// https://syzkaller.appspot.com/bug?id=e617dfba354312fdd7a74355d9ce30015c450e16
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

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;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

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);
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  int iter = 0;
  DIR* dp = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  struct dirent* ep = 0;
  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);
  for (int 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);
  for (int 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) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void setup_sysctl()
{
  char mypid[32];
  snprintf(mypid, sizeof(mypid), "%d", getpid());
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/net/ipv4/ping_group_range", "0 65535"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", mypid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data))
      printf("write to %s failed: %s\n", files[i].name, strerror(errno));
  }
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; 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();
      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 < 5000) {
        continue;
      }
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[10] = {0xffffffffffffffff,
                  0xffffffffffffffff,
                  0xffffffffffffffff,
                  0xffffffffffffffff,
                  0x0,
                  0xffffffffffffffff,
                  0xffffffffffffffff,
                  0x0,
                  0xffffffffffffffff,
                  0x0};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint64_t*)0x200001c0 = 0);
  NONFAILING(*(uint32_t*)0x200001c8 = 0);
  NONFAILING(*(uint64_t*)0x200001d0 = 0x20000540);
  NONFAILING(*(uint64_t*)0x20000540 = 0);
  NONFAILING(*(uint64_t*)0x20000548 = 0);
  NONFAILING(*(uint64_t*)0x200001d8 = 1);
  NONFAILING(*(uint64_t*)0x200001e0 = 0);
  NONFAILING(*(uint64_t*)0x200001e8 = 0);
  NONFAILING(*(uint32_t*)0x200001f0 = 0);
  syscall(__NR_sendmsg, r[1], 0x200001c0ul, 0ul);
  NONFAILING(*(uint32_t*)0x20000200 = 0x14);
  res = syscall(__NR_getsockname, r[1], 0x20000100ul, 0x20000200ul);
  if (res != -1)
    NONFAILING(r[2] = *(uint32_t*)0x20000104);
  NONFAILING(*(uint64_t*)0x200005c0 = 0);
  NONFAILING(*(uint32_t*)0x200005c8 = 0);
  NONFAILING(*(uint64_t*)0x200005d0 = 0x20000000);
  NONFAILING(*(uint64_t*)0x20000000 = 0x20000600);
  NONFAILING(memcpy((void*)0x20000600,
                    "\x3c\x00\x00\x00\x10\x00\x85\x46\x00\x00\x00\x00\x00\x00"
                    "\xff\x01\x00\x00\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x20000614 = r[2]);
  NONFAILING(memcpy(
      (void*)0x20000618,
      "\x01\x00\x00\x00\x00\x22\x00\x00\x1c\x00\x12\x00\x0c\x00\x01\x00\x62\x6f"
      "\x6e\x64\x00\x00\x00\x00\x0c\x00\x02\x00\x08\x00\x01\x00\x06\x14\xe1\x9e"
      "\x6e\x00\x7f\x09\xbf\x4c\xda\xac\xf5\xb8\xf2\xf9\xa2\x96\x57\x02\x5a\x8a"
