示例#1
0
文件: acl.c 项目: mdamt/linux
static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
{
	int i, count;
	struct posix_acl *acl;
	struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
	struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
	const char *end = value + size;

	if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
		return ERR_PTR(-EINVAL);

	count = f2fs_acl_count(size);
	if (count < 0)
		return ERR_PTR(-EINVAL);
	if (count == 0)
		return NULL;

	acl = posix_acl_alloc(count, GFP_NOFS);
	if (!acl)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < count; i++) {

		if ((char *)entry > end)
			goto fail;

		acl->a_entries[i].e_tag  = le16_to_cpu(entry->e_tag);
		acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);

		switch (acl->a_entries[i].e_tag) {
		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry_short));
			break;

		case ACL_USER:
			acl->a_entries[i].e_uid =
				make_kuid(&init_user_ns,
						le32_to_cpu(entry->e_id));
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry));
			break;
		case ACL_GROUP:
			acl->a_entries[i].e_gid =
				make_kgid(&init_user_ns,
						le32_to_cpu(entry->e_id));
			entry = (struct f2fs_acl_entry *)((char *)entry +
					sizeof(struct f2fs_acl_entry));
			break;
		default:
			goto fail;
		}
	}
	if ((char *)entry != end)
		goto fail;
	return acl;
fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}
示例#2
0
/*
 * Convert from filesystem to in-memory representation.
 */
static struct posix_acl *
ext2_acl_from_disk(const void *value, size_t size)
{
	const char *end = (char *)value + size;
	int n, count;
	struct posix_acl *acl;

	if (!value)
		return NULL;
	if (size < sizeof(ext2_acl_header))
		 return ERR_PTR(-EINVAL);
	if (((ext2_acl_header *)value)->a_version !=
	    cpu_to_le32(EXT2_ACL_VERSION))
		return ERR_PTR(-EINVAL);
	value = (char *)value + sizeof(ext2_acl_header);
	count = ext2_acl_count(size);
	if (count < 0)
		return ERR_PTR(-EINVAL);
	if (count == 0)
		return NULL;
	acl = posix_acl_alloc(count, GFP_KERNEL);
	if (!acl)
		return ERR_PTR(-ENOMEM);
	for (n=0; n < count; n++) {
		ext2_acl_entry *entry =
			(ext2_acl_entry *)value;
		if ((char *)value + sizeof(ext2_acl_entry_short) > end)
			goto fail;
		acl->a_entries[n].e_tag  = le16_to_cpu(entry->e_tag);
		acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
		switch(acl->a_entries[n].e_tag) {
			case ACL_USER_OBJ:
			case ACL_GROUP_OBJ:
			case ACL_MASK:
			case ACL_OTHER:
				value = (char *)value +
					sizeof(ext2_acl_entry_short);
				acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
				break;

			case ACL_USER:
			case ACL_GROUP:
				value = (char *)value + sizeof(ext2_acl_entry);
				if ((char *)value > end)
					goto fail;
				acl->a_entries[n].e_id =
					le32_to_cpu(entry->e_id);
				break;

			default:
				goto fail;
		}
	}
	if (value != end)
		goto fail;
	return acl;

fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}
示例#3
0
文件: acl.c 项目: 513855417/linux
static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size)
{
	void *end = value + size;
	struct jffs2_acl_header *header = value;
	struct jffs2_acl_entry *entry;
	struct posix_acl *acl;
	uint32_t ver;
	int i, count;

	if (!value)
		return NULL;
	if (size < sizeof(struct jffs2_acl_header))
		return ERR_PTR(-EINVAL);
	ver = je32_to_cpu(header->a_version);
	if (ver != JFFS2_ACL_VERSION) {
		JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver);
		return ERR_PTR(-EINVAL);
	}

	value += sizeof(struct jffs2_acl_header);
	count = jffs2_acl_count(size);
	if (count < 0)
		return ERR_PTR(-EINVAL);
	if (count == 0)
		return NULL;

	acl = posix_acl_alloc(count, GFP_KERNEL);
	if (!acl)
		return ERR_PTR(-ENOMEM);

	for (i=0; i < count; i++) {
		entry = value;
		if (value + sizeof(struct jffs2_acl_entry_short) > end)
			goto fail;
		acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag);
		acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm);
		switch (acl->a_entries[i].e_tag) {
			case ACL_USER_OBJ:
			case ACL_GROUP_OBJ:
			case ACL_MASK:
			case ACL_OTHER:
				value += sizeof(struct jffs2_acl_entry_short);
				break;

			case ACL_USER:
				value += sizeof(struct jffs2_acl_entry);
				if (value > end)
					goto fail;
				acl->a_entries[i].e_uid =
					make_kuid(&init_user_ns,
						  je32_to_cpu(entry->e_id));
				break;
			case ACL_GROUP:
				value += sizeof(struct jffs2_acl_entry);
				if (value > end)
					goto fail;
				acl->a_entries[i].e_gid =
					make_kgid(&init_user_ns,
						  je32_to_cpu(entry->e_id));
				break;

			default:
				goto fail;
		}
	}
	if (value != end)
		goto fail;
	return acl;
 fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}