1// SPDX-License-Identifier: GPL-2.0
2
3/*
4 * Copyright (c) 2022 Facebook
5 * Copyright (C) 2022 Huawei Technologies Duesseldorf GmbH
6 *
7 * Author: Roberto Sassu <roberto.sassu@huawei.com>
8 */
9
10#include <test_progs.h>
11#include "test_kfunc_dynptr_param.skel.h"
12
13static struct {
14	const char *prog_name;
15	int expected_runtime_err;
16} kfunc_dynptr_tests[] = {
17	{"dynptr_data_null", -EBADMSG},
18};
19
20static bool kfunc_not_supported;
21
22static int libbpf_print_cb(enum libbpf_print_level level, const char *fmt,
23			   va_list args)
24{
25	if (strcmp(fmt, "libbpf: extern (func ksym) '%s': not found in kernel or module BTFs\n"))
26		return 0;
27
28	if (strcmp(va_arg(args, char *), "bpf_verify_pkcs7_signature"))
29		return 0;
30
31	kfunc_not_supported = true;
32	return 0;
33}
34
35static bool has_pkcs7_kfunc_support(void)
36{
37	struct test_kfunc_dynptr_param *skel;
38	libbpf_print_fn_t old_print_cb;
39	int err;
40
41	skel = test_kfunc_dynptr_param__open();
42	if (!ASSERT_OK_PTR(skel, "test_kfunc_dynptr_param__open"))
43		return false;
44
45	kfunc_not_supported = false;
46
47	old_print_cb = libbpf_set_print(libbpf_print_cb);
48	err = test_kfunc_dynptr_param__load(skel);
49	libbpf_set_print(old_print_cb);
50
51	if (err < 0 && kfunc_not_supported) {
52		fprintf(stderr,
53		  "%s:SKIP:bpf_verify_pkcs7_signature() kfunc not supported\n",
54		  __func__);
55		test_kfunc_dynptr_param__destroy(skel);
56		return false;
57	}
58
59	test_kfunc_dynptr_param__destroy(skel);
60
61	return true;
62}
63
64static void verify_success(const char *prog_name, int expected_runtime_err)
65{
66	struct test_kfunc_dynptr_param *skel;
67	struct bpf_program *prog;
68	struct bpf_link *link;
69	__u32 next_id;
70	int err;
71
72	skel = test_kfunc_dynptr_param__open();
73	if (!ASSERT_OK_PTR(skel, "test_kfunc_dynptr_param__open"))
74		return;
75
76	skel->bss->pid = getpid();
77
78	err = test_kfunc_dynptr_param__load(skel);
79
80	if (!ASSERT_OK(err, "test_kfunc_dynptr_param__load"))
81		goto cleanup;
82
83	prog = bpf_object__find_program_by_name(skel->obj, prog_name);
84	if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
85		goto cleanup;
86
87	link = bpf_program__attach(prog);
88	if (!ASSERT_OK_PTR(link, "bpf_program__attach"))
89		goto cleanup;
90
91	err = bpf_prog_get_next_id(0, &next_id);
92
93	bpf_link__destroy(link);
94
95	if (!ASSERT_OK(err, "bpf_prog_get_next_id"))
96		goto cleanup;
97
98	ASSERT_EQ(skel->bss->err, expected_runtime_err, "err");
99
100cleanup:
101	test_kfunc_dynptr_param__destroy(skel);
102}
103
104void test_kfunc_dynptr_param(void)
105{
106	int i;
107
108	if (!has_pkcs7_kfunc_support())
109		return;
110
111	for (i = 0; i < ARRAY_SIZE(kfunc_dynptr_tests); i++) {
112		if (!test__start_subtest(kfunc_dynptr_tests[i].prog_name))
113			continue;
114
115		verify_success(kfunc_dynptr_tests[i].prog_name,
116			kfunc_dynptr_tests[i].expected_runtime_err);
117	}
118	RUN_TESTS(test_kfunc_dynptr_param);
119}
120