// https://syzkaller.appspot.com/bug?id=c5fe17a9710b37c446e73ecf88adae7ae930105a
// 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 unsigned long long procid;

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 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[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  syscall(__NR_perf_event_open, /*attr=*/0ul, /*pid=*/0, /*cpu=*/-1,
          /*group=*/-1, /*flags=*/0ul);
  *(uint32_t*)0x200009c0 = 0xf;
  *(uint32_t*)0x200009c4 = 4;
  *(uint32_t*)0x200009c8 = 8;
  *(uint32_t*)0x200009cc = 8;
  *(uint32_t*)0x200009d0 = 0;
  *(uint32_t*)0x200009d4 = -1;
  *(uint32_t*)0x200009d8 = 0;
  memset((void*)0x200009dc, 0, 16);
  *(uint32_t*)0x200009ec = 0;
  *(uint32_t*)0x200009f0 = -1;
  *(uint32_t*)0x200009f4 = 0;
  *(uint32_t*)0x200009f8 = 0;
  *(uint32_t*)0x200009fc = 0;
  *(uint64_t*)0x20000a00 = 0;
  res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200009c0ul, /*size=*/0x48ul);
  if (res != -1)
    r[0] = res;
  *(uint32_t*)0x200000c0 = 0x11;
  *(uint32_t*)0x200000c4 = 0x14;
  *(uint64_t*)0x200000c8 = 0x20000c80;
  *(uint8_t*)0x20000c80 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x20000c81, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000c81, 0, 4, 4);
  *(uint16_t*)0x20000c82 = 0;
  *(uint32_t*)0x20000c84 = 0;
  *(uint8_t*)0x20000c88 = 0;
  *(uint8_t*)0x20000c89 = 0;
  *(uint16_t*)0x20000c8a = 0;
  *(uint32_t*)0x20000c8c = 0;
  *(uint8_t*)0x20000c90 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x20000c91, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000c91, 1, 4, 4);
  *(uint16_t*)0x20000c92 = 0;
  *(uint32_t*)0x20000c94 = r[0];
  *(uint8_t*)0x20000c98 = 0;
  *(uint8_t*)0x20000c99 = 0;
  *(uint16_t*)0x20000c9a = 0;
  *(uint32_t*)0x20000c9c = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000ca0, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000ca0, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000ca0, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000ca1, 8, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000ca1, 0, 4, 4);
  *(uint16_t*)0x20000ca2 = 0;
  *(uint32_t*)0x20000ca4 = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000ca8, 3, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000ca8, 3, 3, 2);
  STORE_BY_BITMASK(uint8_t, , 0x20000ca8, 3, 5, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000ca9, 0xa, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000ca9, 8, 4, 4);
  *(uint16_t*)0x20000caa = 0xfff8;
  *(uint32_t*)0x20000cac = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000cb0, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000cb0, 1, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000cb0, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cb1, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cb1, 0xa, 4, 4);
  *(uint16_t*)0x20000cb2 = 0;
  *(uint32_t*)0x20000cb4 = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000cb8, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000cb8, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000cb8, 0, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cb9, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cb9, 0, 4, 4);
  *(uint16_t*)0x20000cba = 0;
  *(uint32_t*)0x20000cbc = 0xfffffff8;
  STORE_BY_BITMASK(uint8_t, , 0x20000cc0, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000cc0, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000cc0, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cc1, 3, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cc1, 0, 4, 4);
  *(uint16_t*)0x20000cc2 = 0;
  *(uint32_t*)0x20000cc4 = 8;
  STORE_BY_BITMASK(uint8_t, , 0x20000cc8, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000cc8, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000cc8, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cc9, 4, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cc9, 0, 4, 4);
  *(uint16_t*)0x20000cca = 0;
  *(uint32_t*)0x20000ccc = 0;
  *(uint8_t*)0x20000cd0 = 0x85;
  *(uint8_t*)0x20000cd1 = 0;
  *(uint16_t*)0x20000cd2 = 0;
  *(uint32_t*)0x20000cd4 = 3;
  *(uint8_t*)0x20000cd8 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x20000cd9, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cd9, 0, 4, 4);
  *(uint16_t*)0x20000cda = 0;
  *(uint32_t*)0x20000cdc = 0x25702020;
  *(uint8_t*)0x20000ce0 = 0;
  *(uint8_t*)0x20000ce1 = 0;
  *(uint16_t*)0x20000ce2 = 0;
  *(uint32_t*)0x20000ce4 = 0x20202000;
  STORE_BY_BITMASK(uint8_t, , 0x20000ce8, 3, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000ce8, 3, 3, 2);
  STORE_BY_BITMASK(uint8_t, , 0x20000ce8, 3, 5, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000ce9, 0xa, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000ce9, 1, 4, 4);
  *(uint16_t*)0x20000cea = 0xfff8;
  *(uint32_t*)0x20000cec = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000cf0, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000cf0, 1, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000cf0, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cf1, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cf1, 0xa, 4, 4);
  *(uint16_t*)0x20000cf2 = 0;
  *(uint32_t*)0x20000cf4 = 0;
  STORE_BY_BITMASK(uint8_t, , 0x20000cf8, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000cf8, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000cf8, 0, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cf9, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000cf9, 0, 4, 4);
  *(uint16_t*)0x20000cfa = 0;
  *(uint32_t*)0x20000cfc = 0xfffffff8;
  STORE_BY_BITMASK(uint8_t, , 0x20000d00, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000d00, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000d00, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000d01, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000d01, 0, 4, 4);
  *(uint16_t*)0x20000d02 = 0;
  *(uint32_t*)0x20000d04 = 8;
  STORE_BY_BITMASK(uint8_t, , 0x20000d08, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000d08, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000d08, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000d09, 3, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000d09, 0, 4, 4);
  *(uint16_t*)0x20000d0a = 0;
  *(uint32_t*)0x20000d0c = 0;
  *(uint8_t*)0x20000d10 = 0x85;
  *(uint8_t*)0x20000d11 = 0;
  *(uint16_t*)0x20000d12 = 0;
  *(uint32_t*)0x20000d14 = 6;
  *(uint8_t*)0x20000d18 = 0x95;
  *(uint8_t*)0x20000d19 = 0;
  *(uint16_t*)0x20000d1a = 0;
  *(uint32_t*)0x20000d1c = 0;
  *(uint64_t*)0x200000d0 = 0x20000240;
  memcpy((void*)0x20000240, "GPL\000", 4);
  *(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;
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x200005c0 = 0x20000900;
  memcpy((void*)0x20000900, "mm_page_alloc\000", 14);
  *(uint32_t*)0x200005c8 = r[1];
  syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200005c0ul, /*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);
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}