1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Google */
3
4 #include <test_progs.h>
5 #include <bpf/libbpf.h>
6 #include <bpf/btf.h>
7 #include "test_ksyms_btf.skel.h"
8 #include "test_ksyms_btf_null_check.skel.h"
9 #include "test_ksyms_weak.skel.h"
10 #include "test_ksyms_weak.lskel.h"
11 #include "test_ksyms_btf_write_check.skel.h"
12
13 static int duration;
14
15 static void test_basic(void)
16 {
17 __u64 runqueues_addr, bpf_prog_active_addr;
18 __u32 this_rq_cpu;
19 int this_bpf_prog_active;
20 struct test_ksyms_btf *skel = NULL;
21 struct test_ksyms_btf__data *data;
22 int err;
23
24 err = kallsyms_find("runqueues", &runqueues_addr);
25 if (CHECK(err == -EINVAL, "kallsyms_fopen", "failed to open: %d\n", errno))
26 return;
27 if (CHECK(err == -ENOENT, "ksym_find", "symbol 'runqueues' not found\n"))
28 return;
29
30 err = kallsyms_find("bpf_prog_active", &bpf_prog_active_addr);
31 if (CHECK(err == -EINVAL, "kallsyms_fopen", "failed to open: %d\n", errno))
32 return;
33 if (CHECK(err == -ENOENT, "ksym_find", "symbol 'bpf_prog_active' not found\n"))
34 return;
35
36 skel = test_ksyms_btf__open_and_load();
37 if (CHECK(!skel, "skel_open", "failed to open and load skeleton\n"))
38 goto cleanup;
39
40 err = test_ksyms_btf__attach(skel);
41 if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
42 goto cleanup;
43
44 /* trigger tracepoint */
45 usleep(1);
46
47 data = skel->data;
48 CHECK(data->out__runqueues_addr != runqueues_addr, "runqueues_addr",
49 "got %llu, exp %llu\n",
50 (unsigned long long)data->out__runqueues_addr,
51 (unsigned long long)runqueues_addr);
52 CHECK(data->out__bpf_prog_active_addr != bpf_prog_active_addr, "bpf_prog_active_addr",
53 "got %llu, exp %llu\n",
54 (unsigned long long)data->out__bpf_prog_active_addr,
55 (unsigned long long)bpf_prog_active_addr);
56
57 CHECK(data->out__rq_cpu == -1, "rq_cpu",
58 "got %u, exp != -1\n", data->out__rq_cpu);
59 CHECK(data->out__bpf_prog_active < 0, "bpf_prog_active",
60 "got %d, exp >= 0\n", data->out__bpf_prog_active);
61 CHECK(data->out__cpu_0_rq_cpu != 0, "cpu_rq(0)->cpu",
62 "got %u, exp 0\n", data->out__cpu_0_rq_cpu);
63
64 this_rq_cpu = data->out__this_rq_cpu;
65 CHECK(this_rq_cpu != data->out__rq_cpu, "this_rq_cpu",
66 "got %u, exp %u\n", this_rq_cpu, data->out__rq_cpu);
67
68 this_bpf_prog_active = data->out__this_bpf_prog_active;
69 CHECK(this_bpf_prog_active != data->out__bpf_prog_active, "this_bpf_prog_active",
70 "got %d, exp %d\n", this_bpf_prog_active,
71 data->out__bpf_prog_active);
72
73 cleanup:
74 test_ksyms_btf__destroy(skel);
75 }
76
77 static void test_null_check(void)
78 {
79 struct test_ksyms_btf_null_check *skel;
80
81 skel = test_ksyms_btf_null_check__open_and_load();
82 CHECK(skel, "skel_open", "unexpected load of a prog missing null check\n");
83
84 test_ksyms_btf_null_check__destroy(skel);
85 }
86
87 static void test_weak_syms(void)
88 {
89 struct test_ksyms_weak *skel;
90 struct test_ksyms_weak__data *data;
