diff options
| author | Ian Rogers <irogers@google.com> | 2023-09-06 03:39:12 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2023-09-11 16:26:35 +0300 |
| commit | a84fbf205609313594b86065c67e823f09ebe29b (patch) | |
| tree | 90f91db295730eaa8b2ae07087f763881cc4b739 /tools/perf/builtin-stat.c | |
| parent | 1bd69b4bf1dde99ac1ba2fdbcd5408d7f82c406a (diff) | |
| download | linux-a84fbf205609313594b86065c67e823f09ebe29b.tar.xz | |
perf stat: Fix aggr mode initialization
Generating metrics llc_code_read_mpi_demand_plus_prefetch,
llc_data_read_mpi_demand_plus_prefetch,
llc_miss_local_memory_bandwidth_read,
llc_miss_local_memory_bandwidth_write,
nllc_miss_remote_memory_bandwidth_read, memory_bandwidth_read,
memory_bandwidth_write, uncore_frequency, upi_data_transmit_bw,
C2_Pkg_Residency, C3_Core_Residency, C3_Pkg_Residency,
C6_Core_Residency, C6_Pkg_Residency, C7_Core_Residency,
C7_Pkg_Residency, UNCORE_FREQ and tma_info_system_socket_clks would
trigger an address sanitizer heap-buffer-overflows on a SkylakeX.
```
==2567752==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x5020003ed098 at pc 0x5621a816654e bp 0x7fffb55d4da0 sp 0x7fffb55d4d98
READ of size 4 at 0x5020003eee78 thread T0
#0 0x558265d6654d in aggr_cpu_id__is_empty tools/perf/util/cpumap.c:694:12
#1 0x558265c914da in perf_stat__get_aggr tools/perf/builtin-stat.c:1490:6
#2 0x558265c914da in perf_stat__get_global_cached tools/perf/builtin-stat.c:1530:9
#3 0x558265e53290 in should_skip_zero_counter tools/perf/util/stat-display.c:947:31
#4 0x558265e53290 in print_counter_aggrdata tools/perf/util/stat-display.c:985:18
#5 0x558265e51931 in print_counter tools/perf/util/stat-display.c:1110:3
#6 0x558265e51931 in evlist__print_counters tools/perf/util/stat-display.c:1571:5
#7 0x558265c8ec87 in print_counters tools/perf/builtin-stat.c:981:2
#8 0x558265c8cc71 in cmd_stat tools/perf/builtin-stat.c:2837:3
#9 0x558265bb9bd4 in run_builtin tools/perf/perf.c:323:11
#10 0x558265bb98eb in handle_internal_command tools/perf/perf.c:377:8
#11 0x558265bb9389 in run_argv tools/perf/perf.c:421:2
#12 0x558265bb9389 in main tools/perf/perf.c:537:3
```
The issue was the use of testing a cpumap with NULL rather than using
empty, as a map containing the dummy value isn't NULL and the -1
results in an empty aggr map being allocated which legitimately
overflows when any member is accessed.
Fixes: 8a96f454f5668572 ("perf stat: Avoid SEGV if core.cpus isn't set")
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230906003912.3317462-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-stat.c')
| -rw-r--r-- | tools/perf/builtin-stat.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 07b48f6df48e..a3af805a1d57 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -1622,7 +1622,7 @@ static int perf_stat_init_aggr_mode(void) * taking the highest cpu number to be the size of * the aggregation translate cpumap. */ - if (evsel_list->core.user_requested_cpus) + if (!perf_cpu_map__empty(evsel_list->core.user_requested_cpus)) nr = perf_cpu_map__max(evsel_list->core.user_requested_cpus).cpu; else nr = 0; |