tools/testing/selftests/wireguard/qemu/init.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
   4  */
   5
   6 #define _GNU_SOURCE
   7 #include <unistd.h>
   8 #include <errno.h>
   9 #include <string.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <stdbool.h>
  13 #include <fcntl.h>
  14 #include <sys/wait.h>
  15 #include <sys/mount.h>
  16 #include <sys/stat.h>
  17 #include <sys/types.h>
  18 #include <sys/io.h>
  19 #include <sys/ioctl.h>
  20 #include <sys/reboot.h>
  21 #include <sys/utsname.h>
  22 #include <sys/sendfile.h>
  23 #include <sys/sysmacros.h>
  24 #include <linux/random.h>
  25 #include <linux/version.h>
  26
  27 __attribute__((noreturn)) static void poweroff(void)
  28 {
  29         fflush(stdout);
  30         fflush(stderr);
  31         reboot(RB_AUTOBOOT);
  32         sleep(30);
  33         fprintf(stderr, "\x1b[37m\x1b[41m\x1b[1mFailed to power off!!!\x1b[0m\n");
  34         exit(1);
  35 }
  36
  37 static void panic(const char *what)
  38 {
  39         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));
  40         poweroff();
  41 }
  42
  43 #define pretty_message(msg) puts("\x1b[32m\x1b[1m" msg "\x1b[0m")
  44
  45 static void print_banner(void)
  46 {
  47         struct utsname utsname;
  48         int len;
  49
  50         if (uname(&utsname) < 0)
  51                 panic("uname");
  52
  53         len = strlen("    WireGuard Test Suite on       ") + strlen(utsname.sysname) + strlen(utsname.release) + strlen(utsname.machine);
  54         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, "");
  55 }
  56
  57 static void seed_rng(void)
  58 {
  59         int fd;
  60         struct {
  61                 int entropy_count;
  62                 int buffer_size;
  63                 unsigned char buffer[256];
  64         } entropy = {
  65                 .entropy_count = sizeof(entropy.buffer) * 8,
  66                 .buffer_size = sizeof(entropy.buffer),
  67                 .buffer = "Adding real entropy is not actually important for these tests. Don't try this at home, kids!"
  68         };
  69
  70         if (mknod("/dev/urandom", S_IFCHR | 0644, makedev(1, 9)))
  71                 panic("mknod(/dev/urandom)");
  72         fd = open("/dev/urandom", O_WRONLY);
  73         if (fd < 0)
  74                 panic("open(urandom)");
  75         for (int i = 0; i < 256; ++i) {
  76                 if (ioctl(fd, RNDADDENTROPY, &entropy) < 0)
  77                         panic("ioctl(urandom)");
  78         }
  79         close(fd);
  80 }
  81
  82 static void mount_filesystems(void)
  83 {
  84         pretty_message("[+] Mounting filesystems...");
  85         mkdir("/dev", 0755);
  86         mkdir("/proc", 0755);
  87         mkdir("/sys", 0755);
  88         mkdir("/tmp", 0755);
  89         mkdir("/run", 0755);
  90         mkdir("/var", 0755);
  91         if (mount("none", "/dev", "devtmpfs", 0, NULL))
  92                 panic("devtmpfs mount");
  93         if (mount("none", "/proc", "proc", 0, NULL))
  94                 panic("procfs mount");
  95         if (mount("none", "/sys", "sysfs", 0, NULL))
  96                 panic("sysfs mount");
  97         if (mount("none", "/tmp", "tmpfs", 0, NULL))
  98                 panic("tmpfs mount");
  99         if (mount("none", "/run", "tmpfs", 0, NULL))
 100                 panic("tmpfs mount");
 101         if (mount("none", "/sys/kernel/debug", "debugfs", 0, NULL))
 102                 ; /* Not a problem if it fails.*/
 103         if (symlink("/run", "/var/run"))
 104                 panic("run symlink");
 105         if (symlink("/proc/self/fd", "/dev/fd"))
 106                 panic("fd symlink");
 107 }
 108
 109 static void enable_logging(void)
 110 {
 111         int fd;
 112         pretty_message("[+] Enabling logging...");
 113         fd = open("/proc/sys/kernel/printk", O_WRONLY);
 114         if (fd >= 0) {
 115                 if (write(fd, "9\n", 2) != 2)
 116                         panic("write(printk)");
 117                 close(fd);
 118         }
 119         fd = open("/proc/sys/debug/exception-trace", O_WRONLY);
 120         if (fd >= 0) {
 121                 if (write(fd, "1\n", 2) != 2)
 122                         panic("write(exception-trace)");
 123                 close(fd);
 124         }
 125         fd = open("/proc/sys/kernel/panic_on_warn", O_WRONLY);
 126         if (fd >= 0) {
 127                 if (write(fd, "1\n", 2) != 2)
 128                         panic("write(panic_on_warn)");
 129                 close(fd);
 130         }
 131 }
 132
 133 static void kmod_selftests(void)
 134 {
 135         FILE *file;
 136         char line[2048], *start, *pass;
 137         bool success = true;
 138         pretty_message("[+] Module self-tests:");
 139         file = fopen("/proc/kmsg", "r");
 140         if (!file)
 141                 panic("fopen(kmsg)");
 142         if (fcntl(fileno(file), F_SETFL, O_NONBLOCK) < 0)
 143                 panic("fcntl(kmsg, nonblock)");
 144         while (fgets(line, sizeof(line), file)) {
 145                 start = strstr(line, "wireguard: ");
