From patchwork Thu Sep 26 08:16:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhangyanjun@cestc.cn X-Patchwork-Id: 13813027 Received: from smtp.cecloud.com (unknown [1.203.97.246]) by smtp.subspace.kernel.org (Postfix) with ESMTP id DB40D135A53; Thu, 26 Sep 2024 08:22:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=1.203.97.246 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727338942; cv=none; b=Hk4lQF/p819F1Cg/8r5b37T96F73GO9itDM9R5cIcDwaCiG0rLQeSTISXs6haqNT2xeqju++L3V5CiM4BAAHQP5RHVWAVzrdA4QGX0tGh5PmWgPGMZk/9kW+7ogTpvQP8mkQRFwRcqJbMrUsHm6YhVJ3GH2DsEUqsRnL3KhjSsQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727338942; c=relaxed/simple; bh=o1HxEOa7ZElU232Wap1VVTtRwgNaKZpdoFF/YeEDG9U=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=tkydIBPQ+tDe8NY5M/8X6DnIgLKWMMc2X46yGcAbvvUlFqs4qdG3+tUgWAPbCNd1u5O2hDeO6uqheBqEh0QdaGmHIDmf2yTQY1pnJ/PnWUjsou3Eppjq7saEk5KlSGUg3dtaBuRxmY9Rk/3w5khoSGvyQmlmf80m/08siR+GUwc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=cestc.cn; spf=pass smtp.mailfrom=cestc.cn; arc=none smtp.client-ip=1.203.97.246 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=cestc.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cestc.cn Received: from localhost (localhost [127.0.0.1]) by smtp.cecloud.com (Postfix) with ESMTP id A8BE37C0112; Thu, 26 Sep 2024 16:16:14 +0800 (CST) X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-SKE-CHECKED: 1 X-ANTISPAM-LEVEL: 2 Received: from localhost.localdomain (unknown [111.48.58.13]) by smtp.cecloud.com (postfix) whith ESMTP id P880592T281472258535792S1727338573831404_; Thu, 26 Sep 2024 16:16:14 +0800 (CST) X-IP-DOMAINF: 1 X-RL-SENDER: zhangyanjun@cestc.cn X-SENDER: zhangyanjun@cestc.cn X-LOGIN-NAME: zhangyanjun@cestc.cn X-FST-TO: trondmy@kernel.org X-RCPT-COUNT: 5 X-LOCAL-RCPT-COUNT: 1 X-MUTI-DOMAIN-COUNT: 0 X-SENDER-IP: 111.48.58.13 X-ATTACHMENT-NUM: 0 X-UNIQUE-TAG: X-System-Flag: 0 From: zhangyanjun@cestc.cn To: trondmy@kernel.org, anna@kernel.org Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, Yanjun Zhang Subject: [PATCH] NFSv4: fix possible NULL-pointer dereference in nfs42_complete_copies after state recovery failed Date: Thu, 26 Sep 2024 16:16:11 +0800 Message-Id: <20240926081611.148894-1-zhangyanjun@cestc.cn> X-Mailer: git-send-email 2.31.1 Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Yanjun Zhang On the node of an nfs client, some files saved in the mountpoint of the nfs server was coping within the same nfs server. Accidentally, the nfs42_complete_copies get a NULL-pointer dereference crash, as can be seen in following syslog: [232064.838881] NFSv4: state recovery failed for open file nfs/pvc-12b5200d-cd0f-46a3-b9f0-af8f4fe0ef64.qcow2, error = -116 [232064.839360] NFSv4: state recovery failed for open file nfs/pvc-12b5200d-cd0f-46a3-b9f0-af8f4fe0ef64.qcow2, error = -116 [232066.588183] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000058 [232066.588586] Mem abort info: [232066.588701] ESR = 0x0000000096000007 [232066.588862] EC = 0x25: DABT (current EL), IL = 32 bits [232066.589084] SET = 0, FnV = 0 [232066.589216] EA = 0, S1PTW = 0 [232066.589340] FSC = 0x07: level 3 translation fault [232066.589559] Data abort info: [232066.589683] ISV = 0, ISS = 0x00000007 [232066.589842] CM = 0, WnR = 0 [232066.589967] user pgtable: 64k pages, 48-bit VAs, pgdp=00002000956ff400 [232066.590231] [0000000000000058] pgd=08001100ae100003, p4d=08001100ae100003, pud=08001100ae100003, pmd=08001100b3c00003, pte=0000000000000000 [232066.590757] Internal error: Oops: 96000007 [#1] SMP [232066.590958] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache netfs ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm vhost_net vhost vhost_iotlb tap tun ipt_rpfilter xt_multiport ip_set_hash_ip ip_set_hash_net xfrm_interface xfrm6_tunnel tunnel4 tunnel6 esp4 ah4 wireguard libcurve25519_generic veth xt_addrtype xt_set nf_conntrack_netlink ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_bitmap_port ip_set_hash_ipport dummy ip_set ip_vs_sh ip_vs_wrr ip_vs_rr ip_vs iptable_filter sch_ingress nfnetlink_cttimeout vport_gre ip_gre ip_tunnel gre vport_geneve geneve vport_vxlan vxlan ip6_udp_tunnel udp_tunnel openvswitch nf_conncount dm_round_robin dm_service_time dm_multipath xt_nat xt_MASQUERADE nft_chain_nat nf_nat xt_mark xt_conntrack xt_comment nft_compat nft_counter nf_tables nfnetlink ocfs2 ocfs2_nodemanager ocfs2_stackglue iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ipmi_ssif nbd overlay 8021q garp mrp bonding tls rfkill sunrpc ext4 mbcache jbd2 [232066.591052] vfat fat cas_cache cas_disk ses enclosure scsi_transport_sas sg acpi_ipmi ipmi_si ipmi_devintf ipmi_msghandler ip_tables vfio_pci vfio_pci_core vfio_virqfd vfio_iommu_type1 vfio dm_mirror dm_region_hash dm_log dm_mod nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 br_netfilter bridge stp llc fuse xfs libcrc32c ast drm_vram_helper qla2xxx drm_kms_helper syscopyarea crct10dif_ce sysfillrect ghash_ce sysimgblt sha2_ce fb_sys_fops cec sha256_arm64 sha1_ce drm_ttm_helper ttm nvme_fc igb sbsa_gwdt nvme_fabrics drm nvme_core i2c_algo_bit i40e scsi_transport_fc megaraid_sas aes_neon_bs [232066.596953] CPU: 6 PID: 4124696 Comm: 10.253.166.125- Kdump: loaded Not tainted 5.15.131-9.cl9_ocfs2.aarch64 #1 [232066.597356] Hardware name: Great Wall .\x93\x8e...RF6260 V5/GWMSSE2GL1T, BIOS T656FBE_V3.0.18 2024-01-06 [232066.597721] pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [232066.598034] pc : nfs4_reclaim_open_state+0x220/0x800 [nfsv4] [232066.598327] lr : nfs4_reclaim_open_state+0x12c/0x800 [nfsv4] [232066.598595] sp : ffff8000f568fc70 [232066.598731] x29: ffff8000f568fc70 x28: 0000000000001000 x27: ffff21003db33000 [232066.599030] x26: ffff800005521ae0 x25: ffff0100f98fa3f0 x24: 0000000000000001 [232066.599319] x23: ffff800009920008 x22: ffff21003db33040 x21: ffff21003db33050 [232066.599628] x20: ffff410172fe9e40 x19: ffff410172fe9e00 x18: 0000000000000000 [232066.599914] x17: 0000000000000000 x16: 0000000000000004 x15: 0000000000000000 [232066.600195] x14: 0000000000000000 x13: ffff800008e685a8 x12: 00000000eac0c6e6 [232066.600498] x11: 0000000000000000 x10: 0000000000000008 x9 : ffff8000054e5828 [232066.600784] x8 : 00000000ffffffbf x7 : 0000000000000001 x6 : 000000000a9eb14a [232066.601062] x5 : 0000000000000000 x4 : ffff70ff8a14a800 x3 : 0000000000000058 [232066.601348] x2 : 0000000000000001 x1 : 54dce46366daa6c6 x0 : 0000000000000000 [232066.601636] Call trace: [232066.601749] nfs4_reclaim_open_state+0x220/0x800 [nfsv4] [232066.601998] nfs4_do_reclaim+0x1b8/0x28c [nfsv4] [232066.602218] nfs4_state_manager+0x928/0x10f0 [nfsv4] [232066.602455] nfs4_run_state_manager+0x78/0x1b0 [nfsv4] [232066.602690] kthread+0x110/0x114 [232066.602830] ret_from_fork+0x10/0x20 [232066.602985] Code: 1400000d f9403f20 f9402e61 91016003 (f9402c00) [232066.603284] SMP: stopping secondary CPUs [232066.606936] Starting crashdump kernel... [232066.607146] Bye! With the vmcore, we know that nfs4_copy_state listed by destination nfs_server->ss_copies was added with the field copies in the handle_async_copy, and we found that waiting copy process with the stack as: PID: 3511963 TASK: ffff710028b47e00 CPU: 0 COMMAND: "cp" #0 [ffff8001116ef740] __switch_to at ffff8000081b92f4 #1 [ffff8001116ef760] __schedule at ffff800008dd0650 #2 [ffff8001116ef7c0] schedule at ffff800008dd0a00 #3 [ffff8001116ef7e0] schedule_timeout at ffff800008dd6aa0 #4 [ffff8001116ef860] __wait_for_common at ffff800008dd166c #5 [ffff8001116ef8e0] wait_for_completion_interruptible at ffff800008dd1898 #6 [ffff8001116ef8f0] handle_async_copy at ffff8000055142f4 [nfsv4] #7 [ffff8001116ef970] _nfs42_proc_copy at ffff8000055147c8 [nfsv4] #8 [ffff8001116efa80] nfs42_proc_copy at ffff800005514cf0 [nfsv4] #9 [ffff8001116efc50] __nfs4_copy_file_range.constprop.0 at ffff8000054ed694 [nfsv4] We found that the NULL-pointer dereference was due to nfs42_complete_copies list the nfs_server->ss_copies by the filed ss_copies of nfs4_copy_state. So the nfs4_copy_state address ffff0100f98fa3f0 is offset by 0x10 and the data accessed through this pointer is also incorrect. Generally, the nfs4_state_owner->so_states list is ordered and open(O_RDWR) or open(O_WRITE) states are reclaimed firstly by nfs4_reclaim_open_state. But when destination state was reclaimed failed with NFS_STATE_RECOVERY_FAILED and copies were not deleted in nfs_server->ss_copies, the source state may be taken into nfs42_complete_copies earlier resulting in this situation. To solve this, we newly add a list_head nfs_server->ds_copies for a server-to-server copy specially. Fixes: b1a0913adbef ("NFS: handle source server reboot") Signed-off-by: Yanjun Zhang --- fs/nfs/nfs42proc.c | 2 +- fs/nfs/nfs4state.c | 2 +- include/linux/nfs_fs_sb.h | 1 + 3 files changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c index 28704f924..5a55a1b20 100644 --- a/fs/nfs/nfs42proc.c +++ b/fs/nfs/nfs42proc.c @@ -218,7 +218,7 @@ static int handle_async_copy(struct nfs42_copy_res *res, if (dst_server != src_server) { spin_lock(&src_server->nfs_client->cl_lock); - list_add_tail(©->src_copies, &src_server->ss_copies); + list_add_tail(©->src_copies, &src_server->ds_copies); spin_unlock(&src_server->nfs_client->cl_lock); } diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index 877f682b4..7b4fbba84 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -1596,7 +1596,7 @@ static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state complete(©->completion); } } - list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) { + list_for_each_entry(copy, &sp->so_server->ds_copies, src_copies) { if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) && !nfs4_stateid_match_other(&state->stateid, ©->parent_src_state->stateid))) diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index 1df86ab98..f07448c85 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -240,6 +240,7 @@ struct nfs_server { struct list_head layouts; struct list_head delegations; struct list_head ss_copies; + struct list_head ds_copies; unsigned long delegation_gen; unsigned long mig_gen;