// https://syzkaller.appspot.com/bug?id=df4f17e2c28d3dea6a0ff7598304e55f5ebe292a
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#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 <unistd.h>

#include <linux/capability.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

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 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;
}

static void setup_gadgetfs();
static void setup_binderfs();
static void setup_fusectl();
static void sandbox_common_mount_tmpfs(void)
{
  write_file("/proc/sys/fs/mount-max", "100000");
  if (mkdir("./syz-tmp", 0777))
    exit(1);
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot", 0777))
    exit(1);
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    exit(1);
  unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    exit(1);
  if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    exit(1);
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) {
    if (errno != ENOENT)
      exit(1);
    if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) &&
        errno != ENOENT)
      exit(1);
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    exit(1);
  if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL))
    exit(1);
  if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/proc/sys/fs/binfmt_misc",
            "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags,
            NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/newroot/syz-inputs", 0700))
    exit(1);
  if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL,
            bind_mount_flags | MS_RDONLY, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/pivot", 0777))
    exit(1);
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      exit(1);
  } else {
    if (chdir("/"))
      exit(1);
    if (umount2("./pivot", MNT_DETACH))
      exit(1);
  }
  if (chroot("./newroot"))
    exit(1);
  if (chdir("/"))
    exit(1);
  setup_gadgetfs();
  setup_binderfs();
  setup_fusectl();
}

static void setup_gadgetfs()
{
  if (mkdir("/dev/gadgetfs", 0777)) {
  }
  if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) {
  }
}

