When mapping NFS identities using the NFSv4 idmapper, we want to substitute
for the uids and gids that would normally go on the wire as part of a
NFSv3 request. So we use the same mapping in the NFSv4 upcall as we
use in the NFSv3 RPC call (i.e. the mapping stored in the rpc_clnt cred).
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/nfs4idmap.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/fs/nfs/nfs4idmap.c b/fs/nfs/nfs4idmap.c
index bf34ddaa2ad7..4884fdae28fb 100644
--- a/fs/nfs/nfs4idmap.c
+++ b/fs/nfs/nfs4idmap.c
@@ -69,8 +69,16 @@ struct idmap {
struct rpc_pipe *idmap_pipe;
struct idmap_legacy_upcalldata *idmap_upcall_data;
struct mutex idmap_mutex;
+ const struct cred *cred;
};
+static struct user_namespace *idmap_userns(const struct idmap *idmap)
+{
+ if (idmap && idmap->cred)
+ return idmap->cred->user_ns;
+ return &init_user_ns;
+}
+
/**
* nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
* @fattr: fully initialised struct nfs_fattr
@@ -271,14 +279,15 @@ static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
const char *type, struct idmap *idmap)
{
char *desc;
- struct key *rkey;
+ struct key *rkey = ERR_PTR(-EAGAIN);
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 (!idmap->cred || idmap->cred->user_ns == &init_user_ns)
+ 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,
@@ -452,6 +461,9 @@ nfs_idmap_new(struct nfs_client *clp)
if (idmap == NULL)
return -ENOMEM;
+ mutex_init(&idmap->idmap_mutex);
+ idmap->cred = get_cred(clp->cl_rpcclient->cl_cred);
+
rpc_init_pipe_dir_object(&idmap->idmap_pdo,
&nfs_idmap_pipe_dir_object_ops,
idmap);
@@ -462,7 +474,6 @@ nfs_idmap_new(struct nfs_client *clp)
goto err;
}
idmap->idmap_pipe = pipe;
- mutex_init(&idmap->idmap_mutex);
error = rpc_add_pipe_dir_object(clp->cl_net,
&clp->cl_rpcclient->cl_pipedir_objects,
@@ -475,6 +486,7 @@ nfs_idmap_new(struct nfs_client *clp)
err_destroy_pipe:
rpc_destroy_pipe_data(idmap->idmap_pipe);
err:
+ put_cred(idmap->cred);
kfree(idmap);
return error;
}
@@ -491,6 +503,7 @@ nfs_idmap_delete(struct nfs_client *clp)
&clp->cl_rpcclient->cl_pipedir_objects,
&idmap->idmap_pdo);
rpc_destroy_pipe_data(idmap->idmap_pipe);
+ put_cred(idmap->cred);
kfree(idmap);
}
@@ -735,7 +748,7 @@ int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_
if (!nfs_map_string_to_numeric(name, namelen, &id))
ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap);
if (ret == 0) {
- *uid = make_kuid(&init_user_ns, id);
+ *uid = make_kuid(idmap_userns(idmap), id);
if (!uid_valid(*uid))
ret = -ERANGE;
}
@@ -752,7 +765,7 @@ int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size
if (!nfs_map_string_to_numeric(name, namelen, &id))
ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap);
if (ret == 0) {
- *gid = make_kgid(&init_user_ns, id);
+ *gid = make_kgid(idmap_userns(idmap), id);
if (!gid_valid(*gid))
ret = -ERANGE;
}
@@ -766,7 +779,7 @@ int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf,
int ret = -EINVAL;
__u32 id;
- id = from_kuid(&init_user_ns, uid);
+ id = from_kuid_munged(idmap_userns(idmap), uid);
if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap);
if (ret < 0)
@@ -780,7 +793,7 @@ int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf,
int ret = -EINVAL;
__u32 id;
- id = from_kgid(&init_user_ns, gid);
+ id = from_kgid_munged(idmap_userns(idmap), gid);
if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap);
if (ret < 0)
--
2.21.0
