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nfsd4: enforce per-client sessions/no-sessions distinction
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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>
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J. Bruce Fields committed Oct 1, 2012
1 parent c116a0a commit d15c077
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Showing 3 changed files with 31 additions and 22 deletions.
2 changes: 1 addition & 1 deletion fs/nfsd/nfs4proc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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:
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49 changes: 29 additions & 20 deletions fs/nfsd/nfs4state.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
}
Expand All @@ -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;
}
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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,
Expand Down Expand Up @@ -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;
}
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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. */
Expand Down Expand Up @@ -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);
Expand All @@ -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);
Expand Down Expand Up @@ -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));
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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;

Expand Down
2 changes: 1 addition & 1 deletion fs/nfsd/state.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
Expand Down

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