selftests/bpf: test_sockmap, join cgroup in selftest mode

In case of selftest mode, temporary cgroup environment is created but
cgroup is not joined. It causes test failures. Fixed by joining the
cgroup

Fixes: 16962b2404ac ("bpf: sockmap, add selftests")
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c
index 7b2008a144cb..7f9ca79aadbc 100644
--- a/tools/testing/selftests/bpf/test_sockmap.c
+++ b/tools/testing/selftests/bpf/test_sockmap.c
@@ -1344,6 +1344,11 @@ static int __test_suite(char *bpf_file)
                 return cg_fd;
         }
 
+        if (join_cgroup(CG_PATH)) {
+                fprintf(stderr, "ERROR: failed to join cgroup\n");
+                return -EINVAL;
+        }
+
         /* Tests basic commands and APIs with range of iov values */
         txmsg_start = txmsg_end = 0;
         err = test_txmsg(cg_fd);