syzkaller-repros/linux/24572e21f2a469781d4da7bd8d830390543b2d5e.c

// general protection fault in __bfs
// https://syzkaller.appspot.com/bug?id=24572e21f2a469781d4da7bd8d830390543b2d5e
// status:dup
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if_arp.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/genetlink.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/netlink.h>
#include <linux/tcp.h>

unsigned long long procid;

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void vsnprintf_check(char* str, size_t size, const char* format,
                            va_list args)
{
  int rv;
  rv = vsnprintf(str, size, format, args);
  if (rv < 0)
    exit(1);
  if ((size_t)rv >= size)
    exit(1);
}

#define COMMAND_MAX_LEN 128
#define PATH_PREFIX                                                            \
  "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin "
#define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1)

static void execute_command(bool panic, const char* format, ...)
{
  va_list args;
  char command[PATH_PREFIX_LEN + COMMAND_MAX_LEN];
  int rv;
  va_start(args, format);
  memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN);
  vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args);
  va_end(args);
  rv = system(command);
  if (rv) {
    if (panic)
      exit(1);
  }
}

static int tunfd = -1;
static int tun_frags_enabled;
#define SYZ_TUN_MAX_PACKET_SIZE 1000

#define TUN_IFACE "syz_tun"

#define LOCAL_MAC "aa:aa:aa:aa:aa:aa"
#define REMOTE_MAC "aa:aa:aa:aa:aa:bb"

#define LOCAL_IPV4 "172.20.20.170"
#define REMOTE_IPV4 "172.20.20.187"

#define LOCAL_IPV6 "fe80::aa"
#define REMOTE_IPV6 "fe80::bb"

#define IFF_NAPI 0x0010
#define IFF_NAPI_FRAGS 0x0020

static void initialize_tun(void)
{
  tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
  if (tunfd == -1) {
    printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n");
    printf("otherwise fuzzing or reproducing might not work as intended\n");
    return;
  }
  const int kTunFd = 240;
  if (dup2(tunfd, kTunFd) < 0)
    exit(1);
  close(tunfd);
  tunfd = kTunFd;
  struct ifreq ifr;
  memset(&ifr, 0, sizeof(ifr));
  strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ);
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS;
  if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
    if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
      exit(1);
  }
  if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
    exit(1);
  tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;
  execute_command(0, "sysctl -w net.ipv6.conf.%s.accept_dad=0", TUN_IFACE);
  execute_command(0, "sysctl -w net.ipv6.conf.%s.router_solicitations=0",
                  TUN_IFACE);
  execute_command(1, "ip link set dev %s address %s", TUN_IFACE, LOCAL_MAC);
  execute_command(1, "ip addr add %s/24 dev %s", LOCAL_IPV4, TUN_IFACE);
  execute_command(1, "ip neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV4, REMOTE_MAC, TUN_IFACE);
  execute_command(0, "ip -6 addr add %s/120 dev %s", LOCAL_IPV6, TUN_IFACE);
  execute_command(0, "ip -6 neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV6, REMOTE_MAC, TUN_IFACE);
  execute_command(1, "ip link set dev %s up", TUN_IFACE);
}

#define DEV_IPV4 "172.20.20.%d"
#define DEV_IPV6 "fe80::%02hx"
#define DEV_MAC "aa:aa:aa:aa:aa:%02hx"

static void snprintf_check(char* str, size_t size, const char* format, ...)
{
  va_list args;
  va_start(args, format);
  vsnprintf_check(str, size, format, args);
  va_end(args);
}
static void initialize_netdevices(void)
{
  unsigned i;
  const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "team"};
  const char* devnames[] = {"lo",
                            "sit0",
                            "bridge0",
                            "vcan0",
                            "tunl0",
                            "gre0",
                            "gretap0",
                            "ip_vti0",
                            "ip6_vti0",
                            "ip6tnl0",
                            "ip6gre0",
                            "ip6gretap0",
                            "erspan0",
                            "bond0",
                            "veth0",
                            "veth1",
                            "team0",
                            "veth0_to_bridge",
                            "veth1_to_bridge",
                            "veth0_to_bond",
                            "veth1_to_bond",
                            "veth0_to_team",
                            "veth1_to_team"};
  const char* devmasters[] = {"bridge", "bond", "team"};
  for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++)
    execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]);
  execute_command(0, "ip link add type veth");
  for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
    execute_command(
        0, "ip link add name %s_slave_0 type veth peer name veth0_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(
        0, "ip link add name %s_slave_1 type veth peer name veth1_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(0, "ip link set %s_slave_0 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set %s_slave_1 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set veth0_to_%s up", devmasters[i]);
    execute_command(0, "ip link set veth1_to_%s up", devmasters[i]);
  }
  execute_command(0, "ip link set bridge_slave_0 up");
  execute_command(0, "ip link set bridge_slave_1 up");
  for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) {
    char addr[32];
    snprintf_check(addr, sizeof(addr), DEV_IPV4, i + 10);
    execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_IPV6, i + 10);
    execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_MAC, i + 10);
    execute_command(0, "ip link set dev %s address %s", devnames[i], addr);
    execute_command(0, "ip link set dev %s up", devnames[i]);
  }
}

