// https://syzkaller.appspot.com/bug?id=53b6555b27af2cae74e2fbdac6cadc73f9cb18aa
// 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*)0x20000080 = 0x21;
  *(uint16_t*)0x20000082 = 0;
  *(uint16_t*)0x20000084 = 2;
  *(uint16_t*)0x20000086 = 0x10;
  *(uint16_t*)0x20000088 = 2;
  *(uint16_t*)0x2000008a = htobe16(0);
  *(uint8_t*)0x2000008c = 0xac;
  *(uint8_t*)0x2000008d = 0x14;
  *(uint8_t*)0x2000008e = 0x14;
  *(uint8_t*)0x2000008f = 0;
  syscall(__NR_connect, r[0], 0x20000080, 0x24);
  *(uint64_t*)0x20005c00 = 0;
  *(uint32_t*)0x20005c08 = 0;
  *(uint64_t*)0x20005c10 = 0;
  *(uint64_t*)0x20005c18 = 0;
  *(uint64_t*)0x20005c20 = 0x200005c0;
  memcpy((void*)0x200005c0,
         "\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\x16\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\x6f\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"
         "\x01\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\x50\xca\x0a\x16\x78\x7a\x4d\x0c\x82\xe2\xd9"
         "\x82\x92\x19\xe3\xd9\x81\xd1\x96\xf1\xb7\x25\x6c\x48\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\xba\x7e\xc6\x3f\x5a\x48\xf6\x74\x15\xf2\xaa\x4e\xfe"
         "\x55\x0b\xf0\x09\xa2\x61\xbe\x14\xf5\x52\x5e\x77\xc6\x0c\x86\x13\xd7"
         "\x08\xf7\x8f\xfc\x0f\xe0\x1e\x7d\x69\x91\xec\x37\x9e\xc7\x3f\xd0\x58"
         "\x01\x0b\x6d\x4c\x96\x9e\x4f\xb9\x9d\x05\x1b\x85\xd8\x05\xed\xbd\x4d"
         "\x37\x00\x7a\x8c\xa9\x14\x4c\x1c\xab\x41\xd7\x4c\x06\x82\x3e\x7d\x71"
         "\x15\x10\x74\xf0\x10\x8c\x4e\xfa\xd0\x6c\xff\x12\xdc\xb8\x67\x0e\xfb"
         "\xf6\x7a\xba\x81\x2d\xd4\xda\x54\x95\xe3\x7f\x0d\x04\x83\x1a\x39\x68"
         "\xf5\x0a\x77\xb1\x3b\x81\x50\x59\x30\x21\xb3\x8b\xac\x68\xa9\xb8\xd7"
         "\x51\xfa\xf7\xda\x62\xb9\x59\xd4\x36\xd4\x00\x86\x57\x3a\x13\x19\xd3"
         "\x6c\x32\x31\xaa\x7a\xb6\x68\x5f\x21\xeb\xcb\x2b\xe2\x1d\xdf\x33\x49"
         "\xc9\xa6\x52\x4b\x4d\x72\x21\x17\x44\xe8\x17\x9c\xa6\x64\xe9\xbc\x23"
         "\x4c\xcb\xc9\xc2\x31\x0b\x8d\x25\x1f\xe1\x36\xe5\x0f\x24\x88\xb5\xe9"
         "\x4d\x2e\xaa\xff\x77\xf8\x80\x9f\x3e\xda\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         441);
  *(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;
}