// https://syzkaller.appspot.com/bug?id=0a5931f9caef1f88789072a5876c27a09206b5f6
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.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_bpf
#define __NR_bpf 321
#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");
}

#define USLEEP_FORKED_CHILD (3 * 50 * 1000)

static long handle_clone_ret(long ret)
{
  if (ret != 0) {
    __atomic_store_n(&clone_ongoing, 0, __ATOMIC_RELAXED);
    return ret;
  }
  usleep(USLEEP_FORKED_CHILD);
  syscall(__NR_exit, 0);
  while (1) {
  }
}

static long syz_clone(volatile long flags, volatile long stack,
                      volatile long stack_len, volatile long ptid,
                      volatile long ctid, volatile long tls)
{
  long sp = (stack + stack_len) & ~15;
  __atomic_store_n(&clone_ongoing, 1, __ATOMIC_RELAXED);
  long ret = (long)syscall(__NR_clone, flags & ~CLONE_VM, sp, ptid, ctid, tls);
  return handle_clone_ret(ret);
}

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(*(uint32_t*)0x200009c0 = 0xf);
  NONFAILING(*(uint32_t*)0x200009c4 = 4);
  NONFAILING(*(uint32_t*)0x200009c8 = 8);
  NONFAILING(*(uint32_t*)0x200009cc = 8);
  NONFAILING(*(uint32_t*)0x200009d0 = 0);
  NONFAILING(*(uint32_t*)0x200009d4 = -1);
  NONFAILING(*(uint32_t*)0x200009d8 = 0);
  NONFAILING(memset((void*)0x200009dc, 0, 16));
  NONFAILING(*(uint32_t*)0x200009ec = 0);
  NONFAILING(*(uint32_t*)0x200009f0 = -1);
  NONFAILING(*(uint32_t*)0x200009f4 = 0);
  NONFAILING(*(uint32_t*)0x200009f8 = 0);
  NONFAILING(*(uint32_t*)0x200009fc = 0);
  NONFAILING(*(uint64_t*)0x20000a00 = 0);
  res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200009c0ul, /*size=*/0x48ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x200000c0 = 0x11);
  NONFAILING(*(uint32_t*)0x200000c4 = 0xd);
  NONFAILING(*(uint64_t*)0x200000c8 = 0x20000280);
  NONFAILING(memcpy((void*)0x20000280,
                    "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x18\x11\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x20000294 = r[0]);
  NONFAILING(
      memcpy((void*)0x20000298,
             "\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x08\x00\x00\x00\x00\x00\x00"
             "\x7b\x8a\xf8\xff\x00\x00\x00\x00\xbf\xa2\x00\x00\x00\x00\x00\x00"
             "\x07\x02\x00\x00\xf8\xff\xff\xff\xb7\x03\x00\x00\x08\x00\x00\x00"
             "\xb7\x04\x00\x00\x00\x00\x00\x00\x85\x00\x00\x00\x03\x00\x00\x00"
             "\x85\x00\x00\x00\x2a\x00\x00\x00\x95",
             73));
  NONFAILING(*(uint64_t*)0x200000d0 = 0x20000240);
  NONFAILING(memcpy((void*)0x20000240, "GPL\000", 4));
  NONFAILING(*(uint32_t*)0x200000d8 = 0);
  NONFAILING(*(uint32_t*)0x200000dc = 0);
  NONFAILING(*(uint64_t*)0x200000e0 = 0);
  NONFAILING(*(uint32_t*)0x200000e8 = 0);
  NONFAILING(*(uint32_t*)0x200000ec = 0);
  NONFAILING(memset((void*)0x200000f0, 0, 16));
  NONFAILING(*(uint32_t*)0x20000100 = 0);
  NONFAILING(*(uint32_t*)0x20000104 = 0);
  NONFAILING(*(uint32_t*)0x20000108 = -1);
  NONFAILING(*(uint32_t*)0x2000010c = 0);
  NONFAILING(*(uint64_t*)0x20000110 = 0);
  NONFAILING(*(uint32_t*)0x20000118 = 0);
  NONFAILING(*(uint32_t*)0x2000011c = 0);
  NONFAILING(*(uint64_t*)0x20000120 = 0);
  NONFAILING(*(uint32_t*)0x20000128 = 0);
  NONFAILING(*(uint32_t*)0x2000012c = 0);
  NONFAILING(*(uint32_t*)0x20000130 = 0);
  NONFAILING(*(uint32_t*)0x20000134 = 0);
  NONFAILING(*(uint64_t*)0x20000138 = 0);
  NONFAILING(*(uint64_t*)0x20000140 = 0);
  NONFAILING(*(uint32_t*)0x20000148 = 0);
  NONFAILING(*(uint32_t*)0x2000014c = 0);
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint64_t*)0x200001c0 = 0x20000080);
  NONFAILING(memcpy((void*)0x20000080, "kfree\000", 6));
  NONFAILING(*(uint32_t*)0x200001c8 = r[1]);
  syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200001c0ul, /*size=*/0x10ul);
  res = syscall(__NR_socketpair, /*domain=*/1ul, /*type=SOCK_STREAM*/ 1ul,
                /*proto=*/0, /*fds=*/0x20000040ul);
  if (res != -1)
    NONFAILING(r[2] = *(uint32_t*)0x20000044);
  NONFAILING(*(uint32_t*)0x20000200 = 0xf);
  NONFAILING(*(uint32_t*)0x20000204 = 4);
  NONFAILING(*(uint32_t*)0x20000208 = 4);
  NONFAILING(*(uint32_t*)0x2000020c = 0x12);
  NONFAILING(*(uint32_t*)0x20000210 = 0);
  NONFAILING(*(uint32_t*)0x20000214 = -1);
  NONFAILING(*(uint32_t*)0x20000218 = 0);
  NONFAILING(memset((void*)0x2000021c, 0, 16));
  NONFAILING(*(uint32_t*)0x2000022c = 0);
  NONFAILING(*(uint32_t*)0x20000230 = -1);
  NONFAILING(*(uint32_t*)0x20000234 = 0);
  NONFAILING(*(uint32_t*)0x20000238 = 0);
  NONFAILING(*(uint32_t*)0x2000023c = 0);
  NONFAILING(*(uint64_t*)0x20000240 = 0);
  res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x20000200ul, /*size=*/0x48ul);
  if (res != -1)
    r[3] = res;
  NONFAILING(*(uint32_t*)0x20000740 = r[3]);
  NONFAILING(*(uint64_t*)0x20000748 = 0x20000100);
  NONFAILING(*(uint32_t*)0x20000100 = 0);
  NONFAILING(*(uint64_t*)0x20000750 = 0x20000700);
  NONFAILING(*(uint32_t*)0x20000700 = r[2]);
  NONFAILING(*(uint64_t*)0x20000758 = 0);
  syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0x20000740ul, /*size=*/0x20ul);
  NONFAILING(syz_clone(/*flags=*/0, /*stack=*/0, /*stack_len=*/0,
                       /*parentid=*/0, /*childtid=*/0, /*tls=*/0));
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  install_segv_handler();
  loop();
  return 0;
}