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NFSD: grab nfsd_mutex in nfsd_nl_rpc_status_get_dumpit()

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Grab nfsd_mutex lock in nfsd_nl_rpc_status_get_dumpit routine and remove
nfsd_nl_rpc_status_get_start() and nfsd_nl_rpc_status_get_done(). This
patch fix the syzbot log reported below:

INFO: task syz-executor.1:17770 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc3-syzkaller-00022-gcea2a26553ac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:23800 pid:17770 tgid:17767 ppid:11381  flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 nfsd_nl_listener_get_doit+0x115/0x5d0 fs/nfsd/nfsctl.c:2124
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0xb16/0xec0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2564
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8db/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x223/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2585
 ___sys_sendmsg net/socket.c:2639 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2668
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24ed27cea9
RSP: 002b:00007f24ee0080c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f24ed3b3f80 RCX: 00007f24ed27cea9
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000005
RBP: 00007f24ed2ebff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

Fixes: 1bd773b4f0 ("nfsd: hold nfsd_mutex across entire netlink operation")
Fixes: bd9d6a3efa ("NFSD: add rpc_status netlink support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Lorenzo Bianconi 2024-06-17 16:26:26 +02:00 committed by Chuck Lever
parent 8e948c365d
commit da2c8fef13
4 changed files with 11 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/netlink/specs/nfsd.yaml
View File

@ -123,8 +123,6 @@ operations:
doc: dump pending nfsd rpc
attribute-set: rpc-status
dump:
pre: nfsd-nl-rpc-status-get-start
post: nfsd-nl-rpc-status-get-done
reply:
attributes:
- xid

2
fs/nfsd/netlink.c
View File

@ -44,9 +44,7 @@ static const struct nla_policy nfsd_listener_set_nl_policy[NFSD_A_SERVER_SOCK_AD
static const struct genl_split_ops nfsd_nl_ops[] = {
{
.cmd = NFSD_CMD_RPC_STATUS_GET,
.start = nfsd_nl_rpc_status_get_start,
.dumpit = nfsd_nl_rpc_status_get_dumpit,
.done = nfsd_nl_rpc_status_get_done,
.flags = GENL_CMD_CAP_DUMP,
},
{

3
fs/nfsd/netlink.h
View File

@ -15,9 +15,6 @@
extern const struct nla_policy nfsd_sock_nl_policy[NFSD_A_SOCK_TRANSPORT_NAME + 1];
extern const struct nla_policy nfsd_version_nl_policy[NFSD_A_VERSION_ENABLED + 1];
int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb);
int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb);
int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info);

48
fs/nfsd/nfsctl.c
View File

@ -1460,28 +1460,6 @@ static int create_proc_exports_entry(void)
unsigned int nfsd_net_id;
/**
* nfsd_nl_rpc_status_get_start - Prepare rpc_status_get dumpit
* @cb: netlink metadata and command arguments
*
* Return values:
* %0: The rpc_status_get command may proceed
* %-ENODEV: There is no NFSD running in this namespace
*/
int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb)
{
struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id);
int ret = -ENODEV;
mutex_lock(&nfsd_mutex);
if (nn->nfsd_serv)
ret = 0;
else
mutex_unlock(&nfsd_mutex);
return ret;
}
static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
struct netlink_callback *cb,
struct nfsd_genl_rqstp *rqstp)
@ -1558,8 +1536,16 @@ static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id);
int i, ret, rqstp_index = 0;
struct nfsd_net *nn;
mutex_lock(&nfsd_mutex);
nn = net_generic(sock_net(skb->sk), nfsd_net_id);
if (!nn->nfsd_serv) {
ret = -ENODEV;
goto out_unlock;
}
rcu_read_lock();
@ -1636,22 +1622,10 @@ int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
ret = skb->len;
out:
rcu_read_unlock();
return ret;
}
/**
* nfsd_nl_rpc_status_get_done - rpc_status_get dumpit post-processing
* @cb: netlink metadata and command arguments
*
* Return values:
* %0: Success
*/
int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb)
{
out_unlock:
mutex_unlock(&nfsd_mutex);
return 0;
return ret;
}
/**