// https://syzkaller.appspot.com/bug?id=a0810b4aaeaaa419b06709a034db6a83c830fc95
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <netinet/in.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/if_addr.h>
#include <linux/if_link.h>
#include <linux/in6.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/veth.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;
}

struct nlmsg {
  char* pos;
  int nesting;
  struct nlattr* nested[8];
  char buf[4096];
};

static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
                         const void* data, int size)
{
  memset(nlmsg, 0, sizeof(*nlmsg));
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_type = typ;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
  memcpy(hdr + 1, data, size);
  nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
}

static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data,
                         int size)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_len = sizeof(*attr) + size;
  attr->nla_type = typ;
  if (size > 0)
    memcpy(attr + 1, data, size);
  nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}

static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type,
                            int* reply_len, bool dofail)
{
  if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
    exit(1);
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
  struct sockaddr_nl addr;
  memset(&addr, 0, sizeof(addr));
  addr.nl_family = AF_NETLINK;
  ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0,
                     (struct sockaddr*)&addr, sizeof(addr));
  if (n != (ssize_t)hdr->nlmsg_len) {
    if (dofail)
      exit(1);
    return -1;
  }
  n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  if (reply_len)
    *reply_len = 0;
  if (n < 0) {
    if (dofail)
      exit(1);
    return -1;
  }
  if (n < (ssize_t)sizeof(struct nlmsghdr)) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type == NLMSG_DONE)
    return 0;
  if (reply_len && hdr->nlmsg_type == reply_type) {
    *reply_len = n;
    return 0;
  }
  if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type != NLMSG_ERROR) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  errno = -((struct nlmsgerr*)(hdr + 1))->error;
  return -errno;
}

static int netlink_query_family_id(struct nlmsg* nlmsg, int sock,
                                   const char* family_name, bool dofail)
{
  struct genlmsghdr genlhdr;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = CTRL_CMD_GETFAMILY;
  netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name,
               strnlen(family_name, GENL_NAMSIZ - 1) + 1);
  int n = 0;
  int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail);
  if (err < 0) {
    return -1;
  }
  uint16_t id = 0;
  struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN +
                                         NLMSG_ALIGN(sizeof(genlhdr)));
  for (; (char*)attr < nlmsg->buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
      id = *(uint16_t*)(attr + 1);
      break;
    }
  }
  if (!id) {
    errno = EINVAL;
    return -1;
  }
  recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  return id;
}

static long syz_genetlink_get_family_id(volatile long name,
                                        volatile long sock_arg)
{
  int fd = sock_arg;
  if (fd < 0) {
    fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
    if (fd == -1) {
      return -1;
    }
  }
  struct nlmsg nlmsg_tmp;
  int ret = netlink_query_family_id(&nlmsg_tmp, fd, (char*)name, false);
  if ((int)sock_arg < 0)
    close(fd);
  if (ret < 0) {
    return -1;
  }
  return ret;
}

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 setup_sysctl()
{
  int cad_pid = fork();
  if (cad_pid < 0)
    exit(1);
  if (cad_pid == 0) {
    for (;;)
      sleep(100);
  }
  char tmppid[32];
  snprintf(tmppid, sizeof(tmppid), "%d", cad_pid);
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", tmppid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data)) {
    }
  }
  kill(cad_pid, SIGKILL);
  while (waitpid(cad_pid, NULL, 0) != cad_pid)
    ;
}

