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Thu, 15 Oct 2026 08:13:50 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav07.fra02v.mail.ibm.com (Postfix) with SMTP; Thu, 15 Oct 2026 08:13:50 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 56341) id 9E7EF1612F4; Thu, 15 Oct 2026 10:13:50 +0200 (CEST) From: Mahanta Jambigi To: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, alibuda@linux.alibaba.com, dust.li@linux.alibaba.com, sidraya@linux.ibm.com Cc: hidayath@linux.ibm.com, pasic@linux.ibm.com, horms@kernel.org, tonylu@linux.alibaba.com, guwen@linux.alibaba.com, stable@vger.kernel.org, netdev@vger.kernel.org, linux-s390@vger.kernel.org, linux-rdma@vger.kernel.org, Mahanta Jambigi Subject: [PATCH net v11] net/smc: fix lgr/lnk lifetime vs diag reader race Date: Thu, 15 Oct 2026 10:13:49 +0200 Message-ID: <20261015081349.1252391-1-mjambigi@linux.ibm.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: DyiIgZcW-0xEPRiJwcP3rcHMNdw0UuVh X-Proofpoint-ORIG-GUID: Qt_kG297UElrgHURDlb_wttVFVSER7aH X-Authority-Analysis: v=2.4 cv=aqInmiZV c=1 sm=1 tr=0 ts=6ad08b44 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=Yb5IdVpu1gywAM1esaYA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE1MDAzMCBTYWx0ZWRfX+aTore8O+BcA LtRIpZosTcD00edqnl3IhCSd101lXv/jgB1Zh/3In5Wu54riskwLGG8x9nFK+d6rPJSTbVWC7im x6vDqsVLDrCkTWvKZtQ8bIbSloCDZrI= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE1MDAzMCBTYWx0ZWRfX/dQi40ehFs5i /iilQ+KtcNTFdumj+SWK2KfnOk/f6tEov3N1BkU9kSdvVTSYkVv/zVOt8EseE+7E7IwJ/tzv/m0 QfA5skZK00B9W/4bK3Th2ofjrhRs03/DL05ZcS0dOBd1TlIPfMSUqRrtwEvRlu24BUNnU641Y2i 53LP5Io1hdiU7Nf/fctwGgbgWRz1jgxHvql8zfCipvVAW/6yGoIcc1d2kJQRsF2mcV8IL7tmcKc Dz1s+CwtXicweaQNX5RqIL7oPtr/JSpQq9eK8RnE8FwQTxW9azlR5eBmYWYQJjmRWqetm7lR8Iw lNt7kwtyb7kg7hHgLEKVi2qRURTc4aHMDWs+yWdsUYVTyntTpdNFejYlvRE4giecniD5pdw8oQQ AZkq8PjurwQNg16OpjkCabR1cAYTiheC7VO5uR7O3yjO3HqE8s7ETDV+0fqecZrLtitTgkBpQIV aRx+AsCLnjvHVXLei7Q== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-13_01,2026-10-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1015 spamscore=0 malwarescore=0 suspectscore=0 bulkscore=0 adultscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610150030 The diag dump walks the socket hash table under a read_lock and dereferen= ces conn->lgr and conn->lnk. Four paths expose a window where a hashed socket= has freed or partially freed conn/lgr/lnk state. First, smc_conn_abort() calls smc_conn_free() during early handshake abor= ts while the socket is still hashed in SMC_INIT, synchronously freeing the l= gr on the smc_lgr_cleanup_early() path without holding the hash write_lock. A concurrent diag reader can load a non-NULL conn->lgr and dereference lgr->is_smcd after the kfree. Skip the connection, link group and DMB att= ributes in __smc_diag_dump() for sockets in SMC_INIT or SMC_CLOSED, and do not lo= ok at conn->lgr to determine diag_mode in SMC_INIT. This changes the sock_diag output for such sockets. SMC_DIAG_CONNINFO, SMC_DIAG_LGRINFO and SMC_DIAG_DMBINFO are no longer reported while a sock= et is in SMC_INIT or SMC_CLOSED, and diag_mode is SMC_DIAG_MODE_SMCR for a non-fallback SMC-D socket in SMC_INIT, as it already was before smc_conn_create() had run. smcss does not use these attributes for such s= ockets. Use smp_load_acquire() / smp_store_release() on sk_state to order these c= hecks on weakly ordered CPUs. Second, in smc_conn_kill() on SMC-D with dmb_nocopy, smcd_buf_detach() NU= LLs and frees conn->sndbuf_desc while the socket is still hashed. A concurrent di= ag reader entering the CONNINFO block