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NFS client bugfixes for Linux 5.7 

Highlights include:
 
 Stable fixes
 - fix handling of backchannel binding in BIND_CONN_TO_SESSION
 
 Bugfixes
 - Fix a credential use-after-free issue in pnfs_roc()
 - Fix potential posix_acl refcnt leak in nfs3_set_acl
 - defer slow parts of rpc_free_client() to a workqueue
 - Fix an Oopsable race in __nfs_list_for_each_server()
 - Fix trace point use-after-free race
 - Regression: the RDMA client no longer responds to server disconnect requests
 - Fix return values of xdr_stream_encode_item_{present, absent}
 - _pnfs_return_layout() must always wait for layoutreturn completion
 
 Cleanups
 - Remove unreachable error conditions
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Merge tag 'nfs-for-5.7-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

  Stable fixes:
   - fix handling of backchannel binding in BIND_CONN_TO_SESSION

  Bugfixes:
   - Fix a credential use-after-free issue in pnfs_roc()
   - Fix potential posix_acl refcnt leak in nfs3_set_acl
   - defer slow parts of rpc_free_client() to a workqueue
   - Fix an Oopsable race in __nfs_list_for_each_server()
   - Fix trace point use-after-free race
   - Regression: the RDMA client no longer responds to server disconnect
     requests
   - Fix return values of xdr_stream_encode_item_{present, absent}
   - _pnfs_return_layout() must always wait for layoutreturn completion

  Cleanups:
   - Remove unreachable error conditions"

* tag 'nfs-for-5.7-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: Fix a race in __nfs_list_for_each_server()
  NFSv4.1: fix handling of backchannel binding in BIND_CONN_TO_SESSION
  SUNRPC: defer slow parts of rpc_free_client() to a workqueue.
  NFSv4: Remove unreachable error condition due to rpc_run_task()
  SUNRPC: Remove unreachable error condition
  xprtrdma: Fix use of xdr_stream_encode_item_{present, absent}
  xprtrdma: Fix trace point use-after-free race
  xprtrdma: Restore wake-up-all to rpcrdma_cm_event_handler()
  nfs: Fix potential posix_acl refcnt leak in nfs3_set_acl
  NFS/pnfs: Fix a credential use-after-free issue in pnfs_roc()
  NFS/pnfs: Ensure that _pnfs_return_layout() waits for layoutreturn completion
This commit is contained in:
Linus Torvalds 2020-05-02 11:24:01 -07:00
parent ed6889db63 9c07b75b80
commit 29a47f456d
10 changed files with 79 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
fs/nfs/nfs3acl.c
View File

@ -253,37 +253,45 @@ int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
struct posix_acl *alloc = NULL, *dfacl = NULL;
struct posix_acl *orig = acl, *dfacl = NULL, *alloc;
int status;
if (S_ISDIR(inode->i_mode)) {
switch(type) {
case ACL_TYPE_ACCESS:
alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT);
alloc = get_acl(inode, ACL_TYPE_DEFAULT);
if (IS_ERR(alloc))
goto fail;
dfacl = alloc;
break;
case ACL_TYPE_DEFAULT:
dfacl = acl;
alloc = acl = get_acl(inode, ACL_TYPE_ACCESS);
alloc = get_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR(alloc))
goto fail;
dfacl = acl;
acl = alloc;
break;
}
}
if (acl == NULL) {
alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
if (IS_ERR(alloc))
goto fail;
acl = alloc;
}
status = __nfs3_proc_setacls(inode, acl, dfacl);
posix_acl_release(alloc);
out:
if (acl != orig)
posix_acl_release(acl);
if (dfacl != orig)
posix_acl_release(dfacl);
return status;
fail:
return PTR_ERR(alloc);
status = PTR_ERR(alloc);
goto out;
}
const struct xattr_handler *nfs3_xattr_handlers[] = {

11
fs/nfs/nfs4proc.c
View File

@ -7891,6 +7891,7 @@ static void
nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
{
struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
struct nfs_client *clp = args->client;
switch (task->tk_status) {
@ -7899,6 +7900,12 @@ nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
nfs4_schedule_session_recovery(clp->cl_session,
task->tk_status);
}
if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
res->dir != NFS4_CDFS4_BOTH) {
rpc_task_close_connection(task);
if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
rpc_restart_call(task);
}
}
static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
@ -7921,6 +7928,7 @@ int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
struct nfs41_bind_conn_to_session_args args = {
.client = clp,
.dir = NFS4_CDFC4_FORE_OR_BOTH,
.retries = 0,
};
struct nfs41_bind_conn_to_session_res res;
struct rpc_message msg = {
@ -9191,8 +9199,7 @@ nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return ERR_CAST(task);
status = rpc_wait_for_completion_task(task);
if (status != 0)
goto out;

