[v2,5.4,5.15,6.6] tracing/kprobes: Skip symbol counting logic for module symbols in create_local_trace_kprobe()

Commit Message

Nikolay Kuratov Dec. 16, 2024, 11:19 a.m. UTC

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/[e-mail]
Fixes: b022f0c7e404 ("tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols")
Signed-off-by: Nikolay Kuratov <[e-mail]>
---
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(-)

Patch

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);