[PATCH] selftests/bpf: Add test for sleepable lsm_cgroup rejection

[David Windsor <dwindsor@gmail.com>]

Confirm the verifier rejects loading a sleepable BPF_LSM_CGROUP program,
as introduced in commit 5b038319be44 ("bpf: Reject sleepable
BPF_LSM_CGROUP programs at load time").

Signed-off-by: David Windsor <dwindsor@gmail.com>
---
 tools/testing/selftests/bpf/progs/verifier_lsm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/verifier_lsm.c b/tools/testing/selftests/bpf/progs/verifier_lsm.c
index 38e8e9176862..2f8103bfa14e 100644
--- a/tools/testing/selftests/bpf/progs/verifier_lsm.c
+++ b/tools/testing/selftests/bpf/progs/verifier_lsm.c
@@ -188,4 +188,13 @@ int BPF_PROG(null_check, struct file *file)
 	return 0;
 }
 
+SEC("lsm_cgroup/file_open")
+__description("sleepable lsm_cgroup program is rejected")
+__failure __msg("Program of this type cannot be sleepable")
+__flag(BPF_F_SLEEPABLE)
+int BPF_PROG(sleepable_lsm_cgroup)
+{
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";

base-commit: 30dee2c176e7954f63d1fa3e52d172f30beb9bfb
-- 
2.53.0