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libperf: Add perf_cpu_map__refcnt() interanl accessor to use in the maps test 

To remove one more direct access to 'struct perf_cpu_map' so that we can
intercept accesses to its instantiations and refcount check it to catch
use after free, etc.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Riccardo Mancini <rickyman7@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Link: https://lore.kernel.org/lkml/ZD1qdYjG+DL6KOfP@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2023-04-17 12:47:49 -03:00
parent 17354d1528
commit 4121234a32
3 changed files with 9 additions and 5 deletions
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6
tools/lib/perf/cpumap.c
View File

@ -40,7 +40,7 @@ struct perf_cpu_map *perf_cpu_map__dummy_new(void)
static void cpu_map__delete(struct perf_cpu_map *map)
{
if (map) {
WARN_ONCE(refcount_read(&map->refcnt) != 0,
WARN_ONCE(refcount_read(perf_cpu_map__refcnt(map)) != 0,
"cpu_map refcnt unbalanced\n");
free(map);
}
@ -49,13 +49,13 @@ static void cpu_map__delete(struct perf_cpu_map *map)
struct perf_cpu_map *perf_cpu_map__get(struct perf_cpu_map *map)
{
if (map)
refcount_inc(&map->refcnt);
refcount_inc(perf_cpu_map__refcnt(map));
return map;
}
void perf_cpu_map__put(struct perf_cpu_map *map)
{
if (map && refcount_dec_and_test(&map->refcnt))
if (map && refcount_dec_and_test(perf_cpu_map__refcnt(map)))
cpu_map__delete(map);
}

4
tools/lib/perf/include/internal/cpumap.h
View File

@ -30,4 +30,8 @@ bool perf_cpu_map__is_subset(const struct perf_cpu_map *a, const struct perf_cpu
void perf_cpu_map__set_nr(struct perf_cpu_map *map, int nr_cpus);
static inline refcount_t *perf_cpu_map__refcnt(struct perf_cpu_map *map)
{
return &map->refcnt;
}
#endif /* __LIBPERF_INTERNAL_CPUMAP_H */

4
tools/perf/tests/cpumap.c
View File

@ -68,7 +68,7 @@ static int process_event_cpus(struct perf_tool *tool __maybe_unused,
TEST_ASSERT_VAL("wrong nr", perf_cpu_map__nr(map) == 2);
TEST_ASSERT_VAL("wrong cpu", perf_cpu_map__cpu(map, 0).cpu == 1);
TEST_ASSERT_VAL("wrong cpu", perf_cpu_map__cpu(map, 1).cpu == 256);
TEST_ASSERT_VAL("wrong refcnt", refcount_read(&map->refcnt) == 1);
TEST_ASSERT_VAL("wrong refcnt", refcount_read(perf_cpu_map__refcnt(map)) == 1);
perf_cpu_map__put(map);
return 0;
}
@ -94,7 +94,7 @@ static int process_event_range_cpus(struct perf_tool *tool __maybe_unused,
TEST_ASSERT_VAL("wrong nr", perf_cpu_map__nr(map) == 256);
TEST_ASSERT_VAL("wrong cpu", perf_cpu_map__cpu(map, 0).cpu == 1);
TEST_ASSERT_VAL("wrong cpu", perf_cpu_map__max(map).cpu == 256);
TEST_ASSERT_VAL("wrong refcnt", refcount_read(&map->refcnt) == 1);
TEST_ASSERT_VAL("wrong refcnt", refcount_read(perf_cpu_map__refcnt(map)) == 1);
perf_cpu_map__put(map);
return 0;
}