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

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  memcpy((void*)0x200000000100, "/dev/net/tun\000", 13);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x200000000100ul, /*flags=*/0, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x200000000040, "syzkaller0\000\000\000\000\000\000", 16);
  *(uint16_t*)0x200000000050 = 2;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x400454ca,
          /*arg=*/0x200000000040ul);
  memcpy((void*)0x200000000140, "/dev/net/tun\000", 13);
  res =
      syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
              /*file=*/0x200000000140ul, /*flags=O_APPEND*/ 0x400, /*mode=*/0);
  if (res != -1)
    r[1] = res;
  syscall(__NR_close, /*fd=*/r[1]);
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0x10);
  if (res != -1)
    r[2] = res;
  memcpy((void*)0x2000000000c0, "TIPC\000", 5);
  res = -1;
  res = syz_genetlink_get_family_id(/*name=*/0x2000000000c0, /*fd=*/r[2]);
  if (res != -1)
    r[3] = res;
  *(uint64_t*)0x2000000002c0 = 0;
  *(uint32_t*)0x2000000002c8 = 0;
  *(uint64_t*)0x2000000002d0 = 0x200000000280;
  *(uint64_t*)0x200000000280 = 0x200000000680;
  memcpy((void*)0x200000000680, "8\000\000\000", 4);
  *(uint16_t*)0x200000000684 = r[3];
  memcpy((void*)0x200000000686,
         "\x01\x00\x00\x00\x0d\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00"
         "\x00\x01\x41\x00\x00\x00\x1c\x00\x17\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x65\x74\x68\x3a\x73\x79\x7a\x6b\x61\x6c\x6c\x65\x72\x30",
         48);
  *(uint64_t*)0x200000000288 = 0x38;
  *(uint64_t*)0x2000000002d8 = 1;
  *(uint64_t*)0x2000000002e0 = 0;
  *(uint64_t*)0x2000000002e8 = 0;
  *(uint32_t*)0x2000000002f0 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[2], /*msg=*/0x2000000002c0ul, /*f=*/0ul);
  memcpy((void*)0x200000002280, "syzkaller0\000\000\000\000\000\000", 16);
  memset((void*)0x200000002290, 187, 6);
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x8914, /*arg=*/0x200000002280ul);
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0);
  if (res != -1)
    r[4] = res;
  memcpy((void*)0x200000000100, "syzkaller0\000\000\000\000\000\000", 16);
  res = syscall(__NR_ioctl, /*fd=*/r[4], /*cmd=*/0x8933,
                /*arg=*/0x200000000100ul);
  if (res != -1)
    r[5] = *(uint32_t*)0x200000000110;
  *(uint64_t*)0x200000000000 = 0;
  *(uint32_t*)0x200000000008 = 0;
  *(uint64_t*)0x200000000010 = 0x200000000180;
  *(uint64_t*)0x200000000180 = 0x200000000440;
  *(uint32_t*)0x200000000440 = 0x58;
  *(uint16_t*)0x200000000444 = 0x24;
  *(uint16_t*)0x200000000446 = 0x6541;
  *(uint32_t*)0x200000000448 = 0x70bd27;
  *(uint32_t*)0x20000000044c = 0;
  *(uint8_t*)0x200000000450 = 0;
  *(uint8_t*)0x200000000451 = 0;
  *(uint16_t*)0x200000000452 = 0;
  *(uint32_t*)0x200000000454 = r[5];
  *(uint16_t*)0x200000000458 = 0;
  *(uint16_t*)0x20000000045a = 0xb;
  *(uint16_t*)0x20000000045c = -1;
  *(uint16_t*)0x20000000045e = -1;
  *(uint16_t*)0x200000000460 = 0;
  *(uint16_t*)0x200000000462 = 0xe;
  *(uint16_t*)0x200000000464 = 0xa;
  *(uint16_t*)0x200000000466 = 1;
  memcpy((void*)0x200000000468, "netem\000", 6);
  *(uint16_t*)0x200000000470 = 0x28;
  *(uint16_t*)0x200000000472 = 2;
  *(uint32_t*)0x200000000474 = 0x100;
  *(uint32_t*)0x200000000478 = 7;
  *(uint32_t*)0x20000000047c = 0x6361;
  *(uint32_t*)0x200000000480 = 5;
  *(uint32_t*)0x200000000484 = 0xffffffed;
  *(uint32_t*)0x200000000488 = 6;
  *(uint16_t*)0x20000000048c = 0xc;
  *(uint16_t*)0x20000000048e = 0xa;
  *(uint64_t*)0x200000000490 = 5;
  *(uint64_t*)0x200000000188 = 0x58;
  *(uint64_t*)0x200000000018 = 1;
  *(uint64_t*)0x200000000020 = 0;
  *(uint64_t*)0x200000000028 = 0;
  *(uint32_t*)0x200000000030 = 0x20000001;
  syscall(__NR_sendmsg, /*fd=*/r[4], /*msg=*/0x200000000000ul, /*f=*/0ul);
  *(uint64_t*)0x200000000200 = 0;
  *(uint32_t*)0x200000000208 = 0;
  *(uint64_t*)0x200000000210 = 0x2000000001c0;
  *(uint64_t*)0x2000000001c0 = 0x200000000300;
  *(uint32_t*)0x200000000300 = 0x44;
  *(uint16_t*)0x200000000304 = 0x24;
  *(uint16_t*)0x200000000306 = 0x6d45;
  *(uint32_t*)0x200000000308 = 0x70b923;
  *(uint32_t*)0x20000000030c = 0x7ffff;
  *(uint8_t*)0x200000000310 = 0;
  *(uint8_t*)0x200000000311 = 0;
  *(uint16_t*)0x200000000312 = 0;
  *(uint32_t*)0x200000000314 = r[5];
  *(uint16_t*)0x200000000318 = 0;
  *(uint16_t*)0x20000000031a = 0x10;
  *(uint16_t*)0x20000000031c = 2;
  *(uint16_t*)0x20000000031e = 0xb;
  *(uint16_t*)0x200000000320 = 3;
  *(uint16_t*)0x200000000322 = 0xa;
  *(uint16_t*)0x200000000324 = 9;
  *(uint16_t*)0x200000000326 = 1;
  memcpy((void*)0x200000000328, "cake\000", 5);
  *(uint16_t*)0x200000000330 = 0x14;
  *(uint16_t*)0x200000000332 = 2;
  *(uint16_t*)0x200000000334 = 8;
  *(uint16_t*)0x200000000336 = 0xf;
  *(uint32_t*)0x200000000338 = 1;
  *(uint16_t*)0x20000000033c = 8;
  *(uint16_t*)0x20000000033e = 0xa;
  *(uint32_t*)0x200000000340 = 8;
  *(uint64_t*)0x2000000001c8 = 0x44;
  *(uint64_t*)0x200000000218 = 1;
  *(uint64_t*)0x200000000220 = 0;
  *(uint64_t*)0x200000000228 = 0;
  *(uint32_t*)0x200000000230 = 0x4800;
  syscall(__NR_sendmsg, /*fd=*/r[4], /*msg=*/0x200000000200ul,
          /*f=MSG_MORE|MSG_DONTROUTE|0x10000000*/ 0x10008004ul);
}
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);
  setup_sysctl();
  const char* reason;
  (void)reason;
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}