91 int err;
92
93 skel = test_ksyms_weak__open_and_load();
94 if (!ASSERT_OK_PTR(skel, "test_ksyms_weak__open_and_load"))
95 return;
96
97 err = test_ksyms_weak__attach(skel);
98 if (!ASSERT_OK(err, "test_ksyms_weak__attach"))
99 goto cleanup;
100
101 /* trigger tracepoint */
102 usleep(1);
103
104 data = skel->data;
105 ASSERT_EQ(data->out__existing_typed, 0, "existing typed ksym");
106 ASSERT_NEQ(data->out__existing_typeless, -1, "existing typeless ksym");
107 ASSERT_EQ(data->out__non_existent_typeless, 0, "nonexistent typeless ksym");
108 ASSERT_EQ(data->out__non_existent_typed, 0, "nonexistent typed ksym");
109
110 cleanup:
111 test_ksyms_weak__destroy(skel);
112 }
113
114 static void test_weak_syms_lskel(void)
115 {
116 struct test_ksyms_weak_lskel *skel;
117 struct test_ksyms_weak_lskel__data *data;
118 int err;
119
120 skel = test_ksyms_weak_lskel__open_and_load();
121 if (!ASSERT_OK_PTR(skel, "test_ksyms_weak_lskel__open_and_load"))
122 return;
123
124 err = test_ksyms_weak_lskel__attach(skel);
125 if (!ASSERT_OK(err, "test_ksyms_weak_lskel__attach"))
126 goto cleanup;
127
128 /* trigger tracepoint */
129 usleep(1);
130
131 data = skel->data;
132 ASSERT_EQ(data->out__existing_typed, 0, "existing typed ksym");
133 ASSERT_NEQ(data->out__existing_typeless, -1, "existing typeless ksym");
134 ASSERT_EQ(data->out__non_existent_typeless, 0, "nonexistent typeless ksym");
135 ASSERT_EQ(data->out__non_existent_typed, 0, "nonexistent typed ksym");
136
137 cleanup:
138 test_ksyms_weak_lskel__destroy(skel);
139 }
140
141 static void test_write_check(bool test_handler1)
142 {
143 struct test_ksyms_btf_write_check *skel;
144
145 skel = test_ksyms_btf_write_check__open();
146 if (!ASSERT_OK_PTR(skel, "test_ksyms_btf_write_check__open"))
147 return;
148 bpf_program__set_autoload(test_handler1 ? skel->progs.handler2 : skel->progs.handler1, false);
149 ASSERT_ERR(test_ksyms_btf_write_check__load(skel),
150 "unexpected load of a prog writing to ksym memory\n");
151
152 test_ksyms_btf_write_check__destroy(skel);
153 }
154
155 void test_ksyms_btf(void)
156 {
157 int percpu_datasec;
158 struct btf *btf;
159
160 btf = libbpf_find_kernel_btf();
161 if (!ASSERT_OK_PTR(btf, "btf_exists"))
162 return;
163
164 percpu_datasec = btf__find_by_name_kind(btf, ".data..percpu",
165 BTF_KIND_DATASEC);
166 btf__free(btf);
167 if (percpu_datasec < 0) {
168 printf("%s:SKIP:no PERCPU DATASEC in kernel btf\n",
169 __func__);
170 test__skip();
171 return;
172 }
173
174 if (test__start_subtest("basic"))
175 test_basic();
176
177 if (test__start_subtest("null_check"))
178 test_null_check();
179
180 if (test__start_subtest("weak_ksyms"))
181 test_weak_syms();
182
183 if (test__start_subtest("weak_ksyms_lskel"))
184 test_weak_syms_lskel();
185
186 if (test__start_subtest("write_check1"))
187 test_write_check(true);
188
189 if (test__start_subtest("write_check2"))
190 test_write_check(false);
191 }
192
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