// https://syzkaller.appspot.com/bug?id=4c27462e8ee48d940efd2c72e64d6acbb46ef47f
// 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/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_fsconfig
#define __NR_fsconfig 431
#endif
#ifndef __NR_mkdir
#define __NR_mkdir 39
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_mount
#define __NR_mount 21
#endif
#ifndef __NR_openat
#define __NR_openat 322
#endif
#ifndef __NR_read
#define __NR_read 3
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

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 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;
}

static long syz_open_procfs(volatile long a0, volatile long a1)
{
  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == -1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  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");
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      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 < 15000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  mkdir arguments: [
  //    path: ptr[in, buffer] {
  //      buffer: {6d 79 5f 73 79 73 00} (length 0x7)
  //    }
  //    mode: open_mode = 0x1ff (4 bytes)
  //  ]
  memcpy((void*)0x20000000, "my_sys\000", 7);
  syscall(
      __NR_mkdir, /*path=*/0x20000000,
      /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
      0x1ff);
  //  mount arguments: [
  //    src: nil
  //    dst: ptr[in, buffer] {
  //      buffer: {6d 79 5f 73 79 73 00} (length 0x7)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {73 79 73 66 73 00} (length 0x6)
  //    }
  //    flags: mount_flags = 0x0 (4 bytes)
  //    data: nil
  //  ]
  memcpy((void*)0x20000200, "my_sys\000", 7);
  memcpy((void*)0x20000300, "sysfs\000", 6);
  syscall(__NR_mount, /*src=*/0, /*dst=*/0x20000200, /*type=*/0x20000300,
          /*flags=*/0, /*data=*/0);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {6d 79 5f 73 79 73 2f 62 75 73 2f 70 63 69 2f 64 65 76 69 63
  //      65 73 2f 30 30 30 30 3a 30 30 3a 30 33 2e 30 2f 72 65 73 6f 75 72 63
  //      65 31 00} (length 0x2e)
  //    }
  //    flags: open_flags = 0x2 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x20000500, "my_sys/bus/pci/devices/0000:00:03.0/resource1\000",
         46);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000500,
                /*flags=O_RDWR*/ 2, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  mmap$IORING_OFF_SQ_RING arguments: [
  //    addr: const = 0x0 (4 bytes)
  //    len: int32 = 0xff (4 bytes)
  //    prot: mmap_prot = 0x0 (4 bytes)
  //    flags: mmap_flags = 0x12 (4 bytes)
  //    fd: fd_io_uring (resource)
  //    offset: const = 0x0 (4 bytes)
  //  ]
  //  returns ring_ptr
  syscall(__NR_mmap, /*addr=*/0, /*len=*/0xff, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_PRIVATE*/ 0x12, /*fd=*/(intptr_t)r[0],
          /*offset=*/0);
  //  fsconfig$FSCONFIG_SET_BINARY arguments: [
  //    fd: fd_fscontext (resource)
  //    cmd: const = 0x2 (4 bytes)
  //    key: ptr[in, buffer] {
  //      buffer: {6d 65 6d 00 ff 45 65 76 f2 72 f1 18 1d b9 00 79 5f 68 75 67
  //      24 08 6f 2d 03 51 60 5d 6f 8c 72 9d 5f 65 74 6c f9 dd 07 ad 5c 48 e9
  //      34 08 2c 48 bf} (length 0x30)
  //    }
  //    value: nil
  //    aux: bytesize = 0x0 (4 bytes)
  //  ]
  memcpy((void*)0x20000040,
         "mem\000\377Eev\362r\361\030\035\271\000y_hug$\bo-\003Q`]o\214r\235_"
         "etl\371\335\a\255\\H\3514\b,H\277",
         48);
  syscall(__NR_fsconfig, /*fd=*/(intptr_t)-1, /*cmd=*/2, /*key=*/0x20000040,
          /*value=*/0, /*aux=*/0);
  //  syz_open_procfs arguments: [
  //    pid: pid (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {} (length 0x0)
  //    }
  //  ]
  //  returns fd
  res = -1;
  res = syz_open_procfs(/*pid=*/0, /*file=*/0x20000040);
  if (res != -1)
    r[1] = res;
  //  read$FUSE arguments: [
  //    fd: fd_fuse (resource)
  //    buf: ptr[out, fuse_in[read_buffer]] {
  //      fuse_in[read_buffer] {
  //        len: len = 0x2020 (4 bytes)
  //        opcode: int32 = 0x0 (4 bytes)
  //        unique: fuse_unique (resource)
  //        uid: uid (resource)
  //        gid: gid (resource)
  //        pid: pid (resource)
  //        padding: int32 = 0x0 (4 bytes)
  //        payload: buffer: (DirOut)
  //      }
  //    }
  //    len: bytesize = 0x2020 (4 bytes)
  //  ]
  syscall(__NR_read, /*fd=*/(intptr_t)r[1], /*buf=*/0x200034c0, /*len=*/0x2020);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x20000000, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x21000000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}