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AJvYcCUJrvY+qVRzTskrE4E2aOcLyNwF4gYXKLsVKxQETGjTP2anGvzjNC3LtOfUKFV9yZ9uYYRDMgbE27pFTkA=@vger.kernel.org X-Gm-Message-State: AOJu0YwZUWZOu4FSWZ5ukNRHYNhXhl1npKpm3Y5p8TB3KGjema0PSAuY G1uzAfhJG40YGHzY/LOor5FotvjsgBzFeMjWOFye2pm5/df+mzT6KQumh7MZVlpi1AfadWRZ5Iz 95lVityKrGQ== X-Received: from dybtv22.prod.google.com ([2002:a05:7300:f496:b0:2d4:12b8:28ac]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:7495:b0:2c8:8ae4:962a with SMTP id 5a478bee46e88-2d5870ac142mr3557382eec.2.1775890701171; Fri, 10 Apr 2026 23:58:21 -0700 (PDT) Date: Fri, 10 Apr 2026 23:57:14 -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: <20260411065718.372240-26-irogers@google.com> Subject: [PATCH v8 25/29] perf sched: Bounds check CPU in sched switch events 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. Signed-off-by: Ian Rogers --- tools/perf/builtin-sched.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index 45439e2af8ff..6d0655d56e26 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -1791,6 +1791,11 @@ static int process_sched_switch_event(const struct perf_tool *tool, u32 prev_pid = perf_sample__intval(sample, "prev_pid"), next_pid = perf_sample__intval(sample, "next_pid"); + if (this_cpu < 0 || this_cpu >= MAX_CPUS) { + pr_debug("Out-of-bound sample CPU %d\n", this_cpu); + return -1; + } + if (sched->curr_pid[this_cpu] != (u32)-1) { /* * Are we trying to switch away a PID that is -- 2.53.0.1213.gd9a14994de-goog