// https://syzkaller.appspot.com/bug?id=6dcd14a729df98f989c7b76d254226ae67084efd
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <stdint.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

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;
    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 loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);

#define CLONE_NEWCGROUP 0x02000000

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(CLONE_NEWCGROUP)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

static int do_sandbox_none(int executor_pid, bool enable_tun)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }

  loop();
  doexit(1);
}

static void test();

void loop()
{
  while (1) {
    test();
  }
}

long r[1];
uint64_t procid;
void test()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
  memcpy((void*)0x20d72ff7, "/dev/sg#", 9);
  r[0] = syz_open_dev(0x20d72ff7, 0, 0x2000000002);
  *(uint8_t*)0x20428f7a = 0;
  *(uint8_t*)0x20428f7b = 0;
  *(uint16_t*)0x20428f7c = 0;
  *(uint16_t*)0x20428f7e = 0;
  *(uint16_t*)0x20428f80 = 0;
  *(uint16_t*)0x20428f82 = 0;
  STORE_BY_BITMASK(uint8_t, 0x20428f84, 7, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x20428f84, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x20428f85, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x20428f85, 0, 2, 6);
  *(uint16_t*)0x20428f86 = htobe16(0x30);
  *(uint16_t*)0x20428f88 = 0;
  *(uint16_t*)0x20428f8a = htobe16(0);
  *(uint8_t*)0x20428f8c = 0;
  *(uint8_t*)0x20428f8d = 0;
  *(uint16_t*)0x20428f8e = 0;
  *(uint32_t*)0x20428f90 = htobe32(0xe0000002);
  *(uint32_t*)0x20428f94 = htobe32(0xe0000001);
  *(uint8_t*)0x20428f98 = 7;
  *(uint8_t*)0x20428f99 = 7;
  *(uint8_t*)0x20428f9a = 0;
  *(uint32_t*)0x20428f9b = htobe32(-1);
  *(uint16_t*)0x20428fa0 = 0;
  *(uint16_t*)0x20428fa2 = 0;
  *(uint32_t*)0x20428fa4 = 0x42424242;
  *(uint32_t*)0x20428fa8 = 0x42424242;
  STORE_BY_BITMASK(uint8_t, 0x20428fac, 0, 0, 1);
  STORE_BY_BITMASK(uint8_t, 0x20428fac, 0, 1, 3);
  STORE_BY_BITMASK(uint8_t, 0x20428fac, 5, 4, 4);
  *(uint8_t*)0x20428fad = 0;
  *(uint16_t*)0x20428fae = htobe16(0);
  *(uint16_t*)0x20428fb0 = 0;
  *(uint16_t*)0x20428fb2 = htobe16(0);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x20428f90, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x20428f94, 4);
  uint16_t csum_1_chunk_2 = 0x600;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
  uint16_t csum_1_chunk_3 = 0x1400;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
  csum_inet_update(&csum_1, (const uint8_t*)0x20428fa0, 20);
  *(uint16_t*)0x20428fb0 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x20428f84, 28);
  *(uint16_t*)0x20428f8e = csum_inet_digest(&csum_2);
  syscall(__NR_write, r[0], 0x20428f7a, 0x3a);
  *(uint64_t*)0x203f8f70 = 0x20adff12;
  *(uint64_t*)0x203f8f78 = 0xee;
  syscall(__NR_readv, r[0], 0x203f8f70, 1);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        int pid = do_sandbox_none(procid, false);
        int status = 0;
        while (waitpid(pid, &status, __WALL) != pid) {
        }
      }
    }
  }
  sleep(1000000);
  return 0;
}