linux-kernel - [PATCH v2 5.4 5.15 6.6] tracing/kprobes: Skip symbol counting logic for module symbols in create_local_trace

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Message-Id: <20241216111923.2547104-1-kniv@yandex-team.ru>
Date: Mon, 16 Dec 2024 14:19:23 +0300
From: Nikolay Kuratov <kniv@...dex-team.ru>
To: stable@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Francis Laniel <flaniel@...ux.microsoft.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Nikolay Kuratov <kniv@...dex-team.ru>
Subject: [PATCH v2 5.4 5.15 6.6] tracing/kprobes: Skip symbol counting logic for module symbols in create_local_trace_kprobe()

commit b022f0c7e404 ("tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols")
avoids checking number_of_same_symbols() for module symbol in
__trace_kprobe_create(), but create_local_trace_kprobe() should avoid this
check too. Doing this check leads to ENOENT for module_name:symbol_name
constructions passed over perf_event_open.

No bug in newer kernels as it was fixed more generally by
commit 9d8616034f16 ("tracing/kprobes: Add symbol counting check when module loads")

Link: https://lore.kernel.org/linux-trace-kernel/20240705161030.b3ddb33a8167013b9b1da202@kernel.org
Fixes: b022f0c7e404 ("tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols")
Signed-off-by: Nikolay Kuratov <kniv@...dex-team.ru>
---
v1 -> v2:
 * Reword commit title and message
 * Send for stable instead of mainline

 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 12d997bb3e78..94cb09d44115 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1814,7 +1814,7 @@ 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