// https://syzkaller.appspot.com/bug?id=5bbec74cb4d7b4ae0ac1e45d4a965fdaa3413422
// 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;
}

#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);
  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 < MAX_FDS; fd++)
    close(fd);
}

uint64_t r[1] = {0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  *(uint64_t*)0x20005c00 = 0;
  *(uint32_t*)0x20005c08 = 0xfffffd95;
  *(uint64_t*)0x20005c10 = 0;
  *(uint64_t*)0x20005c18 = 0;
  *(uint64_t*)0x20005c20 = 0x20000840;
  memcpy(
      (void*)0x20000840,
      "\x18\x00\x00\x00\x00\x00\x00\x00\x10\x01\x00\x00\x01\x00\x00\x00\x05\xe8"
      "\x00\x00\x00\x00\x00\x00\xe5\x58\xc5\x98\x6f\x00\x00\x00\x00\x00\x00\x51"
      "\x57\x81\xae\x36\xa4\xd1\x48\xf2\x69\x39\x90\xf1\x00\xce\x7e\xc3\xb6\xd9"
      "\xbf\xb4\x5e\x25\x84\xf4\x46\x72\x20\x53\xf1\x50\x25\x98\x80\x8b\x35\x5f"
      "\x7b\x81\x5b\xdb\x22\xaa\x86\xdd\xdc\x01\x87\xf8\x94\xde\x7e\x81\x14\x5d"
      "\xd6\x88\x75\x99\x44\xbd\x09\xb0\xf5\x5e\x7c\xa5\x4b\x07\xbd\x91\x89\xde"
      "\x8d\xef\xce\xa2\x27\xe5\x6f\x94\xdd\xc8\xd5\xe0\x2f\x38\xfd\xcd\xad\x2e"
      "\x5c\xc2\x2b\x1f\x09\x0e\xcf\x60\x60\x5f\xa2\x6c\x0e\x48\xa8\x0a\x6b\xd5"
      "\x44\xfa\x30\x0d\x06\x6a\x4d\x16\x2d\x7e\xf8\x50\x02\x02\x4f\xaf\x08\x31"
      "\xff\xfb\xb5\xf1\xa1\x2a\x6f\x5f\x15\x8a\x75\x2e\xaf\x25\xa8\x59\xb4\x0a"
      "\x57\x38\x11\x47\x7c\xea\xe3\x03\x04\x78\x3f\xd7\xf2\xee\xc7\x9c\x49\xb6"
      "\x9a\x61\x28\x7b\x59\x13\x71\xf3\xf6\x0b\x34\x47\x06\x92\x21\x7a\x89\x30"
      "\xa1\x1f\x0e\x0c\x79\x6c\x58\x7d\xa2\x35\xe7\xed\x34\xce\x84\x48\x27\x03"
      "\x3a\x3b\xac\x99\xab\x94\x98\xf9\x44\xfe\xc7\x30\x01\xfd\x8b\xe2\xb4\xb3"
      "\x6b\x0b\x3c\x96\x72\xaf\x72\x78\x31\x27\x50\x17\xa6\xd5\xaf\xf5\x0c\x09"
      "\x67\xc2\x2e\xbf\x54\x89\x06\x13\x8e\x7d\xae\x98\xda\x3b\x8a\x39\xbf\x88"
      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x2a\x02\x5f\x9c\x75\xc0\xd3"
      "\x7e\x26\xe9\x7c\x7b\xd4\x38\x00\x00\x00\x00\x33\x9b\x56\x7e\x58\x68\x9a"
      "\x4d\xa6\x4c\xf3\x1b\x4e\xa5\x06\x61\x03\xba\x67\x0c\x27\x72\xb5\x48\xc8"
      "\xf1\x38\xaf\x70\x29\xf1\x22\x69\x01\xc8\x6f\x51\x0b\x46\xe3\xa0\x27\xd6"
      "\x13\x5f\x99\xb5\x85\xd0\xaa\x73\xb7\xe0\x29\xda\x59\x1c\xd8\xe7\x44\x8f"
      "\x10\x73\x36\xed\x8a\x46\xa3\x59\x36\xd5\xa2\x4a\x92\xa4\xe2\xbe\x4b\x78"
      "\xca\x3d\x30\x4e\x40\xf3\x93\x13\x19\xf8\xb3\xe3\xf6\xfe\xeb\xfd\xce\xfa"
      "\x89\x4f\x5b\x25\x37\xfa\x42\x34\x00\x00\x00\x00\x09\xf9\xd5\x9d\x9c\xea"
      "\x49\x94\x21\xdd\x61\x06\x25\xcd\x37\x03\xc9\x03\x3a\x2c\xd0\x34\x7c\xa0"
      "\xbe\xea\xdd\x0c\x65\x0c\x92\xb2\xba\x97\x41\x4f\x3f\xae\xc7\xf5\x0d\x39"
      "\x30\xd4\x16\x90\x77\x10\x13\xe5\x51\x43\xd7",
      479);
  *(uint64_t*)0x20005c28 = 0x18;
  *(uint32_t*)0x20005c30 = 0;
  *(uint32_t*)0x20005c38 = 0;
  syscall(__NR_sendmmsg, -1, 0x20005c00ul, 1ul, 0ul);
  res = syscall(__NR_socket, 0x2000000000000021ul, 2ul, 2);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20000180 = 0x21;
  *(uint16_t*)0x20000182 = 0;
  *(uint16_t*)0x20000184 = 2;
  *(uint16_t*)0x20000186 = 0x10;
  *(uint16_t*)0x20000188 = 2;
  *(uint16_t*)0x2000018a = htobe16(0);
  *(uint32_t*)0x2000018c = htobe32(0);
  syscall(__NR_connect, r[0], 0x20000180ul, 0x24ul);
  syscall(__NR_sendmmsg, r[0], 0x20005c00ul, 0x40000000000037bul, 0ul);
  close_fds();
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0);
  do_sandbox_none();
  return 0;
}