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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#define _GNU_SOURCE
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/io.h>
#include <sys/ioctl.h>
#include <sys/reboot.h>
#include <sys/utsname.h>
#include <sys/sendfile.h>
#include <sys/sysmacros.h>
#include <sys/random.h>
#include <linux/random.h>
#include <linux/version.h>
__attribute__((noreturn)) static void poweroff(void)
{
fflush(stdout);
fflush(stderr);
reboot(RB_AUTOBOOT);
sleep(30);
fprintf(stderr, "\x1b[37m\x1b[41m\x1b[1mFailed to power off!!!\x1b[0m\n");
exit(1);
}
static void panic(const char *what)
{
fprintf(stderr, "\n\n\x1b[37m\x1b[41m\x1b[1mSOMETHING WENT HORRIBLY WRONG\x1b[0m\n\n \x1b[31m\x1b[1m%s: %s\x1b[0m\n\n\x1b[37m\x1b[44m\x1b[1mPower off...\x1b[0m\n\n", what, strerror(errno));
poweroff();
}
#define pretty_message(msg) puts("\x1b[32m\x1b[1m" msg "\x1b[0m")
static void print_banner(void)
{
struct utsname utsname;
int len;
if (uname(&utsname) < 0)
panic("uname");
len = strlen(" WireGuard Test Suite on ") + strlen(utsname.sysname) + strlen(utsname.release) + strlen(utsname.machine);
printf("\x1b[45m\x1b[33m\x1b[1m%*.s\x1b[0m\n\x1b[45m\x1b[33m\x1b[1m WireGuard Test Suite on %s %s %s \x1b[0m\n\x1b[45m\x1b[33m\x1b[1m%*.s\x1b[0m\n\n", len, "", utsname.sysname, utsname.release, utsname.machine, len, "");
}
static void seed_rng(void)
{
int bits = 256, fd;
if (!getrandom(NULL, 0, GRND_NONBLOCK))
return;
pretty_message("[+] Fake seeding RNG...");
fd = open("/dev/random", O_WRONLY);
if (fd < 0)
panic("open(random)");
if (ioctl(fd, RNDADDTOENTCNT, &bits) < 0)
panic("ioctl(RNDADDTOENTCNT)");
close(fd);
}
static void mount_filesystems(void)
{
pretty_message("[+] Mounting filesystems...");
mkdir("/dev", 0755);
mkdir("/proc", 0755);
mkdir("/sys", 0755);
mkdir("/tmp", 0755);
mkdir("/run", 0755);
mkdir("/var", 0755);
if (mount("none", "/dev", "devtmpfs", 0, NULL))
panic("devtmpfs mount");
if (mount("none", "/proc", "proc", 0, NULL))
panic("procfs mount");
if (mount("none", "/sys", "sysfs", 0, NULL))
panic("sysfs mount");
if (mount("none", "/tmp", "tmpfs", 0, NULL))
panic("tmpfs mount");
if (mount("none", "/run", "tmpfs", 0, NULL))
panic("tmpfs mount");
if (mount("none", "/sys/kernel/debug", "debugfs", 0, NULL))
; /* Not a problem if it fails.*/
if (symlink("/run", "/var/run"))
panic("run symlink");
if (symlink("/proc/self/fd", "/dev/fd"))
panic("fd symlink");
}
static void enable_logging(void)
{
int fd;
pretty_message("[+] Enabling logging...");
fd = open("/proc/sys/kernel/printk", O_WRONLY);
if (fd >= 0) {
if (write(fd, "9\n", 2) != 2)
panic("write(printk)");
close(fd);
}
fd = open("/proc/sys/debug/exception-trace", O_WRONLY);
if (fd >= 0) {
if (write(fd, "1\n", 2) != 2)
panic("write(exception-trace)");
close(fd);
}
}
static void kmod_selftests(void)
{
FILE *file;
char line[2048], *start, *pass;
bool success = true;
pretty_message("[+] Module self-tests:");
file = fopen("/proc/kmsg", "r");
if (!file)
panic("fopen(kmsg)");