static int read_tun(char* data, int size)
{
  if (tunfd < 0)
    return -1;
  int rv = read(tunfd, data, size);
  if (rv < 0) {
    if (errno == EAGAIN)
      return -1;
    if (errno == EBADFD)
      return -1;
    exit(1);
  }
  return rv;
}

static void flush_tun()
{
  char data[SYZ_TUN_MAX_PACKET_SIZE];
  while (read_tun(&data[0], sizeof(data)) != -1) {
  }
}

static long syz_genetlink_get_family_id(long name)
{
  char buf[512] = {0};
  struct nlmsghdr* hdr = (struct nlmsghdr*)buf;
  struct genlmsghdr* genlhdr = (struct genlmsghdr*)NLMSG_DATA(hdr);
  struct nlattr* attr = (struct nlattr*)(genlhdr + 1);
  hdr->nlmsg_len =
      sizeof(*hdr) + sizeof(*genlhdr) + sizeof(*attr) + GENL_NAMSIZ;
  hdr->nlmsg_type = GENL_ID_CTRL;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
  genlhdr->cmd = CTRL_CMD_GETFAMILY;
  attr->nla_type = CTRL_ATTR_FAMILY_NAME;
  attr->nla_len = sizeof(*attr) + GENL_NAMSIZ;
  strncpy((char*)(attr + 1), (char*)name, GENL_NAMSIZ);
  struct iovec iov = {hdr, hdr->nlmsg_len};
  struct sockaddr_nl addr = {0};
  addr.nl_family = AF_NETLINK;
  int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (fd == -1) {
    return -1;
  }
  struct msghdr msg = {&addr, sizeof(addr), &iov, 1, NULL, 0, 0};
  if (sendmsg(fd, &msg, 0) == -1) {
    close(fd);
    return -1;
  }
  ssize_t n = recv(fd, buf, sizeof(buf), 0);
  close(fd);
  if (n <= 0) {
    return -1;
  }
  if (hdr->nlmsg_type != GENL_ID_CTRL) {
    return -1;
  }
  for (; (char*)attr < buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID)
      return *(uint16_t*)(attr + 1);
  }
  return -1;
}

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

static void setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 200 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static int real_uid;
static int real_gid;
__attribute__((aligned(64 << 10))) static char sandbox_stack[1 << 20];

static int namespace_sandbox_proc(void* arg)
{
  sandbox_common();
  write_file("/proc/self/setgroups", "deny");
  if (!write_file("/proc/self/uid_map", "0 %d 1\n", real_uid))
    exit(1);
  if (!write_file("/proc/self/gid_map", "0 %d 1\n", real_gid))
    exit(1);
  if (unshare(CLONE_NEWNET))
    exit(1);
  initialize_tun();
  initialize_netdevices();
  if (mkdir("./syz-tmp", 0777))
    exit(1);
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot", 0777))
    exit(1);
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    exit(1);
  unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    exit(1);
  if (mount(NULL, "./syz-tmp/newroot/proc", "proc", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    exit(1);
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) {
    if (errno != ENOENT)
      exit(1);
    if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) &&
        errno != ENOENT)
      exit(1);
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    exit(1);
  if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/pivot", 0777))
    exit(1);
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      exit(1);
  } else {
    if (chdir("/"))
      exit(1);
    if (umount2("./pivot", MNT_DETACH))
      exit(1);
  }
  if (chroot("./newroot"))
    exit(1);
  if (chdir("/"))
    exit(1);
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  cap_data[0].effective &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].permitted &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].inheritable &= ~(1 << CAP_SYS_PTRACE);
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
  loop();
  exit(1);
}

