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

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commit ec879e1a0be8007aa232ffedcf6a6445dfc1a3d7 upstream.

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: 334e5519c3 ("tracing/probes: Add fprobe events for tracing function entry and exit.")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masami Hiramatsu (Google) 2025-08-16 23:10:51 +09:00 committed by Greg Kroah-Hartman
parent d5ab785183
commit daf7938a20
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace.h
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@ -2145,7 +2145,7 @@ 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 = '_';
}