[bpf-next v1 2/2] bpf: properly test iter/task tid filtering

[Jordan Rome <linux@jordanrome.com>]

Previously test_task_tid was setting `linfo.task.tid`
to `getpid()` which is the same as `gettid()` for the
parent process. Instead create a new child thread
and set `linfo.task.tid` to `gettid()` to make sure
the tid filtering logic is working as expected.

Signed-off-by: Jordan Rome <linux@jordanrome.com>
---
 .../selftests/bpf/prog_tests/bpf_iter.c       | 26 +++++++++++++++----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
index 52e6f7570475..5b056eb5d166 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
@@ -226,7 +226,7 @@ static void test_task_common_nocheck(struct bpf_iter_attach_opts *opts,
 	ASSERT_OK(pthread_create(&thread_id, NULL, &do_nothing_wait, NULL),
 		  "pthread_create");

-	skel->bss->tid = getpid();
+	skel->bss->tid = gettid();

 	do_dummy_read_opts(skel->progs.dump_task, opts);

@@ -249,25 +249,41 @@ static void test_task_common(struct bpf_iter_attach_opts *opts, int num_unknown,
 	ASSERT_EQ(num_known_tid, num_known, "check_num_known_tid");
 }

-static void test_task_tid(void)
+static void *run_test_task_tid(void *arg)
 {
+	ASSERT_NEQ(getpid(), gettid(), "check_new_thread_id");
 	LIBBPF_OPTS(bpf_iter_attach_opts, opts);
 	union bpf_iter_link_info linfo;
 	int num_unknown_tid, num_known_tid;

 	memset(&linfo, 0, sizeof(linfo));
-	linfo.task.tid = getpid();
+	linfo.task.tid = gettid();
 	opts.link_info = &linfo;
 	opts.link_info_len = sizeof(linfo);
 	test_task_common(&opts, 0, 1);

 	linfo.task.tid = 0;
 	linfo.task.pid = getpid();
-	test_task_common(&opts, 1, 1);
+	// This includes the parent thread, this thread, and the do_nothing_wait thread
+	test_task_common(&opts, 2, 1);

 	test_task_common_nocheck(NULL, &num_unknown_tid, &num_known_tid);
-	ASSERT_GT(num_unknown_tid, 1, "check_num_unknown_tid");
+	ASSERT_GT(num_unknown_tid, 2, "check_num_unknown_tid");
 	ASSERT_EQ(num_known_tid, 1, "check_num_known_tid");
+
+	pthread_exit(arg);
+}
+
+static void test_task_tid(void)
+{
+	pthread_t thread_id;
+	void *ret;
+
+	// Create a new thread so pid and tid aren't the same
+	ASSERT_OK(pthread_create(&thread_id, NULL, &run_test_task_tid, NULL),
+		  "pthread_create");
+	ASSERT_FALSE(pthread_join(thread_id, &ret) || ret != NULL,
+		     "pthread_join");
 }

 static void test_task_pid(void)
--
2.43.5