 146                 if (!start)
 147                         continue;
 148                 start += 11;
 149                 *strchrnul(start, '\n') = '\0';
 150                 if (strstr(start, "www.wireguard.com"))
 151                         break;
 152                 pass = strstr(start, ": pass");
 153                 if (!pass || pass[6] != '\0') {
 154                         success = false;
 155                         printf(" \x1b[31m*  %s\x1b[0m\n", start);
 156                 } else
 157                         printf(" \x1b[32m*  %s\x1b[0m\n", start);
 158         }
 159         fclose(file);
 160         if (!success) {
 161                 puts("\x1b[31m\x1b[1m[-] Tests failed! \u2639\x1b[0m");
 162                 poweroff();
 163         }
 164 }
 165
 166 static void launch_tests(void)
 167 {
 168         char cmdline[4096], *success_dev;
 169         int status, fd;
 170         pid_t pid;
 171
 172         pretty_message("[+] Launching tests...");
 173         pid = fork();
 174         if (pid == -1)
 175                 panic("fork");
 176         else if (pid == 0) {
 177                 execl("/init.sh", "init", NULL);
 178                 panic("exec");
 179         }
 180         if (waitpid(pid, &status, 0) < 0)
 181                 panic("waitpid");
 182         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
 183                 pretty_message("[+] Tests successful! :-)");
 184                 fd = open("/proc/cmdline", O_RDONLY);
 185                 if (fd < 0)
 186                         panic("open(/proc/cmdline)");
 187                 if (read(fd, cmdline, sizeof(cmdline) - 1) <= 0)
 188                         panic("read(/proc/cmdline)");
 189                 cmdline[sizeof(cmdline) - 1] = '\0';
 190                 for (success_dev = strtok(cmdline, " \n"); success_dev; success_dev = strtok(NULL, " \n")) {
 191                         if (strncmp(success_dev, "wg.success=", 11))
 192                                 continue;
 193                         memcpy(success_dev + 11 - 5, "/dev/", 5);
 194                         success_dev += 11 - 5;
 195                         break;
 196                 }
 197                 if (!success_dev || !strlen(success_dev))
 198                         panic("Unable to find success device");
 199
 200                 fd = open(success_dev, O_WRONLY);
 201                 if (fd < 0)
 202                         panic("open(success_dev)");
 203                 if (write(fd, "success\n", 8) != 8)
 204                         panic("write(success_dev)");
 205                 close(fd);
 206         } else {
 207                 const char *why = "unknown cause";
 208                 int what = -1;
 209
 210                 if (WIFEXITED(status)) {
 211                         why = "exit code";
 212                         what = WEXITSTATUS(status);
 213                 } else if (WIFSIGNALED(status)) {
 214                         why = "signal";
 215                         what = WTERMSIG(status);
 216                 }
 217                 printf("\x1b[31m\x1b[1m[-] Tests failed with %s %d! \u2639\x1b[0m\n", why, what);
 218         }
 219 }
 220
 221 static void ensure_console(void)
 222 {
 223         for (unsigned int i = 0; i < 1000; ++i) {
 224                 int fd = open("/dev/console", O_RDWR);
 225                 if (fd < 0) {
 226                         usleep(50000);
 227                         continue;
 228                 }
 229                 dup2(fd, 0);
 230                 dup2(fd, 1);
 231                 dup2(fd, 2);
 232                 close(fd);
 233                 if (write(1, "\0\0\0\0\n", 5) == 5)
 234                         return;
 235         }
 236         panic("Unable to open console device");
 237 }
 238
 239 static void clear_leaks(void)
 240 {
 241         int fd;
 242
 243         fd = open("/sys/kernel/debug/kmemleak", O_WRONLY);
 244         if (fd < 0)
 245                 return;
 246         pretty_message("[+] Starting memory leak detection...");
 247         write(fd, "clear\n", 5);
 248         close(fd);
 249 }
 250
 251 static void check_leaks(void)
 252 {
 253         int fd;
 254
 255         fd = open("/sys/kernel/debug/kmemleak", O_WRONLY);
 256         if (fd < 0)
 257                 return;
 258         pretty_message("[+] Scanning for memory leaks...");
 259         sleep(2); /* Wait for any grace periods. */
 260         write(fd, "scan\n", 5);
 261         close(fd);
 262
 263         fd = open("/sys/kernel/debug/kmemleak", O_RDONLY);
 264         if (fd < 0)
 265                 return;
 266         if (sendfile(1, fd, NULL, 0x7ffff000) > 0)
 267                 panic("Memory leaks encountered");
 268         close(fd);
 269 }
 270
 271 int main(int argc, char *argv[])
 272 {
 273         seed_rng();
 274         ensure_console();
 275         print_banner();
 276         mount_filesystems();
 277         kmod_selftests();
 278         enable_logging();
 279         clear_leaks();
 280         launch_tests();
 281         check_leaks();
 282         poweroff();
 283         return 1;
 284 }