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![Peng Tao](/assets/img/avatar_default.png)
lockd assumes hostname exists otherwise kernel oops. It can be reproduced by following steps: 1. mount flexfile MDS 2. write some files 3. mount DS via nfsv3 BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff8134f332>] strlen+0x2/0x20 PGD 0 Oops: 0000 [#1] SMP Modules linked in: nfsd(F) nfs_layout_flexfiles(F) rpcsec_gss_krb5(F) auth_rpcgss(F) nfsv4(F) dns_resolver(F) nfsv3(F) nfs_acl(F) nfs(F) lockd(F) sunrpc(F) fscache(F) ebtable_nat(F) nf_conntrack_netbios_ns(F) nf_conntrack_broadcast(F) ipt_MASQUERADE(F) ip6table_nat(F) nf_nat_ipv6(F) ip6table_mangle(F) ip6t_REJECT(F) nf_conntrack_ipv6(F) nf_defrag_ipv6(F) iptable_nat(F) nf_nat_ipv4(F) nf_nat(F) iptable_mangle(F) nf_conntrack_ipv4(F) nf_defrag_ipv4(F) xt_conntrack(F) nf_conntrack(F) ebtable_filter(F) ebtables(F) ip6table_filter(F) ip6_tables(F) bnep(F) snd_ens1371(F) snd_rawmidi(F) snd_ac97_codec(F) btusb(F) ac97_bus(F) snd_seq(F) snd_seq_device(F) snd_pcm(F) ppdev(F) bluetooth(F) 6lowpan_iphc(F) rfkill(F) vmw_balloon(F) snd_timer(F) snd(F) soundcore(F) gameport(F) i2c_piix4(F) e1000(F) vmw_vmci(F) parport_pc(F) parport(F) shpchp(F) uinput(F) xfs(F) libcrc32c(F) vmwgfx(F) ttm(F) drm(F) mptspi(F) scsi_transport_spi(F) mptscsih(F) mptbase(F) i2c_core(F) CPU: 0 PID: 10397 Comm: mount.nfs Tainted: GF 3.14.7-100.pd_client.001.fc16.x86_64 #1 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013 task: ffff880008942600 ti: ffff880007990000 task.ti: ffff880007990000 RIP: 0010:[<ffffffff8134f332>] [<ffffffff8134f332>] strlen+0x2/0x20 RSP: 0018:ffff880007991aa0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff880038d39c20 RCX: 0000000000000004 RDX: 0000000000000006 RSI: 0000000000000010 RDI: 0000000000000000 RBP: ffff880007991b38 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000014600 R11: 0000000000000400 R12: ffffffff81cc8580 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000004 FS: 00007f90cd2ef880(0000) GS:ffff88003f600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000001710000 CR4: 00000000001407f0 Stack: ffffffffa045f52c ffff880001782230 ffff880004141e28 0006880007991ac8 ffffffff816dc14b ffff880000000000 ffff880038d39c20 0000000000000010 0000000481cc0006 0000000000000000 ffffffffa0410be8 000000000000c014 Call Trace: [<ffffffffa045f52c>] ? nlmclnt_lookup_host+0x4c/0x2c0 [lockd] [<ffffffff816dc14b>] ? _raw_spin_unlock_bh+0x1b/0x20 [<ffffffffa0410be8>] ? svc_destroy+0xb8/0x140 [sunrpc] [<ffffffffa045c323>] nlmclnt_init+0x53/0xc0 [lockd] [<ffffffffa047d2dc>] ? nfs_get_client+0x1cc/0x340 [nfs] [<ffffffffa047c2e7>] nfs_start_lockd+0xa7/0xd0 [nfs] [<ffffffffa047df71>] nfs_create_server+0x181/0x5c0 [nfs] [<ffffffffa04460f3>] nfs3_create_server+0x13/0x30 [nfsv3] [<ffffffffa048a0bc>] nfs_try_mount+0x21c/0x300 [nfs] [<ffffffff811ca32d>] ? __kmalloc_track_caller+0x1ad/0x240 [<ffffffffa048b677>] ? nfs_fs_mount+0xc37/0xd80 [nfs] [<ffffffffa048ad05>] nfs_fs_mount+0x2c5/0xd80 [nfs] [<ffffffffa048a830>] ? nfs_clone_super+0x140/0x140 [nfs] [<ffffffffa048a240>] ? nfs_clone_sb_security+0x40/0x40 [nfs] [<ffffffff811e7e43>] mount_fs+0x43/0x1b0 [<ffffffff81193100>] ? __alloc_percpu+0x10/0x20 [<ffffffff812026e6>] vfs_kern_mount+0x76/0x120 [<ffffffff81204917>] do_mount+0x237/0xa80 Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/sunrpc/addr.h>
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#include "internal.h"
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#include "nfs3_fs.h"
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#ifdef CONFIG_NFS_V3_ACL
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static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
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static const struct rpc_version *nfsacl_version[] = {
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[3] = &nfsacl_version3,
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};
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const struct rpc_program nfsacl_program = {
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.name = "nfsacl",
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.number = NFS_ACL_PROGRAM,
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.nrvers = ARRAY_SIZE(nfsacl_version),
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.version = nfsacl_version,
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.stats = &nfsacl_rpcstat,
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};
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/*
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* Initialise an NFSv3 ACL client connection
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*/
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static void nfs_init_server_aclclient(struct nfs_server *server)
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{
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if (server->flags & NFS_MOUNT_NOACL)
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goto out_noacl;
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server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
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if (IS_ERR(server->client_acl))
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goto out_noacl;
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/* No errors! Assume that Sun nfsacls are supported */
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server->caps |= NFS_CAP_ACLS;