11
fs/nfs/pnfs.c
View File

@ -1332,13 +1332,15 @@ _pnfs_return_layout(struct inode *ino)
!valid_layout) {
spin_unlock(&ino->i_lock);
dprintk("NFS: %s no layout segments to return\n", __func__);
goto out_put_layout_hdr;
goto out_wait_layoutreturn;
}
send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
spin_unlock(&ino->i_lock);
if (send)
status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true);
out_wait_layoutreturn:
wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
out_put_layout_hdr:
pnfs_free_lseg_list(&tmp_list);
pnfs_put_layout_hdr(lo);
@ -1456,18 +1458,15 @@ retry:
/* lo ref dropped in pnfs_roc_release() */
layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode);
/* If the creds don't match, we can't compound the layoutreturn */
if (!layoutreturn)
if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0)
goto out_noroc;
if (cred_fscmp(cred, lc_cred) != 0)
goto out_noroc_put_cred;
roc = layoutreturn;
pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
res->lrs_present = 0;
layoutreturn = false;
out_noroc_put_cred:
put_cred(lc_cred);
out_noroc:
spin_unlock(&ino->i_lock);
rcu_read_unlock();

2
fs/nfs/super.c
View File

@ -185,7 +185,7 @@ static int __nfs_list_for_each_server(struct list_head *head,
rcu_read_lock();
list_for_each_entry_rcu(server, head, client_link) {
if (!nfs_sb_active(server->super))
if (!(server->super && nfs_sb_active(server->super)))
continue;
rcu_read_unlock();
if (last)

2
include/linux/nfs_xdr.h
View File

@ -1317,11 +1317,13 @@ struct nfs41_impl_id {
struct nfstime4 date;
};
#define MAX_BIND_CONN_TO_SESSION_RETRIES 3
struct nfs41_bind_conn_to_session_args {
struct nfs_client *client;
struct nfs4_sessionid sessionid;
u32 dir;
bool use_conn_in_rdma_mode;
int retries;
};
struct nfs41_bind_conn_to_session_res {

13
include/linux/sunrpc/clnt.h
View File

@ -71,7 +71,13 @@ struct rpc_clnt {
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
struct dentry *cl_debugfs; /* debugfs directory */
#endif
struct rpc_xprt_iter cl_xpi;
/* cl_work is only needed after cl_xpi is no longer used,
* and that are of similar size
*/
union {
struct rpc_xprt_iter cl_xpi;
struct work_struct cl_work;
};
const struct cred *cl_cred;
};
@ -236,4 +242,9 @@ static inline int rpc_reply_expected(struct rpc_task *task)
(task->tk_msg.rpc_proc->p_decode != NULL);
}
static inline void rpc_task_close_connection(struct rpc_task *task)
{
if (task->tk_xprt)
xprt_force_disconnect(task->tk_xprt);
}
#endif /* _LINUX_SUNRPC_CLNT_H */

12
include/trace/events/rpcrdma.h
View File

@ -692,11 +692,10 @@ TRACE_EVENT(xprtrdma_prepsend_failed,
TRACE_EVENT(xprtrdma_post_send,
TP_PROTO(
const struct rpcrdma_req *req,
int status
const struct rpcrdma_req *req
),
TP_ARGS(req, status),
TP_ARGS(req),
TP_STRUCT__entry(
__field(const void *, req)
@ -705,7 +704,6 @@ TRACE_EVENT(xprtrdma_post_send,
__field(unsigned int, client_id)
__field(int, num_sge)
__field(int, signaled)
__field(int, status)
),
TP_fast_assign(
@ -718,15 +716,13 @@ TRACE_EVENT(xprtrdma_post_send,
__entry->sc = req->rl_sendctx;
__entry->num_sge = req->rl_wr.num_sge;
__entry->signaled = req->rl_wr.send_flags & IB_SEND_SIGNALED;
__entry->status = status;
),
TP_printk("task:%u@%u req=%p sc=%p (%d SGE%s) %sstatus=%d",
TP_printk("task:%u@%u req=%p sc=%p (%d SGE%s) %s",
__entry->task_id, __entry->client_id,
__entry->req, __entry->sc, __entry->num_sge,
(__entry->num_sge == 1 ? "" : "s"),
(__entry->signaled ? "signaled " : ""),
__entry->status
(__entry->signaled ? "signaled" : "")
)
);