#define SYZ_HAVE_SANDBOX_NAMESPACE 1
static int do_sandbox_namespace(void)
{
  int pid;
  setup_common();
  real_uid = getuid();
  real_gid = getgid();
  mprotect(sandbox_stack, 4096, PROT_NONE);
  pid =
      clone(namespace_sandbox_proc, &sandbox_stack[sizeof(sandbox_stack) - 64],
            CLONE_NEWUSER | CLONE_NEWPID, 0);
  return wait_for_loop(pid);
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    while (umount2(filename, MNT_DETACH) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
            close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
      if (umount2(filename, MNT_DETACH))
        exit(1);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
            close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

#define SYZ_HAVE_SETUP_TEST 1
static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  flush_tun();
}

#define SYZ_HAVE_RESET_TEST 1
static void reset_test()
{
  int fd;
  for (fd = 3; fd < 30; fd++)
    close(fd);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      setup_test();
      execute_one();
      reset_test();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_sendmsg
#define __NR_sendmsg 370
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

uint64_t r[2] = {0xffffffffffffffff, 0x0};

void execute_one(void)
{
  long res = 0;
  res = syscall(__NR_socket, 0x10, 3, 0x10);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20001ac0, "TIPCv2", 7);
  res = syz_genetlink_get_family_id(0x20001ac0);
  if (res != -1)
    r[1] = res;
  *(uint32_t*)0x20001e40 = 0;
  *(uint32_t*)0x20001e44 = 0;
  *(uint32_t*)0x20001e48 = 0x20001e00;
  *(uint32_t*)0x20001e00 = 0x20001b00;
  *(uint32_t*)0x20001b00 = 0x2cc;
  *(uint16_t*)0x20001b04 = r[1];
  *(uint16_t*)0x20001b06 = 1;
  *(uint32_t*)0x20001b08 = 0x70bd2b;
  *(uint32_t*)0x20001b0c = 0x25dfdbfd;
  *(uint8_t*)0x20001b10 = 3;
  *(uint8_t*)0x20001b11 = 0;
  *(uint16_t*)0x20001b12 = 0;
  *(uint16_t*)0x20001b14 = 0x70;
  *(uint16_t*)0x20001b16 = 1;
  *(uint16_t*)0x20001b18 = 0x2c;
  *(uint16_t*)0x20001b1a = 4;
  *(uint16_t*)0x20001b1c = 0x14;
  *(uint16_t*)0x20001b1e = 1;
  *(uint16_t*)0x20001b20 = 2;
  *(uint16_t*)0x20001b22 = htobe16(0x4e24);
  *(uint8_t*)0x20001b24 = 0xac;
  *(uint8_t*)0x20001b25 = 0x14;
  *(uint8_t*)0x20001b26 = 0x14;
  *(uint8_t*)0x20001b27 = 0x20;
  *(uint16_t*)0x20001b30 = 0x14;
  *(uint16_t*)0x20001b32 = 2;
  *(uint16_t*)0x20001b34 = 2;
  *(uint16_t*)0x20001b36 = htobe16(0x4e21);
  *(uint32_t*)0x20001b38 = htobe32(0);
  *(uint16_t*)0x20001b44 = 0x2c;