if (fcntl(fileno(file), F_SETFL, O_NONBLOCK) < 0)
panic("fcntl(kmsg, nonblock)");
while (fgets(line, sizeof(line), file)) {
start = strstr(line, "wireguard: ");
if (!start)
continue;
start += 11;
*strchrnul(start, '\n') = '\0';
if (strstr(start, "www.wireguard.com"))
break;
pass = strstr(start, ": pass");
if (!pass || pass[6] != '\0') {
success = false;
printf(" \x1b[31m* %s\x1b[0m\n", start);
} else
printf(" \x1b[32m* %s\x1b[0m\n", start);
}
fclose(file);
if (!success) {
puts("\x1b[31m\x1b[1m[-] Tests failed! \u2639\x1b[0m");
poweroff();
}
}
static void launch_tests(void)
{
char cmdline[4096], *success_dev;
int status, fd;
pid_t pid;
pretty_message("[+] Launching tests...");
pid = fork();
if (pid == -1)
panic("fork");
else if (pid == 0) {
execl("/init.sh", "init", NULL);
panic("exec");
}
if (waitpid(pid, &status, 0) < 0)
panic("waitpid");
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
pretty_message("[+] Tests successful! :-)");
fd = open("/proc/cmdline", O_RDONLY);
if (fd < 0)
panic("open(/proc/cmdline)");
if (read(fd, cmdline, sizeof(cmdline) - 1) <= 0)
panic("read(/proc/cmdline)");
cmdline[sizeof(cmdline) - 1] = '\0';
for (success_dev = strtok(cmdline, " \n"); success_dev; success_dev = strtok(NULL, " \n")) {
if (strncmp(success_dev, "wg.success=", 11))
continue;
memcpy(success_dev + 11 - 5, "/dev/", 5);
success_dev += 11 - 5;
break;
}
if (!success_dev || !strlen(success_dev))
panic("Unable to find success device");
fd = open(success_dev, O_WRONLY);
if (fd < 0)
panic("open(success_dev)");
if (write(fd, "success\n", 8) != 8)
panic("write(success_dev)");
close(fd);
} else {
const char *why = "unknown cause";
int what = -1;
if (WIFEXITED(status)) {
why = "exit code";
what = WEXITSTATUS(status);
} else if (WIFSIGNALED(status)) {
why = "signal";
what = WTERMSIG(status);
}
printf("\x1b[31m\x1b[1m[-] Tests failed with %s %d! \u2639\x1b[0m\n", why, what);
}
}
static void ensure_console(void)
{
for (unsigned int i = 0; i < 1000; ++i) {
int fd = open("/dev/console", O_RDWR);
if (fd < 0) {
usleep(50000);
continue;
}
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
close(fd);
if (write(1, "\0\0\0\0\n", 5) == 5)
return;
}
panic("Unable to open console device");
}
static void clear_leaks(void)
{
int fd;
fd = open("/sys/kernel/debug/kmemleak", O_WRONLY);
if (fd < 0)
return;
pretty_message("[+] Starting memory leak detection...");
write(fd, "clear\n", 5);
close(fd);
}
static void check_leaks(void)
{
int fd;
fd = open("/sys/kernel/debug/kmemleak", O_WRONLY);
if (fd < 0)
return;
pretty_message("[+] Scanning for memory leaks...");
sleep(2); /* Wait for any grace periods. */
write(fd, "scan\n", 5);
close(fd);
fd = open("/sys/kernel/debug/kmemleak", O_RDONLY);
if (fd < 0)
return;
if (sendfile(1, fd, NULL, 0x7ffff000) > 0)
panic("Memory leaks encountered");
close(fd);
}
int main(int argc, char *argv[])
{
ensure_console();
print_banner();
mount_filesystems();
seed_rng();
kmod_selftests();
enable_logging();
clear_leaks();
launch_tests();
check_leaks();
poweroff();
return 1;
}
|
