// https://syzkaller.appspot.com/bug?id=3a0130f6b0d9eadf2a211d84fdc2f69c9741afc2
// 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_clone
#define __NR_clone 220
#endif
#ifndef __NR_exit
#define __NR_exit 93
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_mprotect
#define __NR_mprotect 226
#endif
#ifndef __NR_ptrace
#define __NR_ptrace 117
#endif
#ifndef __NR_sendmsg
#define __NR_sendmsg 211
#endif
#ifndef __NR_setsockopt
#define __NR_setsockopt 208
#endif
#ifndef __NR_wait4
#define __NR_wait4 260
#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 (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[1] = {0x0};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  setsockopt$inet6_tcp_TCP_REPAIR_WINDOW arguments: [
  //    fd: sock_tcp6 (resource)
  //    level: const = 0x6 (4 bytes)
  //    optname: const = 0x1d (4 bytes)
  //    optval: ptr[in, tcp_repair_window] {
  //      tcp_repair_window {
  //        snd_wl1: int32 = 0xffff8006 (4 bytes)
  //        snd_wnd: int32 = 0x9 (4 bytes)
  //        max_window: int32 = 0x800 (4 bytes)
  //        rcv_wnd: int32 = 0x5 (4 bytes)
  //        rcv_wup: int32 = 0x4 (4 bytes)
  //      }
  //    }
  //    optlen: len = 0x14 (8 bytes)
  //  ]
  NONFAILING(*(uint32_t*)0x20000040 = 0xffff8006);
  NONFAILING(*(uint32_t*)0x20000044 = 9);
  NONFAILING(*(uint32_t*)0x20000048 = 0x800);
  NONFAILING(*(uint32_t*)0x2000004c = 5);
  NONFAILING(*(uint32_t*)0x20000050 = 4);
  syscall(__NR_setsockopt, /*fd=*/(intptr_t)-1, /*level=*/6, /*optname=*/0x1d,
          /*optval=*/0x20000040ul, /*optlen=*/0x14ul);
  //  sendmsg$inet_sctp arguments: [
  //    fd: sock_sctp (resource)
  //    msg: ptr[in, msghdr_sctp] {
  //      msghdr_sctp {
  //        addr: ptr[in, sockaddr_sctp] {
  //          union sockaddr_sctp {
  //            in: sockaddr_in {
  //              family: const = 0x2 (2 bytes)
  //              port: int16be = 0x4e24 (2 bytes)
  //              addr: union ipv4_addr {
  //                dev: ipv4_addr_t[netdev_addr_id] {
  //                  a0: const = 0xac (1 bytes)
  //                  a1: const = 0x14 (1 bytes)
  //                  a2: const = 0x14 (1 bytes)
  //                  a3: int8 = 0x2c (1 bytes)
  //                }
  //              }
  //              pad = 0x0 (8 bytes)
  //            }
  //          }
  //        }
  //        addrlen: len = 0x10 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //        vec: nil
  //        vlen: len = 0x0 (8 bytes)
  //        ctrl: nil
  //        ctrllen: bytesize = 0x0 (8 bytes)
  //        f: send_flags = 0x40084 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //      }
  //    }
  //    f: send_flags = 0x1 (8 bytes)
  //  ]
  NONFAILING(*(uint64_t*)0x20000000 = 0x20000040);
  NONFAILING(*(uint16_t*)0x20000040 = 2);
  NONFAILING(*(uint16_t*)0x20000042 = htobe16(0x4e24));
  NONFAILING(*(uint8_t*)0x20000044 = 0xac);
  NONFAILING(*(uint8_t*)0x20000045 = 0x14);
  NONFAILING(*(uint8_t*)0x20000046 = 0x14);
  NONFAILING(*(uint8_t*)0x20000047 = 0x2c);
  NONFAILING(*(uint32_t*)0x20000008 = 0x10);
  NONFAILING(*(uint64_t*)0x20000010 = 0);
  NONFAILING(*(uint64_t*)0x20000018 = 0);
  NONFAILING(*(uint64_t*)0x20000020 = 0);
  NONFAILING(*(uint64_t*)0x20000028 = 0);
  NONFAILING(*(uint32_t*)0x20000030 = 0x40084);
  syscall(__NR_sendmsg, /*fd=*/(intptr_t)-1, /*msg=*/0x20000000ul,
          /*f=MSG_OOB*/ 1ul);
  //  mprotect arguments: [
  //    addr: VMA[0xf000]
  //    len: len = 0xf000 (8 bytes)
  //    prot: mmap_prot = 0x1 (8 bytes)
  //  ]
  syscall(__NR_mprotect, /*addr=*/0x20000000ul, /*len=*/0xf000ul,
          /*prot=PROT_READ*/ 1ul);
  //  syz_clone arguments: [
  //    flags: clone_flags = 0x11 (8 bytes)
  //    stack: nil
  //    stack_len: bytesize = 0x0 (8 bytes)
  //    parentid: nil
  //    childtid: nil
  //    tls: nil
  //  ]
  //  returns pid
  res = -1;
  NONFAILING(res = syz_clone(/*flags=*/0x11, /*stack=*/0, /*stack_len=*/0,
                             /*parentid=*/0, /*childtid=*/0, /*tls=*/0));
  if (res != -1)
    r[0] = res;
  //  ptrace arguments: [
  //    req: ptrace_req = 0x10 (8 bytes)
  //    pid: pid (resource)
  //  ]
  syscall(__NR_ptrace, /*req=PTRACE_ATTACH*/ 0x10ul, /*pid=*/r[0], 0, 0);
  //  wait4 arguments: [
  //    pid: pid (resource)
  //    status: nil
  //    options: wait_options = 0x40000000 (8 bytes)
  //    ru: nil
  //  ]
  syscall(__NR_wait4, /*pid=*/r[0], /*status=*/0ul,
          /*options=__WALL*/ 0x40000000ul, /*ru=*/0ul);
  //  ptrace$setregset arguments: [
  //    req: const = 0x4205 (8 bytes)
  //    pid: pid (resource)
  //    what: pthread_regset = 0x405 (8 bytes)
  //    data: ptr[in, iovec[in, array[int8]]] {
  //      iovec[in, array[int8]] {
  //        addr: nil
  //        len: len = 0x300 (8 bytes)
  //      }
  //    }
  //  ]
  NONFAILING(*(uint64_t*)0x20000000 = 0);
  NONFAILING(*(uint64_t*)0x20000008 = 0x300);
  syscall(__NR_ptrace, /*req=*/0x4205ul, /*pid=*/r[0],
          /*what=NT_TASKSTRUCT|NT_PRSTATUS|0x400*/ 0x405ul,
          /*data=*/0x20000000ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-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=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  loop();
  return 0;
}