static void setup_fusectl()
{
  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);
  if (getppid() == 1)
    exit(1);
  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);
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  sandbox_common_mount_tmpfs();
  loop();
  exit(1);
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  NONFAILING(*(uint32_t*)0x4000000005c0 = 0);
  NONFAILING(*(uint32_t*)0x4000000005c4 = 0xc);
  NONFAILING(*(uint64_t*)0x4000000005c8 = 0x400000000440);
  NONFAILING(memcpy((void*)0x400000000440,
                    "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff"
                    "\xff\x00\x18\x11\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x400000000454 = -1);
  NONFAILING(memcpy(
      (void*)0x400000000458,
      "\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\x08\x00\x00\x00\xb7\x04\x00\x00\x00\x00"
      "\x00\x00\x85\x00\x00\x00\x82\x00\x00\x00\x95",
      65));
  NONFAILING(*(uint64_t*)0x4000000005d0 = 0);
  NONFAILING(*(uint32_t*)0x4000000005d8 = 0);
  NONFAILING(*(uint32_t*)0x4000000005dc = 0);
  NONFAILING(*(uint64_t*)0x4000000005e0 = 0);
  NONFAILING(*(uint32_t*)0x4000000005e8 = 0);
  NONFAILING(*(uint32_t*)0x4000000005ec = 0x4e);
  NONFAILING(memset((void*)0x4000000005f0, 0, 16));
  NONFAILING(*(uint32_t*)0x400000000600 = 0);
  NONFAILING(*(uint32_t*)0x400000000604 = 0x14);
  NONFAILING(*(uint32_t*)0x400000000608 = -1);
  NONFAILING(*(uint32_t*)0x40000000060c = 0);
  NONFAILING(*(uint64_t*)0x400000000610 = 0);
  NONFAILING(*(uint32_t*)0x400000000618 = 0);
  NONFAILING(*(uint32_t*)0x40000000061c = 0);
  NONFAILING(*(uint64_t*)0x400000000620 = 0);
  NONFAILING(*(uint32_t*)0x400000000628 = 0);
  NONFAILING(*(uint32_t*)0x40000000062c = 0);
  NONFAILING(*(uint32_t*)0x400000000630 = 0);
  NONFAILING(*(uint32_t*)0x400000000634 = 0);
  NONFAILING(*(uint64_t*)0x400000000638 = 0);
  NONFAILING(*(uint64_t*)0x400000000640 = 0);
  NONFAILING(*(uint32_t*)0x400000000648 = 0);
  NONFAILING(*(uint32_t*)0x40000000064c = 0);
  NONFAILING(*(uint32_t*)0x400000000650 = 0);
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x4000000005c0ul, /*size=*/0x94ul);
  NONFAILING(*(uint32_t*)0x4000000000c0 = 0);
  NONFAILING(*(uint32_t*)0x4000000000c4 = 0xc);
  NONFAILING(*(uint64_t*)0x4000000000c8 = 0x400000000440);
  NONFAILING(memcpy((void*)0x400000000440,
                    "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x18\x12\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x400000000454 = -1);
  NONFAILING(
      memcpy((void*)0x400000000458,
             "\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\x08\x00\x00\x00"
             "\xb7\x04\x00\x00\xf6\x00\x00\x00\x85\x00\x00\x00\x43",
             61));
  NONFAILING(*(uint64_t*)0x4000000000d0 = 0);
  NONFAILING(*(uint32_t*)0x4000000000d8 = 0);
  NONFAILING(*(uint32_t*)0x4000000000dc = 0);
  NONFAILING(*(uint64_t*)0x4000000000e0 = 0);
  NONFAILING(*(uint32_t*)0x4000000000e8 = 0);
  NONFAILING(*(uint32_t*)0x4000000000ec = 0);
  NONFAILING(memset((void*)0x4000000000f0, 0, 16));
  NONFAILING(*(uint32_t*)0x400000000100 = 0);
  NONFAILING(*(uint32_t*)0x400000000104 = 0);
  NONFAILING(*(uint32_t*)0x400000000108 = -1);
  NONFAILING(*(uint32_t*)0x40000000010c = 0);
  NONFAILING(*(uint64_t*)0x400000000110 = 0);
  NONFAILING(*(uint32_t*)0x400000000118 = 0);
  NONFAILING(*(uint32_t*)0x40000000011c = 0);
  NONFAILING(*(uint64_t*)0x400000000120 = 0);
  NONFAILING(*(uint32_t*)0x400000000128 = 0);
  NONFAILING(*(uint32_t*)0x40000000012c = 0);
  NONFAILING(*(uint32_t*)0x400000000130 = 0);
  NONFAILING(*(uint32_t*)0x400000000134 = 0);
  NONFAILING(*(uint64_t*)0x400000000138 = 0);
  NONFAILING(*(uint64_t*)0x400000000140 = 0);
  NONFAILING(*(uint32_t*)0x400000000148 = 0);
  NONFAILING(*(uint32_t*)0x40000000014c = 0);
  NONFAILING(*(uint32_t*)0x400000000150 = 0);
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x4000000000c0ul, /*size=*/0x94ul);
  NONFAILING(*(uint32_t*)0x4000000000c0 = 0x1b);
  NONFAILING(*(uint32_t*)0x4000000000c4 = 0);
  NONFAILING(*(uint32_t*)0x4000000000c8 = 0);
  NONFAILING(*(uint32_t*)0x4000000000cc = 0x8000);
  NONFAILING(*(uint32_t*)0x4000000000d0 = 0);