  *(uint16_t*)0x20001b46 = 2;
  *(uint16_t*)0x20001b48 = 8;
  *(uint16_t*)0x20001b4a = 4;
  *(uint32_t*)0x20001b4c = 1;
  *(uint16_t*)0x20001b50 = 8;
  *(uint16_t*)0x20001b52 = 4;
  *(uint32_t*)0x20001b54 = 3;
  *(uint16_t*)0x20001b58 = 8;
  *(uint16_t*)0x20001b5a = 2;
  *(uint32_t*)0x20001b5c = 0;
  *(uint16_t*)0x20001b60 = 8;
  *(uint16_t*)0x20001b62 = 1;
  *(uint32_t*)0x20001b64 = 7;
  *(uint16_t*)0x20001b68 = 8;
  *(uint16_t*)0x20001b6a = 2;
  *(uint32_t*)0x20001b6c = 0xbc4;
  *(uint16_t*)0x20001b70 = 0x10;
  *(uint16_t*)0x20001b72 = 1;
  memcpy((void*)0x20001b74, "udp:syz1", 9);
  *(uint16_t*)0x20001b80 = 4;
  *(uint16_t*)0x20001b82 = 2;
  *(uint16_t*)0x20001b84 = 0x24;
  *(uint16_t*)0x20001b86 = 9;
  *(uint16_t*)0x20001b88 = 8;
  *(uint16_t*)0x20001b8a = 2;
  *(uint32_t*)0x20001b8c = 0x7fff;
  *(uint16_t*)0x20001b90 = 8;
  *(uint16_t*)0x20001b92 = 2;
  *(uint32_t*)0x20001b94 = 4;
  *(uint16_t*)0x20001b98 = 8;
  *(uint16_t*)0x20001b9a = 1;
  *(uint32_t*)0x20001b9c = 0xfffffff7;
  *(uint16_t*)0x20001ba0 = 8;
  *(uint16_t*)0x20001ba2 = 1;
  *(uint32_t*)0x20001ba4 = 0x7ff;
  *(uint16_t*)0x20001ba8 = 0x48;
  *(uint16_t*)0x20001baa = 7;
  *(uint16_t*)0x20001bac = 8;
  *(uint16_t*)0x20001bae = 2;
  *(uint32_t*)0x20001bb0 = 1;
  *(uint16_t*)0x20001bb4 = 8;
  *(uint16_t*)0x20001bb6 = 1;
  *(uint32_t*)0x20001bb8 = 0x800;
  *(uint16_t*)0x20001bbc = 0xc;
  *(uint16_t*)0x20001bbe = 4;
  *(uint64_t*)0x20001bc0 = 1;
  *(uint16_t*)0x20001bc8 = 0xc;
  *(uint16_t*)0x20001bca = 3;
  *(uint64_t*)0x20001bcc = 0x1ff;
  *(uint16_t*)0x20001bd4 = 0xc;
  *(uint16_t*)0x20001bd6 = 4;
  *(uint64_t*)0x20001bd8 = 3;
  *(uint16_t*)0x20001be0 = 8;
  *(uint16_t*)0x20001be2 = 1;
  *(uint32_t*)0x20001be4 = 3;
  *(uint16_t*)0x20001be8 = 8;
  *(uint16_t*)0x20001bea = 2;
  *(uint32_t*)0x20001bec = 0xa1;
  *(uint16_t*)0x20001bf0 = 0xdc;
  *(uint16_t*)0x20001bf2 = 4;
  *(uint16_t*)0x20001bf4 = 0x2c;
  *(uint16_t*)0x20001bf6 = 7;
  *(uint16_t*)0x20001bf8 = 8;
  *(uint16_t*)0x20001bfa = 1;
  *(uint32_t*)0x20001bfc = 7;
  *(uint16_t*)0x20001c00 = 8;
  *(uint16_t*)0x20001c02 = 1;
  *(uint32_t*)0x20001c04 = 9;
  *(uint16_t*)0x20001c08 = 8;
  *(uint16_t*)0x20001c0a = 1;
  *(uint32_t*)0x20001c0c = 0x12;
  *(uint16_t*)0x20001c10 = 8;
  *(uint16_t*)0x20001c12 = 4;
  *(uint32_t*)0x20001c14 = 5;
  *(uint16_t*)0x20001c18 = 8;
  *(uint16_t*)0x20001c1a = 2;
  *(uint32_t*)0x20001c1c = 6;
  *(uint16_t*)0x20001c20 = 4;
  *(uint16_t*)0x20001c22 = 7;
  *(uint16_t*)0x20001c24 = 0xc;
  *(uint16_t*)0x20001c26 = 1;
