kernel/linux.git/tools/perf/util/header.c, branch v7.1-rc5

perf header: Add sanity checks to HEADER_BPF_BTF processing

2026-04-14T06:21:53+00:00

Validate the BTF entry count and individual data sizes when reading HEADER_BPF_BTF from perf.data files to prevent excessive memory allocation from malformed files. Reuses the MAX_BPF_PROGS (131072) and MAX_BPF_DATA_LEN (256 MB) limits from HEADER_BPF_PROG_INFO processing. Cc: Song Liu Cc: Jiri Olsa Cc: Namhyung Kim Cc: Ian Rogers Cc: Adrian Hunter Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf header: Sanity check HEADER_BPF_PROG_INFO

2026-04-14T06:21:53+00:00

Add validation to process_bpf_prog_info() to harden against malformed perf.data files: - Upper bound on BPF program count (max 131072) - Upper bound on per-program data_len (max 256MB) Cc: Ian Rogers Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf header: Sanity check HEADER_PMU_CAPS

2026-04-14T06:21:53+00:00

Add upper bound checks in PMU capabilities processing to harden against malformed perf.data files: - nr_pmu bounded to MAX_PMU_MAPPINGS (4096) in process_pmu_caps() - nr_pmu_caps bounded to MAX_PMU_CAPS (512) in __process_pmu_caps() Cc: Ravi Bangoria Cc: Ian Rogers Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf header: Sanity check HEADER_HYBRID_TOPOLOGY

2026-04-14T06:21:53+00:00

Add upper bound check on nr_nodes in process_hybrid_topology() to harden against malformed perf.data files (reuses MAX_PMU_MAPPINGS, 4096). Cc: Ian Rogers Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf header: Sanity check HEADER_CACHE

2026-04-14T06:21:53+00:00

Add upper bound check on cache entry count in process_cache() to harden against malformed perf.data files (max 32768). Cc: Jiri Olsa Cc: Ian Rogers Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf header: Sanity check HEADER_GROUP_DESC

2026-04-14T06:21:53+00:00

Add upper bound check on nr_groups in process_group_desc() to harden against malformed perf.data files (max 32768), and move the env assignment after validation. Cc: Namhyung Kim Cc: Ian Rogers Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf header: Sanity check HEADER_PMU_MAPPINGS

2026-04-14T06:21:53+00:00

Add upper bound check on pmu_num in process_pmu_mappings() to harden against malformed perf.data files (max 4096). Cc: Ian Rogers Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf header: Sanity check HEADER_MEM_TOPOLOGY

2026-04-14T06:21:53+00:00

Add validation to process_mem_topology() to harden against malformed perf.data files: - Upper bound check on nr_nodes (reuses MAX_NUMA_NODES, 4096) - Minimum section size check before allocating This is particularly important here since nr is u64, making unbounded values especially dangerous. Cc: Jiri Olsa Cc: Ian Rogers Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf header: Sanity check HEADER_NUMA_TOPOLOGY

2026-04-14T06:21:53+00:00

Add validation to process_numa_topology() to harden against malformed perf.data files: - Upper bound check on nr_nodes (max 4096) - Minimum section size check before allocating Cc: Jiri Olsa Cc: Ian Rogers Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf header: Sanity check HEADER_CPU_TOPOLOGY

2026-04-14T06:21:53+00:00

Add validation to process_cpu_topology() to harden against malformed perf.data files: - Verify nr_cpus_avail was initialized (HEADER_NRCPUS processed first) - Bounds check sibling counts (cores, threads, dies) against nr_cpus_avail - Fix two bare 'return -1' that leaked env->cpu by using 'goto free_cpu' Cc: Jiri Olsa Cc: Ian Rogers Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim