// https://syzkaller.appspot.com/bug?id=d4aa3b37520a28ee882cb07bf3a22e59389f4e97
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.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/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  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 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 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);
    }
  }
}

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

int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  setup_fault();
  install_segv_handler();
  intptr_t res = 0;
  res = syscall(__NR_socket, 0xaul, 1ul, 0);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x200000c0 = 1);
  syscall(__NR_setsockopt, r[0], 6, 0x13, 0x200000c0ul, 0x1d4ul);
  NONFAILING(*(uint16_t*)0x20000080 = 0xa);
  NONFAILING(*(uint16_t*)0x20000082 = htobe16(0));
  NONFAILING(*(uint32_t*)0x20000084 = htobe32(0));
  NONFAILING(memcpy(
      (void*)0x20000088,
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000", 16));
  NONFAILING(*(uint32_t*)0x20000098 = 0);
  syscall(__NR_connect, r[0], 0x20000080ul, 0x1cul);
  NONFAILING(memcpy((void*)0x200001c0, "tls\000", 4));
  syscall(__NR_setsockopt, r[0], 6, 0x1f, 0x200001c0ul, 4ul);
  syscall(__NR_shutdown, r[0], 1ul);
  NONFAILING(*(uint16_t*)0x20000040 = 0x303);
  NONFAILING(*(uint16_t*)0x20000042 = 0x33);
  NONFAILING(memcpy((void*)0x20000044, "\x44\xcd\x83\x8e\x7e\xb1\x03\x58", 8));
  NONFAILING(memcpy(
      (void*)0x2000004c,
      "\xab\x5c\x29\x19\xe9\x9c\x1f\x8b\x1e\x48\xbc\x3e\x4f\xb1\x34\xb6", 16));
  NONFAILING(memcpy((void*)0x2000005c, "\xd3\x10\x62\x4b", 4));
  NONFAILING(memcpy((void*)0x20000060, "\x64\x44\xef\x86\x78\x48\x2c\xaf", 8));
  syscall(__NR_setsockopt, r[0], 0x11a, 1, 0x20000040ul, 0x28ul);
  NONFAILING(memcpy((void*)0x200005c0, "/proc/self/exe\000", 15));
  res = syscall(__NR_openat, 0xffffff9c, 0x200005c0ul, 0ul, 0ul);
  if (res != -1)
    r[1] = res;
  syscall(__NR_mmap, 0x20000000ul, 0x800000ul, 0x2800004ul, 0x12ul, r[1], 0ul);
  NONFAILING(memcpy((void*)0x20000180, "Y", 1));
  inject_fault(3);
  syscall(__NR_sendto, r[0], 0x20000180ul, 1ul, 0x4000ul, 0ul, 0ul);
  return 0;
}