can dereference the freed descriptor. = Unhash the socket right before smcd_buf_detach(). Other kill paths leave the soc= ket hashed, since it can stay open until close(). Third, in the terminal teardown branches of smc_close_active_abort() (PEERCLOSEWAIT and PROCESSABORT groups) and in smc_close_passive_work(), smc_conn_free() drops lgr and lnk references while the socket is still ha= shed. Unhash immediately before each smc_conn_free() call at those two sites. Fourth, smc_listen_out_err() sets sk_state =3D SMC_CLOSED with a plain st= ore after smc_conn_abort() -> smc_conn_free() has already cleared alert_token_local= under write_lock_bh(). On weakly ordered CPUs a concurrent diag reader using smp_load_acquire() on sk_state can observe SMC_CLOSED while the preceding= store to alert_token_local has not yet become visible, causing it to dereferenc= e an lgr whose reference was already dropped. Use smp_store_release() to order= the alert_token_local clear before the sk_state =3D SMC_CLOSED store. Additionally, in smc_conn_free(), unregister the connection unconditional= ly so alert_token_local is always cleared and the connection is removed from th= e link group's tree even when the link group was already unlinked from the globa= l list during handshake abort or termination (such as server CLC decline fallbac= k). Finally, in __smc_diag_dump(), copy the cached link->ibname instead of dereferencing link->smcibdev->ibdev->name to avoid the NULL pointer deref= erence / UAF if __smcr_link_clear() zeroes the link during concurrent SMC-R link failover. Like the SMC netlink link dump and the tracepoints, this report= s the name at link creation time and does not follow a later ib_device_rename()= . Fixes: f16a7dd5cf27 ("smc: netlink interface for SMC sockets") Fixes: 2a0674fffb6b ("net/smc: improve abnormal termination of link group= s") Fixes: 9dbe086c69b8 ("net/smc: fix invalid link access in dumping SMC-R c= onnections") Fixes: ae2be35cbed2 ("net/smc: {at|de}tach sndbuf to peer DMB if supporte= d") Cc: stable@vger.kernel.org Reviewed-by: Hidayath Khan Reviewed-by: Sidraya Jayagond Signed-off-by: Mahanta Jambigi --- Changes in v11: - smc_core.c: unregister connection unconditionally in smc_conn_free() rather than gating it on !list_empty(&lgr->list), ensuring alert_token_local is always reset to 0 - commit message: add Fixes tag for 2a0674fffb6b and clarify that copying cached link->ibname eliminates the NULL dereference / UAF during concurrent link clearing Changes in v10: - smc_core.c: move the unhash out of the top of smc_conn_kill() into the smc_ism_support_dmb_nocopy() branch, right before smcd_buf_detach(); th= e other kill paths leave ACTIVE/APPCLOSEWAIT sockets open, so they must stay visible to smcss and keep their inuse accounting - commit message: document the sock_diag output changes for sockets in SMC_INIT and SMC_CLOSED (extension attributes omitted, diag_mode of SMC-D in SMC_INIT) and that ibname is the name cached at link creation Changes in v9: - af_smc.c: change plain store in smc_listen_out_err() to smp_store_release(&newsmcsk->sk_state, SMC_CLOSED) to order the preceding alert_token_local clear (done under write_lock_bh() inside smc_conn_free()) before the sk_state write; pairs with the smp_load_acquire() in __smc_diag_dump() to close a use-after-free on weakly ordered CPUs where a diag reader could observe SMC_CLOSED while conn->lgr still appeared live Changes in v8: - smc_diag.c: use smp_load_acquire(&sk->sk_state) to prevent speculative load reordering on weakly ordered