linux-kernel - [PATCH v2 08/16] perf daemon: Dynamically allocate path to perf

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Date:   Fri, 26 May 2023 11:33:53 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        Ross Zwisler <zwisler@...omium.org>,
        Leo Yan <leo.yan@...aro.org>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Yang Jihong <yangjihong1@...wei.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH v2 08/16] perf daemon: Dynamically allocate path to perf

Avoid a PATH_MAX array in __daemon (the .data section) by dynamically
allocating the memory.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-daemon.c | 44 +++++++++++++++++++++++--------------
 1 file changed, 28 insertions(+), 16 deletions(-)

diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index 34cbe3e959aa..f5674d824a40 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -90,7 +90,7 @@ struct daemon {
 	char			*base;
 	struct list_head	 sessions;
 	FILE			*out;
-	char			 perf[PATH_MAX];
+	char			*perf;
 	int			 signal_fd;
 	time_t			 start;
 };
@@ -1490,6 +1490,14 @@ static int __cmd_ping(struct daemon *daemon, struct option parent_options[],
 	return send_cmd(daemon, &cmd);
 }
 
+static char *alloc_perf_exe_path(void)
+{
+	char path[PATH_MAX];
+
+	perf_exe(path, sizeof(path));
+	return strdup(path);
+}
+
 int cmd_daemon(int argc, const char **argv)
 {
 	struct option daemon_options[] = {
@@ -1502,8 +1510,12 @@ int cmd_daemon(int argc, const char **argv)
 			"field separator", "print counts with custom separator", ","),
 		OPT_END()
 	};
+	int ret = -1;
+
+	__daemon.perf = alloc_perf_exe_path();
+	if (!__daemon.perf)
+		return -ENOMEM;
 
-	perf_exe(__daemon.perf, sizeof(__daemon.perf));
 	__daemon.out = stdout;
 
 	argc = parse_options(argc, argv, daemon_options, daemon_usage,
@@ -1511,22 +1523,22 @@ int cmd_daemon(int argc, const char **argv)
 
 	if (argc) {
 		if (!strcmp(argv[0], "start"))
-			return __cmd_start(&__daemon, daemon_options, argc, argv);
+			ret = __cmd_start(&__daemon, daemon_options, argc, argv);
 		if (!strcmp(argv[0], "signal"))
-			return __cmd_signal(&__daemon, daemon_options, argc, argv);
+			ret = __cmd_signal(&__daemon, daemon_options, argc, argv);
 		else if (!strcmp(argv[0], "stop"))
-			return __cmd_stop(&__daemon, daemon_options, argc, argv);
+			ret = __cmd_stop(&__daemon, daemon_options, argc, argv);
 		else if (!strcmp(argv[0], "ping"))
-			return __cmd_ping(&__daemon, daemon_options, argc, argv);
-
-		pr_err("failed: unknown command '%s'\n", argv[0]);
-		return -1;
-	}
-
-	if (setup_config(&__daemon)) {
-		pr_err("failed: config not found\n");
-		return -1;
+			ret = __cmd_ping(&__daemon, daemon_options, argc, argv);
+		else
+			pr_err("failed: unknown command '%s'\n", argv[0]);
+	} else {
+		ret = setup_config(&__daemon);
+		if (ret)
+			pr_err("failed: config not found\n");
+		else
+			ret = send_cmd_list(&__daemon);
 	}
-
-	return send_cmd_list(&__daemon);
+	zfree(&__daemon.perf);
+	return ret;
 }
-- 
2.41.0.rc0.172.g3f132b7071-goog