// https://syzkaller.appspot.com/bug?id=c4117efdec586bbccac5428cce624863690bd3b8
// 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;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _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(...)                                                        \
  {                                                                            \
    __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 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 long syz_open_dev(volatile long a0, volatile long a1, volatile long 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) - 1));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

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[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  setup_fault();
  install_segv_handler();
  intptr_t res = 0;
  syscall(__NR_perf_event_open, 0, 0, -1, -1, 0);
  res = syz_open_dev(0, 0, 0);
  if (res != -1)
    r[0] = res;
  syscall(__NR_sysinfo, 0);
  syscall(__NR_pipe2, 0, 0x4000);
  res = syscall(__NR_openat, 0xffffffffffffff9c, 0, 2, 0);
  if (res != -1)
    r[1] = res;
  syscall(__NR_write, r[1], 0, 0);
  syscall(__NR_ioctl, r[0], 0x1269, 0);
  syz_open_dev(0, 0xfffffffffffffff9, 0);
  res = syscall(__NR_socket, 2, 2, 0);
  if (res != -1)
    r[2] = res;
  syscall(__NR_setsockopt, r[2], 0, 0x12, 0, 0);
  syscall(__NR_sendto, r[2], 0, 0, 0, 0, 0);
  syscall(__NR_setsockopt, r[2], 0, 0x17, 0, 0);
  syscall(__NR_recvmmsg, r[2], 0, 0, 0x12001, 0);
  syscall(__NR_writev, r[2], 0, 0);
  NONFAILING(memcpy((void*)0x20000580, "/dev/infiniband/rdma_cm\000", 24));
  res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000580, 2, 0);
  if (res != -1)
    r[3] = res;
  NONFAILING(*(uint32_t*)0x200001c0 = 0);
  NONFAILING(*(uint16_t*)0x200001c4 = 0x18);
  NONFAILING(*(uint16_t*)0x200001c6 = 0xfa00);
  NONFAILING(*(uint64_t*)0x200001c8 = 0);
  NONFAILING(*(uint64_t*)0x200001d0 = 0x20000140);
  NONFAILING(*(uint16_t*)0x200001d8 = 2);
  NONFAILING(*(uint8_t*)0x200001da = 0);
  NONFAILING(*(uint8_t*)0x200001db = 0);
  NONFAILING(*(uint8_t*)0x200001dc = 0);
  NONFAILING(*(uint8_t*)0x200001dd = 0);
  NONFAILING(*(uint8_t*)0x200001de = 0);
  NONFAILING(*(uint8_t*)0x200001df = 0);
  res = syscall(__NR_write, r[3], 0x200001c0, 0x20);
  if (res != -1)
    NONFAILING(r[4] = *(uint32_t*)0x20000140);
  NONFAILING(*(uint32_t*)0x20000200 = 3);
  NONFAILING(*(uint16_t*)0x20000204 = 0x40);
  NONFAILING(*(uint16_t*)0x20000206 = 0xfa00);
  NONFAILING(*(uint16_t*)0x20000208 = 0xa);
  NONFAILING(*(uint16_t*)0x2000020a = htobe16(2));
  NONFAILING(*(uint32_t*)0x2000020c = htobe32(0));
  NONFAILING(*(uint8_t*)0x20000210 = 0);
  NONFAILING(*(uint8_t*)0x20000211 = 0);
  NONFAILING(*(uint8_t*)0x20000212 = 0);
  NONFAILING(*(uint8_t*)0x20000213 = 0);
  NONFAILING(*(uint8_t*)0x20000214 = 0);
  NONFAILING(*(uint8_t*)0x20000215 = 0);
  NONFAILING(*(uint8_t*)0x20000216 = 0);
  NONFAILING(*(uint8_t*)0x20000217 = 0);
  NONFAILING(*(uint8_t*)0x20000218 = 0);
  NONFAILING(*(uint8_t*)0x20000219 = 0);
  NONFAILING(*(uint8_t*)0x2000021a = 0);
  NONFAILING(*(uint8_t*)0x2000021b = 0);
  NONFAILING(*(uint8_t*)0x2000021c = 0);
  NONFAILING(*(uint8_t*)0x2000021d = 0);
  NONFAILING(*(uint8_t*)0x2000021e = 0);
  NONFAILING(*(uint8_t*)0x2000021f = 0);
  NONFAILING(*(uint32_t*)0x20000220 = 0);
  NONFAILING(*(uint16_t*)0x20000224 = 0xa);
  NONFAILING(*(uint16_t*)0x20000226 = htobe16(0));
  NONFAILING(*(uint32_t*)0x20000228 = htobe32(0));
  NONFAILING(*(uint8_t*)0x2000022c = 0xfe);
  NONFAILING(*(uint8_t*)0x2000022d = 0x80);
  NONFAILING(*(uint8_t*)0x2000022e = 0);
  NONFAILING(*(uint8_t*)0x2000022f = 0);
  NONFAILING(*(uint8_t*)0x20000230 = 0);
  NONFAILING(*(uint8_t*)0x20000231 = 0);
  NONFAILING(*(uint8_t*)0x20000232 = 0);
  NONFAILING(*(uint8_t*)0x20000233 = 0);
  NONFAILING(*(uint8_t*)0x20000234 = 0);
  NONFAILING(*(uint8_t*)0x20000235 = 0);
  NONFAILING(*(uint8_t*)0x20000236 = 0);
  NONFAILING(*(uint8_t*)0x20000237 = 0);
  NONFAILING(*(uint8_t*)0x20000238 = 0);
  NONFAILING(*(uint8_t*)0x20000239 = 0);
  NONFAILING(*(uint8_t*)0x2000023a = 0);
  NONFAILING(*(uint8_t*)0x2000023b = 0xaa);
  NONFAILING(*(uint32_t*)0x2000023c = 0);
  NONFAILING(*(uint32_t*)0x20000240 = r[4]);
  NONFAILING(*(uint32_t*)0x20000244 = 0);
  inject_fault(0);
  syscall(__NR_write, r[3], 0x20000200, 0x48);
  return 0;
}