linux-kernel - [for-next][PATCH 19/20] tracing/eprobe: Fix alloc event dir failed when event name no set

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Message-ID: <20220927160251.443413557@goodmis.org>
Date:   Tue, 27 Sep 2022 12:02:35 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Tom Zanussi <zanussi@...nel.org>,
        Linyu Yuan <quic_linyyuan@...cinc.com>, stable@...r.kernel.org,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Tao Chen <chentao.kernel@...ux.alibaba.com>
Subject: [for-next][PATCH 19/20] tracing/eprobe: Fix alloc event dir failed when event name no set

From: Tao Chen <chentao.kernel@...ux.alibaba.com>

The event dir will alloc failed when event name no set, using the
command:
"echo "e:esys/ syscalls/sys_enter_openat file=\$filename:string"
>> dynamic_events"
It seems that dir name="syscalls/sys_enter_openat" is not allowed
in debugfs. So just use the "sys_enter_openat" as the event name.

Link: https://lkml.kernel.org/r/1664028814-45923-1-git-send-email-chentao.kernel@linux.alibaba.com

Cc: Ingo Molnar <mingo@...hat.com>
Cc: Tom Zanussi <zanussi@...nel.org>
Cc: Linyu Yuan <quic_linyyuan@...cinc.com>
Cc: Tao Chen <chentao.kernel@...ux.alibaba.com
Cc: stable@...r.kernel.org
Fixes: 95c104c378dc ("tracing: Auto generate event name when creating a group of events")
Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Tao Chen <chentao.kernel@...ux.alibaba.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_eprobe.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index 78299d3724a2..c08bde9871ec 100644
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -1039,8 +1039,7 @@ static int __trace_eprobe_create(int argc, const char *argv[])
 	}
 
 	if (!event) {
-		strscpy(buf1, argv[1], MAX_EVENT_NAME_LEN);
-		sanitize_event_name(buf1);
+		strscpy(buf1, sys_event, MAX_EVENT_NAME_LEN);
 		event = buf1;
 	}
 
-- 
2.35.1