// https://syzkaller.appspot.com/bug?id=c8b5321bfbc2130600f403a5f906d7947a3c78ae
// 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/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/capability.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

static unsigned long long procid;

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;
}

#define MAX_FDS 30

static void setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
  }
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setsid();
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  setup_binderfs();
  loop();
  exit(1);
}

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 close_fds()
{
  for (int fd = 3; fd < MAX_FDS; fd++)
    close(fd);
}

static void setup_sysctl()
{
  char mypid[32];
  snprintf(mypid, sizeof(mypid), "%d", getpid());
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", mypid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data))
      printf("write to %s failed: %s\n", files[i].name, strerror(errno));
  }
}

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();
      close_fds();
      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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  NONFAILING(*(uint32_t*)0x20000180 = 0x18);
  NONFAILING(*(uint32_t*)0x20000184 = 5);
  NONFAILING(*(uint64_t*)0x20000188 = 0x20000480);
  NONFAILING(memcpy(
      (void*)0x20000480,
      "\x18\x01\x00\x00\x21\x00\x00\x00\x00\x00\x00\x00\x3b\x81\x00\x00\x85\x00"
      "\x00\x00\x6d\x00\x00\x00\x85\x00\x00\x00\x50\x00\x00\x00\x95",
      33));
  NONFAILING(*(uint64_t*)0x20000190 = 0x20000040);
  NONFAILING(memcpy((void*)0x20000040, "syzkaller\000", 10));
  NONFAILING(*(uint32_t*)0x20000198 = 0);
  NONFAILING(*(uint32_t*)0x2000019c = 0);
  NONFAILING(*(uint64_t*)0x200001a0 = 0);
  NONFAILING(*(uint32_t*)0x200001a8 = 0);
  NONFAILING(*(uint32_t*)0x200001ac = 0);
  NONFAILING(memset((void*)0x200001b0, 0, 16));
  NONFAILING(*(uint32_t*)0x200001c0 = 0);
  NONFAILING(*(uint32_t*)0x200001c4 = 2);
  NONFAILING(*(uint32_t*)0x200001c8 = -1);
  NONFAILING(*(uint32_t*)0x200001cc = 8);
  NONFAILING(*(uint64_t*)0x200001d0 = 0);
  NONFAILING(*(uint32_t*)0x200001d8 = 0);
  NONFAILING(*(uint32_t*)0x200001dc = 0x10);
  NONFAILING(*(uint64_t*)0x200001e0 = 0);
  NONFAILING(*(uint32_t*)0x200001e8 = 0);
  NONFAILING(*(uint32_t*)0x200001ec = 0);
  NONFAILING(*(uint32_t*)0x200001f0 = 0);
  NONFAILING(*(uint32_t*)0x200001f4 = 0);
  NONFAILING(*(uint64_t*)0x200001f8 = 0);
  NONFAILING(*(uint64_t*)0x20000200 = 0);
  NONFAILING(*(uint32_t*)0x20000208 = 0x10);
  NONFAILING(*(uint32_t*)0x2000020c = 0);
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000180ul, /*size=*/0x80ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint64_t*)0x20000040 = 0x200002c0);
  NONFAILING(memcpy((void*)0x200002c0, "mmap_lock_acquire_returned\000", 27));
  NONFAILING(*(uint32_t*)0x20000048 = r[0]);
  syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000040ul, /*size=*/0x10ul);
  NONFAILING(*(uint32_t*)0x200000c0 = 0x1b);
  NONFAILING(*(uint32_t*)0x200000c4 = 0);
  NONFAILING(*(uint32_t*)0x200000c8 = 0);
  NONFAILING(*(uint32_t*)0x200000cc = 0x8000);
  NONFAILING(*(uint32_t*)0x200000d0 = 0);
  NONFAILING(*(uint32_t*)0x200000d4 = -1);
  NONFAILING(*(uint32_t*)0x200000d8 = 0);
  NONFAILING(memset((void*)0x200000dc, 0, 16));
  NONFAILING(*(uint32_t*)0x200000ec = 0);
  NONFAILING(*(uint32_t*)0x200000f0 = -1);
  NONFAILING(*(uint32_t*)0x200000f4 = 0);
  NONFAILING(*(uint32_t*)0x200000f8 = 0);
  NONFAILING(*(uint32_t*)0x200000fc = 0);
  NONFAILING(*(uint64_t*)0x20000100 = 0);
  res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200000c0ul, /*size=*/0x48ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint32_t*)0x200000c0 = 0);
  NONFAILING(*(uint32_t*)0x200000c4 = 0xc);
  NONFAILING(*(uint64_t*)0x200000c8 = 0x20000240);
  NONFAILING(memcpy((void*)0x20000240,
                    "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x18\x12\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x20000254 = r[1]);
  NONFAILING(memcpy(
      (void*)0x20000258,
      "\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\x00\x00\x00\x00\xb7\x04\x00\x00\x02\x09"
      "\x00\x00\x85\x00\x00\x00\x43\x00\x00\x00\x95",
      65));
  NONFAILING(*(uint64_t*)0x200000d0 = 0);
  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);
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul);
  NONFAILING(*(uint32_t*)0x200000c0 = 0x11);
  NONFAILING(*(uint32_t*)0x200000c4 = 0xc);
  NONFAILING(*(uint64_t*)0x200000c8 = 0x20000240);
  NONFAILING(*(uint64_t*)0x200000d0 = 0x20000200);
  NONFAILING(memcpy((void*)0x20000200, "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[2] = res;
  NONFAILING(*(uint64_t*)0x20000400 = 0x200003c0);
  NONFAILING(memcpy((void*)0x200003c0, "sched_switch\000", 13));
  NONFAILING(*(uint32_t*)0x20000408 = r[2]);
  syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000400ul, /*size=*/0x10ul);
}
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);
  setup_sysctl();
  install_segv_handler();
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}