  memcpy((void*)0x20001c28, "syz0", 5);
  *(uint16_t*)0x20001c30 = 0x3c;
  *(uint16_t*)0x20001c32 = 7;
  *(uint16_t*)0x20001c34 = 8;
  *(uint16_t*)0x20001c36 = 1;
  *(uint32_t*)0x20001c38 = 0x12;
  *(uint16_t*)0x20001c3c = 8;
  *(uint16_t*)0x20001c3e = 1;
  *(uint32_t*)0x20001c40 = 3;
  *(uint16_t*)0x20001c44 = 8;
  *(uint16_t*)0x20001c46 = 2;
  *(uint32_t*)0x20001c48 = 0x60e;
  *(uint16_t*)0x20001c4c = 8;
  *(uint16_t*)0x20001c4e = 1;
  *(uint32_t*)0x20001c50 = 2;
  *(uint16_t*)0x20001c54 = 8;
  *(uint16_t*)0x20001c56 = 3;
  *(uint32_t*)0x20001c58 = 0;
  *(uint16_t*)0x20001c5c = 8;
  *(uint16_t*)0x20001c5e = 2;
  *(uint32_t*)0x20001c60 = 1;
  *(uint16_t*)0x20001c64 = 8;
  *(uint16_t*)0x20001c66 = 1;
  *(uint32_t*)0x20001c68 = 0x14;
  *(uint16_t*)0x20001c6c = 0x34;
  *(uint16_t*)0x20001c6e = 7;
  *(uint16_t*)0x20001c70 = 8;
  *(uint16_t*)0x20001c72 = 4;
  *(uint32_t*)0x20001c74 = 0x8001;
  *(uint16_t*)0x20001c78 = 8;
  *(uint16_t*)0x20001c7a = 1;
  *(uint32_t*)0x20001c7c = 0x10;
  *(uint16_t*)0x20001c80 = 8;
  *(uint16_t*)0x20001c82 = 3;
  *(uint32_t*)0x20001c84 = 7;
  *(uint16_t*)0x20001c88 = 8;
  *(uint16_t*)0x20001c8a = 1;
  *(uint32_t*)0x20001c8c = 0x18;
  *(uint16_t*)0x20001c90 = 8;
  *(uint16_t*)0x20001c92 = 1;
  *(uint32_t*)0x20001c94 = 0xf;
  *(uint16_t*)0x20001c98 = 8;
  *(uint16_t*)0x20001c9a = 2;
  *(uint32_t*)0x20001c9c = 0x97;
  *(uint16_t*)0x20001ca0 = 0xc;
  *(uint16_t*)0x20001ca2 = 1;
  memcpy((void*)0x20001ca4, "syz0", 5);
  *(uint16_t*)0x20001cac = 0xc;
  *(uint16_t*)0x20001cae = 1;
  memcpy((void*)0x20001cb0, "syz1", 5);
  *(uint16_t*)0x20001cb8 = 0x14;
  *(uint16_t*)0x20001cba = 1;
  memcpy((void*)0x20001cbc, "broadcast-link", 15);
  *(uint16_t*)0x20001ccc = 0x24;
  *(uint16_t*)0x20001cce = 9;
  *(uint16_t*)0x20001cd0 = 8;
  *(uint16_t*)0x20001cd2 = 2;
  *(uint32_t*)0x20001cd4 = 0;
  *(uint16_t*)0x20001cd8 = 8;
  *(uint16_t*)0x20001cda = 1;
  *(uint32_t*)0x20001cdc = 6;
  *(uint16_t*)0x20001ce0 = 8;
  *(uint16_t*)0x20001ce2 = 1;
  *(uint32_t*)0x20001ce4 = 0x9ea;
  *(uint16_t*)0x20001ce8 = 8;
  *(uint16_t*)0x20001cea = 2;
  *(uint32_t*)0x20001cec = 6;
  *(uint16_t*)0x20001cf0 = 0x20;
  *(uint16_t*)0x20001cf2 = 5;
  *(uint16_t*)0x20001cf4 = 8;
  *(uint16_t*)0x20001cf6 = 1;
  memcpy((void*)0x20001cf8, "eth", 4);
  *(uint16_t*)0x20001cfc = 0x14;
  *(uint16_t*)0x20001cfe = 2;
  *(uint16_t*)0x20001d00 = 8;
  *(uint16_t*)0x20001d02 = 3;
  *(uint32_t*)0x20001d04 = 0x5e0d9dba;
  *(uint16_t*)0x20001d08 = 8;
  *(uint16_t*)0x20001d0a = 2;
  *(uint32_t*)0x20001d0c = 5;
  *(uint16_t*)0x20001d10 = 0xa0;
