// https://syzkaller.appspot.com/bug?id=ba7ddbcf4a8cefbab4afb8bcd2f931a801ea4d5c
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <pwd.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/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

static unsigned long long procid;

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_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 kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

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 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 void __attribute__((noinline)) remove_dir(const char* dir)
{
  DIR* dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EACCES) {
      if (rmdir(dir))
        exit(1);
      return;
    }
    exit(1);
  }
  struct dirent* ep = 0;
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    if (unlink(filename)) {
      exit(1);
    }
  }
  closedir(dp);
  while (rmdir(dir)) {
    exit(1);
  }
}

#define __syscall syscall

static void sandbox_common()
{
  if (setsid() == -1)
    exit(1);
  struct rlimit 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);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
}

static void loop();

static int do_sandbox_none(void)
{
  sandbox_common();
  loop();
  return 0;
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      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 < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

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

void execute_one(void)
{
  intptr_t res = 0;
  syscall(SYS_setsockopt, -1, 0x29, 0xd, 0ul, 0ul);
  res = syscall(SYS_socket, 2ul, 0x8005ul, 0x81);
  if (res != -1)
    r[0] = res;
  NONFAILING(memcpy(
      (void*)0x20000200,
      "\x51\x01\x2c\x49\xef\x77\xcb\x38\x7a\x89\x92\x35\xc4\x5e\xc1\xac\x12\x37"
      "\xdf\x85\x76\x69\x64\xcf\x23\x16\xe0\xd2\x89\xdd\x48\x2e\x8a\x84\xb1\x0d"
      "\xf2\x35\x23\x16\x25\x4d\x9e\x3a\xe0\x51\x82\x8a\x0f\xeb\xf3\x6f\xc2\xd0"
      "\x5c\xd1\xf7\x84\xda\x76\x9e\xd4\x74\x43\xbd\x75\x4e\x31\x22\x2d\x40\xd2"
      "\x79\xc7\x38\xe3\x76\x63\xdd\xb1\x08\x19\xb0\x32\x8c\x88\xe5\xbb\xe6\xf5"
      "\xb3\x8f\x04\x94\x31\x94\x41\xfd\x50\x48\x54\x4c\x79\x3d\x0e\x93\x34\xd5"
      "\x0d\xcd\xa5\x30\xf7\x6b\xe4\x59\x3e\xc7\x7b\xeb\x49\x3d\x7d\x23\x78\xcf"
      "\x11\x70\xfe\x52\x53\x5a\x50\x8f\x3e\x15\x26\xd6\x98\x18\x28\x98\xe9\xa3"
      "\xeb\xf5\xb1\x57\xa9\x18\xcd\x19\x84\x9b\xcd\x7f\xe6\xe5\x11\x5f\x81\x72"
      "\xc4\xd4\x35\x92\xe6\xbd\x1f\x00\xec\xd8\xa5\xd5\x5c\x89\xd2\x38\xb8\xa2"
      "\x35\xe9\x0f\x37\xdc\x7e\x4e\x54\x92\xbd\x95\x32\xb0\xee\x04\xda\x09\x30"
      "\x68\x84\xca\x20\xee\x8f\x33\xc5\xe5\x59",
      208));
  syscall(SYS_setsockopt, r[0], 1, 1, 0x20000200ul, 0xd0ul);
  NONFAILING(memcpy((void*)0x20000000, "./file0\000", 8));
  syscall(SYS_mknod, 0x20000000ul, 0x80002005ul,
          0x2d94); /* major = 45, minor = 148 */
  NONFAILING(memcpy((void*)0x20000040, "/dev/rvnd0c\000", 12));
  res = syscall(SYS_openat, 0xffffffffffffff9cul, 0x20000040ul, 0x40ul, 0ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint64_t*)0x20000180 = 0x20000100);
  NONFAILING(memcpy((void*)0x20000100, "./file0\000", 8));
  NONFAILING(*(uint64_t*)0x20000188 = 0x100000);
  NONFAILING(*(uint64_t*)0x20000190 = 0x20000140);
  NONFAILING(memcpy((void*)0x20000140, "./file0\000", 8));
  NONFAILING(*(uint32_t*)0x20000198 = 8);
  syscall(SYS_ioctl, r[1], 0xc0384600ul, 0x20000180ul);
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul);
  install_segv_handler();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}