// https://syzkaller.appspot.com/bug?id=1d41dcf6c06c62c5ef8aa79a80d0102c672f47c4
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

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

#include <linux/capability.h>

static unsigned long long procid;

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;
}

#define MAX_FDS 30

static void setup_gadgetfs();
static void setup_binderfs();
static void setup_fusectl();
static void sandbox_common_mount_tmpfs(void)
{
  write_file("/proc/sys/fs/mount-max", "100000");
  if (mkdir("./syz-tmp", 0777))
    exit(1);
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot", 0777))
    exit(1);
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    exit(1);
  unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    exit(1);
  if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    exit(1);
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) {
    if (errno != ENOENT)
      exit(1);
    if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) &&
        errno != ENOENT)
      exit(1);
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    exit(1);
  if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL))
    exit(1);
  if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/proc/sys/fs/binfmt_misc",
            "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags,
            NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/newroot/syz-inputs", 0700))
    exit(1);
  if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL,
            bind_mount_flags | MS_RDONLY, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/pivot", 0777))
    exit(1);
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      exit(1);
  } else {
    if (chdir("/"))
      exit(1);
    if (umount2("./pivot", MNT_DETACH))
      exit(1);
  }
  if (chroot("./newroot"))
    exit(1);
  if (chdir("/"))
    exit(1);
  setup_gadgetfs();
  setup_binderfs();
  setup_fusectl();
}

static void setup_gadgetfs()
{
  if (mkdir("/dev/gadgetfs", 0777)) {
  }
  if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) {
  }
}

static void setup_fusectl()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
  }
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  if (getppid() == 1)
    exit(1);
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  sandbox_common_mount_tmpfs();
  loop();
  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 close_fds()
{
  for (int fd = 3; fd < MAX_FDS; fd++)
    close(fd);
}

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();
      close_fds();
      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;
    }
  }
}

