1// SPDX-License-Identifier: GPL-2.0
2
3/*
4 * Copyright (C) 2022 Huawei Technologies Duesseldorf GmbH
5 *
6 * Author: Roberto Sassu <roberto.sassu@huawei.com>
7 */
8
9#include <linux/keyctl.h>
10#include <test_progs.h>
11
12#include "test_lookup_key.skel.h"
13
14#define KEY_LOOKUP_CREATE	0x01
15#define KEY_LOOKUP_PARTIAL	0x02
16
17static bool kfunc_not_supported;
18
19static int libbpf_print_cb(enum libbpf_print_level level, const char *fmt,
20			   va_list args)
21{
22	char *func;
23
24	if (strcmp(fmt, "libbpf: extern (func ksym) '%s': not found in kernel or module BTFs\n"))
25		return 0;
26
27	func = va_arg(args, char *);
28
29	if (strcmp(func, "bpf_lookup_user_key") && strcmp(func, "bpf_key_put") &&
30	    strcmp(func, "bpf_lookup_system_key"))
31		return 0;
32
33	kfunc_not_supported = true;
34	return 0;
35}
36
37void test_lookup_key(void)
38{
39	libbpf_print_fn_t old_print_cb;
40	struct test_lookup_key *skel;
41	__u32 next_id;
42	int ret;
43
44	skel = test_lookup_key__open();
45	if (!ASSERT_OK_PTR(skel, "test_lookup_key__open"))
46		return;
47
48	old_print_cb = libbpf_set_print(libbpf_print_cb);
49	ret = test_lookup_key__load(skel);
50	libbpf_set_print(old_print_cb);
51
52	if (ret < 0 && kfunc_not_supported) {
53		printf("%s:SKIP:bpf_lookup_*_key(), bpf_key_put() kfuncs not supported\n",
54		       __func__);
55		test__skip();
56		goto close_prog;
57	}
58
59	if (!ASSERT_OK(ret, "test_lookup_key__load"))
60		goto close_prog;
61
62	ret = test_lookup_key__attach(skel);
63	if (!ASSERT_OK(ret, "test_lookup_key__attach"))
64		goto close_prog;
65
66	skel->bss->monitored_pid = getpid();
67	skel->bss->key_serial = KEY_SPEC_THREAD_KEYRING;
68
69	/* The thread-specific keyring does not exist, this test fails. */
70	skel->bss->flags = 0;
71
72	ret = bpf_prog_get_next_id(0, &next_id);
73	if (!ASSERT_LT(ret, 0, "bpf_prog_get_next_id"))
74		goto close_prog;
75
76	/* Force creation of the thread-specific keyring, this test succeeds. */
77	skel->bss->flags = KEY_LOOKUP_CREATE;
78
79	ret = bpf_prog_get_next_id(0, &next_id);
80	if (!ASSERT_OK(ret, "bpf_prog_get_next_id"))
81		goto close_prog;
82
83	/* Pass both lookup flags for parameter validation. */
84	skel->bss->flags = KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL;
85
86	ret = bpf_prog_get_next_id(0, &next_id);
87	if (!ASSERT_OK(ret, "bpf_prog_get_next_id"))
88		goto close_prog;
89
90	/* Pass invalid flags. */
91	skel->bss->flags = UINT64_MAX;
92
93	ret = bpf_prog_get_next_id(0, &next_id);
94	if (!ASSERT_LT(ret, 0, "bpf_prog_get_next_id"))
95		goto close_prog;
96
97	skel->bss->key_serial = 0;
98	skel->bss->key_id = 1;
99
100	ret = bpf_prog_get_next_id(0, &next_id);
101	if (!ASSERT_OK(ret, "bpf_prog_get_next_id"))
102		goto close_prog;
103
104	skel->bss->key_id = UINT32_MAX;
105
106	ret = bpf_prog_get_next_id(0, &next_id);
107	ASSERT_LT(ret, 0, "bpf_prog_get_next_id");
108
109close_prog:
110	skel->bss->monitored_pid = 0;
111	test_lookup_key__destroy(skel);
112}
113