// https://syzkaller.appspot.com/bug?id=a90ca45133088ce07550f7cee0be028ee079c3f4
// 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>

#ifndef __NR_dup
#define __NR_dup 23
#endif
#ifndef __NR_getresuid
#define __NR_getresuid 148
#endif
#ifndef __NR_mkdirat
#define __NR_mkdirat 34
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_mount
#define __NR_mount 40
#endif
#ifndef __NR_pipe2
#define __NR_pipe2 59
#endif
#ifndef __NR_setxattr
#define __NR_setxattr 5
#endif
#ifndef __NR_write
#define __NR_write 64
#endif

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  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 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;
}

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);
  for (int 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 = 0;
  for (;; 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 < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  NONFAILING(memcpy((void*)0x20000000, "./file0\000", 8));
  syscall(__NR_mkdirat, 0xffffff9c, 0x20000000ul, 0ul);
  res = syscall(__NR_pipe2, 0x20000240ul, 0ul);
  if (res != -1) {
    NONFAILING(r[0] = *(uint32_t*)0x20000240);
    NONFAILING(r[1] = *(uint32_t*)0x20000244);
  }
  NONFAILING(memcpy((void*)0x20000140,
                    "\x15\x00\x00\x00\x65\xff\xff\x09\x7b\x00\x00\x08\x00\x39"
                    "\x50\x32\x30\x30\x30\x2e\x4c",
                    21));
  syscall(__NR_write, r[1], 0x20000140ul, 0x15ul);
  res = syscall(__NR_dup, r[1]);
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint32_t*)0x20000100 = 0x18);
  NONFAILING(*(uint32_t*)0x20000104 = 0);
  NONFAILING(*(uint64_t*)0x20000108 = 0);
  NONFAILING(*(uint64_t*)0x20000110 = 0);
  syscall(__NR_write, r[2], 0x20000100ul, 0x18ul);
  NONFAILING(memset((void*)0x20000540, 168, 1));
  syscall(__NR_write, r[2], 0x20000540ul, 0xa8ul);
  NONFAILING(memset((void*)0x20002bc0, 240, 1));
  syscall(__NR_write, r[2], 0x20002bc0ul, 0x160ul);
  res = syscall(__NR_getresuid, 0x20000440ul, 0x20000480ul, 0x200004c0ul);
  if (res != -1)
    NONFAILING(r[3] = *(uint32_t*)0x200004c0);
  NONFAILING(memcpy((void*)0x20000040, "./file0\000", 8));
  NONFAILING(memcpy((void*)0x20000b80, "9p\000", 3));
  NONFAILING(memcpy((void*)0x20000580, "trans=fd,rfdno=", 15));
  NONFAILING(sprintf((char*)0x2000058f, "0x%016llx", (long long)r[0]));
  NONFAILING(memcpy((void*)0x200005a1, ",wfdno=", 7));
  NONFAILING(sprintf((char*)0x200005a8, "0x%016llx", (long long)r[2]));
  NONFAILING(memcpy((void*)0x200005ba, ",privport,access=", 17));
  NONFAILING(sprintf((char*)0x200005cb, "%020llu", (long long)r[3]));
  syscall(__NR_mount, 0ul, 0x20000040ul, 0x20000b80ul, 0ul, 0x20000580ul);
  NONFAILING(memcpy((void*)0x20000040, "./file0\000", 8));
  NONFAILING(memcpy((void*)0x20000100, "trusted.overlay.upper\000", 22));
  syscall(__NR_setxattr, 0x20000040ul, 0x20000100ul, 0ul, 0ul, 0ul);
}
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();
  loop();
  return 0;
}