bpf: selftests: Test constant key extraction on irrelevant maps

Test that very high constant map keys are not interpreted as an error value by the verifier. This would previously fail. Acked-by: Eduard Zingerman <[email protected]> Signed-off-by: Daniel Xu <[email protected]>
kernel-patches · Feb 6, 2025 · 485237d · 485237d
1 parent 64e21f9
commit 485237d
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/tools/testing/selftests/bpf/progs/verifier_array_access.c b/tools/testing/selftests/bpf/progs/verifier_array_access.c
@@ -713,4 +713,19 @@ unsigned int non_stack_key_lookup(void)
 	return val->index;
 }
 
+SEC("socket")
+__description("doesn't reject UINT64_MAX as s64 for irrelevant maps")
+__success __retval(42)
+unsigned int doesnt_reject_irrelevant_maps(void)
+{
+	__u64 key = 0xFFFFFFFFFFFFFFFF;
+	struct test_val *val;
+
+	val = bpf_map_lookup_elem(&map_hash_48b, &key);
+	if (val)
+		return val->index;
+
+	return 42;
+}
+
 char _license[] SEC("license") = "GPL";