diff options
| author | Song Liu <song@kernel.org> | 2021-04-25 14:43:30 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-04-29 10:30:58 -0300 |
| commit | fe3dd8263b9f3912a0f3a2f66c0fdb3987d69a1a (patch) | |
| tree | eca85c8ff7ca4f6bcf9dc98cb8fff7d6f12ea9f3 | |
| parent | ec8149fba64b719a618b432ce9eea7ce937a523c (diff) | |
| download | linux-fe3dd8263b9f3912a0f3a2f66c0fdb3987d69a1a.tar.gz | |
perf bpf: check perf_attr_map is compatible with the perf binary
perf_attr_map could be shared among different version of perf binary. Add bperf_attr_map_compatible() to check whether the existing attr_map is compatible with current perf binary. Signed-off-by: Song Liu <song@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Song Liu <songliubraving@fb.com> Cc: kernel-team@fb.com Link: https://lore.kernel.org/r/20210425214333.1090950-3-song@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/util/bpf_counter.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c index be484ddbbd5b..5de991ab46af 100644 --- a/tools/perf/util/bpf_counter.c +++ b/tools/perf/util/bpf_counter.c @@ -312,6 +312,20 @@ static __u32 bpf_map_get_id(int fd) return map_info.id; } +static bool bperf_attr_map_compatible(int attr_map_fd) +{ + struct bpf_map_info map_info = {0}; + __u32 map_info_len = sizeof(map_info); + int err; + + err = bpf_obj_get_info_by_fd(attr_map_fd, &map_info, &map_info_len); + + if (err) + return false; + return (map_info.key_size == sizeof(struct perf_event_attr)) && + (map_info.value_size == sizeof(struct perf_event_attr_map_entry)); +} + static int bperf_lock_attr_map(struct target *target) { char path[PATH_MAX]; @@ -346,6 +360,11 @@ static int bperf_lock_attr_map(struct target *target) return -1; } + if (!bperf_attr_map_compatible(map_fd)) { + close(map_fd); + return -1; + + } err = flock(map_fd, LOCK_EX); if (err) { close(map_fd); |