// https://syzkaller.appspot.com/bug?id=27d313ef3e5b11d1d75cb07a6e79d8fe76904e89
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.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/swap.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/falloc.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

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 int runcmdline(char* cmdline)
{
  int ret = system(cmdline);
  if (ret) {
  }
  return ret;
}

static void setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
  }
}

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 = 128 << 20;
  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)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  setup_binderfs();
  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);
  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);
    }
  }
}

static void setup_usb()
{
  if (chmod("/dev/raw-gadget", 0666))
    exit(1);
}

static void setup_sysctl()
{
  char mypid[32];
  snprintf(mypid, sizeof(mypid), "%d", getpid());
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", mypid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data))
      printf("write to %s failed: %s\n", files[i].name, strerror(errno));
  }
}

#define SWAP_FILE "./swap-file"
#define SWAP_FILE_SIZE (128 * 1000 * 1000)

static void setup_swap()
{
  swapoff(SWAP_FILE);
  unlink(SWAP_FILE);
  int fd = open(SWAP_FILE, O_CREAT | O_WRONLY | O_CLOEXEC, 0600);
  if (fd == -1) {
    exit(1);
    return;
  }
  fallocate(fd, FALLOC_FL_ZERO_RANGE, 0, SWAP_FILE_SIZE);
  close(fd);
  char cmdline[64];
  sprintf(cmdline, "mkswap %s", SWAP_FILE);
  if (runcmdline(cmdline)) {
    exit(1);
    return;
  }
  if (swapon(SWAP_FILE, SWAP_FLAG_PREFER) == 1) {
    exit(1);
    return;
  }
}

