// https://syzkaller.appspot.com/bug?id=a5c74eee04149854dd8b59fdfc0529a60be422a7
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <errno.h>
#include <fcntl.h>
#include <linux/capability.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/mman.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/wait.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}

#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static void use_temporary_dir()
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    fail("failed to mkdtemp");
  if (chmod(tmpdir, 0777))
    fail("failed to chmod");
  if (chdir(tmpdir))
    fail("failed to chdir");
}

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 = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 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);

  unshare(CLONE_NEWNS);
  unshare(CLONE_NEWIPC);
  unshare(CLONE_IO);
}

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) {
    close(fd);
    return false;
  }
  close(fd);
  return true;
}

static int real_uid;
static int real_gid;
__attribute__((aligned(64 << 10))) static char sandbox_stack[1 << 20];

static int namespace_sandbox_proc(void* arg)
{
  sandbox_common();

  write_file("/proc/self/setgroups", "deny");
  if (!write_file("/proc/self/uid_map", "0 %d 1\n", real_uid))
    fail("write of /proc/self/uid_map failed");
  if (!write_file("/proc/self/gid_map", "0 %d 1\n", real_gid))
    fail("write of /proc/self/gid_map failed");

  if (mkdir("./syz-tmp", 0777))
    fail("mkdir(syz-tmp) failed");
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    fail("mount(tmpfs) failed");
  if (mkdir("./syz-tmp/newroot", 0777))
    fail("mkdir failed");
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    fail("mkdir failed");
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL,
            MS_BIND | MS_REC | MS_PRIVATE, NULL))
    fail("mount(dev) failed");
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    fail("mkdir failed");
  if (mount(NULL, "./syz-tmp/newroot/proc", "proc", 0, NULL))
    fail("mount(proc) failed");
  if (mkdir("./syz-tmp/pivot", 0777))
    fail("mkdir failed");
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      fail("chdir failed");
  } else {
    if (chdir("/"))
      fail("chdir failed");
    if (umount2("./pivot", MNT_DETACH))
      fail("umount failed");
  }
  if (chroot("./newroot"))
    fail("chroot failed");
  if (chdir("/"))
    fail("chdir failed");

  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))
    fail("capget failed");
  cap_data[0].effective &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].permitted &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].inheritable &= ~(1 << CAP_SYS_PTRACE);
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    fail("capset failed");

  loop();
  doexit(1);
}

static int do_sandbox_namespace(int executor_pid, bool enable_tun)
{

  real_uid = getuid();
  real_gid = getgid();
  mprotect(sandbox_stack, 4096, PROT_NONE);
  return clone(
      namespace_sandbox_proc,
      &sandbox_stack[sizeof(sandbox_stack) - 64],
      CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWUTS | CLONE_NEWNET, NULL);
}

