tracing: fprobe-event: Sanitize wildcard for fprobe event name

Fprobe event accepts wildcards for the target functions, but unless user
specifies its event name, it makes an event with the wildcards.

  /sys/kernel/tracing # echo 'f mutex*' >> dynamic_events
  /sys/kernel/tracing # cat dynamic_events
  f:fprobes/mutex*__entry mutex*
  /sys/kernel/tracing # ls events/fprobes/
  enable         filter         mutex*__entry

To fix this, replace the wildcard ('*') with an underscore.

Link: https://lore.kernel.org/all/175535345114.282990.12294108192847938710.stgit@devnote2/

Fixes: 334e551 ("tracing/probes: Add fprobe events for tracing function entry and exit.")
Signed-off-by: Masami Hiramatsu (Google) <[email protected]>
Cc: [email protected]

Author: mhiramat

kernel/trace/trace.h

@@ -2204,7 +2204,7 @@ static inline bool is_good_system_name(const char *name)
 static inline void sanitize_event_name(char *name)
 {
 	while (*name++ != '\0')
-		if (*name == ':' || *name == '.')
+		if (*name == ':' || *name == '.' || *name == '*')
 			*name = '_';
 }