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>
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];
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);