// https://syzkaller.appspot.com/bug?id=833e9c2f24710d6ca275451770a7693aca5f7339
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.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 <unistd.h>

#include <linux/capability.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

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

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  memcpy((void*)0x200001c0, "/dev/udmabuf\000", 13);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200001c0ul,
                /*flags=*/2ul, 0);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x200003c0,
         "y\0205\373\367u\203%:r\302\271x\244q\301\352_"
         "\214Z7\347a\233\021x\016\241\317\032\230S7\311\000\000\000\000\000"
         "\000\a\000\000\000\000\000\000\004\2079\2424\251am\336\262\323\313ZJo"
         "a\304\032cB\252\301\373 "
         "Q\324\364\001\2452\342DG\324\275{\237\251\227\233@"
         "\333\000b\341br\266\3527\343\020\377\302\235\r2\236\216\004sW\033\267"
         "\263\242\311&@\312\332\334\342/"
         "\227X\254\b\260\302<"
         "\200E\032\274\307W\3329VsA\257\306\317\341\241\265M\242\205\246y\304J"
         "\361\367\374D\225\343\353\017<\221\260\250\236o\353F("
         "\235L\001vRk\252cB\004\247I\v\206EZ\226\325\024OD\\\350R\344\315\354"
         "\314\321\017re\3506\315\353\304$\230\006J\326dD\215_U`ji{"
         "\253\227\257;l\037\257\2638U\313\372\263j\222\f\201\240\242-"
         "g\b\231\016\215\215\026\331w\\\370\316\260j\235\'\223\357\035\240H"
         "\315\275\331\257\022$\215\026%\213\000\325\363\\\000\276]Et\255*"
         "\354j\002\310\304\f\004\231\366\374",
         292);
  res = syscall(__NR_memfd_create, /*name=*/0x200003c0ul,
                /*flags=MFD_ALLOW_SEALING*/ 2ul);
  if (res != -1)
    r[1] = res;
  syscall(__NR_ftruncate, /*fd=*/r[1], /*len=*/0xfffful);
  syscall(__NR_fcntl, /*fd=*/r[1], /*cmd=*/0x409ul,
          /*seals=F_SEAL_GROW|F_SEAL_SHRINK|F_SEAL_SEAL*/ 7ul);
  *(uint32_t*)0x200002c0 = r[1];
  *(uint32_t*)0x200002c4 = 0;
  *(uint64_t*)0x200002c8 = 0;
  *(uint64_t*)0x200002d0 = 0x1000;
  res = syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x40187542,
                /*arg=*/0x200002c0ul);
  if (res != -1)
    r[2] = res;
  res = syscall(__NR_fcntl, /*fd=*/r[2], /*cmd=*/0ul, /*arg=*/r[2]);
  if (res != -1)
    r[3] = res;
  syscall(__NR_mmap, /*addr=*/0x20ffd000ul, /*len=*/0x1000ul,
          /*prot=PROT_WRITE*/ 2ul,
          /*flags=MAP_SHARED_VALIDATE|MAP_POPULATE|MAP_FIXED*/ 0x8013ul,
          /*fd=*/r[3], /*offset=*/0ul);
  close_fds();
}
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;
}