// https://syzkaller.appspot.com/bug?id=0ff29101efe3523c886bd8b912945241a1c6b1b4
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.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 <unistd.h>

#include <linux/capability.h>

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 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);
}

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 close_fds()
{
  int fd;
  for (fd = 3; fd < 30; fd++)
    close(fd);
}

uint64_t r[1] = {0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x2000000000000021, 2, 2);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x200002c0 = 0x21;
  *(uint16_t*)0x200002c2 = 0;
  *(uint16_t*)0x200002c4 = 2;
  *(uint16_t*)0x200002c6 = 0x10;
  *(uint16_t*)0x200002c8 = 2;
  *(uint16_t*)0x200002ca = htobe16(0x4e24);
  *(uint32_t*)0x200002cc = htobe32(-1);
  syscall(__NR_connect, r[0], 0x200002c0, 0x24);
  *(uint64_t*)0x20005c00 = 0;
  *(uint32_t*)0x20005c08 = 0;
  *(uint64_t*)0x20005c10 = 0;
  *(uint64_t*)0x20005c18 = 0;
  *(uint64_t*)0x20005c20 = 0x20000b00;
  memcpy(
      (void*)0x20000b00,
      "\x18\x00\x00\x00\x00\x00\x00\x00\x10\x01\x00\x00\x01\x00\x00\x00\x77\x00"
      "\x00\x00\x00\x00\x00\x00\xf4\x1b\x25\xe4\x06\xd5\x89\x37\xe7\xe8\x99\xe0"
      "\x52\x48\x43\xc9\x57\x7f\x89\xf7\x1e\xbd\xdf\x07\x77\x98\xb4\x7a\xb4\xa7"
      "\x69\x07\x47\x7a\x20\x95\x22\xad\xca\x7e\x54\x54\xb7\xde\xc9\xd9\xa6\x73"
      "\x05\xc0\x4a\x8c\xcf\xfc\xa5\x6c\xcb\xca\xbf\xb2\x5c\xc9\x46\x28\x34\x8a"
      "\x24\x59\x3c\x5d\xbd\xf2\x00\x79\x6a\x8f\xd2\x17\x36\x7c\x01\x7f\x76\xf1"
      "\x31\xc8\x69\x3a\xc4\x3b\x77\x47\x1b\xe9\x14\x70\x7d\x2c\x35\x45\xb8\x12"
      "\xf7\xf5\x8f\x43\x67\x06\xf1\x7b\x26\xae\x32\x08\xe5\x80\x9f\x51\x52\x8f"
      "\x24\x36\x61\x0c\x52\xb7\x24\x99\x31\x41\xa5\xcb\x7a\x0a\x9c\x3d\xca\x0a"
      "\x16\x78\x7a\x4d\x0c\x82\xe2\xd9\x82\x92\x19\xe3\xd9\x81\xd1\x96\xf1\xb7"
      "\x25\x6c\x49\xaa\xc9\x6b\x00\x00\x00\x00\x21\x50\xa4\x05\x8a\x8e\x43\x47"
      "\xe1\x3f\x94\xbe\x6d\x87\xfc\x7e\xcd\xaf\xb8\x8b\x1a\x03\xb8\xd9\xe4\xea"
      "\xc3\xf0\x07\xe5\xc2\x5f\xac\x97\x0f\x73\xd3\xfe\x7d\x1f\x03\x6c\x1e\x5b"
      "\x40\x46\x42\x69\xb3\xa1\x07\x1a\x96\xf3\xd5\xfd\xf7\xa8\xe7\xb9\x07\xd2"
      "\x36\xe9\x1a\x85\xb6\xe2\xa1\x3b\x6b\x5e\xb5\x58\xd0\x81\xf5\xb2\x24\x4a"
      "\x7c\x56\x69\xb2\x24\xb8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x00\x00\xe0\xed\x69\x3d\x9a\xc6\x59\x70\x4b\x4f\xa0\x97\x80\xc4\x23"
      "\xf9\xfd\x68\x79\xd3\xca\xf4\xbb\x37\x8d\xe7\x3f\xb2\xe4\x31\xa2\x37\xac"
      "\x80\x37\xf5\x1a\xb4\x30\x9a\xcd\x78\xbe\xaf\x5f\xc8\xe0\x72\x22\x49\xd0"
      "\x4e\x7e\x42\x22\xe2\x3b\x89\x12\x87\x58\x46\x31\x2f\xa0\x5e\x54\x9e\xf9"
      "\xd3\x39\x89\xfc\x4a\x7a\xd5\x58\x3a\xeb\x5b\x89\xaa\xa4\x06\x46\xf9\xcd"
      "\x41\x3f\x15\xca\x1d\x04\xdb\x04\x17\xbf\xd7\x60\x8a\x64\xbd\xab\x97\xdd"
      "\x87\x46\xf7\x83\x86\x51\x74\xf3\x95\xa8\xda\x3c\x29\xf8\x07\xd5\xd0\x6f"
      "\xa1\x7a\xb9\x8c\x5e\xb9\x65\x84\xa3\x40\x9f\x93\x65\x2c\x43\xb5\xed\x79"
      "\x43\xd4\x0e\x38\x1d\x41\xc5\x8a\x8b\xdd\xaa\x32\x08\x43\xea\x01\x8f\xfc"
      "\x07\x7a\x70\xa1\x35\xa2\x75\x0d\x0d\x5c\xe0\x48\xd9\x2b\x90\xef\x35\x9a"
      "\xcb\xfd\x3a\xcc\x58\xce\xf2\xad\xfb\xbc\x86\x95\xf5\x9f\x21\xe3\x30\xa0"
      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
      496);
  *(uint64_t*)0x20005c28 = 0x18;
  *(uint32_t*)0x20005c30 = 0;
  *(uint32_t*)0x20005c38 = 0;
  syscall(__NR_sendmmsg, r[0], 0x20005c00, 1, 0);
  close_fds();
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  do_sandbox_none();
  return 0;
}