#include <network_helpers.h>
#include "local_kptr_stash.skel.h"
+#include "local_kptr_stash_fail.skel.h"
static void test_local_kptr_stash_simple(void)
{
LIBBPF_OPTS(bpf_test_run_opts, opts,
local_kptr_stash__destroy(skel);
}
-void test_local_kptr_stash_success(void)
+static void test_local_kptr_stash_fail(void)
+{
+ RUN_TESTS(local_kptr_stash_fail);
+}
+
+void test_local_kptr_stash(void)
{
if (test__start_subtest("local_kptr_stash_simple"))
test_local_kptr_stash_simple();
if (test__start_subtest("local_kptr_stash_unstash"))
test_local_kptr_stash_unstash();
+ if (test__start_subtest("local_kptr_stash_fail"))
+ test_local_kptr_stash_fail();
}
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
+
+#include <vmlinux.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_core_read.h>
+#include "../bpf_experimental.h"
+#include "bpf_misc.h"
+
+struct node_data {
+ long key;
+ long data;
+ struct bpf_rb_node node;
+};
+
+struct map_value {
+ struct node_data __kptr *node;
+};
+
+struct node_data2 {
+ long key[4];
+};
+
+/* This is necessary so that LLVM generates BTF for node_data struct
+ * If it's not included, a fwd reference for node_data will be generated but
+ * no struct. Example BTF of "node" field in map_value when not included:
+ *
+ * [10] PTR '(anon)' type_id=35
+ * [34] FWD 'node_data' fwd_kind=struct
+ * [35] TYPE_TAG 'kptr_ref' type_id=34
+ */
+struct node_data *just_here_because_btf_bug;
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __type(key, int);
+ __type(value, struct map_value);
+ __uint(max_entries, 2);
+} some_nodes SEC(".maps");
+
+SEC("tc")
+__failure __msg("invalid kptr access, R2 type=ptr_node_data2 expected=ptr_node_data")
+long stash_rb_nodes(void *ctx)
+{
+ struct map_value *mapval;
+ struct node_data2 *res;
+ int idx = 0;
+
+ mapval = bpf_map_lookup_elem(&some_nodes, &idx);
+ if (!mapval)
+ return 1;
+
+ res = bpf_obj_new(typeof(*res));
+ if (!res)
+ return 1;
+ res->key[0] = 40;
+
+ res = bpf_kptr_xchg(&mapval->node, res);
+ if (res)
+ bpf_obj_drop(res);
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";