[PATCH bpf-next] selftests/bpf: fix spurious test failures in core_retro selftest

[Andrii Nakryiko <andriin@xxxxxx>]

core_retro selftest uses BPF program that's triggered on sys_enter
system-wide, but has no protection from some unrelated process doing syscall
while selftest is running. This leads to occasional test failures with
unexpected PIDs being returned. Fix that by filtering out all processes that
are not test_progs process.

Fixes: fcda189a5133 ("selftests/bpf: Add test relying only on CO-RE and no recent kernel features")
Signed-off-by: Andrii Nakryiko <andriin@xxxxxx>
---
 tools/testing/selftests/bpf/prog_tests/core_retro.c |  8 ++++++--
 tools/testing/selftests/bpf/progs/test_core_retro.c | 13 +++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/core_retro.c b/tools/testing/selftests/bpf/prog_tests/core_retro.c
index 78e30d3a23d5..6acb0e94d4d7 100644
--- a/tools/testing/selftests/bpf/prog_tests/core_retro.c
+++ b/tools/testing/selftests/bpf/prog_tests/core_retro.c
@@ -6,7 +6,7 @@
 
 void test_core_retro(void)
 {
-	int err, zero = 0, res, duration = 0;
+	int err, zero = 0, res, duration = 0, my_pid = getpid();
 	struct test_core_retro *skel;
 
 	/* load program */
@@ -14,6 +14,10 @@ void test_core_retro(void)
 	if (CHECK(!skel, "skel_load", "skeleton open/load failed\n"))
 		goto out_close;
 
+	err = bpf_map_update_elem(bpf_map__fd(skel->maps.exp_tgid_map), &zero, &my_pid, 0);
+	if (CHECK(err, "map_update", "failed to set expected PID: %d\n", errno))
+		goto out_close;
+
 	/* attach probe */
 	err = test_core_retro__attach(skel);
 	if (CHECK(err, "attach_kprobe", "err %d\n", err))
@@ -26,7 +30,7 @@ void test_core_retro(void)
 	if (CHECK(err, "map_lookup", "failed to lookup result: %d\n", errno))
 		goto out_close;
 
-	CHECK(res != getpid(), "pid_check", "got %d != exp %d\n", res, getpid());
+	CHECK(res != my_pid, "pid_check", "got %d != exp %d\n", res, my_pid);
 
 out_close:
 	test_core_retro__destroy(skel);
diff --git a/tools/testing/selftests/bpf/progs/test_core_retro.c b/tools/testing/selftests/bpf/progs/test_core_retro.c
index 75c60c3c29cf..20861ec2f674 100644
--- a/tools/testing/selftests/bpf/progs/test_core_retro.c
+++ b/tools/testing/selftests/bpf/progs/test_core_retro.c
@@ -8,6 +8,13 @@ struct task_struct {
 	int tgid;
 } __attribute__((preserve_access_index));
 
+struct {
+	__uint(type, BPF_MAP_TYPE_ARRAY);
+	__uint(max_entries, 1);
+	__type(key, int);
+	__type(value, int);
+} exp_tgid_map SEC(".maps");
+
 struct {
 	__uint(type, BPF_MAP_TYPE_ARRAY);
 	__uint(max_entries, 1);
@@ -21,6 +28,12 @@ int handle_sys_enter(void *ctx)
 	struct task_struct *task = (void *)bpf_get_current_task();
 	int tgid = BPF_CORE_READ(task, tgid);
 	int zero = 0;
+	int real_tgid = bpf_get_current_pid_tgid() >> 32;
+	int *exp_tgid = bpf_map_lookup_elem(&exp_tgid_map, &zero);
+
+	/* only pass through sys_enters from test process */
+	if (!exp_tgid || *exp_tgid != real_tgid)
+		return 0;
 
 	bpf_map_update_elem(&results, &zero, &tgid, 0);
 
-- 
2.24.1