netdev - [PATCH 5.17 126/158] perf stat: Fix and validate CPU map inputs in synthetic PERF_RECORD

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Date:   Mon, 23 May 2022 19:04:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Dave Marchevsky <davemarchevsky@...com>,
        James Clark <james.clark@....com>,
        Jiri Olsa <jolsa@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        KP Singh <kpsingh@...nel.org>, Lv Ruyi <lv.ruyi@....com.cn>,
        Mark Rutland <mark.rutland@....com>,
        Martin KaFai Lau <kafai@...com>,
        Namhyung Kim <namhyung@...nel.org>, netdev@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Quentin Monnet <quentin@...valent.com>,
        Song Liu <songliubraving@...com>,
        Stephane Eranian <eranian@...gle.com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Yonghong Song <yhs@...com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 126/158] perf stat: Fix and validate CPU map inputs in synthetic PERF_RECORD_STAT events

From: Ian Rogers <irogers@...gle.com>

[ Upstream commit 92d579ea3279aa87392b862df5810f0a7e30fcc6 ]

Stat events can come from disk and so need a degree of validation. They
contain a CPU which needs looking up via CPU map to access a counter.

Add the CPU to index translation, alongside validity checking.

Discussion thread:

  https://lore.kernel.org/linux-perf-users/CAP-5=fWQR=sCuiSMktvUtcbOLidEpUJLCybVF6=BRvORcDOq+g@mail.gmail.com/

Fixes: 7ac0089d138f80dc ("perf evsel: Pass cpu not cpu map index to synthesize")
Reported-by: Michael Petlan <mpetlan@...hat.com>
Suggested-by: Michael Petlan <mpetlan@...hat.com>
Signed-off-by: Ian Rogers <irogers@...gle.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Dave Marchevsky <davemarchevsky@...com>
Cc: Ian Rogers <irogers@...gle.com>
Cc: James Clark <james.clark@....com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: John Fastabend <john.fastabend@...il.com>
Cc: Kan Liang <kan.liang@...ux.intel.com>
Cc: KP Singh <kpsingh@...nel.org>
Cc: Lv Ruyi <lv.ruyi@....com.cn>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Martin KaFai Lau <kafai@...com>
Cc: Michael Petlan <mpetlan@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: netdev@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Quentin Monnet <quentin@...valent.com>
Cc: Song Liu <songliubraving@...com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Xing Zhengjun <zhengjun.xing@...ux.intel.com>
Cc: Yonghong Song <yhs@...com>
Link: http://lore.kernel.org/lkml/20220519032005.1273691-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/util/stat.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index ee6f03481215..9c230b908b76 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -471,9 +471,10 @@ int perf_stat_process_counter(struct perf_stat_config *config,
 int perf_event__process_stat_event(struct perf_session *session,
 				   union perf_event *event)
 {
-	struct perf_counts_values count;
+	struct perf_counts_values count, *ptr;
 	struct perf_record_stat *st = &event->stat;
 	struct evsel *counter;
+	int cpu_map_idx;
 
 	count.val = st->val;
 	count.ena = st->ena;
@@ -484,8 +485,18 @@ int perf_event__process_stat_event(struct perf_session *session,
 		pr_err("Failed to resolve counter for stat event.\n");
 		return -EINVAL;
 	}
-
-	*perf_counts(counter->counts, st->cpu, st->thread) = count;
+	cpu_map_idx = perf_cpu_map__idx(evsel__cpus(counter), (struct perf_cpu){.cpu = st->cpu});
+	if (cpu_map_idx == -1) {
+		pr_err("Invalid CPU %d for event %s.\n", st->cpu, evsel__name(counter));
+		return -EINVAL;
+	}
+	ptr = perf_counts(counter->counts, cpu_map_idx, st->thread);
+	if (ptr == NULL) {
+		pr_err("Failed to find perf count for CPU %d thread %d on event %s.\n",
+			st->cpu, st->thread, evsel__name(counter));
+		return -EINVAL;
+	}
+	*ptr = count;
 	counter->supported = true;
 	return 0;
 }
-- 
2.35.1