24
net/sunrpc/clnt.c
View File

@ -880,6 +880,20 @@ EXPORT_SYMBOL_GPL(rpc_shutdown_client);
/*
* Free an RPC client
*/
static void rpc_free_client_work(struct work_struct *work)
{
struct rpc_clnt *clnt = container_of(work, struct rpc_clnt, cl_work);
/* These might block on processes that might allocate memory,
* so they cannot be called in rpciod, so they are handled separately
* here.
*/
rpc_clnt_debugfs_unregister(clnt);
rpc_clnt_remove_pipedir(clnt);
kfree(clnt);
rpciod_down();
}
static struct rpc_clnt *
rpc_free_client(struct rpc_clnt *clnt)
{
@ -890,17 +904,16 @@ rpc_free_client(struct rpc_clnt *clnt)
rcu_dereference(clnt->cl_xprt)->servername);
if (clnt->cl_parent != clnt)
parent = clnt->cl_parent;
rpc_clnt_debugfs_unregister(clnt);
rpc_clnt_remove_pipedir(clnt);
rpc_unregister_client(clnt);
rpc_free_iostats(clnt->cl_metrics);
clnt->cl_metrics = NULL;
xprt_put(rcu_dereference_raw(clnt->cl_xprt));
xprt_iter_destroy(&clnt->cl_xpi);
rpciod_down();
put_cred(clnt->cl_cred);
rpc_free_clid(clnt);
kfree(clnt);
INIT_WORK(&clnt->cl_work, rpc_free_client_work);
schedule_work(&clnt->cl_work);
return parent;
}
@ -2808,8 +2821,7 @@ int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
task = rpc_call_null_helper(clnt, xprt, NULL,
RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC|RPC_TASK_NULLCREDS,
&rpc_cb_add_xprt_call_ops, data);
if (IS_ERR(task))
return PTR_ERR(task);
rpc_put_task(task);
success:
return 1;

15
net/sunrpc/xprtrdma/rpc_rdma.c
View File

@ -388,7 +388,9 @@ static int rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt,
} while (nsegs);
done:
return xdr_stream_encode_item_absent(xdr);
if (xdr_stream_encode_item_absent(xdr) < 0)
return -EMSGSIZE;
return 0;
}
/* Register and XDR encode the Write list. Supports encoding a list
@ -454,7 +456,9 @@ static int rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt,
*segcount = cpu_to_be32(nchunks);
done:
return xdr_stream_encode_item_absent(xdr);
if (xdr_stream_encode_item_absent(xdr) < 0)
return -EMSGSIZE;
return 0;
}
/* Register and XDR encode the Reply chunk. Supports encoding an array
@ -480,8 +484,11 @@ static int rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt,
int nsegs, nchunks;
__be32 *segcount;
if (wtype != rpcrdma_replych)
return xdr_stream_encode_item_absent(xdr);
if (wtype != rpcrdma_replych) {
if (xdr_stream_encode_item_absent(xdr) < 0)
return -EMSGSIZE;
return 0;
}
seg = req->rl_segments;
nsegs = rpcrdma_convert_iovs(r_xprt, &rqst->rq_rcv_buf, 0, wtype, seg);

3
net/sunrpc/xprtrdma/verbs.c
View File

@ -289,6 +289,7 @@ rpcrdma_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
case RDMA_CM_EVENT_DISCONNECTED:
ep->re_connect_status = -ECONNABORTED;
disconnected:
xprt_force_disconnect(xprt);
return rpcrdma_ep_destroy(ep);
default:
break;
@ -1355,8 +1356,8 @@ int rpcrdma_post_sends(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
--ep->re_send_count;
}
trace_xprtrdma_post_send(req);
rc = frwr_send(r_xprt, req);
trace_xprtrdma_post_send(req, rc);
if (rc)
return -ENOTCONN;
return 0;