// https://syzkaller.appspot.com/bug?id=d35e6e87b80e5a6c58e1efc948feeda006b7adb3
// 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 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_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();
  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 = 0;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  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);
  setup_common();
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  loop();
  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) {
  }
}

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()
{
  int fd;
  for (fd = 3; fd < MAX_FDS; fd++)
    close(fd);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; 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 (;;) {
      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;
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0x0, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x11ul, 0x800000003ul, 0);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20000080 = 0x11;
  memcpy((void*)0x20000082,
         "\x00\x00\x01\x00\x00\x00\x00\x00\x08\x00\x44\x94\x4e\xeb\xa7\x1a\x49"
         "\x76\xe2\x52\x92\x2c\xb1\x8f\x6e\x2e\x2a\xba\x00\x00\x00\x01\x2e\x0b"
         "\x38\x36\x00\x54\x04\xb0\xe0\x30\x1a\x4c\xe8\x75\xf2\xe3\xff\x5f\x16"
         "\x3e\xe3\x40\xb7\x67\x95\x00\x80\x00\x00\x00\x00\x00\x00\x01\x01\x01"
         "\x3c\x58\x11\x03\x9e\x15\x77\x50\x27\xec\xce\x66\xfd\x79\x2b\xbf\x0e"
         "\x5b\xf5\xff\x1b\x08\x16\xf3\xf6\xdb\x1c\x00\x01\x00\x00\x00\x00\x00"
         "\x00\x00\x49\x74\x00\x00\x00\x00\x00\x00\x00\x06\xad\x8e\x5e\xcc\x32"
         "\x6d\x3a\x09\xff\xc2\xc6\x54",
         126);
  syscall(__NR_bind, r[0], 0x20000080ul, 0x80ul);
  *(uint32_t*)0x20000000 = 0x14;
  res = syscall(__NR_getsockname, r[0], 0x200003c0ul, 0x20000000ul);
  if (res != -1)
    r[1] = *(uint32_t*)0x200003c4;
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[2] = res;
  *(uint64_t*)0x200007c0 = 0;
  *(uint32_t*)0x200007c8 = 0;
  *(uint64_t*)0x200007d0 = 0x20000300;
  *(uint64_t*)0x20000300 = 0x20000880;
  *(uint32_t*)0x20000880 = 0x154;
  *(uint16_t*)0x20000884 = 0x24;
  *(uint16_t*)0x20000886 = 0xf0b;
  *(uint32_t*)0x20000888 = 0;
  *(uint32_t*)0x2000088c = 0;
  *(uint8_t*)0x20000890 = 0;
  *(uint8_t*)0x20000891 = 0;
  *(uint16_t*)0x20000892 = 0;
  *(uint32_t*)0x20000894 = r[1];
  *(uint16_t*)0x20000898 = 0;
  *(uint16_t*)0x2000089a = 0;
  *(uint16_t*)0x2000089c = -1;
  *(uint16_t*)0x2000089e = -1;
  *(uint16_t*)0x200008a0 = 0;
  *(uint16_t*)0x200008a2 = 0;
  *(uint16_t*)0x200008a4 = 0xa;
  *(uint16_t*)0x200008a6 = 1;
  memcpy((void*)0x200008a8, "choke\000", 6);
  *(uint16_t*)0x200008b0 = 0x124;
  *(uint16_t*)0x200008b2 = 2;
  *(uint16_t*)0x200008b4 = 0x104;
  *(uint16_t*)0x200008b6 = 2;
  memcpy((void*)0x200008b8,
         "\x21\xed\xe7\xa7\xe5\x31\xd6\xc9\x40\xca\x6e\xd6\x32\xe2\xc0\x85\x14"
         "\x41\x7d\xb0\xdd\x06\x10\x04\x7d\xfe\xd0\xb6\xe2\x7d\xff\xd4\x80\xcc"
         "\x53\x94\x31\xc5\xd5\xd1\xac\xec\x5c\xdc\x67\x64\xfd\xc4\xc1\x25\x59"
         "\x27\x6a\x7a\xfb\xb5\xd8\x4b\x22\x3d\xf4\x8e\x0c\xed\xf9\x5d\x48\x38"
         "\x3b\x95\xf2\x13\x97\x94\x48\x81\xdc\x7a\x4b\x25\x4c\xea\xee\x10\x93"
         "\xa6\xbd\x0f\xa8\x4a\x47\x73\xbc\xd3\x01\x10\xaa\x1c\xd4\xb3\x6e\x01"
         "\x7c\x0f\x26\xca\x9d\xa8\x36\xbb\xd1\xc8\x3e\x80\x30\xce\x40\xee\x7b"
         "\x89\x59\xf1\xb2\xae\x3a\xa8\x86\x0d\xab\xae\xd3\x98\x57\x0a\xf9\xb2"
         "\xcd\x7e\x7b\x09\xed\x86\xed\x53\x90\xa5\x23\x3a\xf5\x4e\xf1\x35\x2a"
         "\x30\xcb\xc0\xb0\xa4\xfc\x43\x78\x2a\x54\xae\x57\x31\xdf\x7b\x84\x12"
         "\x7d\xa1\xbc\x56\xee\x7f\x9a\x18\x0f\xd3\x59\xdd\x9c\xf5\x97\x56\x6c"
         "\x63\xb0\x9e\xa8\xf4\xfc\x6f\x4e\x2c\x53\xc8\xc0\x32\x99\x7e\x5a\xce"
         "\xa3\x01\xf8\x34\x69\xa4\xc7\xfe\x3f\xd0\x0c\x29\x28\x31\x4d\xd3\x7f"
         "\x90\x05\xf7\x03\xa0\x03\x1e\x0f\xc6\x14\xe5\x11\x0f\xd9\x1c\xfe\x86"
         "\x91\xf4\x7b\xd3\x84\x04\xcc\x11\xaf\x65\x40\xb6\xf5\x6d\xd5\x3f\x52"
         "\xaf",
         256);
  *(uint16_t*)0x200009b8 = 0x14;
  *(uint16_t*)0x200009ba = 1;
  *(uint32_t*)0x200009bc = 0;
  *(uint32_t*)0x200009c0 = 0;
  *(uint32_t*)0x200009c4 = 0;
  *(uint8_t*)0x200009c8 = 0x1d;
  *(uint8_t*)0x200009c9 = 0x19;
  *(uint8_t*)0x200009ca = 0x1c;
  *(uint8_t*)0x200009cb = 0;
  *(uint16_t*)0x200009cc = 8;
  *(uint16_t*)0x200009ce = 3;
  *(uint32_t*)0x200009d0 = 0;
  *(uint64_t*)0x20000308 = 0x154;
  *(uint64_t*)0x200007d8 = 1;
  *(uint64_t*)0x200007e0 = 0;
  *(uint64_t*)0x200007e8 = 0;
  *(uint32_t*)0x200007f0 = 0;
  syscall(__NR_sendmsg, r[2], 0x200007c0ul, 0ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  do_sandbox_none();
  return 0;
}