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AJvYcCX/wyXn9Wx9MahgpsxVgP5tSqdP8TBzVIZWh3QYFomWQA4vBnCepENTDCZa39KIvvdBNhOKvmcwhTfgxUA=@vger.kernel.org X-Gm-Message-State: AOJu0YwEinnjJjpyCZfecUqpPkKet/ms2qGOWCI/zruY05r6QkYt7fA8 MKaMDllubvP7XfI/cG3XhTJqD9oiCtghXpb+EXxOD9xyDrNUUyTjikAS58u9EGOYSkox+9y7cLJ VDer6o6YZyw== X-Received: from dlbvg3.prod.google.com ([2002:a05:7022:7f03:b0:12c:195e:1f6b]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:6725:b0:128:d219:e169 with SMTP id a92af1059eb24-12c34ea5555mr3492770c88.10.1775890704562; Fri, 10 Apr 2026 23:58:24 -0700 (PDT) Date: Fri, 10 Apr 2026 23:57:15 -0700 In-Reply-To: <20260411065718.372240-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260408072601.210837-1-irogers@google.com> <20260411065718.372240-1-irogers@google.com> X-Mailer: git-send-email 2.53.0.1213.gd9a14994de-goog Message-ID: <20260411065718.372240-27-irogers@google.com> Subject: [PATCH v8 26/29] perf timechart: Bounds check CPU From: Ian Rogers To: namhyung@kernel.org Cc: irogers@google.com, acme@kernel.org, adrian.hunter@intel.com, ajones@ventanamicro.com, ak@linux.intel.com, alex@ghiti.fr, alexander.shishkin@linux.intel.com, anup@brainfault.org, aou@eecs.berkeley.edu, atrajeev@linux.ibm.com, blakejones@google.com, ctshao@google.com, dapeng1.mi@linux.intel.com, derek.foreman@collabora.com, dvyukov@google.com, howardchu95@gmail.com, hrishikesh123s@gmail.com, james.clark@linaro.org, jolsa@kernel.org, krzysztof.m.lopatowski@gmail.com, leo.yan@arm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux@treblig.org, mingo@redhat.com, nichen@iscas.ac.cn, palmer@dabbelt.com, peterz@infradead.org, pjw@kernel.org, ravi.bangoria@amd.com, swapnil.sapkal@amd.com, tanze@kylinos.cn, thomas.falcon@intel.com, tianyou.li@intel.com, yujie.liu@intel.com, zhouquan@iscas.ac.cn Content-Type: text/plain; charset="UTF-8" Ensure the CPU is within expected bounds to avoid out of bound memory accesses in arrays tracking CPU state. Signed-off-by: Ian Rogers --- tools/perf/builtin-timechart.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c index 64f69bd67c6b..0db2a9bd5b91 100644 --- a/tools/perf/builtin-timechart.c +++ b/tools/perf/builtin-timechart.c @@ -607,6 +607,10 @@ process_sample_cpu_idle(struct timechart *tchart __maybe_unused, u32 state = perf_sample__intval(sample, "state"); u32 cpu_id = perf_sample__intval(sample, "cpu_id"); + if (cpu_id >= MAX_CPUS) { + pr_debug("Out-of-bounds cpu_id %u\n", cpu_id); + return -1; + } if (state == (u32)PWR_EVENT_EXIT) c_state_end(tchart, cpu_id, sample->time); else @@ -622,6 +626,10 @@ process_sample_cpu_frequency(struct timechart *tchart, u32 state = perf_sample__intval(sample, "state"); u32 cpu_id = perf_sample__intval(sample, "cpu_id"); + if (cpu_id >= MAX_CPUS) { + pr_debug("Out-of-bounds cpu_id %u\n", cpu_id); + return -1; + } p_state_change(tchart, cpu_id, sample->time, state); return 0; } @@ -662,6 +670,10 @@ process_sample_power_start(struct timechart *tchart __maybe_unused, u64 cpu_id = perf_sample__intval(sample, "cpu_id"); u64 value = perf_sample__intval(sample, "value"); + if (cpu_id >= MAX_CPUS) { + pr_debug("Out-of-bounds cpu_id %llu\n", (unsigned long long)cpu_id); + return -1; + } c_state_start(cpu_id, sample->time, value); return 0; } @@ -683,6 +695,10 @@ process_sample_power_frequency(struct timechart *tchart, u64 cpu_id = perf_sample__intval(sample, "cpu_id"); u64 value = perf_sample__intval(sample, "value"); + if (cpu_id >= MAX_CPUS) { + pr_debug("Out-of-bounds cpu_id %llu\n", (unsigned long long)cpu_id); + return -1; + } p_state_change(tchart, cpu_id, sample->time, value); return 0; } -- 2.53.0.1213.gd9a14994de-goog