static ssize_t nfs_idmap_request_key(struct key_type *key_type,
const char *name, size_t namelen,
const char *type, void *data,
size_t data_size, struct idmap *idmap)
{
const struct cred *saved_cred;
struct key *rkey;
char *desc;
struct user_key_payload *payload;
ssize_t ret;
ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
if (ret <= 0)
goto out;
saved_cred = override_creds(id_resolver_cache);
if (idmap)
rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap);
else
rkey = request_key(&key_type_id_resolver, desc, "");
revert_creds(saved_cred);
kfree(desc);
if (IS_ERR(rkey)) {
ret = PTR_ERR(rkey);
goto out;
}
rcu_read_lock();
rkey->perm |= KEY_USR_VIEW;
ret = key_validate(rkey);
if (ret < 0)
goto out_up;
payload = rcu_dereference(rkey->payload.data);
if (IS_ERR_OR_NULL(payload)) {
ret = PTR_ERR(payload);
goto out_up;
}
ret = payload->datalen;
if (ret > 0 && ret <= data_size)
memcpy(data, payload->data, ret);
else
ret = -EINVAL;
out_up:
rcu_read_unlock();
key_put(rkey);
out:
return ret;
}
static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
const char *type, struct idmap *idmap)
{
char *desc;
struct key *rkey;
ssize_t ret;
ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
if (ret <= 0)
return ERR_PTR(ret);
rkey = request_key(&key_type_id_resolver, desc, "");
if (IS_ERR(rkey)) {
mutex_lock(&idmap->idmap_mutex);
rkey = request_key_with_auxdata(&key_type_id_resolver_legacy,
desc, "", 0, idmap);
mutex_unlock(&idmap->idmap_mutex);
}
if (!IS_ERR(rkey))
set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);
kfree(desc);
return rkey;
}