linux-kernel - [PATCH] tracing/kprobes: Add missing check for skipping symbol counting logic

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Message-Id: <20240704164336.1176281-1-kniv@yandex-team.ru>
Date: Thu,  4 Jul 2024 19:43:36 +0300
From: Nikolay Kuratov <kniv@...dex-team.ru>
To: linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Cc: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Francis Laniel <flaniel@...ux.microsoft.com>,
	Nikolay Kuratov <kniv@...dex-team.ru>
Subject: [PATCH] tracing/kprobes: Add missing check for skipping symbol counting logic

In commit b022f0c7e404
("tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols")
it was already done for symbol in __trace_kprobe_create(), but func in
create_local_trace_kprobe() is also valid usage.
Not doing so leads to ENOENT for module_name:symbol_name
constructions passed over perf_event_open().

Fixes: b022f0c7e404 ("tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols")
Signed-off-by: Nikolay Kuratov <kniv@...dex-team.ru>
---
 kernel/trace/trace_kprobe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 16383247bdbf..3f4c9195dc0d 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1834,7 +1834,7 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
 	int ret;
 	char *event;
 
-	if (func) {
+	if (func && !strchr(func, ':')) {
 		unsigned int count;
 
 		count = number_of_same_symbols(func);
-- 
2.34.1