[PATCH bpf v2 2/2] selftests/bpf: Test passing scalar NULL to nonnull global subprog

[Amery Hung <ameryhung@gmail.com>]

Make sure the verifier reject passing a hardcoded NULL to an
__arg_nonnull argument.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
---
 .../selftests/bpf/progs/verifier_global_subprogs.c     | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c b/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
index 75a2e3f48d0f..67dc352addfd 100644
--- a/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
+++ b/tools/testing/selftests/bpf/progs/verifier_global_subprogs.c
@@ -185,6 +185,16 @@ int arg_tag_nonnull_ptr_good(void *ctx)
 	return subprog_nonnull_ptr_good(&x, &y);
 }
 
+SEC("?raw_tp")
+__failure __log_level(2)
+__msg("R1 is expected to be non-NULL")
+int arg_tag_nonnull_ptr_null_bad(void *ctx)
+{
+	int y = 74;
+
+	return subprog_nonnull_ptr_good(NULL, &y);
+}
+
 /* this global subprog can be now called from many types of entry progs, each
  * with different context type
  */
-- 
2.52.0