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