      "\x04\xaf\xfb\x30\x36\xac\x17\x52\x28\xa5\x04\xc2\x43\xb0\xe2\xca\x3e\x45"
      "\x17\x47\xeb\x91\xeb\x32\xaf\xfe\xe4\x32\x95\x32\xef\xb1\xc9\x7d\xa0\xd0"
      "\xbf\x2b\xf2\x7a\x71\xaa\xa1\x17\xaf\x59\x0c\x4a\x8b\xb9\xba\xbf\x5c\xb4"
      "\x99\xe6\xf7\x5e\xba\x33\xe6\xba\xc2\x32\xe5\x34\x89\xd4\x36\xc0\xc4\xe4"
      "\x3b\x39\x1a\x42\x99\x12\xd1\xcc\xd8\x85\x07\xf6\x1e\x69\x34\xeb\x7d\x94"
      "\x73\x90",
      146));
  NONFAILING(*(uint64_t*)0x20000008 = 0x3c);
  NONFAILING(*(uint64_t*)0x200005d8 = 1);
  NONFAILING(*(uint64_t*)0x200005e0 = 0);
  NONFAILING(*(uint64_t*)0x200005e8 = 0);
  NONFAILING(*(uint32_t*)0x200005f0 = 0);
  syscall(__NR_sendmsg, r[0], 0x200005c0ul, 0ul);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[3] = res;
  NONFAILING(*(uint32_t*)0x200003c0 = 0x14);
  res = syscall(__NR_getsockname, r[1], 0x20000400ul, 0x200003c0ul);
  if (res != -1)
    NONFAILING(r[4] = *(uint32_t*)0x20000404);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[5] = res;
  res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
  if (res != -1)
    r[6] = res;
  NONFAILING(*(uint64_t*)0x200001c0 = 0);
  NONFAILING(*(uint32_t*)0x200001c8 = 0);
  NONFAILING(*(uint64_t*)0x200001d0 = 0x20000180);
  NONFAILING(*(uint64_t*)0x20000180 = 0);
  NONFAILING(*(uint64_t*)0x20000188 = 0x3d2);
  NONFAILING(*(uint64_t*)0x200001d8 = 1);
  NONFAILING(*(uint64_t*)0x200001e0 = 0);
  NONFAILING(*(uint64_t*)0x200001e8 = 0);
  NONFAILING(*(uint32_t*)0x200001f0 = 0);
  syscall(__NR_sendmsg, r[6], 0x200001c0ul, 0ul);
  NONFAILING(*(uint32_t*)0x200002c0 = 0x14);
  res = syscall(__NR_getsockname, r[6], 0x20000080ul, 0x200002c0ul);
  if (res != -1)
    NONFAILING(r[7] = *(uint32_t*)0x20000084);
  NONFAILING(*(uint64_t*)0x20000140 = 0);
  NONFAILING(*(uint32_t*)0x20000148 = 0);
  NONFAILING(*(uint64_t*)0x20000150 = 0x200006c0);
  NONFAILING(*(uint64_t*)0x200006c0 = 0x20000440);
  NONFAILING(memcpy((void*)0x20000440,
                    "\x34\x00\x00\x00\x10\x00\x01\x04\x00\x00\x00\x00\x00\x00"
                    "\xfc\xff\x00\x00\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x20000454 = r[7]);
  NONFAILING(memcpy((void*)0x20000458,
                    "\x01\x85\x02\x00\x00\x00\x00\x00\x14\x00\x12\x80\x0b\x00"
                    "\x01\x00\x62\x72\x69\x64\x67\x65\x00\x00\x04\x00\x02\x80",
                    28));
  NONFAILING(*(uint64_t*)0x200006c8 = 0x34);
  NONFAILING(*(uint64_t*)0x20000158 = 1);
  NONFAILING(*(uint64_t*)0x20000160 = 0);
  NONFAILING(*(uint64_t*)0x20000168 = 0);
  NONFAILING(*(uint32_t*)0x20000170 = 0);
  syscall(__NR_sendmsg, r[5], 0x20000140ul, 0ul);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[8] = res;
  NONFAILING(*(uint32_t*)0x20000280 = 0x14);
  res = syscall(__NR_getsockname, r[1], 0x20000100ul, 0x20000280ul);
  if (res != -1)
    NONFAILING(r[9] = *(uint32_t*)0x20000104);
  NONFAILING(*(uint64_t*)0x20000080 = 0);
  NONFAILING(*(uint32_t*)0x20000088 = 0);
  NONFAILING(*(uint64_t*)0x20000090 = 0x20000040);
