// https://syzkaller.appspot.com/bug?id=6dcd14a729df98f989c7b76d254226ae67084efd
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>

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

#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/stat.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);
}

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

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()
{
  while (1) {
    test();
  }
}

long r[1];
uint64_t procid;
void test()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000, 0xfff000, 0x3, 0x32, 0xffffffff, 0x0);
  NONFAILING(memcpy((void*)0x20000000, "/dev/sg#", 9));
  r[0] = syz_open_dev(0x20000000, 0x0, 0x2);
  NONFAILING(*(uint64_t*)0x20001000 = 0x0);
  NONFAILING(*(uint64_t*)0x20001008 = 0x6);
  NONFAILING(*(uint16_t*)0x20001010 = 0x0);
  NONFAILING(*(uint16_t*)0x20001012 = 0x0);
  NONFAILING(*(uint32_t*)0x20001014 = 0x0);
  NONFAILING(*(uint64_t*)0x20001018 = 0x0);
  NONFAILING(*(uint64_t*)0x20001020 = 0x0);
  NONFAILING(*(uint16_t*)0x20001028 = 0x0);
  NONFAILING(*(uint16_t*)0x2000102a = 0x0);
  NONFAILING(*(uint32_t*)0x2000102c = 0x4);
  NONFAILING(*(uint64_t*)0x20001030 = 0x0);
  NONFAILING(*(uint64_t*)0x20001038 = 0x2710);
  NONFAILING(*(uint16_t*)0x20001040 = 0x0);
  NONFAILING(*(uint16_t*)0x20001042 = 0x0);
  NONFAILING(*(uint32_t*)0x20001044 = 0x0);
  NONFAILING(*(uint64_t*)0x20001048 = 0x0);
  NONFAILING(*(uint64_t*)0x20001050 = 0x2710);
  NONFAILING(*(uint16_t*)0x20001058 = 0x0);
  NONFAILING(*(uint16_t*)0x2000105a = 0x0);
  NONFAILING(*(uint32_t*)0x2000105c = 0x0);
  syscall(__NR_write, r[0], 0x20001000, 0x60);
  NONFAILING(*(uint64_t*)0x2064f000 = 0x20eeb000);
  NONFAILING(*(uint64_t*)0x2064f008 = 0x20);
  syscall(__NR_readv, r[0], 0x2064f000, 0x1);
}

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