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dkim=none (message not signed) header.d=none;redhat.com; dmarc=none action=none header.from=virtuozzo.com; Received: from AM7PR08MB5494.eurprd08.prod.outlook.com (2603:10a6:20b:dc::15) by AS8PR08MB6805.eurprd08.prod.outlook.com (2603:10a6:20b:396::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3933.31; Fri, 12 Mar 2021 10:44:20 +0000 Received: from AM7PR08MB5494.eurprd08.prod.outlook.com ([fe80::f1f0:6610:11f5:5e4a]) by AM7PR08MB5494.eurprd08.prod.outlook.com ([fe80::f1f0:6610:11f5:5e4a%8]) with mapi id 15.20.3912.030; Fri, 12 Mar 2021 10:44:20 +0000 Subject: Re: [PATCH] stream: Don't crash when node permission is denied To: Kevin Wolf , qemu-block@nongnu.org Cc: ngu@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com References: <20210309173451.45152-1-kwolf@redhat.com> From: Vladimir Sementsov-Ogievskiy Message-ID: <4c5506fc-ebf6-a086-b1ef-dd2773823ec6@virtuozzo.com> Date: Fri, 12 Mar 2021 13:44:18 +0300 User-Agent: Mozilla/5.0 (X11; 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envelope-from=vsementsov@virtuozzo.com; helo=EUR03-AM5-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 09.03.2021 20:34, Kevin Wolf wrote: > The image streaming block job restricts shared permissions of the nodes > it accesses. This can obviously fail when other users already got these > permissions. &error_abort is therefore wrong and can crash. Handle these > errors gracefully and just fail starting the block job. > > Reported-by: Nini Gu > Signed-off-by: Kevin Wolf > --- > Based-on: 20210309121814.31078-1-kwolf@redhat.com > ('storage-daemon: Call job_cancel_sync_all() on shutdown') > > block/stream.c | 15 +++++++++++---- > tests/qemu-iotests/tests/qsd-jobs | 20 ++++++++++++++++++++ > tests/qemu-iotests/tests/qsd-jobs.out | 10 ++++++++++ > 3 files changed, 41 insertions(+), 4 deletions(-) > > diff --git a/block/stream.c b/block/stream.c > index 1fa742b0db..97bee482dc 100644 > --- a/block/stream.c > +++ b/block/stream.c > @@ -206,7 +206,7 @@ void stream_start(const char *job_id, BlockDriverState *bs, > const char *filter_node_name, > Error **errp) > { > - StreamBlockJob *s; > + StreamBlockJob *s = NULL; > BlockDriverState *iter; > bool bs_read_only; > int basic_flags = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED; > @@ -214,6 +214,7 @@ void stream_start(const char *job_id, BlockDriverState *bs, > BlockDriverState *cor_filter_bs = NULL; > BlockDriverState *above_base; > QDict *opts; > + int ret; > > assert(!(base && bottom)); > assert(!(backing_file_str && bottom)); > @@ -303,7 +304,7 @@ void stream_start(const char *job_id, BlockDriverState *bs, > * queried only at the job start and then cached. > */ > if (block_job_add_bdrv(&s->common, "active node", bs, 0, > - basic_flags | BLK_PERM_WRITE, &error_abort)) { > + basic_flags | BLK_PERM_WRITE, errp)) { While being here may also do ", errp) < 0) {", for more usual pattern of checking error.. > goto fail; > } > > @@ -320,8 +321,11 @@ void stream_start(const char *job_id, BlockDriverState *bs, > for (iter = bdrv_filter_or_cow_bs(bs); iter != base; > iter = bdrv_filter_or_cow_bs(iter)) > { > - block_job_add_bdrv(&s->common, "intermediate node", iter, 0, > - basic_flags, &error_abort); > + ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0, > + basic_flags, errp); > + if (ret < 0) { > + goto fail; > + } > } > > s->base_overlay = base_overlay; > @@ -337,6 +341,9 @@ void stream_start(const char *job_id, BlockDriverState *bs, > return; > > fail: > + if (s) { > + job_early_fail(&s->common.job); > + } > if (cor_filter_bs) { > bdrv_cor_filter_drop(cor_filter_bs); > } > diff --git a/tests/qemu-iotests/tests/qsd-jobs b/tests/qemu-iotests/tests/qsd-jobs > index 1a1c534fac..972b6b3898 100755 > --- a/tests/qemu-iotests/tests/qsd-jobs > +++ b/tests/qemu-iotests/tests/qsd-jobs > @@ -30,6 +30,7 @@ status=1 # failure is the default! > _cleanup() > { > _cleanup_test_img > + rm -f "$SOCK_DIR/nbd.sock" > } > trap "_cleanup; exit \$status" 0 1 2 3 15 > > @@ -59,6 +60,25 @@ $QSD --chardev stdio,id=stdio --monitor chardev=stdio \ > {"execute": "quit"} > EOF > > +echo > +echo "=== Streaming can't get permission on base node ===" > +echo > + > +# Just make sure that this doesn't crash > +$QSD --chardev stdio,id=stdio --monitor chardev=stdio \ > + --blockdev node-name=file_base,driver=file,filename="$TEST_IMG.base" \ > + --blockdev node-name=fmt_base,driver=qcow2,file=file_base \ > + --blockdev node-name=file_overlay,driver=file,filename="$TEST_IMG" \ > + --blockdev node-name=fmt_overlay,driver=qcow2,file=file_overlay,backing=fmt_base \ > + --nbd-server addr.type=unix,addr.path="$SOCK_DIR/nbd.sock" \ > + --export type=nbd,id=export1,node-name=fmt_base,writable=on,name=export1 \ Another option is to use blkdebug with take-child-perms and/or unshare-child-perms set. Just a note, nbd is good too. > + < +{"execute": "qmp_capabilities"} > +{"execute": "block-stream", > + "arguments": {"device": "fmt_overlay", "job-id": "job0"}} > +{"execute": "quit"} > +EOF > + > # success, all done > echo "*** done" > rm -f $seq.full > diff --git a/tests/qemu-iotests/tests/qsd-jobs.out b/tests/qemu-iotests/tests/qsd-jobs.out > index e3a684b34d..05e1165e80 100644 > --- a/tests/qemu-iotests/tests/qsd-jobs.out > +++ b/tests/qemu-iotests/tests/qsd-jobs.out > @@ -19,4 +19,14 @@ QMP_VERSION > {"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "BLOCK_JOB_COMPLETED", "data": {"device": "job0", "len": 0, "offset": 0, "speed": 0, "type": "commit"}} > {"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "concluded", "id": "job0"}} > {"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "null", "id": "job0"}} > + > +=== Streaming can't get permission on base node === > + > +QMP_VERSION > +{"return": {}} > +{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "created", "id": "job0"}} > +{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "null", "id": "job0"}} > +{"error": {"class": "GenericError", "desc": "Conflicts with use by a block device as 'root', which uses 'write' on fmt_base"}} > +{"return": {}} > +{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "BLOCK_EXPORT_DELETED", "data": {"id": "export1"}} > *** done > Reviewed-by: Vladimir Sementsov-Ogievskiy -- Best regards, Vladimir