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return;
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out_noacl:
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server->caps &= ~NFS_CAP_ACLS;
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}
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#else
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static inline void nfs_init_server_aclclient(struct nfs_server *server)
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{
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server->flags &= ~NFS_MOUNT_NOACL;
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server->caps &= ~NFS_CAP_ACLS;
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}
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#endif
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struct nfs_server *nfs3_create_server(struct nfs_mount_info *mount_info,
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struct nfs_subversion *nfs_mod)
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{
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struct nfs_server *server = nfs_create_server(mount_info, nfs_mod);
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/* Create a client RPC handle for the NFS v3 ACL management interface */
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if (!IS_ERR(server))
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nfs_init_server_aclclient(server);
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return server;
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}
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struct nfs_server *nfs3_clone_server(struct nfs_server *source,
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struct nfs_fh *fh,
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struct nfs_fattr *fattr,
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rpc_authflavor_t flavor)
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{
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struct nfs_server *server = nfs_clone_server(source, fh, fattr, flavor);
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if (!IS_ERR(server) && !IS_ERR(source->client_acl))
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nfs_init_server_aclclient(server);
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return server;
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}
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/*
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* Set up a pNFS Data Server client over NFSv3.
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*
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* Return any existing nfs_client that matches server address,port,version
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* and minorversion.
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*
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* For a new nfs_client, use a soft mount (default), a low retrans and a
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* low timeout interval so that if a connection is lost, we retry through
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* the MDS.
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*/
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struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp,
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const struct sockaddr *ds_addr, int ds_addrlen,
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int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
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rpc_authflavor_t au_flavor)
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{
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struct nfs_client_initdata cl_init = {
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.addr = ds_addr,
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.addrlen = ds_addrlen,
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.nfs_mod = &nfs_v3,
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.proto = ds_proto,
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.net = mds_clp->cl_net,
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};
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struct rpc_timeout ds_timeout;
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struct nfs_client *clp;
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char buf[INET6_ADDRSTRLEN + 1];
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/* fake a hostname because lockd wants it */
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if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
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return ERR_PTR(-EINVAL);
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cl_init.hostname = buf;
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/* Use the MDS nfs_client cl_ipaddr. */
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nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
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clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
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au_flavor);
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return clp;
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}
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EXPORT_SYMBOL_GPL(nfs3_set_ds_client);
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