// https://syzkaller.appspot.com/bug?id=a7e7703f43319750ed88a5c0d930d283b51f4e77
// 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;
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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[6] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0,
                 0xffffffffffffffff, 0xffffffffffffffff, 0x0};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x200001c0 = 0;
  *(uint32_t*)0x200001c8 = 0;
  *(uint64_t*)0x200001d0 = 0x20000180;
  *(uint64_t*)0x20000180 = 0;
  *(uint64_t*)0x20000188 = 0;
  *(uint64_t*)0x200001d8 = 1;
  *(uint64_t*)0x200001e0 = 0;
  *(uint64_t*)0x200001e8 = 0;
  *(uint32_t*)0x200001f0 = 0;
  syscall(__NR_sendmsg, r[1], 0x200001c0ul, 0ul);
  *(uint32_t*)0x20000200 = 0x14;
  res = syscall(__NR_getsockname, r[1], 0x20000100ul, 0x20000200ul);
  if (res != -1)
    r[2] = *(uint32_t*)0x20000104;
  res = syscall(__NR_socket, 0x10ul, 3ul, 0);
  if (res != -1)
    r[3] = res;
  res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
  if (res != -1)
    r[4] = res;
  *(uint64_t*)0x20000080 = 0;
  *(uint32_t*)0x20000088 = 0x382;
  *(uint64_t*)0x20000090 = 0x20000140;
  *(uint64_t*)0x20000140 = 0;
  *(uint64_t*)0x20000148 = 0xb7ff;
  *(uint64_t*)0x20000098 = 1;
  *(uint64_t*)0x200000a0 = 0;
  *(uint64_t*)0x200000a8 = 0;
  *(uint32_t*)0x200000b0 = 0;
  syscall(__NR_sendmsg, r[4], 0x20000080ul, 0ul);
  *(uint32_t*)0x20000200 = 0x14;
  res = syscall(__NR_getsockname, r[4], 0x20000100ul, 0x20000200ul);
  if (res != -1)
    r[5] = *(uint32_t*)0x20000104;
  *(uint64_t*)0x20000180 = 0;
  *(uint32_t*)0x20000188 = 0;
  *(uint64_t*)0x20000190 = 0x200000c0;
  *(uint64_t*)0x200000c0 = 0x20001280;
  memcpy((void*)0x20001280, "\x34\x00\x00\x00\x10\x00\x01\x04\x00\x00\x00\x00"
                            "\x00\x00\x00\x00\x00\x00\x00\x00",
         20);
  *(uint32_t*)0x20001294 = r[5];
  memcpy((void*)0x20001298,
         "\x00\x00\x00\x00\x00\x00\x00\x00\x14\x00\x12\x00\x0c\x00\x01\x00\x62"
         "\x72\x69\x64\x67\x65\x00\x00\x03\x00\x02\x00\x92\xab\x29\xe6\xbc\x90"
         "\x31\x3f\x5c\x14\xa8\xd5\xd4\x53\x4e\x46\x6f\x18\xe7\x65\xb4\xfd\x2a"
         "\x0e\x0f\xfa\xbd\x5f\x88\x4b\x82\x15\x62\x79\x62\xf7\xa4\xaa\xb6\x69"
         "\x13\x29\x69\x2a\xfb\x3f\xdc\xc3\xe7\x37\x88\x71\xf4\x30\xfe\x0e\x63"
         "\xa1\x39\xf8\x43\x2b\x7c\x88\xd9\x52\xfe\xc2\xb4\xb0\x54\x30\x63\x91"
         "\x45\x75\xe8\x9d\xce\x08\x91\x7e\xf4\xc8\x39\x82\x30\x4f\x91\xf2\x31"
         "\xdc\x1e\xcf\x62\xc4\xbf\x05\x41\xff\x2b\x50\x60\xb6\xa4\xd6\x9b\x94"
         "\x03\xc9\x64\x22\xfd\x86\x32\xe4\x3e\x94\x66\x36\x59\x9d\xed\xd7\x25"
