// https://syzkaller.appspot.com/bug?id=3c1f47967b7cbd399d3ba3e65f297a29aa1c5f92
// 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 <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include <string.h>

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 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();
  }
}

#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_poll
#define __NR_poll 168
#endif
#ifndef __NR_write
#define __NR_write 4
#endif
#ifndef __NR_readv
#define __NR_readv 145
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[1];
void test()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
  NONFAILING(memcpy((void*)0x20000000, "/dev/sg#", 9));
  r[0] = syz_open_dev(0x20000000, 0, 2);
  NONFAILING(*(uint32_t*)0x20201000 = r[0]);
  NONFAILING(*(uint16_t*)0x20201004 = 0x8000);
  NONFAILING(*(uint16_t*)0x20201006 = 0);
  NONFAILING(*(uint32_t*)0x20201008 = r[0]);
  NONFAILING(*(uint16_t*)0x2020100c = 0x4000);
  NONFAILING(*(uint16_t*)0x2020100e = 0);
  NONFAILING(*(uint32_t*)0x20201010 = r[0]);
  NONFAILING(*(uint16_t*)0x20201014 = 0x2000);
  NONFAILING(*(uint16_t*)0x20201016 = 0);
  NONFAILING(*(uint32_t*)0x20201018 = r[0]);
  NONFAILING(*(uint16_t*)0x2020101c = 4);
  NONFAILING(*(uint16_t*)0x2020101e = 0);
  NONFAILING(*(uint32_t*)0x20201020 = r[0]);
  NONFAILING(*(uint16_t*)0x20201024 = 0x4141);
  NONFAILING(*(uint16_t*)0x20201026 = 0);
  NONFAILING(*(uint32_t*)0x20201028 = r[0]);
  NONFAILING(*(uint16_t*)0x2020102c = 0);
  NONFAILING(*(uint16_t*)0x2020102e = 0);
  syscall(__NR_poll, 0x20201000, 6, 0x1f);
  NONFAILING(*(uint32_t*)0x20001000 = 0);
  NONFAILING(*(uint32_t*)0x20001004 = 6);
  NONFAILING(*(uint16_t*)0x20001008 = 0);
  NONFAILING(*(uint16_t*)0x2000100a = 0);
  NONFAILING(*(uint32_t*)0x2000100c = 0);
  NONFAILING(*(uint32_t*)0x20001010 = 0);
  NONFAILING(*(uint32_t*)0x20001014 = 0);
  NONFAILING(*(uint16_t*)0x20001018 = 0);
  NONFAILING(*(uint16_t*)0x2000101a = 0);
  NONFAILING(*(uint32_t*)0x2000101c = 7);
  NONFAILING(*(uint32_t*)0x20001020 = 0);
  NONFAILING(*(uint32_t*)0x20001024 = 0x2710);
  NONFAILING(*(uint16_t*)0x20001028 = 0);
  NONFAILING(*(uint16_t*)0x2000102a = 0);
  NONFAILING(*(uint32_t*)0x2000102c = 0);
  NONFAILING(*(uint32_t*)0x20001030 = 0);
  NONFAILING(*(uint32_t*)0x20001034 = 0);
  NONFAILING(*(uint16_t*)0x20001038 = 0);
  NONFAILING(*(uint16_t*)0x2000103a = 0);
  NONFAILING(*(uint32_t*)0x2000103c = 0);
  syscall(__NR_write, r[0], 0x20001000, 0x60);
  NONFAILING(*(uint32_t*)0x204e9fd0 = 0x20f0f000);
  NONFAILING(*(uint32_t*)0x204e9fd4 = 1);
  syscall(__NR_readv, r[0], 0x204e9fd0, 1);
}

int main()
{
  install_segv_handler();
  for (;;) {
    loop();
  }
}