// https://syzkaller.appspot.com/bug?id=dece2e3d56a21d0057ba51c67cb76421f6b7130d
// 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 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;
  *(uint32_t*)0x200009c0 = 0x12;
  *(uint32_t*)0x200009c4 = 5;
  *(uint32_t*)0x200009c8 = 8;
  *(uint32_t*)0x200009cc = 1;
  *(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;
  res = syscall(__NR_socket, /*domain=*/2ul, /*type=*/2ul, /*proto=*/0);
  if (res != -1)
    r[1] = res;
  *(uint32_t*)0x20000940 = r[0];
  *(uint64_t*)0x20000948 = 0x20000780;
  *(uint64_t*)0x20000950 = 0x20000900;
  *(uint32_t*)0x20000900 = r[1];
  *(uint64_t*)0x20000958 = 0;
  syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0x20000940ul, /*size=*/0x20ul);
  *(uint32_t*)0x20000000 = 0x11;
  *(uint32_t*)0x20000004 = 0xc;
  *(uint64_t*)0x20000008 = 0x200001c0;
  *(uint8_t*)0x200001c0 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x200001c1, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001c1, 0, 4, 4);
  *(uint16_t*)0x200001c2 = 0;
  *(uint32_t*)0x200001c4 = 0;
  *(uint8_t*)0x200001c8 = 0;
  *(uint8_t*)0x200001c9 = 0;
  *(uint16_t*)0x200001ca = 0;
  *(uint32_t*)0x200001cc = 0;
  *(uint8_t*)0x200001d0 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x200001d1, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001d1, 1, 4, 4);
  *(uint16_t*)0x200001d2 = 0;
  *(uint32_t*)0x200001d4 = r[0];
  *(uint8_t*)0x200001d8 = 0;
  *(uint8_t*)0x200001d9 = 0;
  *(uint16_t*)0x200001da = 0;
  *(uint32_t*)0x200001dc = 0;
  STORE_BY_BITMASK(uint8_t, , 0x200001e0, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001e0, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x200001e0, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001e1, 8, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001e1, 0, 4, 4);
  *(uint16_t*)0x200001e2 = 0;
  *(uint32_t*)0x200001e4 = 0;
  STORE_BY_BITMASK(uint8_t, , 0x200001e8, 3, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001e8, 3, 3, 2);
  STORE_BY_BITMASK(uint8_t, , 0x200001e8, 3, 5, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001e9, 0xa, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001e9, 8, 4, 4);
  *(uint16_t*)0x200001ea = 0xfff8;
  *(uint32_t*)0x200001ec = 0;
  STORE_BY_BITMASK(uint8_t, , 0x200001f0, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001f0, 1, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x200001f0, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001f1, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001f1, 0xa, 4, 4);
  *(uint16_t*)0x200001f2 = 0;
  *(uint32_t*)0x200001f4 = 0;
  STORE_BY_BITMASK(uint8_t, , 0x200001f8, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001f8, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x200001f8, 0, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001f9, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001f9, 0, 4, 4);
  *(uint16_t*)0x200001fa = 0;
  *(uint32_t*)0x200001fc = 0xfffffff8;
  STORE_BY_BITMASK(uint8_t, , 0x20000200, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000200, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000200, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000201, 3, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000201, 0, 4, 4);
  *(uint16_t*)0x20000202 = 0;
  *(uint32_t*)0x20000204 = 8;
  STORE_BY_BITMASK(uint8_t, , 0x20000208, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x20000208, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x20000208, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000209, 4, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000209, 0, 4, 4);
  *(uint16_t*)0x2000020a = 0;
  *(uint32_t*)0x2000020c = 0;
  *(uint8_t*)0x20000210 = 0x85;
  *(uint8_t*)0x20000211 = 0;
  *(uint16_t*)0x20000212 = 0;
  *(uint32_t*)0x20000214 = 3;
  *(uint8_t*)0x20000218 = 0x95;
  *(uint8_t*)0x20000219 = 0;
  *(uint16_t*)0x2000021a = 0;
  *(uint32_t*)0x2000021c = 0;
  *(uint64_t*)0x20000010 = 0x20000240;
  memcpy((void*)0x20000240, "GPL\000", 4);
  *(uint32_t*)0x20000018 = 0;
  *(uint32_t*)0x2000001c = 0;
  *(uint64_t*)0x20000020 = 0;
  *(uint32_t*)0x20000028 = 0;
  *(uint32_t*)0x2000002c = 0;
  memset((void*)0x20000030, 0, 16);
  *(uint32_t*)0x20000040 = 0;
  *(uint32_t*)0x20000044 = 0;
  *(uint32_t*)0x20000048 = -1;
  *(uint32_t*)0x2000004c = 0;
  *(uint64_t*)0x20000050 = 0;
  *(uint32_t*)0x20000058 = 0;
  *(uint32_t*)0x2000005c = 0;
  *(uint64_t*)0x20000060 = 0;
  *(uint32_t*)0x20000068 = 0;
  *(uint32_t*)0x2000006c = 0;
  *(uint32_t*)0x20000070 = 0;
  *(uint32_t*)0x20000074 = 0;
  *(uint64_t*)0x20000078 = 0;
  *(uint64_t*)0x20000080 = 0;
  *(uint32_t*)0x20000088 = 0;
  *(uint32_t*)0x2000008c = 0;
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000000ul, /*size=*/0x90ul);
  if (res != -1)
    r[2] = res;
  *(uint64_t*)0x200006c0 = 0x20000300;
  memcpy((void*)0x20000300, "kfree\000", 6);
  *(uint32_t*)0x200006c8 = r[2];
  syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200006c0ul, /*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);
  do_sandbox_none();
  return 0;
}