);
+		return -1;
+	}
+	if (!last_dot[1]) {
+		pr_err("The config variable does not contain a variable name: %s\n", arg);
+		return -1;
+	}
+
+	*var = arg;
+	return 0;
+}
+
 int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	int i, ret = 0;
@@ -130,10 +151,26 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 		}
 		break;
 	default:
-		if (argc)
-			for (i = 0; argv[i]; i++)
-				ret = show_spec_config(set, argv[i]);
-		else
+		if (argc) {
+			for (i = 0; argv[i]; i++) {
+				char *var, *arg = strdup(argv[i]);
+
+				if (!arg) {
+					pr_err("%s: strdup failed\n", __func__);
+					ret = -1;
+					break;
+				}
+
+				if (parse_config_arg(arg, &var) < 0) {
+					free(arg);
+					ret = -1;
+					break;
+				}
+
+				ret = show_spec_config(set, var);
+				free(arg);
+			}
+		} else
 			usage_with_options(config_usage, config_options);
 	}
 
-- 
2.7.4