// https://syzkaller.appspot.com/bug?id=44f8b2235e763b79f247e3f273ff85e700656526
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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 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 kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

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);
    }
  }
}

#define KMEMLEAK_FILE "/sys/kernel/debug/kmemleak"

static void setup_leak()
{
  if (!write_file(KMEMLEAK_FILE, "scan"))
    exit(1);
  sleep(5);
  if (!write_file(KMEMLEAK_FILE, "scan"))
    exit(1);
  if (!write_file(KMEMLEAK_FILE, "clear"))
    exit(1);
}

static void check_leaks(void)
{
  int fd = open(KMEMLEAK_FILE, O_RDWR);
  if (fd == -1)
    exit(1);
  uint64_t start = current_time_ms();
  if (write(fd, "scan", 4) != 4)
    exit(1);
  sleep(1);
  while (current_time_ms() - start < 4 * 1000)
    sleep(1);
  if (write(fd, "scan", 4) != 4)
    exit(1);
  static char buf[128 << 10];
  ssize_t n = read(fd, buf, sizeof(buf) - 1);
  if (n < 0)
    exit(1);
  int nleaks = 0;
  if (n != 0) {
    sleep(1);
    if (write(fd, "scan", 4) != 4)
      exit(1);
    if (lseek(fd, 0, SEEK_SET) < 0)
      exit(1);
    n = read(fd, buf, sizeof(buf) - 1);
    if (n < 0)
      exit(1);
    buf[n] = 0;
    char* pos = buf;
    char* end = buf + n;
    while (pos < end) {
      char* next = strstr(pos + 1, "unreferenced object");
      if (!next)
        next = end;
      char prev = *next;
      *next = 0;
      fprintf(stderr, "BUG: memory leak\n%s\n", pos);
      *next = prev;
      pos = next;
      nleaks++;
    }
  }
  if (write(fd, "clear", 5) != 5)
    exit(1);
  close(fd);
  if (nleaks)
    exit(1);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    check_leaks();
  }
}

uint64_t r[3] = {0x0, 0x0, 0x0};

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x20000140, "user\000", 5);
  memcpy((void*)0x20000180, "syz", 3);
  *(uint8_t*)0x20000183 = 0x21;
  *(uint8_t*)0x20000184 = 0;
  memcpy((void*)0x20000740,
         "\x76\x85\x42\x78\x01\xbf\x90\x10\x06\x30\x37\x78\x09\x53\xc8\x4a\x64"
         "\x66\x31\x71\x2c\xda\x94\x31\x46\xfb\x57\x01\x15\x93\x1d\xd1\x99\x3f"
         "\x80\x43\xb7\x88\xd2\xce\xfc\xb5\x15\x3d\x20\xb4\xe6\x32\x69\x7c\x97"
         "\x19\x35\x02\xdf\x6d\xea\xe7\xb4\x65\xab\xb4\xc9\x21\x95\x5f\xb6\x08"
         "\x62\x44\x11\x31\x82\xb8\xf3\x13\x59\x3c\x4f\x22\x6e\xb6\x13\xcd\x11"
         "\x6c\xa4\xa3\x88\xa9\x78\x2d\x21\x5e\x58\x84\xf5\x2b\x2d\x77\x74\x30"
         "\x51\xd5\x21\x01\xea\x9e\x6b\x5f\x47\x32\xa3\x00\x1b\xd2\x38\x96\x02"
         "\x00\xba\xcf\x7a\x82\xf5\xb4\xed\x47\x00\x00\xe2\x8d\x20\xa1\xb6\x33"
         "\x16\x03\x34\xad\xbc\xc9\x16\x65\xae\x6e\x37\xb5\x24\x6b\x01\x38\x94",
         153);
  res = syscall(__NR_add_key, 0x20000140, 0x20000180, 0x20000740, 0x99,
                0xfffffffd);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x200006c0, "user\000", 5);
  memcpy((void*)0x20000000, "syz", 3);
  *(uint8_t*)0x20000003 = 0;
  *(uint8_t*)0x20000004 = 0;
  memcpy((void*)0x20000700, "X", 1);
  res =
      syscall(__NR_add_key, 0x200006c0, 0x20000000, 0x20000700, 1, 0xfffffffe);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x20000200, "user\000", 5);
  memcpy((void*)0x200005c0, "syz", 3);
  *(uint8_t*)0x200005c3 = 0;
  *(uint8_t*)0x200005c4 = 0;
  res = syscall(__NR_add_key, 0x20000200, 0x200005c0, 0x200000c0, 0x390,
                0xfffffffd);
  if (res != -1)
    r[2] = res;
  *(uint32_t*)0x20000080 = r[1];
  *(uint32_t*)0x20000084 = r[2];
  *(uint32_t*)0x20000088 = r[0];
  *(uint64_t*)0x200001c0 = 0x20000040;
  memcpy((void*)0x20000040, "crct10dif\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);
  *(uint64_t*)0x200001c8 = 0;
  *(uint32_t*)0x200001d0 = 0;
  *(uint32_t*)0x200001d4 = 0;
  *(uint32_t*)0x200001d8 = 0;
  *(uint32_t*)0x200001dc = 0;
  *(uint32_t*)0x200001e0 = 0;
  *(uint32_t*)0x200001e4 = 0;
  *(uint32_t*)0x200001e8 = 0;
  *(uint32_t*)0x200001ec = 0;
  *(uint32_t*)0x200001f0 = 0;
  inject_fault(26);
  syscall(__NR_keyctl, 0x17, 0x20000080, 0, 0, 0x200001c0);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  setup_leak();
  setup_fault();
  loop();
  return 0;
}