linux-kernel - [PATCH v3 2/3] perf probe: Check group string length

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Message-Id: <20241012204725.928794-3-leo.yan@arm.com>
Date: Sat, 12 Oct 2024 21:47:24 +0100
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Leo Yan <leo.yan@....com>
Subject: [PATCH v3 2/3] perf probe: Check group string length

In the kernel, the probe group string length is limited up to
MAX_EVENT_NAME_LEN (including the NULL terminator).

Check for this limitation and report an error if it is exceeded.

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Leo Yan <leo.yan@....com>
---
 tools/perf/util/probe-event.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 061a0412dec2..224ec6818803 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2868,6 +2868,12 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
 	else
 		group = PERFPROBE_GROUP;
 
+	if (strlen(group) >= MAX_EVENT_NAME_LEN) {
+		pr_err("Probe group string='%s' is too long (>= %d bytes)\n",
+			group, MAX_EVENT_NAME_LEN);
+		return -ENOMEM;
+	}
+
 	/* Get an unused new event name */
 	ret = get_new_event_name(buf, sizeof(buf), event, namelist,
 				 tev->point.retprobe, allow_suffix);
-- 
2.25.1