From 2b63482185e6054cc11ca6d6c073f90160c161fd Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Thu, 15 Oct 2015 15:33:23 -0400 Subject: [PATCH] nfsd: fix clid_inuse on mount with security change In bakeathon testing Solaris client was getting CLID_INUSE error when doing a krb5 mount soon after an auth_sys mount, or vice versa. That's not really necessary since in this case the old client doesn't have any state any more: http://tools.ietf.org/html/rfc7530#page-103 "when the server gets a SETCLIENTID for a client ID that currently has no state, or it has state but the lease has expired, rather than returning NFS4ERR_CLID_INUSE, the server MUST allow the SETCLIENTID and confirm the new client ID if followed by the appropriate SETCLIENTID_CONFIRM." This doesn't fix the problem completely since our client_has_state() check counts openowners left around to handle close replays, which we should probably just remove in this case. Signed-off-by: J. Bruce Fields --- fs/nfsd/nfs4state.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 1b39edf..bac6207 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -2262,7 +2262,8 @@ static bool client_has_state(struct nfs4_client *clp) * Note clp->cl_openowners check isn't quite right: there's no * need to count owners without stateid's. * - * Also note we should probably be using this in 4.0 case too. + * Also note in 4.0 case should also be checking for openowners + * kept around just for close handling. */ return !list_empty(&clp->cl_openowners) #ifdef CONFIG_NFSD_PNFS @@ -3049,7 +3050,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, /* Cases below refer to rfc 3530 section 14.2.33: */ spin_lock(&nn->client_lock); conf = find_confirmed_client_by_name(&clname, nn); - if (conf) { + if (conf && client_has_state(conf)) { /* case 0: */ status = nfserr_clid_inuse; if (clp_used_exchangeid(conf)) @@ -3136,6 +3137,11 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp, } else { /* case 3: normal case; new or rebooted client */ old = find_confirmed_client_by_name(&unconf->cl_name, nn); if (old) { + status = nfserr_clid_inuse; + if (client_has_state(old) + && !same_creds(&unconf->cl_cred, + &old->cl_cred)) + goto out; status = mark_client_expired_locked(old); if (status) { old = NULL; -- 2.7.4