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Bruce Fields" , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 19/35] nfsd: Ensure we don't recognise lock stateids after freeing them Thread-Topic: [PATCH AUTOSEL for 4.4 19/35] nfsd: Ensure we don't recognise lock stateids after freeing them Thread-Index: AQHTlMovgbOQNNu8H0+nH2sXgZDDMg== Date: Wed, 24 Jan 2018 04:17:02 +0000 Message-ID: <20180124041645.32420-19-alexander.levin@microsoft.com> References: <20180124041645.32420-1-alexander.levin@microsoft.com> In-Reply-To: <20180124041645.32420-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1094;7:BBJD4EzqdWqn/97dFWlyUi78pq700QJGwM5PlcAtosmm6LKwma37GG9q8NssYrSIE9sSTEMu4Q6uEEPOz9+dT6rqAxfuEP+sy5ugEm9hCpjP/OGYsOJ5wXy+Ol84YOewsjzzz0Bi2nXM9EZVUGvtzUHI4yDJ8Fhjxnl6SZXHQ/BEXeM3ylEFwqa/+odUJo69oVx0w0tulWrr5/th8RBaKHmpjCs1cWYvclHTBvSRxhjS9f4AjX05A3H/CwMMuHW/ x-ms-office365-filtering-correlation-id: de5cccc8-3c3e-47df-d226-08d562e1a569 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(2017052603307)(7193020);SRVR:DM5PR2101MB1094; x-ms-traffictypediagnostic: DM5PR2101MB1094: x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(61425038)(6040501)(2401047)(8121501046)(5005006)(3231046)(2400081)(944501161)(10201501046)(3002001)(93006095)(93001095)(6055026)(61426038)(61427038)(6041288)(20161123558120)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123562045)(20161123560045)(20161123564045)(6072148)(201708071742011);SRVR:DM5PR2101MB1094;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB1094; x-forefront-prvs: 056297E276 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(346002)(376002)(396003)(366004)(39860400002)(39380400002)(199004)(189003)(14454004)(99286004)(10090500001)(2906002)(86612001)(2900100001)(2950100002)(575784001)(107886003)(5250100002)(2501003)(26005)(316002)(4326008)(97736004)(54906003)(106356001)(110136005)(25786009)(6666003)(5660300001)(36756003)(305945005)(86362001)(8936002)(3280700002)(6116002)(68736007)(102836004)(3660700001)(6512007)(10290500003)(72206003)(1076002)(105586002)(6436002)(22452003)(59450400001)(53936002)(478600001)(3846002)(7736002)(6486002)(6346003)(81156014)(66066001)(6506007)(8676002)(76176011)(81166006)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB1094;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;A:1;MX:1;LANG:en; authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: qO1q2A4Drb+nZz1iB5KXIfW31U9T1UXqq/1CD3ho7c7VMyDQM88scZB/U3H53sMLPRPXuE8kQKXqRYBWUawi1g== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: de5cccc8-3c3e-47df-d226-08d562e1a569 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jan 2018 04:17:02.1342 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1094 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Trond Myklebust [ Upstream commit 659aefb68eca28ba9aa482a9fc64de107332e256 ] In order to deal with lookup races, nfsd4_free_lock_stateid() needs to be able to signal to other stateful functions that the lock stateid is no longer valid. Right now, nfsd_lock() will check whether or not an existing stateid is still hashed, but only in the "new lock" path. To ensure the stateid invalidation is also recognised by the "existing lock= " path, and also by a second call to nfsd4_free_lock_stateid() itself, we can change the type to NFS4_CLOSED_STID under the stp->st_mutex. Signed-off-by: Trond Myklebust Signed-off-by: J. Bruce Fields Signed-off-by: Sasha Levin --- fs/nfsd/nfs4state.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index d31b6cdefb9d..439f01a0bc49 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -4934,7 +4934,9 @@ nfsd4_free_lock_stateid(stateid_t *stateid, struct nf= s4_stid *s) struct nfs4_ol_stateid *stp =3D openlockstateid(s); __be32 ret; =20 - mutex_lock(&stp->st_mutex); + ret =3D nfsd4_lock_ol_stateid(stp); + if (ret) + goto out_put_stid; =20 ret =3D check_stateid_generation(stateid, &s->sc_stateid, 1); if (ret) @@ -4945,11 +4947,13 @@ nfsd4_free_lock_stateid(stateid_t *stateid, struct = nfs4_stid *s) lockowner(stp->st_stateowner))) goto out; =20 + stp->st_stid.sc_type =3D NFS4_CLOSED_STID; release_lock_stateid(stp); ret =3D nfs_ok; =20 out: mutex_unlock(&stp->st_mutex); +out_put_stid: nfs4_put_stid(s); return ret; } @@ -5489,6 +5493,8 @@ find_lock_stateid(struct nfs4_lockowner *lo, struct n= fs4_file *fp) lockdep_assert_held(&clp->cl_lock); =20 list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) { + if (lst->st_stid.sc_type !=3D NFS4_LOCK_STID) + continue; if (lst->st_stid.sc_file =3D=3D fp) { atomic_inc(&lst->st_stid.sc_count); return lst; @@ -5563,7 +5569,6 @@ lookup_or_create_lock_state(struct nfsd4_compound_sta= te *cstate, struct nfs4_lockowner *lo; struct nfs4_ol_stateid *lst; unsigned int strhashval; - bool hashed; =20 lo =3D find_lockowner_str(cl, &lock->lk_new_owner); if (!lo) { @@ -5586,15 +5591,7 @@ retry: goto out; } =20 - mutex_lock(&lst->st_mutex); - - /* See if it's still hashed to avoid race with FREE_STATEID */ - spin_lock(&cl->cl_lock); - hashed =3D !list_empty(&lst->st_perfile); - spin_unlock(&cl->cl_lock); - - if (!hashed) { - mutex_unlock(&lst->st_mutex); + if (nfsd4_lock_ol_stateid(lst) !=3D nfs_ok) { nfs4_put_stid(&lst->st_stid); goto retry; } --=20 2.11.0