// https://syzkaller.appspot.com/bug?id=784642714f2a76fa0784c489a8a0a239fcc00696
// 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);
  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 (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  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);
}

static 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 int inject_fault(int nth)
{
  int fd;
  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exit(1);
  char buf[16];
  sprintf(buf, "%d", nth + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

static void setup_fault()
{
  static struct {
    const char* file;
    const char* val;
    bool fatal;
  } files[] = {
      {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
      {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
  };
  unsigned i;
  for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].file, files[i].val)) {
      if (files[i].fatal)
        exit(1);
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x26ul, 5ul, 0);
  if (res != -1)
    r[0] = res;
  *(uint16_t*)0x20000180 = 0x26;
  memcpy((void*)0x20000182, "skcipher\000\000\000\000\000\000", 14);
  *(uint32_t*)0x20000190 = 0;
  *(uint32_t*)0x20000194 = 0;
  memcpy((void*)0x20000198,
         "xts(aes)"
         "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000",
         64);
  syscall(__NR_bind, r[0], 0x20000180ul, 0x58ul);
  memcpy((void*)0x200000c0,
         "\xb7\xf2\x28\x8a\x91\x19\x93\xf0\x26\x5d\xf5\xcf\x1c\xdd\x8b\x55\xb0"
         "\x62\x95\x0b\x86\xbc\x01\xab\xc8\x46\x4d\x4f\x8a\x90\x61\x51",
         32);
  syscall(__NR_setsockopt, r[0], 0x117, 1, 0x200000c0ul, 0x20ul);
  res = syscall(__NR_accept, r[0], 0ul, 0ul);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x20003f00 = 0;
  *(uint32_t*)0x20003f08 = 0;
  *(uint64_t*)0x20003f10 = 0x20000040;
  *(uint64_t*)0x20000040 = 0x20000200;
  memcpy((void*)0x20000200,
         "\x16\x31\x0e\xd3\x36\xb6\x29\xfa\x24\x70\x21\xaf\x20\xd6\xfe\xa1\x1c"
         "\x41\x3b\x89\x8c\x64\x5c\x1a\x07\x72\xd5\xf8\xa6\xe8\x5c\xe5\x17\xb3"
         "\x1e\xef\x2d\x22\xb4\x39\xa0\x0f\xb1\x39\xd4\x45\xdd\x69\x62\x3c\x64"
         "\x16\x91\x3c\xc4\x5e\x30\xb0\x00\xd9\xce\xfa\x3d\x29",
         64);
  *(uint64_t*)0x20000048 = 0x40;
  *(uint64_t*)0x20003f18 = 1;
  *(uint64_t*)0x20003f20 = 0;
  *(uint64_t*)0x20003f28 = 0;
  *(uint32_t*)0x20003f30 = 0;
  syscall(__NR_sendmmsg, r[1], 0x20003f00ul, 1ul, 0ul);
  *(uint64_t*)0x20001f40 = 0;
  *(uint32_t*)0x20001f48 = 0;
  *(uint64_t*)0x20001f50 = 0x20001440;
  *(uint64_t*)0x20001440 = 0x20000000;
  *(uint64_t*)0x20001448 = 0x19;
  *(uint64_t*)0x20001450 = 0x20000280;
  *(uint64_t*)0x20001458 = 0xb8;
  *(uint64_t*)0x20001f58 = 2;
  *(uint64_t*)0x20001f60 = 0;
  *(uint64_t*)0x20001f68 = 0;
  *(uint32_t*)0x20001f70 = 0;
  *(uint32_t*)0x20001f78 = 0;
  inject_fault(5);
  syscall(__NR_recvmmsg, r[1], 0x20001f40ul, 1ul, 0ul, 0ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  setup_fault();
  do_sandbox_none();
  return 0;
}