// https://syzkaller.appspot.com/bug?id=80b047eb9aff0254f4adc620c6891c0ca3276309
// 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/prctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/genetlink.h>
#include <linux/netlink.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;
}

static long syz_genetlink_get_family_id(volatile long name)
{
  char buf[512] = {0};
  struct nlmsghdr* hdr = (struct nlmsghdr*)buf;
  struct genlmsghdr* genlhdr = (struct genlmsghdr*)NLMSG_DATA(hdr);
  struct nlattr* attr = (struct nlattr*)(genlhdr + 1);
  hdr->nlmsg_len =
      sizeof(*hdr) + sizeof(*genlhdr) + sizeof(*attr) + GENL_NAMSIZ;
  hdr->nlmsg_type = GENL_ID_CTRL;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
  genlhdr->cmd = CTRL_CMD_GETFAMILY;
  attr->nla_type = CTRL_ATTR_FAMILY_NAME;
  attr->nla_len = sizeof(*attr) + GENL_NAMSIZ;
  strncpy((char*)(attr + 1), (char*)name, GENL_NAMSIZ);
  struct iovec iov = {hdr, hdr->nlmsg_len};
  struct sockaddr_nl addr = {0};
  addr.nl_family = AF_NETLINK;
  int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (fd == -1) {
    return -1;
  }
  struct msghdr msg = {&addr, sizeof(addr), &iov, 1, NULL, 0, 0};
  if (sendmsg(fd, &msg, 0) == -1) {
    close(fd);
    return -1;
  }
  ssize_t n = recv(fd, buf, sizeof(buf), 0);
  close(fd);
  if (n <= 0) {
    return -1;
  }
  if (hdr->nlmsg_type != GENL_ID_CTRL) {
    return -1;
  }
  for (; (char*)attr < buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID)
      return *(uint16_t*)(attr + 1);
  }
  return -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 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();
      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[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  syscall(__NR_mmap, 0x20002000ul, 0x1000ul, 2ul, 0x840000000000a132ul, -1,
          0ul);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0x10);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20000000, "TIPCv2\000", 7);
  res = syz_genetlink_get_family_id(0x20000000);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x200000c0 = 0;
  *(uint32_t*)0x200000c8 = 0;
  *(uint64_t*)0x200000d0 = 0x20000080;
  *(uint64_t*)0x20000080 = 0x20001640;
  memcpy((void*)0x20001640, " \000\000\000", 4);
  *(uint16_t*)0x20001644 = r[1];
  memcpy((void*)0x20001646,
         "\x03\x0b\x00\x20\x00\x00\x00\x00\x00\x00\x13\x00\x00\x00\x0c\x00\x09"
         "\x80\x08\x00\x02\x00\x05\x00\x00\x41\xd2\x8c\x7f\x18\x32\xd4\x35\xf4"
         "\xc4\xb1\x0d\x1c\x36\x2f\x68\x91\x0d\xed\x97\x19\xee\x3e\x99\x58\x57"
         "\xea\x99\xcb\xec\x38\xed\x6d\x2b\x99\x9d\x4c\xcd\x79\x88\x39\x2b\xb1"
         "\xfe\xc5\x58\xac\x6d\x85\xb9\x42\x34\x79\x0b\x06\x3d\x86\x02\xa3\x13"
         "\xd1\xd0\x79\x43\x1f\x5b\x5b\x82\x1c\xa0\x1b\xe0\x12\x61\x75\x6d\x01"
         "\x84\x0d\xe5\x99\x0e\xf8\xb6\xa3\xbf\x1b\x49\x85\x02\x2d\x10\xc5\x5d"
         "\x8f\x54\x6a\x76\xbb\xf7\x71\x5b\x45\x0c\x8e\x8d\x81\xe1\x91\xd8\xf7"
         "\x9b\xdc\x36\xe2\x3b\xdc\x7b\x10\x15\x48\xc5\x11\x63\x7e\xac\x24\x79"
         "\xf0\x7a\xf9\x4f\xe1\x87\xd9\x29\x79\xac\x1d\x57\xfa\x3a\xa6\x11\xf1"
         "\x6f\xd9\xdc\x2c\x21\x33\x33\xf5\xef\x1e\x13\x51\x16\x9a\xc7\x42\x9b"
         "\xaa\xac\x33\xdb\x3b\x4b\xc7\x91\xbf\x2a\xf6\xc4\xab\xe3\xdb\x48\x08"
         "\xc8\x7f\x06\x04\x0f\x7d\xbf\x2b\x8a\x46\x63\x97\x8f\x7f\xc8\x4d",
         220);
  *(uint64_t*)0x20000088 = 0x20;
  *(uint64_t*)0x200000d8 = 1;
  *(uint64_t*)0x200000e0 = 0;
  *(uint64_t*)0x200000e8 = 0;
  *(uint32_t*)0x200000f0 = 0;
  syscall(__NR_sendmsg, r[0], 0x200000c0ul, 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);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}