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Bruce Fields" , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 159/162] nfsd: return RESOURCE not GARBAGE_ARGS on too many ops Thread-Topic: [PATCH AUTOSEL for 4.4 159/162] nfsd: return RESOURCE not GARBAGE_ARGS on too many ops Thread-Index: AQHTz5nh1njdyeSiV0abDaDhuizbwA== Date: Mon, 9 Apr 2018 00:29:55 +0000 Message-ID: <20180409002738.163941-159-alexander.levin@microsoft.com> References: <20180409002738.163941-1-alexander.levin@microsoft.com> In-Reply-To: <20180409002738.163941-1-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;DM5PR2101MB1125;7:dOqbeOGtrmIxyDaXpB4bX4aAy2RfHntzH1o05KuMSPvsQzzZ8KlPLtoUVeTZt3UN6p1wRO8ERCLlv7g05u3wjBaejdmkduZoqbAirQwpPHxiVrwef9psnAPSBCmg4rLrwe4h0hNkT7ga8rEI3emKigYWPCbIojcT2YIrMnRXwB8IJIt4bAIx41xLKwcjygO3Mctz33twhlKIMz/Cbn61e4MQi+eXszDIpAaTfzEQBG488IYIAbk6TdQ6LeD+sPq9;20:MxTrgFp5Q/s+BktFm433JDwrUl+wwe5k3ocbKbvwRNWLNmWX5trl7EYxV+KC155gFOYcmy4BRQhmEMq89UwVAomcCO1/g/rQpogeg6+zhQR1OhVlezudHvVm3mggHFbGiCvHn5a+MGp9Meq9T/N9Rl3nSJPkzN89wGdlbL8BTvc= X-MS-Office365-Filtering-Correlation-Id: 46ba8a9e-a10c-4526-678c-08d59db2568e x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(4534165)(4627221)(201703031133081)(201702281549075)(5600026)(4604075)(3008032)(48565401081)(2017052603328)(7193020);SRVR:DM5PR2101MB1125; x-ms-traffictypediagnostic: DM5PR2101MB1125: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(170618885588394); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040522)(2401047)(8121501046)(5005006)(3231221)(944501327)(52105095)(3002001)(93006095)(93001095)(10201501046)(6055026)(61426038)(61427038)(6041310)(20161123560045)(20161123564045)(20161123558120)(20161123562045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(6072148)(201708071742011);SRVR:DM5PR2101MB1125;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB1125; x-forefront-prvs: 0637FCE711 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(346002)(39860400002)(39380400002)(366004)(376002)(396003)(189003)(199004)(2906002)(25786009)(6512007)(10090500001)(3280700002)(10290500003)(6666003)(3660700001)(316002)(110136005)(54906003)(11346002)(107886003)(2616005)(476003)(446003)(36756003)(99286004)(86612001)(53936002)(4326008)(486006)(6436002)(3846002)(81156014)(305945005)(5250100002)(1076002)(102836004)(14454004)(66066001)(7736002)(105586002)(81166006)(59450400001)(106356001)(8676002)(97736004)(6116002)(6506007)(6486002)(5660300001)(186003)(76176011)(22452003)(72206003)(478600001)(2501003)(2900100001)(26005)(86362001)(575784001)(8936002)(68736007)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB1125;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; x-microsoft-antispam-message-info: 1Ahh+DiZhx8XgPXaPH8rbxmLO0ao2+DkgkzRu1XFXWamYWKlZf1MQVCGZokIzBy/JHB0N7gfKrSDZIgp6u8x4NZyE27wi1cfpURbHHmGBkaQGrJ4X0s+rHSFOVWOcNYIKzr4DvwoNzEAk0RLstpopxlMTlhi6702/JN9K48MhOnkjF8J8mI9qzdJRDr9iuUnK2dTW5ht+9giUfUZOA063fzgTA1RHLVWWebBfkxJNTFVvasYBbSeSdA/vzI6N667ei2NNs2lCc9eP4m9o1/gPDHSW6pMzy85+41BUkz1QTUE2rOBOt3O4E5kebBionGhj3173BGI0UwcuPPY6I7EbZ7NHk/NjkYJ/qXzt3mMuDepYm3JniKaPy/Dc8tz/jTCdfdZMJiBhSBWMZnV104fG1QsLEoMhaigGqaeoiOgOnQ= 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: 46ba8a9e-a10c-4526-678c-08d59db2568e X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:29:55.0528 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1125 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: "J. Bruce Fields" [ Upstream commit 0078117c6d9160031b866cfa1853514d4f6865d2 ] A client that sends more than a hundred ops in a single compound currently gets an rpc-level GARBAGE_ARGS error. It would be more helpful to return NFS4ERR_RESOURCE, since that gives the client a better idea how to recover (for example by splitting up the compound into smaller compounds). This is all a bit academic since we've never actually seen a reason for clients to send such long compounds, but we may as well fix it. While we're there, just use NFSD4_MAX_OPS_PER_COMPOUND =3D=3D 16, the constant we already use in the 4.1 case, instead of hard-coding 100. Chances anyone actually uses even 16 ops per compound are small enough that I think there's a neglible risk or any regression. This fixes pynfs test COMP6. Reported-by: "Lu, Xinyu" Signed-off-by: J. Bruce Fields Signed-off-by: Sasha Levin --- fs/nfsd/nfs4proc.c | 3 +++ fs/nfsd/nfs4xdr.c | 9 +++++++-- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index bfbee8ddf978..8f35f0a15bfa 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1627,6 +1627,9 @@ nfsd4_proc_compound(struct svc_rqst *rqstp, status =3D nfserr_minor_vers_mismatch; if (nfsd_minorversion(args->minorversion, NFSD_TEST) <=3D 0) goto out; + status =3D nfserr_resource; + if (args->opcnt > NFSD_MAX_OPS_PER_COMPOUND) + goto out; =20 status =3D nfs41_check_op_ordering(args); if (status) { diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 544672b440de..5ad02bdb62a3 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1824,8 +1824,13 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *arg= p) =20 if (argp->taglen > NFSD4_MAX_TAGLEN) goto xdr_error; - if (argp->opcnt > 100) - goto xdr_error; + /* + * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS + * here, so we return success at the xdr level so that + * nfsd4_proc can handle this is an NFS-level error. + */ + if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND) + return 0; =20 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { argp->ops =3D kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); --=20 2.15.1