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  NONFAILING(*(uint32_t*)0x2000e000 = 0x10);
  NONFAILING(*(uint32_t*)0x2000e004 = 4);
  NONFAILING(*(uint64_t*)0x2000e008 = 0x20000040);
  NONFAILING(memcpy((void*)0x20000040,
                    "\xb4\x00\x00\x00\x00\x00\x00\x00\x79\x10\x48\x00\x00\x00"
                    "\x00\x00\x61\x04\x00\x00\x00\x00\x00\x00\x95\x00\x00\x00",
                    28));
  NONFAILING(*(uint64_t*)0x2000e010 = 0x20003ff6);
  NONFAILING(memcpy((void*)0x20003ff6, "GPL\000", 4));
  NONFAILING(*(uint32_t*)0x2000e018 = 2);
  NONFAILING(*(uint32_t*)0x2000e01c = 0xfd90);
  NONFAILING(*(uint64_t*)0x2000e020 = 0x2000cf3d);
  NONFAILING(*(uint32_t*)0x2000e028 = 0);
  NONFAILING(*(uint32_t*)0x2000e02c = 0);
  NONFAILING(memset((void*)0x2000e030, 0, 16));
  NONFAILING(*(uint32_t*)0x2000e040 = 0);
  NONFAILING(*(uint32_t*)0x2000e044 = 0);
  NONFAILING(*(uint32_t*)0x2000e048 = -1);
  NONFAILING(*(uint32_t*)0x2000e04c = 8);
  NONFAILING(*(uint64_t*)0x2000e050 = 0);
  NONFAILING(*(uint32_t*)0x2000e058 = 0);
  NONFAILING(*(uint32_t*)0x2000e05c = 0x10);
  NONFAILING(*(uint64_t*)0x2000e060 = 0);
  NONFAILING(*(uint32_t*)0x2000e068 = 0);
  NONFAILING(*(uint32_t*)0x2000e06c = 0);
  NONFAILING(*(uint32_t*)0x2000e070 = -1);
  NONFAILING(*(uint32_t*)0x2000e074 = 0);
  NONFAILING(*(uint64_t*)0x2000e078 = 0);
  NONFAILING(*(uint64_t*)0x2000e080 = 0);
  NONFAILING(*(uint32_t*)0x2000e088 = 0x10);
  NONFAILING(*(uint32_t*)0x2000e08c = 0);
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x2000e000ul, /*size=*/0x48ul);
  if (res != -1)
    r[0] = res;
  syscall(__NR_close, /*fd=*/r[0]);
  res = syscall(__NR_socketpair, /*domain=*/1ul, /*type=SOCK_DGRAM*/ 2ul,
                /*proto=*/0, /*fds=*/0x200010c0ul);
  if (res != -1)
    NONFAILING(r[1] = *(uint32_t*)0x200010c4);
  NONFAILING(*(uint32_t*)0x2000e000 = 0xe);
  NONFAILING(*(uint32_t*)0x2000e004 = 4);
  NONFAILING(*(uint64_t*)0x2000e008 = 0x20000540);
  NONFAILING(memcpy(
      (void*)0x20000540,
      "\xb4\x05\x00\x00\xfd\xff\x7f\x00\x61\x10\x58\x00\x00\x00\x00\x00\xc6\x00"
      "\x00\x00\x00\x00\x00\x00\x95\x00\x00\x00\x00\x00\x00\x00\x9f\x33\xef\x60"
      "\x91\x6e\x6e\x71\x3f\x1e\xeb\x0b\x72\x5a\xd9\x9b\x81\x7f\xd9\x8c\xd8\x24"
      "\x49\x89\x49\x71\x4f\xfa\xac\x8a\x6f\x77\x06\x00\x23\xca\x55\xf2\x1f\x3c"
      "\xa9\xe8\x22\xd1\x82\x05\x4d\x54\xd5\x3c\xd2\xb6\xdb\x71\x4e\x4b\xeb\x54"
      "\x47\x00\x00\x01\x00\x00\x00\x00\x8f\x2b\x90\x00\xf2\x24\x25\xe4\x09\x7e"
      "\xd6\x4d\xbc\x89\x10\x61\x01\x7c\xfa\x6f\xa2\x6f\xa7\x08\x8c\x60\x89\x7d"
      "\x4a\x61\x48\xa1\xc1\xe4\x3f\x00\x00\x1b\xde\x60\xbe\xac\x67\x1e\x8e\x8f"
      "\xde\xcb\x03\x58\x8a\xa6\x23\xed\x71\xf3\x1b\xf0\xf8\x71\xab\x5c\xaf\xf8"
      "\x8a\xfc\x60\x02\x7f\x4e\x5b\x52\x71\xed\x58\x09\x00\x00\x00\x00\x00\x00"
      "\x00\x98\xb5\x1f\xe6\xb1\xb8\xd9\xdb\xe8\x7d\xcf\xf4\x14\xed\x00\x00\x00"
      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x00\x00\x00\x00\x00\xb3\x47\xab\xe6\x35\x2a\x08\x0f\x81\x40\xe5\xfd"
      "\x10\x74\x7b\x6e\xcd\xb3\x54\x05\x46\xbf\x63\x6e\x3d\x6e\x70\x0e\x5b\x05"
      "\x00\x00\x00\x00\x00\x00\x00\xeb\x9e\x14\x03\xe6\xc8\xf7\xa1\x87\xea\xf6"
      "\x0f\x3a\x17\xf0\xf0\x46\xa3\x07\xa4\x03\xc1\x9d\x98\x29\xc9\x0b\xd2\x11"
      "\x42\x52\x58\x15\x67\xac\xae\x71\x5c\xbe\x1b\x57\xd5\xcd\xa4\x32\xc5\xb9"
      "\x10\x40\x06\x23\xd6\x41\x95\x40\x5f\x2e\x76\xcc\xb7\xb3\x7b\x41\x21\x5c"
      "\x18\x4e\x73\x1f\xb1",
      329));