         "\xbc\xd8\x3c\x89\x71\x19\x8e\x43\xe2\x9e\x4b\x1c\x15\x38\x8e\x01\xde"
         "\xe5\xbf\x7c\x4e\x12\x8f\xf5\xb5\xc1\x46\xc1\x5d\xb0\x68\x4e\x76\x18"
         "\x6c\x1d\x42\x09\xd8\xb4\x15\x8f\x7b\x35\x9d\x8e\xfa\x69\x23\x12\x77"
         "\xe0\x9c\x47\x88\x4e\x9f\xb0\xb0\x10\x68\x74\x09\xfc\x6f\xa7\x3c\x91"
         "\xc9\x50\x4b\x44\x60\xa9\x1a\x86\x5e\x08\x97\xf1\x0d\xc1\xc1\xe0\xed"
         "\xc0\xd5\x60\xf1\x84\x78\xd6\x7c\xc5\xcf\x8d\xbb\x0e\xe5\x00\x3f\x6c"
         "\xc7\x18\x5e\x99\xbc\x93\xbc\xb9\xeb\x76\xab\xba\x12\x07\x6a\x8d\x07"
         "\x6c\x85\x30\x92\xed\xf7\x3f\x42\x24\xc4\xe7\x70\x00\x66\x30\xb3\xa7"
         "\xe4\x3c\x7e\x4c\x90\xce\x6a\x20\xfa\xc9\x46\x58\x4d\x40\x6a\xa1\xcc"
         "\x75\x10\x3f\x74\x6d\x1f\x02\x64\x56\xe4\x4c\x9a\x39\xc6\x2e\xec\xdb"
         "\x8b\xb8\x2c\xa2\x75\xe2\x4c\x5c\x90\x95\xcb\xc8\xa6\x70\x1a\x24\x47"
         "\xf9\xf6\xe6\xe4\xa3\x72\x71\x73\x66\xf1\x76\xf0\xe4\xdf\x46\xe9\xe2"
         "\x8e\xde\x8a\x00\xe2\xa8\xb3\xdc",
         365);
  *(uint64_t*)0x200000c8 = 0x34;
  *(uint64_t*)0x20000198 = 1;
  *(uint64_t*)0x200001a0 = 0;
  *(uint64_t*)0x200001a8 = 0;
  *(uint32_t*)0x200001b0 = 0;
  syscall(__NR_sendmsg, r[3], 0x20000180ul, 0ul);
  *(uint64_t*)0x20000140 = 0;
  *(uint32_t*)0x20000148 = 0;
  *(uint64_t*)0x20000150 = 0x20000000;
  *(uint64_t*)0x20000000 = 0x20000080;
  *(uint32_t*)0x20000080 = 0x3c;
  *(uint16_t*)0x20000084 = 0x10;
  *(uint16_t*)0x20000086 = 0x581;
  *(uint32_t*)0x20000088 = 0;
  *(uint32_t*)0x2000008c = 0;
  *(uint8_t*)0x20000090 = 0;
  *(uint8_t*)0x20000091 = 0;
  *(uint16_t*)0x20000092 = 0;
  *(uint32_t*)0x20000094 = r[5];
  *(uint32_t*)0x20000098 = 0;
  *(uint32_t*)0x2000009c = 0;
  *(uint16_t*)0x200000a0 = 0x14;
  STORE_BY_BITMASK(uint16_t, , 0x200000a2, 0x12, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200000a3, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200000a3, 1, 7, 1);
  *(uint16_t*)0x200000a4 = 0xb;
  *(uint16_t*)0x200000a6 = 1;
  memcpy((void*)0x200000a8, "ipvlan\000", 7);
  *(uint16_t*)0x200000b0 = 4;
  STORE_BY_BITMASK(uint16_t, , 0x200000b2, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200000b3, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200000b3, 1, 7, 1);
  *(uint16_t*)0x200000b4 = 8;
  *(uint16_t*)0x200000b6 = 5;
  *(uint32_t*)0x200000b8 = r[2];
  *(uint64_t*)0x20000008 = 0x3c;
  *(uint64_t*)0x20000158 = 1;
  *(uint64_t*)0x20000160 = 0;
  *(uint64_t*)0x20000168 = 0;
  *(uint32_t*)0x20000170 = 0;
  syscall(__NR_sendmsg, r[0], 0x20000140ul, 0ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0ul);
  do_sandbox_none();
  return 0;
}