// https://syzkaller.appspot.com/bug?id=b5022e0947ec2937508179a7cad5564390d1725b
// 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 <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 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;
}

#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;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  res = syscall(__NR_socketpair, /*domain=AF_UNIX*/ 1ul,
                /*type=SOCK_STREAM*/ 1ul, /*proto=*/0, /*fds=*/0x20000000ul);
  if (res != -1)
    r[0] = *(uint32_t*)0x20000004;
  *(uint32_t*)0x200000c0 = 0x12;
  *(uint32_t*)0x200000c4 = 2;
  *(uint32_t*)0x200000c8 = 4;
  *(uint32_t*)0x200000cc = 2;
  *(uint32_t*)0x200000d0 = 0;
  *(uint32_t*)0x200000d4 = -1;
  *(uint32_t*)0x200000d8 = 0;
  memset((void*)0x200000dc, 0, 16);
  *(uint32_t*)0x200000ec = 0;
  *(uint32_t*)0x200000f0 = -1;
  *(uint32_t*)0x200000f4 = 0;
  *(uint32_t*)0x200000f8 = 0;
  *(uint32_t*)0x200000fc = 0;
  *(uint64_t*)0x20000100 = 0;
  res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200000c0ul, /*size=*/0x48ul);
  if (res != -1)
    r[1] = res;
  *(uint32_t*)0x20000180 = r[1];
  *(uint64_t*)0x20000188 = 0x20000040;
  *(uint32_t*)0x20000040 = 0;
  *(uint64_t*)0x20000190 = 0x20000140;
  *(uint32_t*)0x20000140 = r[0];
  *(uint64_t*)0x20000198 = 0;
  syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0x20000180ul, /*size=*/0x20ul);
  *(uint32_t*)0x200000c0 = 0;
  *(uint32_t*)0x200000c4 = 0xc;
  *(uint64_t*)0x200000c8 = 0x20000440;
  *(uint8_t*)0x20000440 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x20000441, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000441, 0, 4, 4);
  *(uint16_t*)0x20000442 = 0;
  *(uint32_t*)0x20000444 = 0;
  *(uint8_t*)0x20000448 = 0;
  *(uint8_t*)0x20000449 = 0;
  *(uint16_t*)0x2000044a = 0;
  *(uint32_t*)0x2000044c = 0;
  *(uint8_t*)0x20000450 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x20000451, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000451, 1, 4, 4);
  *(uint16_t*)0x20000452 = 0;
  *(uint32_t*)0x20000454 = r[1];
  *(uint8_t*)0x20000458 = 0;
  *(uint8_t*)0x20000459 = 0;
  *(uint16_t*)0x2000045a = 0;
  *(uint32_t*)0x2000045c = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000460, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000460, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000460, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000461, 8, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000461, 0, 4, 4);
  *(uint16_t*)0x20000462 = 0;
  *(uint32_t*)0x20000464 = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000468, 3, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000468, 3, 3, 2);
  STORE_BY_BITMASK(uint8_t, , 0x20000468, 3, 5, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000469, 0xa, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000469, 8, 4, 4);
  *(uint16_t*)0x2000046a = 0xfff8;
  *(uint32_t*)0x2000046c = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000470, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000470, 1, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000470, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000471, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000471, 0xa, 4, 4);
  *(uint16_t*)0x20000472 = 0;
  *(uint32_t*)0x20000474 = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000478, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000478, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000478, 0, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000479, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000479, 0, 4, 4);
  *(uint16_t*)0x2000047a = 0;
  *(uint32_t*)0x2000047c = 0xfffffff8;
  STORE_BY_BITMASK(uint8_t, , 0x20000480, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000480, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000480, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000481, 3, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000481, 0, 4, 4);
  *(uint16_t*)0x20000482 = 0;
  *(uint32_t*)0x20000484 = 8;
  STORE_BY_BITMASK(uint8_t, , 0x20000488, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000488, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000488, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000489, 4, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000489, 0, 4, 4);
  *(uint16_t*)0x2000048a = 0;
  *(uint32_t*)0x2000048c = 0;
  *(uint8_t*)0x20000490 = 0x85;
  *(uint8_t*)0x20000491 = 0;
  *(uint16_t*)0x20000492 = 0;
  *(uint32_t*)0x20000494 = 3;
  *(uint8_t*)0x20000498 = 0x95;
  *(uint8_t*)0x20000499 = 0;
  *(uint16_t*)0x2000049a = 0;
  *(uint32_t*)0x2000049c = 0;
  *(uint64_t*)0x200000d0 = 0;
  *(uint32_t*)0x200000d8 = 0;
  *(uint32_t*)0x200000dc = 0;
  *(uint64_t*)0x200000e0 = 0;
  *(uint32_t*)0x200000e8 = 0;
  *(uint32_t*)0x200000ec = 0;
  memset((void*)0x200000f0, 0, 16);
  *(uint32_t*)0x20000100 = 0;
  *(uint32_t*)0x20000104 = 0;
  *(uint32_t*)0x20000108 = -1;
  *(uint32_t*)0x2000010c = 0;
  *(uint64_t*)0x20000110 = 0;
  *(uint32_t*)0x20000118 = 0;
  *(uint32_t*)0x2000011c = 0;
  *(uint64_t*)0x20000120 = 0;
  *(uint32_t*)0x20000128 = 0;
  *(uint32_t*)0x2000012c = 0;
  *(uint32_t*)0x20000130 = 0;
  *(uint32_t*)0x20000134 = 0;
  *(uint64_t*)0x20000138 = 0;
  *(uint64_t*)0x20000140 = 0;
  *(uint32_t*)0x20000148 = 0;
  *(uint32_t*)0x2000014c = 0;
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul);
  *(uint32_t*)0x200007c0 = 0x11;
  *(uint32_t*)0x200007c4 = 0xc;
  *(uint64_t*)0x200007c8 = 0x20000440;
  *(uint64_t*)0x200007d0 = 0x20000880;
  memcpy((void*)0x20000880, "GPL\000", 4);
  *(uint32_t*)0x200007d8 = 0;
  *(uint32_t*)0x200007dc = 0;
  *(uint64_t*)0x200007e0 = 0;
  *(uint32_t*)0x200007e8 = 0;
  *(uint32_t*)0x200007ec = 0;
  memset((void*)0x200007f0, 0, 16);
  *(uint32_t*)0x20000800 = 0;
  *(uint32_t*)0x20000804 = 0;
  *(uint32_t*)0x20000808 = -1;
  *(uint32_t*)0x2000080c = 0;
  *(uint64_t*)0x20000810 = 0;
  *(uint32_t*)0x20000818 = 0;
  *(uint32_t*)0x2000081c = 0;
  *(uint64_t*)0x20000820 = 0;
  *(uint32_t*)0x20000828 = 0;
  *(uint32_t*)0x2000082c = 0;
  *(uint32_t*)0x20000830 = 0;
  *(uint32_t*)0x20000834 = 0;
  *(uint64_t*)0x20000838 = 0;
  *(uint64_t*)0x20000840 = 0;
  *(uint32_t*)0x20000848 = 0;
  *(uint32_t*)0x2000084c = 0;
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200007c0ul, /*size=*/0x90ul);
  if (res != -1)
    r[2] = res;
  *(uint64_t*)0x200001c0 = 0x20000080;
  memcpy((void*)0x20000080, "kfree\000", 6);
  *(uint32_t*)0x200001c8 = r[2];
  syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200001c0ul, /*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();
  do_sandbox_none();
  return 0;
}