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}