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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#include <bpf/btf.h>
/* real layout and sizes according to test's (32-bit) BTF
* needs to be defined before skeleton is included */
struct test_struct___real {
unsigned int ptr; /* can't use `void *`, it is always 8 byte in BPF target */
unsigned int val2;
unsigned long long val1;
unsigned short val3;
unsigned char val4;
unsigned char _pad;
};
#include "test_core_autosize.skel.h"
static int duration = 0;
static struct {
unsigned long long ptr_samesized;
unsigned long long val1_samesized;
unsigned long long val2_samesized;
unsigned long long val3_samesized;
unsigned long long val4_samesized;
struct test_struct___real output_samesized;
unsigned long long ptr_downsized;
unsigned long long val1_downsized;
unsigned long long val2_downsized;
unsigned long long val3_downsized;
unsigned long long val4_downsized;
struct test_struct___real output_downsized;
unsigned long long ptr_probed;
unsigned long long val1_probed;
unsigned long long val2_probed;
unsigned long long val3_probed;
unsigned long long val4_probed;
unsigned long long ptr_signed;
unsigned long long val1_signed;
unsigned long long val2_signed;
unsigned long long val3_signed;
unsigned long long val4_signed;
struct test_struct___real output_signed;
} out;
void test_core_autosize(void)
{
char btf_file[] = "/tmp/core_autosize.btf.XXXXXX";
int err, fd = -1, zero = 0;
int char_id, short_id, int_id, long_long_id, void_ptr_id, id;
struct test_core_autosize* skel = NULL;
struct bpf_object_load_attr load_attr = {};
struct bpf_program *prog;
struct bpf_map *bss_map;
struct btf *btf = NULL;
size_t written;
const void *raw_data;
__u32 raw_sz;
FILE *f = NULL;
btf = btf__new_empty();
if (!ASSERT_OK_PTR(btf, "empty_btf"))
return;
/* Emit the following struct with 32-bit pointer size:
*
* struct test_struct {
* void *ptr;
* unsigned long val2;
* unsigned long long val1;
* unsigned short val3;
* unsigned char val4;
* char: 8;
* };
*
* This struct is going to be used as the "kernel BTF" for this test.
* It's equivalent memory-layout-wise to test_struct__real above.
*/
/* force 32-bit pointer size */
btf__set_pointer_size(btf, 4);
char_id = btf__add_int(btf, "unsigned char", 1, 0);
ASSERT_EQ(char_id, 1, "char_id");
short_id = btf__add_int(btf, "unsigned short", 2, 0);
ASSERT_EQ(short_id, 2, "short_id");
/* "long unsigned int" of 4 byte size tells BTF that sizeof(void *) == 4 */
int_id = btf__add_int(btf, "long unsigned int", 4, 0);
ASSERT_EQ(int_id, 3, "int_id");
long_long_id = btf__add_int(btf, "unsigned long long", 8, 0);
ASSERT_EQ(long_long_id, 4, "long_long_id");
void_ptr_id = btf__add_ptr(btf, 0);
ASSERT_EQ(void_ptr_id, 5, "void_ptr_id");
id = btf__add_struct(btf, "test_struct", 20 /* bytes */);
ASSERT_EQ(id, 6, "struct_id");
err = btf__add_field(btf, "ptr", void_ptr_id, 0, 0);
err = err ?: btf__add_field(btf, "val2", int_id, 32, 0);
err = err ?: btf__add_field(btf, "val1", long_long_id, 64, 0);
err = err ?: btf__add_field(btf, "val3", short_id, 128, 0);
err = err ?: btf__add_field(btf, "val4", char_id, 144, 0);
ASSERT_OK(err, "struct_fields");
fd = mkstemp(btf_file);
if (CHECK(fd < 0, "btf_tmp", "failed to create file: %d\n", fd))
goto cleanup;
f = fdopen(fd, "w");
if (!ASSERT_OK_PTR(f, "btf_fdopen"))
goto cleanup;
raw_data = btf__get_raw_data(btf, &raw_sz);
if (!ASSERT_OK_PTR(raw_data, "raw_data"))
goto cleanup;
written = fwrite(raw_data, 1, raw_sz, f);
if (CHECK(written != raw_sz, "btf_write", "written: %zu, errno: %d\n", written, errno))
goto cleanup;
fflush(f);
fclose(f);
f = NULL;
