linux-kernel - [PATCH v3 1/5] perf-probe: Add warning message if there is unexpected event name

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Message-Id: <151275040665.24652.5188568529237584489.stgit@devbox>
Date:   Sat,  9 Dec 2017 01:26:46 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        bhargavb <bhargavaramudu@...il.com>,
        linux-kernel@...r.kernel.org, Paul Clarke <pc@...ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        Thomas Richter <tmricht@...ux.vnet.ibm.com>,
        linux-rt-users@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH v3 1/5] perf-probe: Add warning message if there is unexpected event name

This improve the error message so that user can know
event-name error before writing new events to
kprobe-events interface.

E.g.
   ======
   #./perf probe -x /lib64/libc-2.25.so malloc_get_state*
   Internal error: "malloc_get_state@...BC_2" is an invalid event name.
     Error: Failed to add events.
   ======

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Acked-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
---
 Changes in v3:
  - Update the error message.
---
 tools/perf/util/probe-event.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index b7aaf9b2294d..262d5da86623 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2625,6 +2625,14 @@ static int get_new_event_name(char *buf, size_t len, const char *base,
 
 out:
 	free(nbase);
+
+	/* Final validation */
+	if (ret >= 0 && !is_c_func_name(buf)) {
+		pr_warning("Internal error: \"%s\" is an invalid event name.\n",
+			   buf);
+		ret = -EINVAL;
+	}
+
 	return ret;
 }