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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 06:00:52 +07:00
SUNRPC: NULL utsname dereference on NFS umount during namespace cleanup
Fix an Oopsable condition when nsm_mon_unmon is called as part of the namespace cleanup, which now apparently happens after the utsname has been freed. Link: http://lkml.kernel.org/r/20150125220604.090121ae@neptune.home Reported-by: Bruno Prémont <bonbons@linux-vserver.org> Cc: stable@vger.kernel.org # 3.18 Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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@ -65,7 +65,7 @@ static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
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return (struct sockaddr *)&nsm->sm_addr;
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}
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static struct rpc_clnt *nsm_create(struct net *net)
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static struct rpc_clnt *nsm_create(struct net *net, const char *nodename)
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{
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struct sockaddr_in sin = {
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.sin_family = AF_INET,
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@ -77,6 +77,7 @@ static struct rpc_clnt *nsm_create(struct net *net)
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.address = (struct sockaddr *)&sin,
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.addrsize = sizeof(sin),
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.servername = "rpc.statd",
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.nodename = nodename,
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.program = &nsm_program,
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.version = NSM_VERSION,
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.authflavor = RPC_AUTH_NULL,
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@ -102,7 +103,7 @@ static struct rpc_clnt *nsm_client_set(struct lockd_net *ln,
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return clnt;
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}
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static struct rpc_clnt *nsm_client_get(struct net *net)
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static struct rpc_clnt *nsm_client_get(struct net *net, const char *nodename)
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{
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struct rpc_clnt *clnt, *new;
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struct lockd_net *ln = net_generic(net, lockd_net_id);
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@ -111,7 +112,7 @@ static struct rpc_clnt *nsm_client_get(struct net *net)
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if (clnt != NULL)
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goto out;
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clnt = new = nsm_create(net);
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clnt = new = nsm_create(net, nodename);
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if (IS_ERR(clnt))
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goto out;
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@ -190,19 +191,23 @@ int nsm_monitor(const struct nlm_host *host)
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struct nsm_res res;
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int status;
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struct rpc_clnt *clnt;
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const char *nodename = NULL;
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dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
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if (nsm->sm_monitored)
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return 0;
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if (host->h_rpcclnt)
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nodename = host->h_rpcclnt->cl_nodename;
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/*
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* Choose whether to record the caller_name or IP address of
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* this peer in the local rpc.statd's database.
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*/
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nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
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clnt = nsm_client_get(host->net);
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clnt = nsm_client_get(host->net, nodename);
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if (IS_ERR(clnt)) {
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status = PTR_ERR(clnt);
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dprintk("lockd: failed to create NSM upcall transport, "
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@ -57,7 +57,7 @@ struct rpc_clnt {
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const struct rpc_timeout *cl_timeout; /* Timeout strategy */
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int cl_nodelen; /* nodename length */
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char cl_nodename[UNX_MAXNODENAME];
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char cl_nodename[UNX_MAXNODENAME+1];
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struct rpc_pipe_dir_head cl_pipedir_objects;
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struct rpc_clnt * cl_parent; /* Points to parent of clones */
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struct rpc_rtt cl_rtt_default;
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@ -112,6 +112,7 @@ struct rpc_create_args {
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struct sockaddr *saddress;
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const struct rpc_timeout *timeout;
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const char *servername;
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const char *nodename;
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const struct rpc_program *program;
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u32 prognumber; /* overrides program->number */
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u32 version;
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@ -286,10 +286,8 @@ static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt,
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static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename)
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{
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clnt->cl_nodelen = strlen(nodename);
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if (clnt->cl_nodelen > UNX_MAXNODENAME)
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clnt->cl_nodelen = UNX_MAXNODENAME;
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memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen);
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clnt->cl_nodelen = strlcpy(clnt->cl_nodename,
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nodename, sizeof(clnt->cl_nodename));
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}
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static int rpc_client_register(struct rpc_clnt *clnt,
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@ -365,6 +363,7 @@ static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
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const struct rpc_version *version;
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struct rpc_clnt *clnt = NULL;
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const struct rpc_timeout *timeout;
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const char *nodename = args->nodename;
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int err;
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/* sanity check the name before trying to print it */
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@ -420,8 +419,10 @@ static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args,
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atomic_set(&clnt->cl_count, 1);
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if (nodename == NULL)
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nodename = utsname()->nodename;
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/* save the nodename */
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rpc_clnt_set_nodename(clnt, utsname()->nodename);
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rpc_clnt_set_nodename(clnt, nodename);
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err = rpc_client_register(clnt, args->authflavor, args->client_name);
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if (err)
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@ -576,6 +577,7 @@ static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
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if (xprt == NULL)
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goto out_err;
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args->servername = xprt->servername;
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args->nodename = clnt->cl_nodename;
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new = rpc_new_client(args, xprt, clnt);
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if (IS_ERR(new)) {
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@ -355,7 +355,8 @@ int rpcb_create_local(struct net *net)
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return result;
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}
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static struct rpc_clnt *rpcb_create(struct net *net, const char *hostname,
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static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
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const char *hostname,
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struct sockaddr *srvaddr, size_t salen,
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int proto, u32 version)
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{
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@ -365,6 +366,7 @@ static struct rpc_clnt *rpcb_create(struct net *net, const char *hostname,
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.address = srvaddr,
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.addrsize = salen,
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.servername = hostname,
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.nodename = nodename,
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.program = &rpcb_program,
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.version = version,
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.authflavor = RPC_AUTH_UNIX,
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@ -740,7 +742,9 @@ void rpcb_getport_async(struct rpc_task *task)
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dprintk("RPC: %5u %s: trying rpcbind version %u\n",
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task->tk_pid, __func__, bind_version);
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rpcb_clnt = rpcb_create(xprt->xprt_net, xprt->servername, sap, salen,
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rpcb_clnt = rpcb_create(xprt->xprt_net,
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clnt->cl_nodename,
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xprt->servername, sap, salen,
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xprt->prot, bind_version);
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if (IS_ERR(rpcb_clnt)) {
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status = PTR_ERR(rpcb_clnt);
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