// https://syzkaller.appspot.com/bug?id=ad78db824bded69de3c0ad2bee363b499ceb233d
// 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>

#ifndef __NR_pwritev2
#define __NR_pwritev2 328
#endif

static unsigned long long procid;

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  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);
}

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 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 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[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
  //    }
  //    flags: open_flags = 0x40042 (4 bytes)
  //    mode: open_mode = 0x21 (2 bytes)
  //  ]
  //  returns fd
  NONFAILING(memcpy((void*)0x200000000080, "./file0\000", 8));
  syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000080ul,
          /*flags=O_NOATIME|O_CREAT|O_RDWR*/ 0x40042,
          /*mode=S_IXOTH|S_IRGRP*/ 0x21);
  //  pipe2$9p arguments: [
  //    pipefd: ptr[out, pipe_9p] {
  //      pipe_9p {
  //        rfd: rfd9p (resource)
  //        wfd: wfd9p (resource)
  //      }
  //    }
  //    flags: pipe_flags = 0x0 (8 bytes)
  //  ]
  res = syscall(__NR_pipe2, /*pipefd=*/0x2000000001c0ul, /*flags=*/0ul);
  if (res != -1) {
    NONFAILING(r[0] = *(uint32_t*)0x2000000001c0);
    NONFAILING(r[1] = *(uint32_t*)0x2000000001c4);
  }
  //  write$P9_RVERSION arguments: [
  //    fd: wfd9p (resource)
  //    data: ptr[inout, array[ANYUNION]] {
  //      array[ANYUNION] {
  //        union ANYUNION {
  //          ANYBLOB: buffer: {15 00 00 00 65 ff ff 04 80 00 00 08 00 39 50 32
  //          30 30 30} (length 0x13)
  //        }
  //      }
  //    }
  //    size: bytesize = 0x15 (8 bytes)
  //  ]
  NONFAILING(memcpy((void*)0x200000000500,
                    "\x15\x00\x00\x00\x65\xff\xff\x04\x80\x00\x00\x08\x00\x39"
                    "\x50\x32\x30\x30\x30",
                    19));
  syscall(__NR_write, /*fd=*/r[1], /*data=*/0x200000000500ul, /*size=*/0x15ul);
  //  dup arguments: [
  //    oldfd: fd (resource)
  //  ]
  //  returns fd
  res = syscall(__NR_dup, /*oldfd=*/r[1]);
  if (res != -1)
    r[2] = res;
  //  write$FUSE_BMAP arguments: [
  //    fd: fd_fuse (resource)
  //    arg: ptr[in, fuse_out_t[fuse_unique, fuse_bmap_out]] {
  //      fuse_out_t[fuse_unique, fuse_bmap_out] {
  //        len: len = 0x18 (4 bytes)
  //        err: fuse_errors = 0x0 (4 bytes)
  //        unique: fuse_unique (resource)
  //        payload: fuse_bmap_out {
  //          block: int64 = 0x0 (8 bytes)
  //        }
  //      }
  //    }
  //    len: bytesize = 0x18 (8 bytes)
  //  ]
  NONFAILING(*(uint32_t*)0x200000000100 = 0x18);
  NONFAILING(*(uint32_t*)0x200000000104 = 0);
  NONFAILING(*(uint64_t*)0x200000000108 = 0);
  NONFAILING(*(uint64_t*)0x200000000110 = 0);
  syscall(__NR_write, /*fd=*/r[2], /*arg=*/0x200000000100ul, /*len=*/0x18ul);
  //  write$FUSE_NOTIFY_RETRIEVE arguments: [
  //    fd: fd_fuse (resource)
  //    arg: ptr[in, fuse_notify[FUSE_NOTIFY_RETRIEVE,
  //    fuse_notify_retrieve_out]] {
  //      fuse_notify[FUSE_NOTIFY_RETRIEVE, fuse_notify_retrieve_out] {
  //        len: len = 0x14c (4 bytes)
  //        err: const = 0x5 (4 bytes)
  //        unique: const = 0x0 (8 bytes)
  //        payload: fuse_notify_retrieve_out {
  //          notify_unique: const = 0x0 (8 bytes)
  //          nodeid: int64 = 0x0 (8 bytes)
  //          offset: int64 = 0x0 (8 bytes)
  //          size: int32 = 0x0 (4 bytes)
  //          padding: const = 0x0 (4 bytes)
  //        }
  //      }
  //    }
  //    len: bytesize = 0x137 (8 bytes)
  //  ]
  NONFAILING(*(uint32_t*)0x2000000000c0 = 0x14c);
  NONFAILING(*(uint32_t*)0x2000000000c4 = 5);
  NONFAILING(*(uint64_t*)0x2000000000c8 = 0);
  NONFAILING(*(uint64_t*)0x2000000000d0 = 0);
  NONFAILING(*(uint64_t*)0x2000000000d8 = 0);
