linux-kernel - [PATCH 21/35] perf probe: Add warning message if there is unexpected event name

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Date:   Thu, 28 Dec 2017 11:30:13 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Paul Clarke <pc@...ibm.com>,
        bhargavb <bhargavaramudu@...il.com>,
        linux-rt-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 21/35] perf probe: Add warning message if there is unexpected event name

From: Masami Hiramatsu <mhiramat@...nel.org>

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.
   ======

Reported-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Acked-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Reviewed-by: Thomas Richter <tmricht@...ux.vnet.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Clarke <pc@...ibm.com>
Cc: bhargavb <bhargavaramudu@...il.com>
Cc: linux-rt-users@...r.kernel.org
Link: http://lkml.kernel.org/r/151275040665.24652.5188568529237584489.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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;
 }
 
-- 
2.13.6