  *(uint16_t*)0x20001d12 = 5;
  *(uint16_t*)0x20001d14 = 0x1c;
  *(uint16_t*)0x20001d16 = 2;
  *(uint16_t*)0x20001d18 = 8;
  *(uint16_t*)0x20001d1a = 3;
  *(uint32_t*)0x20001d1c = 0x1000;
  *(uint16_t*)0x20001d20 = 8;
  *(uint16_t*)0x20001d22 = 2;
  *(uint32_t*)0x20001d24 = 8;
  *(uint16_t*)0x20001d28 = 8;
  *(uint16_t*)0x20001d2a = 2;
  *(uint32_t*)0x20001d2c = 0x8000;
  *(uint16_t*)0x20001d30 = 8;
  *(uint16_t*)0x20001d32 = 1;
  memcpy((void*)0x20001d34, "ib", 3);
  *(uint16_t*)0x20001d38 = 0x24;
  *(uint16_t*)0x20001d3a = 2;
  *(uint16_t*)0x20001d3c = 8;
  *(uint16_t*)0x20001d3e = 1;
  *(uint32_t*)0x20001d40 = 0xb;
  *(uint16_t*)0x20001d44 = 8;
  *(uint16_t*)0x20001d46 = 1;
  *(uint32_t*)0x20001d48 = 0x1d;
  *(uint16_t*)0x20001d4c = 8;
  *(uint16_t*)0x20001d4e = 3;
  *(uint32_t*)0x20001d50 = 1;
  *(uint16_t*)0x20001d54 = 8;
  *(uint16_t*)0x20001d56 = 1;
  *(uint32_t*)0x20001d58 = 0x20;
  *(uint16_t*)0x20001d5c = 8;
  *(uint16_t*)0x20001d5e = 1;
  memcpy((void*)0x20001d60, "ib", 3);
  *(uint16_t*)0x20001d64 = 0x14;
  *(uint16_t*)0x20001d66 = 2;
  *(uint16_t*)0x20001d68 = 8;
  *(uint16_t*)0x20001d6a = 3;
  *(uint32_t*)0x20001d6c = 0xfffffdfc;
  *(uint16_t*)0x20001d70 = 8;
  *(uint16_t*)0x20001d72 = 4;
  *(uint32_t*)0x20001d74 = 0xe8;
  *(uint16_t*)0x20001d78 = 0x1c;
  *(uint16_t*)0x20001d7a = 2;
  *(uint16_t*)0x20001d7c = 8;
  *(uint16_t*)0x20001d7e = 1;
  *(uint32_t*)0x20001d80 = 9;
  *(uint16_t*)0x20001d84 = 8;
  *(uint16_t*)0x20001d86 = 4;
  *(uint32_t*)0x20001d88 = 0x53;
  *(uint16_t*)0x20001d8c = 8;
  *(uint16_t*)0x20001d8e = 1;
  *(uint32_t*)0x20001d90 = 0xb;
  *(uint16_t*)0x20001d94 = 0x14;
  *(uint16_t*)0x20001d96 = 2;
  *(uint16_t*)0x20001d98 = 8;
  *(uint16_t*)0x20001d9a = 2;
  *(uint32_t*)0x20001d9c = 2;
  *(uint16_t*)0x20001da0 = 8;
  *(uint16_t*)0x20001da2 = 4;
  *(uint32_t*)0x20001da4 = 1;
  *(uint16_t*)0x20001da8 = 8;
  *(uint16_t*)0x20001daa = 1;
  memcpy((void*)0x20001dac, "eth", 4);
  *(uint16_t*)0x20001db0 = 0x1c;
  *(uint16_t*)0x20001db2 = 7;
  *(uint16_t*)0x20001db4 = 0xc;
  *(uint16_t*)0x20001db6 = 4;
  *(uint64_t*)0x20001db8 = 0xb686;
  *(uint16_t*)0x20001dc0 = 0xc;
  *(uint16_t*)0x20001dc2 = 4;
  *(uint64_t*)0x20001dc4 = 9;
  *(uint32_t*)0x20001e04 = 0x2cc;
  *(uint32_t*)0x20001e4c = 1;
  *(uint32_t*)0x20001e50 = 0;
  *(uint32_t*)0x20001e54 = 0;
  *(uint32_t*)0x20001e58 = 0x4000;
  syscall(__NR_sendmsg, (long)r[0], 0x20001e40, 0x80);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_namespace();
    }
  }
  sleep(1000000);
  return 0;
}