long r[45];
void loop()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  r[1] = syscall(__NR_socket, 0xaul, 0x1ul, 0x0ul);
  *(uint64_t*)0x20000000 = (uint64_t)0x0;
  *(uint64_t*)0x20000008 = (uint64_t)0x2000000000;
  *(uint32_t*)0x20000010 = (uint32_t)0x0;
  *(uint32_t*)0x20000014 = (uint32_t)0x3;
  *(uint32_t*)0x20000018 = (uint32_t)0x1;
  *(uint64_t*)0x20000020 = (uint64_t)0x4;
  *(uint64_t*)0x20000028 = (uint64_t)0x0;
  *(uint64_t*)0x20000030 = (uint64_t)0x0;
  *(uint64_t*)0x20000038 = (uint64_t)0x0;
  *(uint64_t*)0x20000040 = (uint64_t)0x0;
  *(uint32_t*)0x20000048 = (uint32_t)0x0;
  *(uint32_t*)0x2000004c = (uint32_t)0x0;
  *(uint32_t*)0x20000050 = (uint32_t)0x0;
  *(uint32_t*)0x20000054 = (uint32_t)0x0;
  r[16] = syscall(__NR_ioctl, 0xfffffffffffffffful, 0xc020660bul,
                  0x20000000ul);
  r[17] = syscall(__NR_ioctl, r[1], 0x8918ul, 0x20000000ul);
  r[18] = syscall(__NR_socket, 0x11ul, 0x3ul, 0x0ul);
  memcpy((void*)0x20155000, "\x20\x40\x01\x6f", 4);
  r[20] = syscall(__NR_setsockopt, r[18], 0x107ul, 0xful, 0x20155000ul,
                  0x4ul);
  *(uint64_t*)0x209bffab = (uint64_t)0x202b0000;
  *(uint32_t*)0x209bffb3 = (uint32_t)0x60;
  *(uint64_t*)0x209bffbb = (uint64_t)0x20886fe0;
  *(uint64_t*)0x209bffc3 = (uint64_t)0x2;
  *(uint64_t*)0x209bffcb = (uint64_t)0x208adf10;
  *(uint64_t*)0x209bffd3 = (uint64_t)0x10;
  *(uint32_t*)0x209bffdb = (uint32_t)0x0;
  *(uint16_t*)0x202b0000 = (uint16_t)0x27;
  *(uint32_t*)0x202b0004 = (uint32_t)0x4;
  *(uint32_t*)0x202b0008 = (uint32_t)0x0;
  *(uint32_t*)0x202b000c = (uint32_t)0x0;
  *(uint8_t*)0x202b0010 = (uint8_t)0x0;
  *(uint8_t*)0x202b0011 = (uint8_t)0x0;
  memcpy((void*)0x202b0012,
         "\xa2\x84\x02\x7e\x94\x77\x5b\xb0\xa6\x1c\x0a\x37\xf9\x8a\x86"
         "\xd1\x53\x9b\xce\xf0\x5a\x11\x31\x1b\x56\xeb\x8e\x51\x3a\xfa"
         "\x21\x84\x79\xb8\xc5\x41\x21\x27\x6c\x0a\x00\x67\x15\xb1\xdd"
         "\x24\xab\x77\xa3\x9e\xd8\xc2\xa4\xda\x5a\xb8\x2a\xfb\x82\x03"
         "\x30\xe4\xfe",
         63);
  *(uint64_t*)0x202b0058 = (uint64_t)0x4;
  *(uint64_t*)0x20886fe0 = (uint64_t)0x20ee7f29;
  *(uint64_t*)0x20886fe8 = (uint64_t)0xd7;
  *(uint64_t*)0x20886ff0 = (uint64_t)0x2050cf58;
  *(uint64_t*)0x20886ff8 = (uint64_t)0x0;
  memcpy((void*)0x20ee7f29,
         "\x06\x00\x00\x00\xac\xd8\xd2\xa9\xdb\x76\xdd\x0e\xe4\x02\xac"
         "\x94\xa2\xc0\x23\x07\xd7\xba\x52\x66\x4d\xaa\xdd\xcd\x66\xb0"
         "\x76\x5b\x4c\x31\xdd\x36\x7e\x8b\xb4\x50\x81\x9c\x5d\x65\xdb"
         "\x8f\x69\xfe\xbe\x99\xf8\x73\x82\xd7\x7e\xbe\x61\x19\x0f\x6d"
         "\xd7\x2c\x71\xf1\x1c\x7b\x86\xa0\xc8\x4d\x45\xa5\x6b\x35\x44"
         "\xba\xa5\xef\x88\x2e\x7f\x71\x25\x34\xc1\xe7\xe1\x8c\x83\x94"
         "\xdb\x6f\xe9\x39\x82\xfd\x04\xff\xed\x6c\x86\x00\x52\xba\x88"
         "\x64\x82\x8a\x38\x15\x60\x29\xce\x3a\x13\x0b\x93\x49\x0e\x0b"
         "\x48\x48\xf7\x04\x5a\x9e\x0c\x14\x1f\x54\xf1\x58\xb9\x7a\xca"
         "\x9a\x5b\x7b\xc2\x6a\x1b\x22\xae\xeb\x04\x89\x98\xd4\x17\xc4"
         "\x82\x8b\x00\xcf\xf9\xfb\x0b\xf7\x4f\x6d\x74\xf4\x85\xfb\x40"
         "\x40\x40\x13\x44\xab\x9c\x9a\x1e\x4b\xda\x65\x20\x64\x09\x79"
         "\x11\x5e\x45\x0b\x66\x7f\x20\xd9\xf6\x5c\x7a\xe8\xb2\x8c\xf1"
         "\xa7\x63\x74\x41\xa5\xb8\xfd\x5d\x0b\x54\x74\x9f\x84\xce\x4d"
         "\xbf\x1f\x24\x6a\xca",
         215);
  *(uint64_t*)0x208adf10 = (uint64_t)0x10;
  *(uint32_t*)0x208adf18 = (uint32_t)0x0;
  *(uint32_t*)0x208adf1c = (uint32_t)0x0;
  r[44] = syscall(__NR_sendmmsg, r[18], 0x209bffabul, 0x1ul, 0x0ul);
}

int main()
{
  use_temporary_dir();
  int pid = do_sandbox_namespace(0, false);
  int status = 0;
  while (waitpid(pid, &status, __WALL) != pid) {
  }
  return 0;
}