  NONFAILING(*(uint64_t*)0x20000040 = 0x200000c0);
  NONFAILING(*(uint32_t*)0x200000c0 = 0x28);
  NONFAILING(*(uint16_t*)0x200000c4 = 0x10);
  NONFAILING(*(uint16_t*)0x200000c6 = 0x825);
  NONFAILING(*(uint32_t*)0x200000c8 = 0);
  NONFAILING(*(uint32_t*)0x200000cc = 0);
  NONFAILING(*(uint8_t*)0x200000d0 = 0x53);
  NONFAILING(*(uint8_t*)0x200000d1 = 0);
  NONFAILING(*(uint16_t*)0x200000d2 = 0);
  NONFAILING(*(uint32_t*)0x200000d4 = r[9]);
  NONFAILING(*(uint32_t*)0x200000d8 = 0);
  NONFAILING(*(uint32_t*)0x200000dc = 0);
  NONFAILING(*(uint16_t*)0x200000e0 = 8);
  NONFAILING(*(uint16_t*)0x200000e2 = 0xa);
  NONFAILING(*(uint8_t*)0x200000e4 = 0xf);
  NONFAILING(*(uint64_t*)0x20000048 = 0x28);
  NONFAILING(*(uint64_t*)0x20000098 = 1);
  NONFAILING(*(uint64_t*)0x200000a0 = 0);
  NONFAILING(*(uint64_t*)0x200000a8 = 0);
  NONFAILING(*(uint32_t*)0x200000b0 = 0);
  syscall(__NR_sendmsg, r[8], 0x20000080ul, 0ul);
  NONFAILING(*(uint64_t*)0x20000240 = 0);
  NONFAILING(*(uint32_t*)0x20000248 = 0);
  NONFAILING(*(uint64_t*)0x20000250 = 0x20000140);
  NONFAILING(*(uint64_t*)0x20000140 = 0x20000300);
  NONFAILING(*(uint32_t*)0x20000300 = 0x4c);
  NONFAILING(*(uint16_t*)0x20000304 = 0x10);
  NONFAILING(*(uint16_t*)0x20000306 = 0x401);
  NONFAILING(*(uint32_t*)0x20000308 = 0);
  NONFAILING(*(uint32_t*)0x2000030c = 0x25dfdbfe);
  NONFAILING(*(uint8_t*)0x20000310 = 0);
  NONFAILING(*(uint8_t*)0x20000311 = 0);
  NONFAILING(*(uint16_t*)0x20000312 = 0);
  NONFAILING(*(uint32_t*)0x20000314 = 0);
  NONFAILING(*(uint32_t*)0x20000318 = 0xebb50300);
  NONFAILING(*(uint32_t*)0x2000031c = 2);
  NONFAILING(*(uint16_t*)0x20000320 = 0x1c);
  NONFAILING(STORE_BY_BITMASK(uint16_t, , 0x20000322, 0x12, 0, 14));
  NONFAILING(STORE_BY_BITMASK(uint16_t, , 0x20000323, 0, 6, 1));
  NONFAILING(STORE_BY_BITMASK(uint16_t, , 0x20000323, 1, 7, 1));
  NONFAILING(*(uint16_t*)0x20000324 = 9);
  NONFAILING(*(uint16_t*)0x20000326 = 1);
  NONFAILING(memcpy((void*)0x20000328, "vlan\000", 5));
  NONFAILING(*(uint16_t*)0x20000330 = 0xc);
  NONFAILING(STORE_BY_BITMASK(uint16_t, , 0x20000332, 2, 0, 14));
  NONFAILING(STORE_BY_BITMASK(uint16_t, , 0x20000333, 0, 6, 1));
  NONFAILING(STORE_BY_BITMASK(uint16_t, , 0x20000333, 1, 7, 1));
  NONFAILING(*(uint16_t*)0x20000334 = 6);
  NONFAILING(*(uint16_t*)0x20000336 = 1);
  NONFAILING(*(uint16_t*)0x20000338 = 0);
  NONFAILING(*(uint16_t*)0x2000033c = 8);
  NONFAILING(*(uint16_t*)0x2000033e = 5);
  NONFAILING(*(uint32_t*)0x20000340 = r[7]);
  NONFAILING(*(uint16_t*)0x20000344 = 8);
  NONFAILING(*(uint16_t*)0x20000346 = 0xa);
  NONFAILING(*(uint32_t*)0x20000348 = r[4]);
  NONFAILING(*(uint64_t*)0x20000148 = 0x4c);
  NONFAILING(*(uint64_t*)0x20000258 = 1);
  NONFAILING(*(uint64_t*)0x20000260 = 0);
  NONFAILING(*(uint64_t*)0x20000268 = 0);
  NONFAILING(*(uint32_t*)0x20000270 = 0);
  syscall(__NR_sendmsg, r[3], 0x20000240ul, 0ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  setup_sysctl();
  install_segv_handler();
  use_temporary_dir();
  loop();
  return 0;
}