int transfer_args_to_stack(struct linux_binprm *bprm,
			   unsigned long *sp_location)
{
	unsigned long index, stop, sp;
	int ret = 0;

	stop = bprm->p >> PAGE_SHIFT;
	sp = *sp_location;

	for (index = MAX_ARG_PAGES - 1; index >= stop; index--) {
		unsigned int offset = index == stop ? bprm->p & ~PAGE_MASK : 0;
		char *src = kmap(bprm->page[index]) + offset;
		sp -= PAGE_SIZE - offset;
		if (copy_to_user((void *) sp, src, PAGE_SIZE - offset) != 0)
			ret = -EFAULT;
		kunmap(bprm->page[index]);
		if (ret)
			goto out;
	}

	*sp_location = sp;

out:
	return ret;
}
Unknown