// https://syzkaller.appspot.com/bug?id=02a32f98a4e3b5a2ed6929aabdd28dd1618b9c03
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#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/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.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 void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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 void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  NONFAILING(*(uint32_t*)0x20caefb8 = 0x16);
  NONFAILING(*(uint32_t*)0x20caefbc = 3);
  NONFAILING(*(uint64_t*)0x20caefc0 = 0x2045c000);
  NONFAILING(*(uint8_t*)0x2045c000 = 0x85);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x2045c001, 0, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x2045c001, 0, 4, 4));
  NONFAILING(*(uint16_t*)0x2045c002 = 0);
  NONFAILING(*(uint32_t*)0x2045c004 = 7);
  NONFAILING(*(uint8_t*)0x2045c008 = 0x4c);
  NONFAILING(*(uint8_t*)0x2045c009 = 0);
  NONFAILING(*(uint16_t*)0x2045c00a = 0);
  NONFAILING(*(uint32_t*)0x2045c00c = 0);
  NONFAILING(*(uint8_t*)0x2045c010 = 0x95);
  NONFAILING(*(uint8_t*)0x2045c011 = 0);
  NONFAILING(*(uint16_t*)0x2045c012 = 0);
  NONFAILING(*(uint32_t*)0x2045c014 = 0);
  NONFAILING(*(uint64_t*)0x20caefc8 = 0x20281ffc);
  NONFAILING(memcpy((void*)0x20281ffc, "G\377L\000", 4));
  NONFAILING(*(uint32_t*)0x20caefd0 = 0);
  NONFAILING(*(uint32_t*)0x20caefd4 = 0);
  NONFAILING(*(uint64_t*)0x20caefd8 = 0);
  NONFAILING(*(uint32_t*)0x20caefe0 = 0);
  NONFAILING(*(uint32_t*)0x20caefe4 = 0);
  NONFAILING(*(uint8_t*)0x20caefe8 = 0);
  NONFAILING(*(uint8_t*)0x20caefe9 = 0);
  NONFAILING(*(uint8_t*)0x20caefea = 0);
  NONFAILING(*(uint8_t*)0x20caefeb = 0);
  NONFAILING(*(uint8_t*)0x20caefec = 0);
  NONFAILING(*(uint8_t*)0x20caefed = 0);
  NONFAILING(*(uint8_t*)0x20caefee = 0);
  NONFAILING(*(uint8_t*)0x20caefef = 0);
  NONFAILING(*(uint8_t*)0x20caeff0 = 0);
  NONFAILING(*(uint8_t*)0x20caeff1 = 0);
  NONFAILING(*(uint8_t*)0x20caeff2 = 0);
  NONFAILING(*(uint8_t*)0x20caeff3 = 0);
  NONFAILING(*(uint8_t*)0x20caeff4 = 0);
  NONFAILING(*(uint8_t*)0x20caeff5 = 0);
  NONFAILING(*(uint8_t*)0x20caeff6 = 0);
  NONFAILING(*(uint8_t*)0x20caeff7 = 0);
  NONFAILING(*(uint32_t*)0x20caeff8 = 0);
  NONFAILING(*(uint32_t*)0x20caeffc = 0);
  NONFAILING(*(uint32_t*)0x20caf000 = -1);
  NONFAILING(*(uint32_t*)0x20caf004 = 8);
  NONFAILING(*(uint64_t*)0x20caf008 = 0x20000000);
  NONFAILING(*(uint32_t*)0x20000000 = 0);
  NONFAILING(*(uint32_t*)0x20000004 = 0);
  NONFAILING(*(uint32_t*)0x20caf010 = 0);
  NONFAILING(*(uint32_t*)0x20caf014 = 0x10);
  NONFAILING(*(uint64_t*)0x20caf018 = 0x20000000);
  NONFAILING(*(uint32_t*)0x20000000 = 0);
  NONFAILING(*(uint32_t*)0x20000004 = 0);
  NONFAILING(*(uint32_t*)0x20000008 = 0);
  NONFAILING(*(uint32_t*)0x2000000c = 0);
  NONFAILING(*(uint32_t*)0x20caf020 = 0);
  res = syscall(__NR_bpf, 5, 0x20caefb8, 0x48);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x200001c0 = r[0]);
  NONFAILING(*(uint32_t*)0x200001c4 = 5);
  NONFAILING(*(uint32_t*)0x200001c8 = 0xe);
  NONFAILING(*(uint32_t*)0x200001cc = 0);
  NONFAILING(*(uint64_t*)0x200001d0 = 0x20000080);
  NONFAILING(memcpy((void*)0x20000080,
                    "\xad\x46\xeb\xbb\xff\x37\xf7\x24\xed\x8c\x00\xf5\x79\xbf",
                    14));
  NONFAILING(*(uint64_t*)0x200001d8 = 0);
  NONFAILING(*(uint32_t*)0x200001e0 = 0x8000);
  NONFAILING(*(uint32_t*)0x200001e4 = 0);
  syscall(__NR_bpf, 0xa, 0x200001c0, 0x28);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  loop();
  return 0;
}