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perf header: Sanity check HEADER_PMU_MAPPINGS

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Add upper bound check on pmu_num in process_pmu_mappings() to harden
against malformed perf.data files (max 4096).

Cc: Ian Rogers <irogers@google.com>
Assisted-by: Claude Code:claude-opus-4-6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Arnaldo Carvalho de Melo 2026-04-10 19:08:59 -03:00 committed by Namhyung Kim
parent a881fc5603
commit f613a6d694
1 changed files with 13 additions and 0 deletions
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13
tools/perf/util/header.c
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@ -64,6 +64,7 @@
#endif
#define MAX_NUMA_NODES 4096
#define MAX_PMU_MAPPINGS 4096
#define MAX_SCHED_DOMAINS 64
/*
@ -3069,6 +3070,18 @@ static int process_pmu_mappings(struct feat_fd *ff, void *data __maybe_unused)
return 0;
}
if (pmu_num > MAX_PMU_MAPPINGS) {
pr_err("Invalid HEADER_PMU_MAPPINGS: pmu_num (%u) > %u\n",
pmu_num, MAX_PMU_MAPPINGS);
return -1;
}
if (ff->size < sizeof(u32) + pmu_num * 2 * sizeof(u32)) {
pr_err("Invalid HEADER_PMU_MAPPINGS: section too small (%zu) for %u PMUs\n",
ff->size, pmu_num);
return -1;
}
env->nr_pmu_mappings = pmu_num;
if (strbuf_init(&sb, 128) < 0)
return -1;