// https://syzkaller.appspot.com/bug?id=d932bb61fb530dc6816b87b4649f3b6925f51026
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

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

#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <string.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 __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
  for (;;) {
  }
}

static void install_segv_handler()
{
  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(...)                                                \
  {                                                                    \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);               \
    if (_setjmp(segv_env) == 0) {                                      \
      __VA_ARGS__;                                                     \
    }                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);               \
  }

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block",
            (uint8_t)a1, (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    NONFAILING(strncpy(buf, (char*)a0, sizeof(buf)));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

static void test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
  }
}

long r[26];
void test()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  NONFAILING(memcpy((void*)0x2030efee,
                    "\x2f\x64\x65\x76\x2f\x6c\x6f\x6f\x70\x2d\x63\x6f"
                    "\x6e\x74\x72\x6f\x6c\x00",
                    18));
  r[2] = syscall(__NR_openat, 0xffffffffffffff9cul, 0x2030efeeul,
                 0x20000ul, 0x0ul);
  NONFAILING(*(uint32_t*)0x20805ffc = (uint32_t)0x4);
  r[4] = syscall(__NR_getsockopt, 0xfffffffffffffffful, 0x11ul, 0x0ul,
                 0x20257000ul, 0x20805ffcul);
  r[5] = syscall(__NR_ioctl, r[2], 0x4c82ul);
  NONFAILING(*(uint32_t*)0x209dcff4 = (uint32_t)0x0);
  NONFAILING(*(uint32_t*)0x209dcff8 = (uint32_t)0x4360);
  NONFAILING(*(uint16_t*)0x209dcffc = (uint16_t)0x30);
  NONFAILING(*(uint32_t*)0x203fc000 = (uint32_t)0xc);
  r[10] = syscall(__NR_getsockopt, 0xfffffffffffffffful, 0x84ul, 0x72ul,
                  0x209dcff4ul, 0x203fc000ul);
  if (r[10] != -1)
    NONFAILING(r[11] = *(uint32_t*)0x209dcff4);
  NONFAILING(*(uint32_t*)0x20cc3000 = r[11]);
  NONFAILING(*(uint16_t*)0x20cc3004 = (uint16_t)0xff);
  NONFAILING(*(uint16_t*)0x20cc3006 = (uint16_t)0x0);
  NONFAILING(*(uint32_t*)0x20cc3008 = (uint32_t)0x9);
  NONFAILING(*(uint32_t*)0x20cc300c = (uint32_t)0xb8b);
  NONFAILING(*(uint32_t*)0x20cc3010 = (uint32_t)0x1ff);
  r[18] = syscall(__NR_setsockopt, 0xfffffffffffffffful, 0x84ul, 0x1ul,
                  0x20cc3000ul, 0x14ul);
  NONFAILING(*(uint32_t*)0x204d0ffc = (uint32_t)0x0);
  r[20] = syscall(__NR_ioctl, 0xfffffffffffffffful, 0x400454cbul,
                  0x204d0ffcul);
  NONFAILING(*(uint32_t*)0x20155ffc = (uint32_t)0x14);
  r[22] = syscall(__NR_getsockname, 0xfffffffffffffffful, 0x20507ff1ul,
                  0x20155ffcul);
  NONFAILING(memcpy((void*)0x2086eff5,
                    "\x2f\x64\x65\x76\x2f\x6c\x6f\x6f\x70\x23\x00",
                    11));
  r[24] = syz_open_dev(0x2086eff5ul, 0xffful, 0x101081ul);
  r[25] = syscall(__NR_ioctl, r[2], 0x4c81ul, r[5]);
}

int main()
{
  int i;
  for (i = 0; i < 8; i++) {
    if (fork() == 0) {
      install_segv_handler();
      loop();
      return 0;
    }
  }
  sleep(1000000);
  return 0;
}