// https://syzkaller.appspot.com/bug?id=8b456d9f4b011cb98abfcc9264b55420ad6f9ab0
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <string.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++) {
  }
}

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 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);
  }
}

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

long r[15];
void loop()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  NONFAILING(memcpy((void*)0x20ee1000,
                    "\x2f\x64\x65\x76\x2f\x6c\x6f\x6f\x70\x23\x00",
                    11));
  r[2] = syz_open_dev(0x20ee1000ul, 0x0ul, 0x2ul);
  NONFAILING(memcpy((void*)0x20000000, "\xff\xf8", 2));
  r[4] = syscall(__NR_memfd_create, 0x20000000ul, 0x2ul);
  NONFAILING(*(uint64_t*)0x20b4efe0 = (uint64_t)0x2064d000);
  NONFAILING(*(uint64_t*)0x20b4efe8 = (uint64_t)0x0);
  NONFAILING(*(uint64_t*)0x20b4eff0 = (uint64_t)0x20e04f4f);
  NONFAILING(*(uint64_t*)0x20b4eff8 = (uint64_t)0xb1);
  NONFAILING(memcpy(
      (void*)0x20e04f4f,
      "\x69\x7d\x06\x0c\xf9\xd8\xbc\x6d\xf3\xc8\x51\x00\x11\x43\x8b\xa2"
      "\x4e\xa2\xb2\x26\x10\xaa\xb4\xd2\xb6\xdc\xe4\xf2\xaa\x43\xff\xa8"
      "\xa9\xfa\x8a\x9e\x94\x2b\x2d\x65\x90\xea\xf4\x9c\xf0\xe3\xfd\x23"
      "\x85\x81\x42\xe0\x29\x53\xdf\xc6\x5f\xde\x3b\xb8\x56\x5c\xcf\x35"
      "\xc5\x5f\xc2\x48\xd0\xad\x6c\x47\x3f\x76\x63\x55\xd2\x2a\x9d\x2f"
      "\x43\xf4\x49\x3c\xd5\x07\xf9\x19\xab\x87\x3a\xa3\xc9\xfb\x28\x8f"
      "\x4a\xe3\xa1\x34\xda\x84\x40\xae\xee\x57\xd6\x4a\x2a\x47\x14\x2d"
      "\x56\x92\x64\xdd\x9e\xc1\xfa\x49\x25\x33\xe8\x14\x53\xf1\xad\x1d"
      "\xae\x61\xd9\xbe\x13\xe0\x70\xac\x9d\x36\xf4\x33\xc0\xf1\x2a\xe8"
      "\xd5\x6a\xf7\xfb\x38\x01\xa8\x29\xa6\x26\xa8\x7b\x14\x23\x5f\x44"
      "\xc2\x86\x51\xbf\x99\xa7\x80\x82\x94\x96\x57\xf7\x4b\x04\x8a\xe1"
      "\xca",
      177));
  r[10] = syscall(__NR_pwritev, r[4], 0x20b4efe0ul, 0x2ul, 0x80fcul);
  r[11] = syscall(__NR_ioctl, r[2], 0x4c00ul, r[4]);
  NONFAILING(memcpy((void*)0x20000000,
                    "\x2f\x64\x65\x76\x2f\x6c\x6f\x6f\x70\x23\x00",
                    11));
  r[13] = syz_open_dev(0x20000000ul, 0x0ul, 0x2ul);
  r[14] = syscall(__NR_fallocate, r[13], 0x11ul, 0x800ul, 0x44400005ul);
}

int main()
{
  install_segv_handler();
  loop();
  return 0;
}