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)) {
  }
  //  prlimit64 arguments: [
  //    pid: pid (resource)
  //    res: rlimit_type = 0xe (8 bytes)
  //    new: ptr[in, rlimit] {
  //      rlimit {
  //        soft: intptr = 0x8 (8 bytes)
  //        hard: intptr = 0x80000100008b (8 bytes)
  //      }
  //    }
  //    old: nil
  //  ]
  *(uint64_t*)0x200000000100 = 8;
  *(uint64_t*)0x200000000108 = 0x80000100008b;
  syscall(__NR_prlimit64, /*pid=*/0, /*res=RLIMIT_RTPRIO*/ 0xeul,
          /*new=*/0x200000000100ul, /*old=*/0ul);
  //  sched_setscheduler arguments: [
  //    pid: pid (resource)
  //    policy: sched_policy = 0x1 (8 bytes)
  //    prio: ptr[in, int32] {
  //      int32 = 0x7 (4 bytes)
  //    }
  //  ]
  *(uint32_t*)0x200000000300 = 7;
  syscall(__NR_sched_setscheduler, /*pid=*/0, /*policy=SCHED_FIFO*/ 1ul,
          /*prio=*/0x200000000300ul);
  //  prctl$PR_SCHED_CORE arguments: [
  //    option: const = 0x3e (8 bytes)
  //    cmd: intptr = 0x1 (8 bytes)
  //    pid: pid (resource)
  //    type: pid_type = 0x2 (8 bytes)
  //    uaddr: nil
  //  ]
  syscall(__NR_prctl, /*option=*/0x3eul, /*cmd=*/1ul, /*pid=*/0,
          /*type=PIDTYPE_PGID*/ 2ul, /*uaddr=*/0ul);
  //  openat$vhost_vsock arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 76 68 6f 73 74 2d 76 73 6f 63 6b 00} (length
  //      0x11)
  //    }
  //    flags: const = 0x2 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns vhost_vsock
  memcpy((void*)0x2000000015c0, "/dev/vhost-vsock\000", 17);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x2000000015c0ul, /*flags=*/2, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  ioctl$VHOST_SET_VRING_BASE arguments: [
  //    fd: fd_vhost (resource)
  //    cmd: const = 0xaf01 (4 bytes)
  //    arg: nil
  //  ]
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xaf01, /*arg=*/0ul);
  //  eventfd arguments: [
  //    initval: int32 = 0xfffffff9 (4 bytes)
  //  ]
  //  returns fd_event
  res = syscall(__NR_eventfd, /*initval=*/0xfffffff9);
  if (res != -1)
    r[1] = res;
  //  ioctl$VHOST_SET_LOG_FD arguments: [
  //    fd: fd_vhost (resource)
  //    cmd: const = 0x4004af07 (4 bytes)
  //    arg: ptr[in, fd_event] {
  //      fd_event (resource)
  //    }
  //  ]
  *(uint32_t*)0x200000000240 = r[1];
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x4004af07,
          /*arg=*/0x200000000240ul);
  //  ioctl$VHOST_SET_VRING_KICK arguments: [
  //    fd: fd_vhost (resource)
  //    cmd: const = 0x4008af20 (4 bytes)
  //    arg: ptr[in, vhost_vring_file] {
  //      vhost_vring_file {
  //        index: vhost_vring_index = 0x1 (4 bytes)
  //        fd: fd_event (resource)
  //      }
  //    }
  //  ]
  *(uint32_t*)0x200000000040 = 1;
  *(uint32_t*)0x200000000044 = r[1];
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x4008af20,
          /*arg=*/0x200000000040ul);
  //  ioctl$VHOST_SET_VRING_ADDR arguments: [
  //    fd: fd_vhost (resource)
  //    cmd: const = 0x4028af11 (4 bytes)
  //    arg: ptr[in, vhost_vring_addr] {
  //      vhost_vring_addr {
  //        index: vhost_vring_index = 0x0 (4 bytes)
  //        flags: int32 = 0x0 (4 bytes)
  //        desc_user_addr: nil
  //        used_user_addr: ptr[out, buffer] {
  //          buffer: (DirOut)
  //        }
  //        avail_user_addr: nil
  //        log_guest_addr: kvm_guest_addrs = 0x0 (8 bytes)
  //      }
  //    }
  //  ]
  *(uint32_t*)0x200000000140 = 0;
  *(uint32_t*)0x200000000144 = 0;
  *(uint64_t*)0x200000000148 = 0;
  *(uint64_t*)0x200000000150 = 0x200000000500;
  *(uint64_t*)0x200000000158 = 0;
  *(uint64_t*)0x200000000160 = 0;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x4028af11,
          /*arg=*/0x200000000140ul);
  //  ioctl$VHOST_SET_VRING_ADDR arguments: [
  //    fd: fd_vhost (resource)
  //    cmd: const = 0x4028af11 (4 bytes)
  //    arg: ptr[in, vhost_vring_addr] {
  //      vhost_vring_addr {
  //        index: vhost_vring_index = 0x1 (4 bytes)
  //        flags: int32 = 0x1 (4 bytes)
  //        desc_user_addr: nil
  //        used_user_addr: ptr[out, buffer] {
  //          buffer: (DirOut)
  //        }
  //        avail_user_addr: ptr[out, buffer] {
  //          buffer: (DirOut)
  //        }
  //        log_guest_addr: kvm_guest_addrs = 0x100000 (8 bytes)
  //      }
  //    }
  //  ]
  *(uint32_t*)0x200000000280 = 1;
  *(uint32_t*)0x200000000284 = 1;
  *(uint64_t*)0x200000000288 = 0;
  *(uint64_t*)0x200000000290 = 0x2000000000c0;
  *(uint64_t*)0x200000000298 = 0x200000000480;
  *(uint64_t*)0x2000000002a0 = 0x100000;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x4028af11,
          /*arg=*/0x200000000280ul);
  //  ioctl$VHOST_SET_MEM_TABLE arguments: [
  //    fd: fd_vhost (resource)
  //    cmd: const = 0x4008af03 (4 bytes)
  //    arg: ptr[in, vhost_memory] {
  //      vhost_memory {
  //        nregions: len = 0x1 (4 bytes)
  //        padding: const = 0x0 (4 bytes)
  //        regions: array[vhost_memory_region] {
  //          vhost_memory_region {
  //            guest_phys_addr: kvm_guest_addrs = 0x0 (8 bytes)
  //            memory_size: bytesize = 0x78 (8 bytes)
  //            userspace_addr: ptr[out, buffer] {
  //              buffer: (DirOut)
  //            }
  //            flags_padding: const = 0x0 (8 bytes)
  //          }
  //        }
  //      }
  //    }
  //  ]
  *(uint32_t*)0x200000000680 = 1;
  *(uint32_t*)0x200000000684 = 0;
  *(uint64_t*)0x200000000688 = 0;
  *(uint64_t*)0x200000000690 = 0x78;
  *(uint64_t*)0x200000000698 = 0x200000000600;
  *(uint64_t*)0x2000000006a0 = 0;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x4008af03,
          /*arg=*/0x200000000680ul);
  //  ioctl$VHOST_VSOCK_SET_RUNNING arguments: [
  //    fd: vhost_vsock (resource)
  //    cmd: const = 0x4004af61 (4 bytes)
  //    arg: ptr[in, int32] {
  //      int32 = 0x1 (4 bytes)
  //    }
  //  ]
  *(uint32_t*)0x200000000000 = 1;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x4004af61,
          /*arg=*/0x200000000000ul);
}
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;
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}