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Tue, 21 Mar 2023 10:50:46 +0000 From: Lei Lei2 Yin To: "kbusch@kernel.org" , "axboe@fb.com" , "hch@lst.de" , "sagi@grimberg.me" CC: "linux-nvme@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "cybeyond@foxmail.com" Subject: [PATCH] nvme: fix heap-use-after-free and oops in bio_endio for nvme multipath Thread-Topic: [PATCH] nvme: fix heap-use-after-free and oops in bio_endio for nvme multipath Thread-Index: Adlb4qYZRCgfva2qSAaoRzaKM2NfXg== Date: Tue, 21 Mar 2023 10:50:46 +0000 Message-ID: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: PS1PR03MB4939:EE_|SI2PR03MB6110:EE_ x-ms-office365-filtering-correlation-id: e8559bdb-68ab-420f-f6fd-08db29fa20a1 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PS1PR03MB4939.apcprd03.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230025)(4636009)(346002)(136003)(366004)(376002)(396003)(39860400002)(451199018)(83380400001)(6506007)(26005)(66476007)(71200400001)(478600001)(186003)(9686003)(7696005)(64756008)(66446008)(66556008)(76116006)(316002)(110136005)(54906003)(8676002)(66946007)(53546011)(4326008)(41300700001)(52536014)(8936002)(5660300002)(82960400001)(38100700002)(122000001)(2906002)(55016003)(86362001)(38070700005)(33656002);DIR:OUT;SFP:1102; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: lenovo.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PS1PR03MB4939.apcprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: e8559bdb-68ab-420f-f6fd-08db29fa20a1 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Mar 2023 10:50:46.8949 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5c7d0b28-bdf8-410c-aa93-4df372b16203 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: TT57+ehdZhmBjM/59+0HS8uCskkAKFIwfpPyJ6yf5oOkTBptgG1VLt4ffWTlW46PO246cwc9F7u0rSdagb/w/w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SI2PR03MB6110 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >From b134e7930b50679ce48e5522ddd37672b1802340 Mon Sep 17 00:00:00 2001 From: Lei Yin Date: Tue, 21 Mar 2023 16:09:08 +0800 Subject: [PATCH] nvme: fix heap-use-after-free and oops in bio_endio for nv= me multipath When blk_queue_split works in nvme_ns_head_submit_bio, input bio will be splited to two bios. If parent bio is completed first, and the bi_disk in parent bio is kfreed by nvme_free_ns, child will access this freed bi_disk in bio_endio. This will trigger heap-use-after-free or null pointer oops. The following is kasan report: BUG: KASAN: use-after-free in bio_endio+0x477/0x500 Read of size 8 at addr ffff888106f2e3a8 by task kworker/1:1H/241 CPU: 1 PID: 241 Comm: kworker/1:1H Kdump: loaded Tainted: G O 5.10.167 #1 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 Workqueue: kblockd nvme_requeue_work [nvme_core] Call Trace: dump_stack+0x92/0xc4 ? bio_endio+0x477/0x500 print_address_description.constprop.7+0x1e/0x230 ? record_print_text.cold.40+0x11/0x11 ? _raw_spin_trylock_bh+0x120/0x120 ? blk_throtl_bio+0x225/0x3050 ? bio_endio+0x477/0x500 ? bio_endio+0x477/0x500 kasan_report.cold.9+0x37/0x7c ? bio_endio+0x477/0x500 bio_endio+0x477/0x500 nvme_ns_head_submit_bio+0x950/0x1130 [nvme_core] ? nvme_find_path+0x7f0/0x7f0 [nvme_core] ? __kasan_slab_free+0x11a/0x150 ? bio_endio+0x213/0x500 submit_bio_noacct+0x2a4/0xd10 ? _dev_info+0xcd/0xff ? _dev_notice+0xff/0xff ? blk_queue_enter+0x6c0/0x6c0 ? _raw_spin_lock_irq+0x81/0xd5 ? _raw_spin_lock+0xd0/0xd0 nvme_requeue_work+0x144/0x18c [nvme_core] process_one_work+0x878/0x13e0 worker_thread+0x87/0xf70 ? __kthread_parkme+0x8f/0x100 ? process_one_work+0x13e0/0x13e0 kthread+0x30f/0x3d0 ? kthread_parkme+0x80/0x80 ret_from_fork+0x1f/0x30 Allocated by task 52: kasan_save_stack+0x19/0x40 __kasan_kmalloc.constprop.11+0xc8/0xd0 __alloc_disk_node+0x5c/0x320 nvme_alloc_ns+0x6e9/0x1520 [nvme_core] nvme_validate_or_alloc_ns+0x17c/0x370 [nvme_core] nvme_scan_work+0x2d4/0x4d0 [nvme_core] process_one_work+0x878/0x13e0 worker_thread+0x87/0xf70 kthread+0x30f/0x3d0 ret_from_fork+0x1f/0x30 Freed by task 54: kasan_save_stack+0x19/0x40 kasan_set_track+0x1c/0x30 kasan_set_free_info+0x1b/0x30 __kasan_slab_free+0x108/0x150 kfree+0xa7/0x300 device_release+0x98/0x210 kobject_release+0x109/0x3a0 nvme_free_ns+0x15e/0x1f7 [nvme_core] nvme_remove_namespaces+0x22f/0x390 [nvme_core] nvme_do_delete_ctrl+0xac/0x106 [nvme_core] process_one_work+0x878/0x13e0 worker_thread+0x87/0xf70 kthread+0x30f/0x3d0 ret_from_fork+0x1f/0x30 Signed-off-by: Lei Yin --- drivers/nvme/host/nvme.h | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index c3e4d9b6f9c0..b441c5ce4157 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -749,8 +749,17 @@ static inline void nvme_trace_bio_complete(struct requ= est *req, { struct nvme_ns *ns =3D req->q->queuedata; =20 - if ((req->cmd_flags & REQ_NVME_MPATH) && req->bio) + if ((req->cmd_flags & REQ_NVME_MPATH) && req->bio) { trace_block_bio_complete(ns->head->disk->queue, req->bio); + + /* Point bio->bi_disk to head disk. + * This bio maybe as other bio's parent in bio chain. If this bi_disk + * is kfreed by nvme_free_ns, other bio may get this bio by __bio_chain_= endio + * in bio_endio, and access this bi_disk. This will trigger heap-use-aft= er-free + * or null pointer oops. + */ + req->bio->bi_disk =3D ns->head->disk; + } } =20 extern struct device_attribute dev_attr_ana_grpid; --=20 2.39.1