Messages in this thread Patch in this message |  | | Date | Sat, 11 Apr 2026 19:08:29 -0700 | | Subject | [PATCH v10 26/29] perf timechart: Bounds check CPU | | From | Ian Rogers <> |
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Ensure the CPU is within expected bounds to avoid out of bound memory accesses in arrays tracking CPU state.
Signed-off-by: Ian Rogers <irogers@google.com> --- tools/perf/builtin-timechart.c | 35 +++++++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-)
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c index 64f69bd67c6b..64903b54e8a7 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; } @@ -635,6 +643,10 @@ process_sample_sched_wakeup(struct timechart *tchart, int waker = perf_sample__intval(sample, "common_pid"); int wakee = perf_sample__intval(sample, "pid"); + if (sample->cpu >= MAX_CPUS) { + pr_debug("Out-of-bounds cpu %u\n", sample->cpu); + return -1; + } sched_wakeup(tchart, sample->cpu, sample->time, waker, wakee, flags, backtrace); return 0; } @@ -648,6 +660,10 @@ process_sample_sched_switch(struct timechart *tchart, int next_pid = perf_sample__intval(sample, "next_pid"); u64 prev_state = perf_sample__intval(sample, "prev_state"); + if (sample->cpu >= MAX_CPUS) { + pr_debug("Out-of-bounds cpu %u\n", sample->cpu); + return -1; + } sched_switch(tchart, sample->cpu, sample->time, prev_pid, next_pid, prev_state, backtrace); return 0; @@ -662,6 +678,10 @@ 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; } @@ -671,6 +691,10 @@ process_sample_power_end(struct timechart *tchart, struct perf_sample *sample, const char *backtrace __maybe_unused) { + if (sample->cpu >= MAX_CPUS) { + pr_debug("Out-of-bounds cpu %u\n", sample->cpu); + return -1; + } c_state_end(tchart, sample->cpu, sample->time); return 0; } @@ -683,6 +707,10 @@ 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; } @@ -694,10 +722,9 @@ process_sample_power_frequency(struct timechart *tchart, */ static void end_sample_processing(struct timechart *tchart) { - u64 cpu; - struct power_event *pwr; + for (u64 cpu = 0; cpu < tchart->numcpus; cpu++) { + struct power_event *pwr; - for (cpu = 0; cpu <= tchart->numcpus; cpu++) { /* C state */ #if 0 pwr = zalloc(sizeof(*pwr)); @@ -1517,6 +1544,8 @@ static int process_header(struct perf_file_section *section __maybe_unused, switch (feat) { case HEADER_NRCPUS: tchart->numcpus = ph->env.nr_cpus_avail; + if (tchart->numcpus > MAX_CPUS) + tchart->numcpus = MAX_CPUS; break; case HEADER_CPU_TOPOLOGY: -- 2.53.0.1213.gd9a14994de-goog
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