  NONFAILING(*(uint64_t*)0x2000000000e0 = 0);
  NONFAILING(*(uint32_t*)0x2000000000e8 = 0);
  NONFAILING(*(uint32_t*)0x2000000000ec = 0);
  syscall(__NR_write, /*fd=*/r[2], /*arg=*/0x2000000000c0ul, /*len=*/0x137ul);
  //  mount$9p_fd arguments: [
  //    src: const = 0x0 (8 bytes)
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {39 70 00} (length 0x3)
  //    }
  //    flags: mount_flags = 0x0 (8 bytes)
  //    opts: ptr[in, p9_options_fd] {
  //      p9_options_fd {
  //        trans: buffer: {74 72 61 6e 73 3d 66 64 2c} (length 0x9)
  //        rfdno: fs_opt["rfdno", fmt[hex, rfd9p]] {
  //          name: buffer: {72 66 64 6e 6f} (length 0x5)
  //          eq: const = 0x3d (1 bytes)
  //          val: rfd9p (resource)
  //        }
  //        comma0: const = 0x2c (1 bytes)
  //        wfdno: fs_opt["wfdno", fmt[hex, fd]] {
  //          name: buffer: {77 66 64 6e 6f} (length 0x5)
  //          eq: const = 0x3d (1 bytes)
  //          val: fd (resource)
  //        }
  //        comma1: const = 0x2c (1 bytes)
  //        opts: fs_options[p9_options] {
  //          elems: array[fs_opt_elem[p9_options]] {
  //          }
  //          common: array[fs_opt_elem[fs_options_common]] {
  //          }
  //          null: const = 0x6b (1 bytes)
  //        }
  //      }
  //    }
  //  ]
  NONFAILING(memcpy((void*)0x200000000000, "./file0\000", 8));
  NONFAILING(memcpy((void*)0x200000000040, "9p\000", 3));
  NONFAILING(memcpy((void*)0x200000000280, "trans=fd,", 9));
  NONFAILING(memcpy((void*)0x200000000289, "rfdno", 5));
  NONFAILING(*(uint8_t*)0x20000000028e = 0x3d);
  NONFAILING(sprintf((char*)0x20000000028f, "0x%016llx", (long long)r[0]));
  NONFAILING(*(uint8_t*)0x2000000002a1 = 0x2c);
  NONFAILING(memcpy((void*)0x2000000002a2, "wfdno", 5));
  NONFAILING(*(uint8_t*)0x2000000002a7 = 0x3d);
  NONFAILING(sprintf((char*)0x2000000002a8, "0x%016llx", (long long)r[2]));
  NONFAILING(*(uint8_t*)0x2000000002ba = 0x2c);
  NONFAILING(*(uint8_t*)0x2000000002bb = 0x6b);
  syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200000000000ul,
          /*type=*/0x200000000040ul, /*flags=*/0ul, /*opts=*/0x200000000280ul);
  //  chmod arguments: [
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
  //    }
  //    mode: open_mode = 0x0 (8 bytes)
  //  ]
  NONFAILING(memcpy((void*)0x200000000140, "./file0\000", 8));
  syscall(__NR_chmod, /*file=*/0x200000000140ul, /*mode=*/0ul);
  //  creat arguments: [
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
  //    }
  //    mode: open_mode = 0x0 (8 bytes)
  //  ]
  //  returns fd
  NONFAILING(memcpy((void*)0x200000000300, "./file0\000", 8));
  res = syscall(__NR_creat, /*file=*/0x200000000300ul, /*mode=*/0ul);
  if (res != -1)
    r[3] = res;
  //  pwritev2 arguments: [
  //    fd: fd (resource)
  //    vec: ptr[in, array[iovec[in, array[int8]]]] {
  //      array[iovec[in, array[int8]]] {
  //        iovec[in, array[int8]] {
  //          addr: ptr[in, buffer] {
  //            buffer: {1f} (length 0x1)
  //          }
  //          len: len = 0xf000 (8 bytes)
  //        }
  //      }
  //    }
  //    vlen: len = 0x1 (8 bytes)
  //    off_low: int32 = 0x8 (4 bytes)
  //    off_high: int32 = 0x7 (4 bytes)
  //    flags: rwf_flags = 0x17 (8 bytes)
  //  ]
  NONFAILING(*(uint64_t*)0x200000000200 = 0x200000000340);
  NONFAILING(memset((void*)0x200000000340, 31, 1));
  NONFAILING(*(uint64_t*)0x200000000208 = 0xf000);
  syscall(__NR_pwritev2, /*fd=*/r[3], /*vec=*/0x200000000200ul, /*vlen=*/1ul,
          /*off_low=*/8, /*off_high=*/7,
          /*flags=RWF_APPEND|RWF_SYNC|RWF_HIPRI|RWF_DSYNC*/ 0x17ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*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=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
    }
  }
  sleep(1000000);
  return 0;
}