[PATCH 5.4.y 2/2] tracing/kprobes: Fix symbol counting logic by looking at modules as well

[Sherry Yang]

From: Andrii Nakryiko <andrii@xxxxxxxxxx>

commit 926fe783c8a64b33997fec405cf1af3e61aed441 upstream.

Recent changes to count number of matching symbols when creating
a kprobe event failed to take into account kernel modules. As such, it
breaks kprobes on kernel module symbols, by assuming there is no match.

Fix this my calling module_kallsyms_on_each_symbol() in addition to
kallsyms_on_each_match_symbol() to perform a proper counting.

Link: https://lore.kernel.org/all/20231027233126.2073148-1-andrii@xxxxxxxxxx/

Cc: Francis Laniel <flaniel@xxxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Fixes: b022f0c7e404 ("tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols")
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Acked-by: Song Liu <song@xxxxxxxxxx>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Signed-off-by: Markus Boehme <markubo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[Sherry: It's a fix for previous backport, thus backport together to
5.4.y]
Signed-off-by: Sherry Yang <sherry.yang@xxxxxxxxxx>
---
 kernel/trace/trace_kprobe.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 80a59dbdd631..2164abe06d84 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -741,6 +741,8 @@ static unsigned int number_of_same_symbols(char *func_name)
 
 	kallsyms_on_each_symbol(count_symbols, &args);
 
+	module_kallsyms_on_each_symbol(count_symbols, &args);
+
 	return args.count;
 }
 
-- 
2.46.0