// https://syzkaller.appspot.com/bug?id=6eea1643991c65d0b6e48335439cca795de4592d
// 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 <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/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/genetlink.h>
#include <linux/netlink.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 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 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;
  NONFAILING(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;
}

#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();
}

#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);
  }
}

uint64_t r[1] = {0x0};

void execute_one(void)
{
  long res = 0;
  NONFAILING(*(uint32_t*)0x2001d000 = 1);
  NONFAILING(*(uint32_t*)0x2001d004 = 0x70);
  NONFAILING(*(uint8_t*)0x2001d008 = 0);
  NONFAILING(*(uint8_t*)0x2001d009 = 0);
  NONFAILING(*(uint8_t*)0x2001d00a = 0);
  NONFAILING(*(uint8_t*)0x2001d00b = 0);
  NONFAILING(*(uint32_t*)0x2001d00c = 0);
  NONFAILING(*(uint64_t*)0x2001d010 = 0x7f);
  NONFAILING(*(uint64_t*)0x2001d018 = 0);
  NONFAILING(*(uint64_t*)0x2001d020 = 0);
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 0, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 1, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 2, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 3, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 4, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 5, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 6, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 7, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 8, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 9, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 10, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 11, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 12, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 13, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 14, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 15, 2));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 17, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 18, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 19, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 20, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 21, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 22, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 23, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 24, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 25, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 26, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 27, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 28, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 29, 35));
  NONFAILING(*(uint32_t*)0x2001d030 = 0);
  NONFAILING(*(uint32_t*)0x2001d034 = 0);
  NONFAILING(*(uint64_t*)0x2001d038 = 0);
  NONFAILING(*(uint64_t*)0x2001d040 = 0);
  NONFAILING(*(uint64_t*)0x2001d048 = 0);
  NONFAILING(*(uint64_t*)0x2001d050 = 0);
  NONFAILING(*(uint32_t*)0x2001d058 = 0);
  NONFAILING(*(uint32_t*)0x2001d05c = 0);
  NONFAILING(*(uint64_t*)0x2001d060 = 0);
  NONFAILING(*(uint32_t*)0x2001d068 = 0);
  NONFAILING(*(uint16_t*)0x2001d06c = 0);
  NONFAILING(*(uint16_t*)0x2001d06e = 0);
  syscall(__NR_perf_event_open, 0x2001d000, 0, -1, -1, 0);
  NONFAILING(*(uint64_t*)0x20000140 = 3);
  NONFAILING(*(uint32_t*)0x20000148 = 8);
  NONFAILING(*(uint32_t*)0x2000014c = 0);
  NONFAILING(*(uint32_t*)0x20000150 = -1);
  NONFAILING(*(uint32_t*)0x20000154 = 0);
  syscall(__NR_ioctl, -1, 0xc0184900, 0x20000140);
  syz_genetlink_get_family_id(0);
  syscall(__NR_bind, -1, 0, 0);
  syz_genetlink_get_family_id(0);
  syscall(__NR_poll, 0x200004c0, 0, 7);
  syscall(__NR_sendmsg, -1, 0, 0x20004000);
  res = syscall(__NR_clock_gettime, 0, 0x20000100);
  if (res != -1)
    NONFAILING(r[0] = *(uint64_t*)0x20000108);
  syz_genetlink_get_family_id(0);
  NONFAILING(*(uint32_t*)0x20000000 = -1);
  NONFAILING(*(uint16_t*)0x20000004 = 0x41a);
  NONFAILING(*(uint16_t*)0x20000006 = 0);
  NONFAILING(*(uint64_t*)0x20000200 = 0);
  NONFAILING(*(uint64_t*)0x20000208 = r[0] + 30000000);
  syscall(__NR_ppoll, 0x20000000, 1, 0x20000200, 0, 0);
  syscall(__NR_getpeername, -1, 0, 0);
  NONFAILING(*(uint32_t*)0x20000680 = 0);
  NONFAILING(*(uint32_t*)0x20000684 = htobe32(0xe0000001));
  NONFAILING(*(uint32_t*)0x20000688 = htobe32(0x7f000001));
  syscall(__NR_setsockopt, -1, 0, 8, 0x20000680, 0xc);
  syscall(__NR_connect, -1, 0, 0);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
    }
  }
  sleep(1000000);
  return 0;
}