// https://syzkaller.appspot.com/bug?id=d313d8fc34c0c5caa6e4eefc05bcb75193e72e78
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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 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 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;
  const int umount_flags = MNT_FORCE | UMOUNT_NOFOLLOW;

retry:
  while (umount2(dir, umount_flags) == 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, umount_flags) == 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, umount_flags))
        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, umount_flags))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

static int inject_fault(int nth)
{
  int fd;
  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exit(1);
  char buf[16];
  sprintf(buf, "%d", nth);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

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");
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static const char* setup_fault()
{
  int fd = open("/proc/self/make-it-fail", O_WRONLY);
  if (fd == -1)
    return "CONFIG_FAULT_INJECTION is not enabled";
  close(fd);
  fd = open("/proc/thread-self/fail-nth", O_WRONLY);
  if (fd == -1)
    return "kernel does not have systematic fault injection support";
  close(fd);
  static struct {
    const char* file;
    const char* val;
    bool fatal;
  } files[] = {
      {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
      {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
  };
  unsigned i;
  for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].file, files[i].val)) {
      if (files[i].fatal)
        return "failed to write fault injection file";
    }
  }
  return NULL;
}

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 (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$cgroup_ro arguments: [
  //    fd: fd_cgroup (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {62 6c 6b 69 6f 2e 62 66 71 2e 69 6f 5f 77 61 69 74 5f 74 69
  //      6d 65 5f 72 65 63 75 72 73 69 76 65 00} (length 0x21)
  //    }
  //    flags: const = 0x275a (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x2000000001c0, "blkio.bfq.io_wait_time_recursive\000", 33);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x2000000001c0ul,
                /*flags=*/0x275a, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  socketpair$tipc arguments: [
  //    domain: const = 0x1e (8 bytes)
  //    type: tipc_socket_types = 0x5 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //    fds: ptr[out, tipc_pair] {
  //      tipc_pair {
  //        fd0: sock_tipc (resource)
  //        fd1: sock_tipc (resource)
  //      }
  //    }
  //  ]
  syscall(__NR_socketpair, /*domain=*/0x1eul, /*type=SOCK_SEQPACKET*/ 5ul,
          /*proto=*/0, /*fds=*/0x200000000040ul);
  //  write$binfmt_script arguments: [
  //    fd: fd_binfmt (resource)
  //    data: ptr[in, binfmt_script] {
  //      binfmt_script {
  //        hdr: buffer: {23 21 20} (length 0x3)
  //        bin: buffer: {} (length 0x0)
  //        args: array[binfmt_script_arg] {
  //        }
  //        nl: const = 0xa (1 bytes)
  //        data: buffer: {} (length 0x0)
  //      }
  //    }
  //    len: bytesize = 0x208e24b (8 bytes)
  //  ]
  memcpy((void*)0x200000000000, "#! ", 3);
  *(uint8_t*)0x200000000003 = 0xa;
  syscall(__NR_write, /*fd=*/r[0], /*data=*/0x200000000000ul,
          /*len=*/0x208e24bul);
  //  preadv arguments: [
  //    fd: fd (resource)
  //    vec: ptr[in, array[iovec[out, array[int8]]]] {
  //      array[iovec[out, array[int8]]] {
  //        iovec[out, array[int8]] {
  //          addr: ptr[out, buffer] {
  //            buffer: (DirOut)
  //          }
  //          len: len = 0xffffff23 (8 bytes)
  //        }
  //      }
  //    }
  //    vlen: len = 0x1 (8 bytes)
  //    off_low: int32 = 0x0 (4 bytes)
  //    off_high: int32 = 0x0 (4 bytes)
  //  ]
  *(uint64_t*)0x2000000015c0 = 0x200000000080;
  *(uint64_t*)0x2000000015c8 = 0xffffff23;
  syscall(__NR_preadv, /*fd=*/r[0], /*vec=*/0x2000000015c0ul, /*vlen=*/1ul,
          /*off_low=*/0, /*off_high=*/0);
  //  add_key$user arguments: [
  //    type: ptr[in, buffer] {
  //      buffer: {75 73 65 72 00} (length 0x5)
  //    }
  //    desc: ptr[in, key_desc] {
  //      key_desc {
  //        prefix: buffer: {73 79 7a} (length 0x3)
  //        id: proc = 0xffffffffffffffff (1 bytes)
  //        z: const = 0x0 (1 bytes)
  //      }
  //    }
  //    payload: ptr[in, buffer] {
  //      buffer: {} (length 0x0)
  //    }
  //    paylen: len = 0xc9 (8 bytes)
  //    keyring: keyring (resource)
  //  ]
  //  returns user_key
  memcpy((void*)0x2000000003c0, "user\000", 5);
  memcpy((void*)0x200000000440, "syz", 3);
  *(uint8_t*)0x200000000443 = 0;
  *(uint8_t*)0x200000000444 = 0;
  syscall(__NR_add_key, /*type=*/0x2000000003c0ul, /*desc=*/0x200000000440ul,
          /*payload=*/0x2000000000c0ul, /*paylen=*/0xc9ul,
          /*keyring=*/0xfffffffd);
  //  mkdirat arguments: [
  //    fd: fd_dir (resource)
  //    path: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
  //    }
  //    mode: open_mode = 0x1ff (8 bytes)
  //  ]
  memcpy((void*)0x200000000440, "./mnt\000", 6);
  syscall(
      __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000000440ul,
      /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
      0x1fful);
  //  mount arguments: [
  //    src: ptr[in, blockdev_filename] {
  //      union blockdev_filename {
  //        filename: buffer: {00} (length 0x1)
  //      }
  //    }
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {65 63 72 79 70 74 66 73 00} (length 0x9)
  //    }
  //    flags: mount_flags = 0x0 (8 bytes)
  //    data: ptr[in, buffer] {
  //      buffer: {65 63 72 79 70 74 66 73 5f 73 69 67 3d 73 79 7a 2c 65 63 72
  //      79 70 74 66 73 5f 66 6e 65 6b 5f 73 69 67 3d 73 79 7a 2c 65 63 72 79
  //      70 74 66 73 5f 63 69 70 68 65 72 3d 61 65 73 2c 65 63 72 79 70 74 66
  //      73 5f 6b 65 79 5f 62 79 74 65 73 3d 31 36 00} (length 0x51)
  //    }
  //  ]
  memset((void*)0x200000000400, 0, 1);
  memcpy((void*)0x200000000000, "./mnt\000", 6);
  memcpy((void*)0x200000000480, "ecryptfs\000", 9);
  memcpy((void*)0x200000000500,
         "ecryptfs_sig=syz,ecryptfs_fnek_sig=syz,ecryptfs_cipher=aes,ecryptfs_"
         "key_bytes=16\000",
         81);
  inject_fault(29);
  syscall(__NR_mount, /*src=*/0x200000000400ul, /*dst=*/0x200000000000ul,
          /*type=*/0x200000000480ul, /*flags=*/0ul, /*data=*/0x200000000500ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  if ((reason = setup_fault()))
    printf("the reproducer may not work as expected: fault injection setup "
           "failed: %s\n",
           reason);
  use_temporary_dir();
  loop();
  return 0;
}