// https://syzkaller.appspot.com/bug?id=19dfac511f79715d862d3b7c9c783913189892ab
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <setjmp.h>
#include <signal.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 void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0};

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);
  install_segv_handler();
  use_temporary_dir();
  intptr_t res = 0;
  NONFAILING(memcpy((void*)0x20000000, "/proc/self/exe\000", 15));
  res = syscall(__NR_openat, 0xffffff9c, 0x20000000ul, 0ul, 0ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(memcpy((void*)0x20000300, "./bus\000", 6));
  res = syscall(__NR_creat, 0x20000300ul, 0ul);
  if (res != -1)
    r[1] = res;
  res = syscall(__NR_io_setup, 2, 0x20000140ul);
  if (res != -1)
    NONFAILING(r[2] = *(uint64_t*)0x20000140);
  NONFAILING(*(uint64_t*)0x20000540 = 0x200000c0);
  NONFAILING(*(uint64_t*)0x200000c0 = 0);
  NONFAILING(*(uint32_t*)0x200000c8 = 0);
  NONFAILING(*(uint32_t*)0x200000cc = 0);
  NONFAILING(*(uint16_t*)0x200000d0 = 1);
  NONFAILING(*(uint16_t*)0x200000d2 = 0);
  NONFAILING(*(uint32_t*)0x200000d4 = r[1]);
  NONFAILING(*(uint64_t*)0x200000d8 = 0x20000000);
  NONFAILING(*(uint64_t*)0x200000e0 = 0x200a00);
  NONFAILING(*(uint64_t*)0x200000e8 = 0);
  NONFAILING(*(uint64_t*)0x200000f0 = 0);
  NONFAILING(*(uint32_t*)0x200000f8 = 0);
  NONFAILING(*(uint32_t*)0x200000fc = -1);
  syscall(__NR_io_submit, r[2], 8ul, 0x20000540ul);
  syscall(__NR_mmap, 0x20000000ul, 0x800000ul, 0x100000aul, 0x12ul, r[0], 0ul);
  return 0;
}