// https://syzkaller.appspot.com/bug?id=b8eb5f8fd32b7c4578e59cafacdf0f31c8c8114e
// 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);
  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 (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);
  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);
  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 (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5000) {
        continue;
      }
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
  if (res != -1)
    r[0] = 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[0], 0x20000080ul, 0ul);
  *(uint32_t*)0x20000200 = 0x14;
  syscall(__NR_getsockname, r[0], 0x20000100ul, 0x20000200ul);
  res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
  if (res != -1)
    r[1] = res;
  res = syscall(__NR_socket, 1ul, 0x803ul, 0);
  if (res != -1)
    r[2] = res;
  *(uint32_t*)0x20000200 = 0x14;
  res = syscall(__NR_getsockname, r[2], 0x20000100ul, 0x20000200ul);
  if (res != -1)
    r[3] = *(uint32_t*)0x20000104;
  *(uint64_t*)0x200001c0 = 0;
  *(uint32_t*)0x200001c8 = 0;
  *(uint64_t*)0x200001d0 = 0x20000300;
  *(uint64_t*)0x20000300 = 0x20000580;
  memcpy((void*)0x20000580,
         "\x40\x00\x00\x00\x14\x00\xb5\x95\x00\x00\x00\x00\x00\x00\x00\x00\x0a"
         "\x40\x00\x00",
         20);
  *(uint32_t*)0x20000594 = r[3];
  memcpy(
      (void*)0x20000598,
      "\x14\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe5\xff\xac\x14"
      "\x14\x00\x14\x00\x06\x00\x00\x00\x00\x00\x06\x00\x00\x00\x00\x00\x13\x00"
      "\x00\x00\x00\x00\x29\x97\x4b\x41\x43\x2a\xf9\xf8\x64\x13\xed\x09\x7e\xb3"
      "\x9f\xed\x67\xba\x38\xfc\x03\x15\xf6\x45\xb5\x7e\x1f\x6e\x3d\x7c\x2d\x6b"
      "\x5e\xc4\xea\xbd\xca\xe0\xa1\xf4\x2f\x5b\xb3\xe3\x4f\xc8\x40\x57\xfc\x33"
      "\xe9\xbe\x67\xb9\x45\x05\x98\x67\xcd\x6f\xad\x64\x5a\x60\xa8\x74\x02\xf8"
      "\xbf\xa7\x06\x6d\x63\xeb\x81\xc7\x12\x1e\x02\xd7\x17\x25\x10\x4b\xa2\x31"
      "\x9b\x9b\x1a\x22\x85\x48\x90\xc6\x1e\xc4\xf1\x99\xe1\x17\xae\x24\xc2\xfa"
      "\xf5\x56\xab\x9e\xe2\x6b\x2f\xc3\xfa\xb6\xa4\xa7\x0a\x30\x85\x59\x2a\x64"
      "\xa8\x7c\xd3\x58\xb7\xea\x86\x90\xac\x34\x22\xd3\x77\x3c\x7b\xc4\x42\xa3"
      "\x82\x9f\x99\x93\x37\x45\x70\xc0\x73\xac\xc6\x82\x55\xd6\x08\x83\x86\xd5"
      "\xbd\xad\x30\xaa\x9d\x82\x1c\x5a\x28\x87\xd1\xb2\x1e\x7f\x82\x83\x6a\x82"
      "\x3e\x6e\xce\xa5\x3a\xa7\x42\x3f\x4e\x95\x80\xe9\x9a\x0b\x77\xdb\xc2\xfe"
      "\xdf\x00\x81\xb7\xe7\x36\xe0\x94\x58\x2e\x16\x7a\x2b\x0b\xcf\x78\xc3\xdb"
      "\x24\x0d\x65\x61\x72\x77\xd5\xf8\xdf\x5c\xe1\x44\xad\xac\xe6\xfc\x0f\x76"
      "\x77\x32\x14\x06\xac\x23\x24\xe2\x14\x7e\xc6\x53\xe4\x96\x7c\x84\x88\x1f"
      "\x7c\x35\x4c\x16\x5e\x2c\xeb\x6b\xe2\x5d",
      298);
  *(uint64_t*)0x20000308 = 0x40;
  *(uint64_t*)0x200001d8 = 1;
  *(uint64_t*)0x200001e0 = 0;
  *(uint64_t*)0x200001e8 = 0;
  *(uint32_t*)0x200001f0 = 0;
  syscall(__NR_sendmsg, r[1], 0x200001c0ul, 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;
}