nfsd4: enforce per-client sessions/no-sessions distinction

Something like creating a client with setclientid and then trying to
confirm it with create_session may not crash the server, but I'm not
completely positive of that, and in any case it's obviously bad client
behavior.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

3 files changed, 31 insertions, 22 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index f2bb0ef67b2a..6c9a4b291dba 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -370,7 +370,7 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                         break;
                 case NFS4_OPEN_CLAIM_PREVIOUS:
                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
-                        status = nfs4_check_open_reclaim(&open->op_clientid);
+                        status = nfs4_check_open_reclaim(&open->op_clientid, cstate->minorversion);
                         if (status)
                                 goto out;
                 case NFS4_OPEN_CLAIM_FH:
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 73029cd0c5b6..550784219030 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1356,13 +1356,15 @@ move_to_confirmed(struct nfs4_client *clp)
 }
 
 static struct nfs4_client *
-find_confirmed_client(clientid_t *clid)
+find_confirmed_client(clientid_t *clid, bool sessions)
 {
         struct nfs4_client *clp;
         unsigned int idhashval = clientid_hashval(clid->cl_id);
 
         list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
                 if (same_clid(&clp->cl_clientid, clid)) {
+                        if ((bool)clp->cl_minorversion != sessions)
+                                return NULL;
                         renew_client(clp);
                         return clp;
                 }
@@ -1371,14 +1373,17 @@ find_confirmed_client(clientid_t *clid)
 }
 
 static struct nfs4_client *
-find_unconfirmed_client(clientid_t *clid)
+find_unconfirmed_client(clientid_t *clid, bool sessions)
 {
         struct nfs4_client *clp;
         unsigned int idhashval = clientid_hashval(clid->cl_id);
 
         list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
-                if (same_clid(&clp->cl_clientid, clid))
+                if (same_clid(&clp->cl_clientid, clid)) {
+                        if ((bool)clp->cl_minorversion != sessions)
+                                return NULL;
                         return clp;
+                }
         }
         return NULL;
 }
@@ -1768,8 +1773,8 @@ nfsd4_create_session(struct svc_rqst *rqstp,
                 return nfserr_inval;
 
         nfs4_lock_state();
-        unconf = find_unconfirmed_client(&cr_ses->clientid);
-        conf = find_confirmed_client(&cr_ses->clientid);
+        unconf = find_unconfirmed_client(&cr_ses->clientid, true);
+        conf = find_confirmed_client(&cr_ses->clientid, true);
 
         if (conf) {
                 cs_slot = &conf->cl_cs_slot;
@@ -2096,8 +2101,8 @@ nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *csta
         __be32 status = 0;
 
         nfs4_lock_state();
-        unconf = find_unconfirmed_client(&dc->clientid);
-        conf = find_confirmed_client(&dc->clientid);
+        unconf = find_unconfirmed_client(&dc->clientid, true);
+        conf = find_confirmed_client(&dc->clientid, true);
 
         if (conf) {
                 clp = conf;
@@ -2239,8 +2244,8 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
                 return nfserr_stale_clientid;
         nfs4_lock_state();
 
-        conf = find_confirmed_client(clid);
-        unconf = find_unconfirmed_client(clid);
+        conf = find_confirmed_client(clid, false);
+        unconf = find_unconfirmed_client(clid, false);
         /*
          * We try hard to give out unique clientid's, so if we get an
          * attempt to confirm the same clientid with a different cred,
@@ -2454,16 +2459,20 @@ same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
 }
 
 static struct nfs4_openowner *
-find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
+find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open, bool sessions)
 {
         struct nfs4_stateowner *so;
         struct nfs4_openowner *oo;
+        struct nfs4_client *clp;
 
         list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
                 if (!so->so_is_open_owner)
                         continue;
                 if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
                         oo = openowner(so);
+                        clp = oo->oo_owner.so_client;
+                        if ((bool)clp->cl_minorversion != sessions)
+                                return NULL;
                         renew_client(oo->oo_owner.so_client);
                         return oo;
                 }
@@ -2607,10 +2616,10 @@ nfsd4_process_open1(struct nfsd4_compound_state *cstate,
                 return nfserr_jukebox;
 
         strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
-        oo = find_openstateowner_str(strhashval, open);
+        oo = find_openstateowner_str(strhashval, open, cstate->minorversion);
         open->op_openowner = oo;
         if (!oo) {
-                clp = find_confirmed_client(clientid);
+                clp = find_confirmed_client(clientid, cstate->minorversion);
                 if (clp == NULL)
                         return nfserr_expired;
                 goto new_owner;
@@ -3107,7 +3116,7 @@ nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         status = nfserr_stale_clientid;
         if (STALE_CLIENTID(clid, nn))
                 goto out;
-        clp = find_confirmed_client(clid);
+        clp = find_confirmed_client(clid, cstate->minorversion);
         status = nfserr_expired;
         if (clp == NULL) {
                 /* We assume the client took too long to RENEW. */
@@ -3375,7 +3384,7 @@ static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
         return nfs_ok;
 }
 
-static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s)
+static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s, bool sessions)
 {
         struct nfs4_client *cl;
         struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
@@ -3384,7 +3393,7 @@ static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, s
                 return nfserr_bad_stateid;
         if (STALE_STATEID(stateid, nn))
                 return nfserr_stale_stateid;
-        cl = find_confirmed_client(&stateid->si_opaque.so_clid);
+        cl = find_confirmed_client(&stateid->si_opaque.so_clid, sessions);
         if (!cl)
                 return nfserr_expired;
         *s = find_stateid_by_type(cl, stateid, typemask);
@@ -3417,7 +3426,7 @@ nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
                 return check_special_stateids(net, current_fh, stateid, flags);
 
-        status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s);
+        status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s, cstate->minorversion);
         if (status)
                 return status;
         status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
@@ -3567,7 +3576,7 @@ nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
                 seqid, STATEID_VAL(stateid));
 
         *stpp = NULL;
-        status = nfsd4_lookup_stateid(stateid, typemask, &s);
+        status = nfsd4_lookup_stateid(stateid, typemask, &s, cstate->minorversion);
         if (status)
                 return status;
         *stpp = openlockstateid(s);
@@ -3805,7 +3814,7 @@ nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         inode = cstate->current_fh.fh_dentry->d_inode;
 
         nfs4_lock_state();
-        status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s);
+        status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s, cstate->minorversion);
         if (status)
                 goto out;
         dp = delegstateid(s);
@@ -4533,12 +4542,12 @@ nfsd4_find_reclaim_client(struct nfs4_client *clp)
 * Called from OPEN. Look for clientid in reclaim list.
 */
 __be32
-nfs4_check_open_reclaim(clientid_t *clid)
+nfs4_check_open_reclaim(clientid_t *clid, bool sessions)
 {
         struct nfs4_client *clp;
 
         /* find clientid in conf_id_hashtbl */
-        clp = find_confirmed_client(clid);
+        clp = find_confirmed_client(clid, sessions);
         if (clp == NULL)
                 return nfserr_reclaim_bad;
 
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index ec513fd4bae9..e036894bce57 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -455,7 +455,7 @@ extern void nfs4_unlock_state(void);
 extern int nfs4_in_grace(void);
 extern void nfs4_release_reclaim(void);
 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(struct nfs4_client *crp);
-extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
+extern __be32 nfs4_check_open_reclaim(clientid_t *clid, bool sessions);
 extern void nfs4_free_openowner(struct nfs4_openowner *);
 extern void nfs4_free_lockowner(struct nfs4_lockowner *);
 extern int set_callback_cred(void);