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

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Message-Id: <1663504148-40723-1-git-send-email-chentao.kernel@linux.alibaba.com>
Date:   Sun, 18 Sep 2022 20:29:08 +0800
From:   Tao Chen <chentao.kernel@...ux.alibaba.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tzvetomir Stoyanov <tz.stoyanov@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Tao Chen <chentao.kernel@...ux.alibaba.com>
Subject: [PATCH] tracing/eprobe: Fix alloc event dir failed when event name no set

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.

Fixes: 7491e2c44278 ("tracing: Add a probe that attaches to trace
events")
Signed-off-by: Tao Chen <chentao.kernel@...ux.alibaba.com>
---
 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 1783e3478912..a8938e54cd34 100644
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -968,8 +968,7 @@ 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;
 	}
 
-- 
2.32.0