[PATCH 2/2] selftests/bpf: Add a test for the type checking of iter args

[Tao Lyu <tao.lyu@xxxxxxx>]

This is a selftest for the type checking of iter arguments.
When passing a PTR_TO_MAP_VALUE to bpf_iter_num_* kfuncs, the program should be rejected.

Signed-off-by: Tao Lyu <tao.lyu@xxxxxxx>
---
 tools/testing/selftests/bpf/progs/iters.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/iters.c b/tools/testing/selftests/bpf/progs/iters.c
index ef70b88bccb2..0a2df20afa30 100644
--- a/tools/testing/selftests/bpf/progs/iters.c
+++ b/tools/testing/selftests/bpf/progs/iters.c
@@ -1486,4 +1486,25 @@ int iter_subprog_check_stacksafe(const void *ctx)
 	return 0;
 }
 
+SEC("raw_tp")
+__failure __msg("arg#0 expected pointer to the iterator")
+int iter_check_arg_type(const void *ctx)
+{
+        struct bpf_iter_num it;
+        int *v;
+
+        int *map_val = NULL;
+        int key = 0;
+
+        map_val = bpf_map_lookup_elem(&arr_map, &key);
+        if (!map_val)
+                return 0;
+
+        bpf_iter_num_new(&it, 0, 3);
+        while ((v = bpf_iter_num_next((struct bpf_iter_num*)map_val))) {}
+        bpf_iter_num_destroy(&it);
+
+        return 0;
+}
+
 char _license[] SEC("license") = "GPL";
-- 
2.34.1