  NONFAILING(*(uint64_t*)0x2000e010 = 0x20003ff6);
  NONFAILING(memcpy((void*)0x20003ff6, "GPL\000", 4));
  NONFAILING(*(uint32_t*)0x2000e018 = 4);
  NONFAILING(*(uint32_t*)0x2000e01c = 0xfd90);
  NONFAILING(*(uint64_t*)0x2000e020 = 0x2000cf3d);
  NONFAILING(*(uint32_t*)0x2000e028 = 0);
  NONFAILING(*(uint32_t*)0x2000e02c = 0);
  NONFAILING(memset((void*)0x2000e030, 0, 16));
  NONFAILING(*(uint32_t*)0x2000e040 = 0);
  NONFAILING(*(uint32_t*)0x2000e044 = 0);
  NONFAILING(*(uint32_t*)0x2000e048 = -1);
  NONFAILING(*(uint32_t*)0x2000e04c = 8);
  NONFAILING(*(uint64_t*)0x2000e050 = 0x20000000);
  NONFAILING(*(uint32_t*)0x20000000 = 0);
  NONFAILING(*(uint32_t*)0x20000004 = 0);
  NONFAILING(*(uint32_t*)0x2000e058 = 0x366);
  NONFAILING(*(uint32_t*)0x2000e05c = 0x10);
  NONFAILING(*(uint64_t*)0x2000e060 = 0x20000000);
  NONFAILING(*(uint32_t*)0x20000000 = 0);
  NONFAILING(*(uint32_t*)0x20000004 = 0);
  NONFAILING(*(uint32_t*)0x20000008 = 0);
  NONFAILING(*(uint32_t*)0x2000000c = 0);
  NONFAILING(*(uint32_t*)0x2000e068 = 0x1dd);
  NONFAILING(*(uint32_t*)0x2000e06c = 0);
  NONFAILING(*(uint32_t*)0x2000e070 = -1);
  NONFAILING(*(uint32_t*)0x2000e074 = 0);
  NONFAILING(*(uint64_t*)0x2000e078 = 0);
  NONFAILING(*(uint64_t*)0x2000e080 = 0);
  NONFAILING(*(uint32_t*)0x2000e088 = 0x10);
  NONFAILING(*(uint32_t*)0x2000e08c = 0);
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x2000e000ul, /*size=*/0x48ul);
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint32_t*)0x20000200 = 0xf);
  NONFAILING(*(uint32_t*)0x20000204 = 4);
  NONFAILING(*(uint32_t*)0x20000208 = 4);
  NONFAILING(*(uint32_t*)0x2000020c = 0x12);
  NONFAILING(*(uint32_t*)0x20000210 = 0);
  NONFAILING(*(uint32_t*)0x20000214 = -1);
  NONFAILING(*(uint32_t*)0x20000218 = 0);
  NONFAILING(memset((void*)0x2000021c, 0, 16));
  NONFAILING(*(uint32_t*)0x2000022c = 0);
  NONFAILING(*(uint32_t*)0x20000230 = -1);
  NONFAILING(*(uint32_t*)0x20000234 = 0);
  NONFAILING(*(uint32_t*)0x20000238 = 0);
  NONFAILING(*(uint32_t*)0x2000023c = 0);
  NONFAILING(*(uint64_t*)0x20000240 = 0);
  res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x20000200ul, /*size=*/0x48ul);
  if (res != -1)
    r[3] = res;
  NONFAILING(*(uint32_t*)0x20000080 = r[3]);
  NONFAILING(*(uint32_t*)0x20000084 = r[2]);
  NONFAILING(*(uint32_t*)0x20000088 = 0x26);
  NONFAILING(*(uint32_t*)0x2000008c = 0);
  NONFAILING(*(uint32_t*)0x20000090 = 0);
  NONFAILING(*(uint32_t*)0x20000094 = -1);
  NONFAILING(*(uint64_t*)0x20000098 = 0);
  syscall(__NR_bpf, /*cmd=*/8ul, /*arg=*/0x20000080ul, /*size=*/0x10ul);
  NONFAILING(*(uint32_t*)0x200000c0 = r[3]);
  NONFAILING(*(uint64_t*)0x200000c8 = 0x20000000);
  NONFAILING(*(uint32_t*)0x20000000 = 0);
  NONFAILING(*(uint64_t*)0x200000d0 = 0x20000080);
  NONFAILING(*(uint32_t*)0x20000080 = r[0]);
  NONFAILING(*(uint64_t*)0x200000d8 = 0);
  syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0x200000c0ul, /*size=*/0x20ul);
  NONFAILING(*(uint64_t*)0x20000500 = 0);
  NONFAILING(*(uint32_t*)0x20000508 = 0);
  NONFAILING(*(uint64_t*)0x20000510 = 0);
  NONFAILING(*(uint64_t*)0x20000518 = 0);
  NONFAILING(*(uint64_t*)0x20000520 = 0);
  NONFAILING(*(uint64_t*)0x20000528 = 0);
  NONFAILING(*(uint32_t*)0x20000530 = 0);
  inject_fault(5);
  syscall(__NR_sendmsg, /*fd=*/r[1], /*msg=*/0x20000500ul, /*f=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  setup_sysctl();
  setup_fault();
  setup_usb();
  setup_swap();
  install_segv_handler();
  use_temporary_dir();
  do_sandbox_none();
  return 0;
}