// https://syzkaller.appspot.com/bug?id=7092911c52535a3189e8b425dfa70d23f1bbc53e
// 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 <setjmp.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/mount.h>
#include <sys/prctl.h>
#include <sys/resource.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/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.h>

unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

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 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);
  }
}

#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 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 = 160 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 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 do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  initialize_netdevices();
  loop();
  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();
}

#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++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      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;
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0};

void execute_one(void)
{
  long res = 0;
  res = syscall(__NR_socket, 0xa, 0x2100000000000002, 0);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint8_t*)0x200002c0 = 0xfe);
  NONFAILING(*(uint8_t*)0x200002c1 = 0x80);
  NONFAILING(*(uint8_t*)0x200002c2 = 0);
  NONFAILING(*(uint8_t*)0x200002c3 = 0);
  NONFAILING(*(uint8_t*)0x200002c4 = 0);
  NONFAILING(*(uint8_t*)0x200002c5 = 0);
  NONFAILING(*(uint8_t*)0x200002c6 = 0);
  NONFAILING(*(uint8_t*)0x200002c7 = 0);
  NONFAILING(*(uint8_t*)0x200002c8 = 0);
  NONFAILING(*(uint8_t*)0x200002c9 = 0);
  NONFAILING(*(uint8_t*)0x200002ca = 0);
  NONFAILING(*(uint8_t*)0x200002cb = 0);
  NONFAILING(*(uint8_t*)0x200002cc = 0);
  NONFAILING(*(uint8_t*)0x200002cd = 0);
  NONFAILING(*(uint8_t*)0x200002ce = 0);
  NONFAILING(*(uint8_t*)0x200002cf = 0xbb);
  NONFAILING(*(uint64_t*)0x200002d0 = htobe64(0));
  NONFAILING(*(uint64_t*)0x200002d8 = htobe64(1));
  NONFAILING(*(uint16_t*)0x200002e0 = htobe16(0));
  NONFAILING(*(uint16_t*)0x200002e2 = htobe16(0));
  NONFAILING(*(uint16_t*)0x200002e4 = htobe16(0));
  NONFAILING(*(uint16_t*)0x200002e6 = htobe16(0));
  NONFAILING(*(uint16_t*)0x200002e8 = 0xa);
  NONFAILING(*(uint8_t*)0x200002ea = 0);
  NONFAILING(*(uint8_t*)0x200002eb = 0);
  NONFAILING(*(uint8_t*)0x200002ec = 0);
  NONFAILING(*(uint32_t*)0x200002f0 = 0);
  NONFAILING(*(uint32_t*)0x200002f4 = 0);
  NONFAILING(*(uint64_t*)0x200002f8 = 0);
  NONFAILING(*(uint64_t*)0x20000300 = 0);
  NONFAILING(*(uint64_t*)0x20000308 = 0);
  NONFAILING(*(uint64_t*)0x20000310 = 0);
  NONFAILING(*(uint64_t*)0x20000318 = 0);
  NONFAILING(*(uint64_t*)0x20000320 = 0);
  NONFAILING(*(uint64_t*)0x20000328 = 0);
  NONFAILING(*(uint64_t*)0x20000330 = 0);
  NONFAILING(*(uint64_t*)0x20000338 = 0);
  NONFAILING(*(uint64_t*)0x20000340 = 0);
  NONFAILING(*(uint64_t*)0x20000348 = 0);
  NONFAILING(*(uint64_t*)0x20000350 = 0);
  NONFAILING(*(uint32_t*)0x20000358 = 0);
  NONFAILING(*(uint32_t*)0x2000035c = 0);
  NONFAILING(*(uint8_t*)0x20000360 = 1);
  NONFAILING(*(uint8_t*)0x20000361 = 0);
  NONFAILING(*(uint8_t*)0x20000362 = 0);
  NONFAILING(*(uint8_t*)0x20000363 = 0);
  NONFAILING(*(uint32_t*)0x20000368 = htobe32(0xe0000001));
  NONFAILING(*(uint32_t*)0x20000378 = htobe32(0));
  NONFAILING(*(uint8_t*)0x2000037c = 0x2b);
  NONFAILING(*(uint16_t*)0x20000380 = 0);
  NONFAILING(*(uint64_t*)0x20000384 = htobe64(0));
  NONFAILING(*(uint64_t*)0x2000038c = htobe64(1));
  NONFAILING(*(uint32_t*)0x20000394 = 0);
  NONFAILING(*(uint8_t*)0x20000398 = 0);
  NONFAILING(*(uint8_t*)0x20000399 = 0);
  NONFAILING(*(uint8_t*)0x2000039a = 0);
  NONFAILING(*(uint32_t*)0x2000039c = 0);
  NONFAILING(*(uint32_t*)0x200003a0 = 0);
  NONFAILING(*(uint32_t*)0x200003a4 = 0);
  syscall(__NR_setsockopt, r[0], 0x29, 0x23, 0x200002c0, 0xe8);
  NONFAILING(*(uint16_t*)0x20000100 = 0xa);
  NONFAILING(*(uint16_t*)0x20000102 = htobe16(0x4e20));
  NONFAILING(*(uint32_t*)0x20000104 = 0);
  NONFAILING(*(uint64_t*)0x20000108 = htobe64(0));
  NONFAILING(*(uint64_t*)0x20000110 = htobe64(1));
  NONFAILING(*(uint32_t*)0x20000118 = 0);
  syscall(__NR_sendto, r[0], 0x20000480, 0xfffffffffffffd94, 0, 0x20000100,
          0x1c);
  res = syscall(__NR_inotify_init1, 0);
  if (res != -1)
    r[1] = res;
  syscall(__NR_fcntl, r[1], 8, -1);
  res = syscall(__NR_fcntl, r[1], 0x10, 0x20000080);
  if (res != -1)
    NONFAILING(r[2] = *(uint32_t*)0x20000084);
  syscall(__NR_tgkill, r[2], r[2], 0xb);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}