close(fd);
fd = -1;
/* open and load BPF program with custom BTF as the kernel BTF */
skel = test_core_autosize__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
/* disable handle_signed() for now */
prog = bpf_object__find_program_by_name(skel->obj, "handle_signed");
if (!ASSERT_OK_PTR(prog, "prog_find"))
goto cleanup;
bpf_program__set_autoload(prog, false);
load_attr.obj = skel->obj;
load_attr.target_btf_path = btf_file;
err = bpf_object__load_xattr(&load_attr);
if (!ASSERT_OK(err, "prog_load"))
goto cleanup;
prog = bpf_object__find_program_by_name(skel->obj, "handle_samesize");
if (!ASSERT_OK_PTR(prog, "prog_find"))
goto cleanup;
skel->links.handle_samesize = bpf_program__attach(prog);
if (!ASSERT_OK_PTR(skel->links.handle_samesize, "prog_attach"))
goto cleanup;
prog = bpf_object__find_program_by_name(skel->obj, "handle_downsize");
if (!ASSERT_OK_PTR(prog, "prog_find"))
goto cleanup;
skel->links.handle_downsize = bpf_program__attach(prog);
if (!ASSERT_OK_PTR(skel->links.handle_downsize, "prog_attach"))
goto cleanup;
prog = bpf_object__find_program_by_name(skel->obj, "handle_probed");
if (!ASSERT_OK_PTR(prog, "prog_find"))
goto cleanup;
skel->links.handle_probed = bpf_program__attach(prog);
if (!ASSERT_OK_PTR(skel->links.handle_probed, "prog_attach"))
goto cleanup;
usleep(1);
bss_map = bpf_object__find_map_by_name(skel->obj, "test_cor.bss");
if (!ASSERT_OK_PTR(bss_map, "bss_map_find"))
goto cleanup;
err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &zero, (void *)&out);
if (!ASSERT_OK(err, "bss_lookup"))
goto cleanup;
ASSERT_EQ(out.ptr_samesized, 0x01020304, "ptr_samesized");
ASSERT_EQ(out.val1_samesized, 0x1020304050607080, "val1_samesized");
ASSERT_EQ(out.val2_samesized, 0x0a0b0c0d, "val2_samesized");
ASSERT_EQ(out.val3_samesized, 0xfeed, "val3_samesized");
ASSERT_EQ(out.val4_samesized, 0xb9, "val4_samesized");
ASSERT_EQ(out.output_samesized.ptr, 0x01020304, "ptr_samesized");
ASSERT_EQ(out.output_samesized.val1, 0x1020304050607080, "val1_samesized");
ASSERT_EQ(out.output_samesized.val2, 0x0a0b0c0d, "val2_samesized");
ASSERT_EQ(out.output_samesized.val3, 0xfeed, "val3_samesized");
ASSERT_EQ(out.output_samesized.val4, 0xb9, "val4_samesized");
ASSERT_EQ(out.ptr_downsized, 0x01020304, "ptr_downsized");
ASSERT_EQ(out.val1_downsized, 0x1020304050607080, "val1_downsized");
ASSERT_EQ(out.val2_downsized, 0x0a0b0c0d, "val2_downsized");
ASSERT_EQ(out.val3_downsized, 0xfeed, "val3_downsized");
ASSERT_EQ(out.val4_downsized, 0xb9, "val4_downsized");
ASSERT_EQ(out.output_downsized.ptr, 0x01020304, "ptr_downsized");
ASSERT_EQ(out.output_downsized.val1, 0x1020304050607080, "val1_downsized");
ASSERT_EQ(out.output_downsized.val2, 0x0a0b0c0d, "val2_downsized");
ASSERT_EQ(out.output_downsized.val3, 0xfeed, "val3_downsized");
ASSERT_EQ(out.output_downsized.val4, 0xb9, "val4_downsized");
ASSERT_EQ(out.ptr_probed, 0x01020304, "ptr_probed");
ASSERT_EQ(out.val1_probed, 0x1020304050607080, "val1_probed");
ASSERT_EQ(out.val2_probed, 0x0a0b0c0d, "val2_probed");
ASSERT_EQ(out.val3_probed, 0xfeed, "val3_probed");
ASSERT_EQ(out.val4_probed, 0xb9, "val4_probed");
test_core_autosize__destroy(skel);
skel = NULL;
/* now re-load with handle_signed() enabled, it should fail loading */
skel = test_core_autosize__open();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
load_attr.obj = skel->obj;
load_attr.target_btf_path = btf_file;
err = bpf_object__load_xattr(&load_attr);
if (!ASSERT_ERR(err, "bad_prog_load"))
goto cleanup;
cleanup:
if (f)
fclose(f);
if (fd >= 0)
close(fd);
remove(btf_file);
btf__free(btf);
test_core_autosize__destroy(skel);
}
|
