From: Wen Gu <guwen@linux.alibaba.com> mainline inclusion from mainline-v5.17-rc1 commit 61f434b0280ed65495831f1b6e1a5c21a90f47c6 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IC914B Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- We encountered some crashes caused by the race between the access and the termination of link groups. Here are some of panic stacks we met: 1) Race between smc_clc_wait_msg() and __smc_lgr_terminate() BUG: kernel NULL pointer dereference, address: 00000000000002f0 Workqueue: smc_hs_wq smc_listen_work [smc] RIP: 0010:smc_clc_wait_msg+0x3eb/0x5c0 [smc] Call Trace: <TASK> ? smc_clc_send_accept+0x45/0xa0 [smc] ? smc_clc_send_accept+0x45/0xa0 [smc] smc_listen_work+0x783/0x1220 [smc] ? finish_task_switch+0xc4/0x2e0 ? process_one_work+0x1ad/0x3c0 process_one_work+0x1ad/0x3c0 worker_thread+0x4c/0x390 ? rescuer_thread+0x320/0x320 kthread+0x149/0x190 ? set_kthread_struct+0x40/0x40 ret_from_fork+0x1f/0x30 </TASK> smc_listen_work() abnormal case like port error --------------------------------------------------------------- | __smc_lgr_terminate() | |- smc_conn_kill() | |- smc_lgr_unregister_conn() | |- set conn->lgr = NULL smc_clc_wait_msg() | |- access conn->lgr (panic) | 2) Race between smc_setsockopt() and __smc_lgr_terminate() BUG: kernel NULL pointer dereference, address: 00000000000002e8 RIP: 0010:smc_setsockopt+0x17a/0x280 [smc] Call Trace: <TASK> __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae </TASK> smc_setsockopt() abnormal case like port error -------------------------------------------------------------- | __smc_lgr_terminate() | |- smc_conn_kill() | |- smc_lgr_unregister_conn() | |- set conn->lgr = NULL mod_delayed_work() | |- access conn->lgr (panic) | There are some other panic places and they are caused by the similar reason as described above, which is accessing link group after termination, thus getting a NULL pointer or invalid resource. Currently, there seems to be no synchronization between the link group access and a sudden termination of it. This patch tries to fix this by introducing reference count of link group and not freeing link group until reference count is zero. Link group might be referred to by links or smc connections. So the operation to the link group reference count can be concluded as follows: object [hold or initialized as 1] [put] ------------------------------------------------------------------- link group smc_lgr_create() smc_lgr_free() connections smc_conn_create() smc_conn_free() links smcr_link_init() smcr_link_clear() Througth this way, we extend the life cycle of link group and ensure it is longer than the life cycle of connections and links above it, so that avoid invalid access to link group after its termination. Signed-off-by: Wen Gu <guwen@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net> Conflicts: net/smc/smc_core.c [conflicts due to merged mainline 7e9b18798039 ("net/smc: replace mutex rmbs_lock and sndbufs_lock with rw_semaphore")] Signed-off-by: Wang Liang <wangliang74@huawei.com> --- net/smc/smc.h | 1 + net/smc/smc_core.c | 60 +++++++++++++++++++++++++++++++++++++--------- net/smc/smc_core.h | 3 +++ 3 files changed, 53 insertions(+), 11 deletions(-) diff --git a/net/smc/smc.h b/net/smc/smc.h index c6d2663ef383..fb94ab6636d1 100644 --- a/net/smc/smc.h +++ b/net/smc/smc.h @@ -229,6 +229,7 @@ struct smc_connection { */ u64 peer_token; /* SMC-D token of peer */ u8 killed : 1; /* abnormal termination */ + u8 freed : 1; /* normal termiation */ u8 out_of_sync : 1; /* out of sync with peer */ }; diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index 9b198ed37dac..211977d724d3 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -218,7 +218,6 @@ static void smc_lgr_unregister_conn(struct smc_connection *conn) __smc_lgr_unregister_conn(conn); } write_unlock_bh(&lgr->conns_lock); - conn->lgr = NULL; } int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb) @@ -749,6 +748,7 @@ int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu; lnk->link_id = smcr_next_link_id(lgr); lnk->lgr = lgr; + smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */ lnk->link_idx = link_idx; lnk->wr_rx_id_compl = 0; smc_ibdev_cnt_inc(lnk); @@ -804,6 +804,7 @@ int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, lnk->state = SMC_LNK_UNUSED; if (!atomic_dec_return(&smcibdev->lnk_cnt)) wake_up(&smcibdev->lnks_deleted); + smc_lgr_put(lgr); /* lgr_hold above */ return rc; } @@ -842,6 +843,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) lgr->terminating = 0; lgr->freeing = 0; lgr->vlan_id = ini->vlan_id; + refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */ init_rwsem(&lgr->sndbufs_lock); init_rwsem(&lgr->rmbs_lock); rwlock_init(&lgr->conns_lock); @@ -1139,8 +1141,19 @@ void smc_conn_free(struct smc_connection *conn) { struct smc_link_group *lgr = conn->lgr; - if (!lgr) + if (!lgr || conn->freed) + /* Connection has never been registered in a + * link group, or has already been freed. + */ return; + + conn->freed = 1; + if (!conn->alert_token_local) + /* Connection has already unregistered from + * link group. + */ + goto lgr_put; + if (lgr->is_smcd) { if (!list_empty(&lgr->list)) smc_ism_unset_conn(conn); @@ -1157,6 +1170,8 @@ void smc_conn_free(struct smc_connection *conn) if (!lgr->conns_num) smc_lgr_schedule_free_work(lgr); +lgr_put: + smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */ } /* unregister a link from a buf_desc */ @@ -1216,9 +1231,10 @@ static void smcr_rtoken_clear_link(struct smc_link *lnk) /* must be called under lgr->llc_conf_mutex lock */ void smcr_link_clear(struct smc_link *lnk, bool log) { + struct smc_link_group *lgr = lnk->lgr; struct smc_ib_device *smcibdev; - if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED) + if (!lgr || lnk->state == SMC_LNK_UNUSED) return; lnk->peer_qpn = 0; smc_llc_link_clear(lnk, log); @@ -1236,6 +1252,7 @@ void smcr_link_clear(struct smc_link *lnk, bool log) lnk->state = SMC_LNK_UNUSED; if (!atomic_dec_return(&smcibdev->lnk_cnt)) wake_up(&smcibdev->lnks_deleted); + smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */ } static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, @@ -1302,6 +1319,21 @@ static void smc_lgr_free_bufs(struct smc_link_group *lgr) __smc_lgr_free_bufs(lgr, true); } +/* won't be freed until no one accesses to lgr anymore */ +static void __smc_lgr_free(struct smc_link_group *lgr) +{ + smc_lgr_free_bufs(lgr); + if (lgr->is_smcd) { + if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) + wake_up(&lgr->smcd->lgrs_deleted); + } else { + smc_wr_free_lgr_mem(lgr); + if (!atomic_dec_return(&lgr_cnt)) + wake_up(&lgrs_deleted); + } + kfree(lgr); +} + /* remove a link group */ static void smc_lgr_free(struct smc_link_group *lgr) { @@ -1317,19 +1349,23 @@ static void smc_lgr_free(struct smc_link_group *lgr) smc_llc_lgr_clear(lgr); } - smc_lgr_free_bufs(lgr); destroy_workqueue(lgr->tx_wq); if (lgr->is_smcd) { smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); put_device(&lgr->smcd->dev); - if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) - wake_up(&lgr->smcd->lgrs_deleted); - } else { - smc_wr_free_lgr_mem(lgr); - if (!atomic_dec_return(&lgr_cnt)) - wake_up(&lgrs_deleted); } - kfree(lgr); + smc_lgr_put(lgr); /* theoretically last lgr_put */ +} + +void smc_lgr_hold(struct smc_link_group *lgr) +{ + refcount_inc(&lgr->refcnt); +} + +void smc_lgr_put(struct smc_link_group *lgr) +{ + if (refcount_dec_and_test(&lgr->refcnt)) + __smc_lgr_free(lgr); } static void smc_sk_wake_ups(struct smc_sock *smc) @@ -1856,6 +1892,8 @@ int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) goto out; } } + smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */ + conn->freed = 0; conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; conn->urg_state = SMC_URG_READ; diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h index 41bd8b78f662..c106dbb491e9 100644 --- a/net/smc/smc_core.h +++ b/net/smc/smc_core.h @@ -263,6 +263,7 @@ struct smc_link_group { u8 terminating : 1;/* lgr is terminating */ u8 freeing : 1; /* lgr is being freed */ + refcount_t refcnt; /* lgr reference count */ bool is_smcd; /* SMC-R or SMC-D */ u8 smc_version; u8 negotiated_eid[SMC_MAX_EID_LEN]; @@ -502,6 +503,8 @@ struct smc_clc_msg_accept_confirm; void smc_lgr_cleanup_early(struct smc_link_group *lgr); void smc_lgr_terminate_sched(struct smc_link_group *lgr); +void smc_lgr_hold(struct smc_link_group *lgr); +void smc_lgr_put(struct smc_link_group *lgr); void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport); void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport); void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, -- 2.34.1