  NONFAILING(*(uint32_t*)0x4000000000d4 = -1);
  NONFAILING(*(uint32_t*)0x4000000000d8 = 0);
  NONFAILING(memset((void*)0x4000000000dc, 0, 16));
  NONFAILING(*(uint32_t*)0x4000000000ec = 0);
  NONFAILING(*(uint32_t*)0x4000000000f0 = -1);
  NONFAILING(*(uint32_t*)0x4000000000f4 = 0);
  NONFAILING(*(uint32_t*)0x4000000000f8 = 0);
  NONFAILING(*(uint32_t*)0x4000000000fc = 0);
  NONFAILING(*(uint64_t*)0x400000000100 = 0);
  NONFAILING(*(uint32_t*)0x400000000108 = 0);
  NONFAILING(*(uint32_t*)0x40000000010c = 0);
  res =
      syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x4000000000c0ul, /*size=*/0x48ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x4000000000c0 = 0);
  NONFAILING(*(uint32_t*)0x4000000000c4 = 0xc);
  NONFAILING(*(uint64_t*)0x4000000000c8 = 0x400000000440);
  NONFAILING(memcpy((void*)0x400000000440,
                    "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x18\x12\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x400000000454 = r[0]);
  NONFAILING(*(uint64_t*)0x4000000000d0 = 0);
  NONFAILING(*(uint32_t*)0x4000000000d8 = 0);
  NONFAILING(*(uint32_t*)0x4000000000dc = 0);
  NONFAILING(*(uint64_t*)0x4000000000e0 = 0);
  NONFAILING(*(uint32_t*)0x4000000000e8 = 0);
  NONFAILING(*(uint32_t*)0x4000000000ec = 0);
  NONFAILING(memset((void*)0x4000000000f0, 0, 16));
  NONFAILING(*(uint32_t*)0x400000000100 = 0);
  NONFAILING(*(uint32_t*)0x400000000104 = 0);
  NONFAILING(*(uint32_t*)0x400000000108 = -1);
  NONFAILING(*(uint32_t*)0x40000000010c = 0);
  NONFAILING(*(uint64_t*)0x400000000110 = 0);
  NONFAILING(*(uint32_t*)0x400000000118 = 0);
  NONFAILING(*(uint32_t*)0x40000000011c = 0);
  NONFAILING(*(uint64_t*)0x400000000120 = 0);
  NONFAILING(*(uint32_t*)0x400000000128 = 0);
  NONFAILING(*(uint32_t*)0x40000000012c = 0);
  NONFAILING(*(uint32_t*)0x400000000130 = 0);
  NONFAILING(*(uint32_t*)0x400000000134 = 0);
  NONFAILING(*(uint64_t*)0x400000000138 = 0);
  NONFAILING(*(uint64_t*)0x400000000140 = 0);
  NONFAILING(*(uint32_t*)0x400000000148 = 0);
  NONFAILING(*(uint32_t*)0x40000000014c = 0);
  NONFAILING(*(uint32_t*)0x400000000150 = 0);
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x4000000000c0ul, /*size=*/0x94ul);
  NONFAILING(*(uint32_t*)0x4000000000c0 = 0x1f);
  NONFAILING(*(uint32_t*)0x4000000000c4 = 0xc);
  NONFAILING(*(uint64_t*)0x4000000000c8 = 0x400000000440);
  NONFAILING(*(uint64_t*)0x4000000000d0 = 0x400000000240);
  NONFAILING(memcpy((void*)0x400000000240, "GPL\000", 4));
  NONFAILING(*(uint32_t*)0x4000000000d8 = 0);
  NONFAILING(*(uint32_t*)0x4000000000dc = 0);
  NONFAILING(*(uint64_t*)0x4000000000e0 = 0);
  NONFAILING(*(uint32_t*)0x4000000000e8 = 0);
  NONFAILING(*(uint32_t*)0x4000000000ec = 0x12);
  NONFAILING(memset((void*)0x4000000000f0, 0, 16));
  NONFAILING(*(uint32_t*)0x400000000100 = 0);
  NONFAILING(*(uint32_t*)0x400000000104 = 0);
  NONFAILING(*(uint32_t*)0x400000000108 = -1);
  NONFAILING(*(uint32_t*)0x40000000010c = 0);
  NONFAILING(*(uint64_t*)0x400000000110 = 0);
  NONFAILING(*(uint32_t*)0x400000000118 = 0);
  NONFAILING(*(uint32_t*)0x40000000011c = 0);
  NONFAILING(*(uint64_t*)0x400000000120 = 0);
  NONFAILING(*(uint32_t*)0x400000000128 = 0);
  NONFAILING(*(uint32_t*)0x40000000012c = 0);
  NONFAILING(*(uint32_t*)0x400000000130 = 0);
  NONFAILING(*(uint32_t*)0x400000000134 = 0);
  NONFAILING(*(uint64_t*)0x400000000138 = 0);
  NONFAILING(*(uint64_t*)0x400000000140 = 0);
  NONFAILING(*(uint32_t*)0x400000000148 = 0);
  NONFAILING(*(uint32_t*)0x40000000014c = 0);
  NONFAILING(*(uint32_t*)0x400000000150 = 0);
  res =
      syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x4000000000c0ul, /*size=*/0x90ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint32_t*)0x400000000740 = r[1]);
  NONFAILING(*(uint32_t*)0x400000000744 = 0);
  NONFAILING(*(uint64_t*)0x400000000748 = 0);
  syscall(__NR_bpf, /*cmd=*/0xaul, /*arg=*/0x400000000740ul, /*size=*/0x10ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x3ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x400000000000ul, /*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=*/0x400001000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  do_sandbox_none();
  return 0;
}