CPUs (such as arm64) during handshake abort fallback - af_smc.c: pair with smp_store_release(&sk->sk_state, SMC_ACTIVE) when transitioning out of SMC_INIT - smc_diag.c: copy cached link->ibname instead of chasing link->smcibdev->ibdev->name to prevent NULL pointer dereference / UAF if __smcr_link_clear() zeroes the link during link failover Changes in v7: - no code changes; commit message only - document the SMC_CLOSED leg of the early-exit guard and the rationale that smcss already skips CLOSED sockets on the userspace side; add Fixes: ae2be35cbed2 for the smc_conn_kill() hunk since smcd_buf_detach() was introduced by that commit Changes in v6: - smc_diag.c: inline sk->sk_state !=3D SMC_INIT into the else-if condition so conn->lgr->is_smcd is never loaded for SMC_INIT sockets; retain the SMC_INIT || SMC_CLOSED early-exit guard and out: label from v5 to defensively skip the CONNINFO/LGRINFO/DMBINFO blocks for sockets with no live connection - smc_close.c: remove the unconditional unhash from the top of smc_close_active_abort(); place it scoped immediately before each of the two smc_conn_free() calls in the PEERCLOSEWAIT and PROCESSABORT branches, and before smc_conn_free() in smc_close_passive_work(); this avoids prematurely hiding live SMC_ACTIVE/APPCLOSEWAIT sockets from smcss - smc_core.c: unhash at the top of smc_conn_kill(), before smcd_buf_detach(), so the socket is off the hash table before conn->sndbuf_desc is freed on the dmb_nocopy path Changes in v5: - guard conn/lgr/lnk blocks in __smc_diag_dump() with an (SMC_INIT || SMC_CLOSED) state check placed after the SMC_DIAG_FALLBACK nla_put; SMC_INIT can coexist with fallback (smc_sendmsg() MSG_FASTOPEN path), so the guard must not suppress the fallback reason Changes in v4: - dropped smc_conn_unhash() wrapper, conn->unhashed flag, and all changes to af_smc.c, smc.h, smc_core.c and smc_core.h; smc_unhash_sk() is already idempotent via sk_hashed(), so direct calls at the two teardown sites in smc_close.c are sufficient - dropped the __smc_release() hunk: it needs no change since the subsequent unhash there is already a safe no-op - fixed premature-unhash issue present in v3: smc_conn_free() must not unhash because smc_conn_abort() calls it before smc_switch_to_fallback() in both smc_listen_decline() and smc_connect_rdma() error paths; unhashing there would make live fallback sockets invisible to smcss - likewise, the ISM/RDMA retry loops call smc_conn_abort() on a failed attempt and then smc_conn_create() on the next device; unhashing in smc_conn_free() would permanently hide the established connection from smc_diag since smc_conn_create() does not re-hash the socket Changes in v3: - redesigned as a single patch; dropped the lgr_lnk_lock spinlock approach and the 2-patch split Changes in v2: - split into a 2-patch series; patch 1/2 adds per-connection lgr_lnk_lock infrastructure to smc_core, patch 2/2 fixes the diag dump path using it net/smc/af_smc.c | 10 +++++++--- net/smc/smc_close.c | 3 +++ net/smc/smc_core.c | 6 ++++-- net/smc/smc_diag.c | 12 ++++++++---- 4 files changed, 22 insertions(+), 9 deletions(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index e9f93b3ab435..41b8af13efc4 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -976,7 +976,7 @@ static int smc_connect_fallback(struct smc_sock *smc,= int reason_code) smc_copy_sock_settings_to_clc(smc); smc->connect_nonblock =3D 0; if (smc->sk.sk_state =3D=3D SMC_INIT) - smc->sk.sk_state =3D SMC_ACTIVE; + smp_store_release(&smc->sk.sk_state, SMC_ACTIVE); return 0; } @@ -1381,7 +1381,7 @@ static int smc_connect_rdma(struct smc_sock *smc, smc_copy_sock_settings_to_clc(smc); smc->connect_nonblock =3D 0; if (smc->sk.sk_state =3D=3D SMC_INIT) - smc->sk.sk_state =3D SMC_ACTIVE; + smp_store_release(&smc->sk.sk_state, SMC_ACTIVE); return 0; connect_abort: @@ -1484,7 +1484,7 @@ static int smc_connect_ism(struct smc_sock *smc, smc_copy_sock_settings_to_clc(smc); smc->connect_nonblock =3D 0; if (smc->sk.sk_state =3D=3D SMC_INIT) - smc->sk.sk_state =3D SMC_ACTIVE; + smp_store_release(&smc->sk.sk_state, SMC_ACTIVE); return 0; connect_abort: @@ -1951,7 +1951,7 @@ static void smc_listen_out_connected(struct smc_soc= k *new_smc) struct sock *newsmcsk =3D &new_smc->sk; if (newsmcsk->sk_state =3D=3D SMC_INIT) - newsmcsk->sk_state =3D SMC_ACTIVE; + smp_store_release(&newsmcsk->sk_state, SMC_ACTIVE); smc_listen_out(new_smc); } @@ -1965,7 +1965,7 @@ static void smc_listen_out_err(struct smc_sock *new= _smc) this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt); if (newsmcsk->sk_state =3D=3D SMC_INIT) sock_put(&new_smc->sk); /* passive closing */ - newsmcsk->sk_state =3D SMC_CLOSED; + smp_store_release(&newsmcsk->sk_state, SMC_CLOSED); smc_listen_out(new_smc); } diff --git a/net/smc/smc_close.c b/net/smc/smc_close.c index bb0313ef5f7c..aa6363abdd74 100644 --- a/net/smc/smc_close.c +++ b/net/smc/smc_close.c @@ -154,6 +154,7 @@ void smc_close_active_abort(struct smc_sock *smc) if (sk->sk_state !=3D SMC_PEERABORTWAIT) break; sk->sk_state =3D SMC_CLOSED; + sk->sk_prot->unhash(sk); smc_conn_free(&smc->conn); release_clcsock =3D true; sock_put(sk); /* passive closing */ @@ -165,6 +166,7 @@ void smc_close_active_abort(struct smc_sock *smc) if (sk->sk_state !=3D SMC_PEERABORTWAIT) break; sk->sk_state =3D SMC_CLOSED; + sk->sk_prot->unhash(sk); smc_conn_free(&smc->conn); release_clcsock =3D true; break; @@ -433,6 +435,7 @@ static void smc_close_passive_work(struct work_struct= *work) sk->sk_state_change(sk); if ((sk->sk_state =3D=3D SMC_CLOSED) && (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket)) { + sk->sk_prot->unhash(sk); smc_conn_free(conn); if (smc->clcsock) release_clcsock =3D true; diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index 9974149659c2..6735f185cf48 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -1279,10 +1279,9 @@ void smc_conn_free(struct smc_connection *conn) if (current_work() !=3D &conn->abort_work) cancel_work_sync(&conn->abort_work); } - if (!list_empty(&lgr->list)) { + if (!list_empty(&lgr->list)) smc_buf_unuse(conn, lgr); /* allow buffer reuse */ - smc_lgr_unregister_conn(conn); - } + smc_lgr_unregister_conn(conn); if (!lgr->conns_num) smc_lgr_schedule_free_work(lgr); @@ -1530,8 +1529,10 @@ static void smc_conn_kill(struct smc_connection *c= onn, bool soft) tasklet_kill(&conn->rx_tsklet); else tasklet_unlock_wait(&conn->rx_tsklet); - if (smc_ism_support_dmb_nocopy(conn->lgr->smcd)) + if (smc_ism_support_dmb_nocopy(conn->lgr->smcd)) { + smc->sk.sk_prot->unhash(&smc->sk); smcd_buf_detach(conn); + } } else { smc_cdc_wait_pend_tx_wr(conn); } diff --git a/net/smc/smc_diag.c b/net/smc/smc_diag.c index bf0beaa23bdb..36a3b8f31f28 100644 --- a/net/smc/smc_diag.c +++ b/net/smc/smc_diag.c @@ -87,10 +87,11 @@ static int __smc_diag_dump(struct sock *sk, struct sk= _buff *skb, r =3D nlmsg_data(nlh); smc_diag_msg_common_fill(r, sk); - r->diag_state =3D sk->sk_state; + r->diag_state =3D smp_load_acquire(&sk->sk_state); if (smc->use_fallback) r->diag_mode =3D SMC_DIAG_MODE_FALLBACK_TCP; - else if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd) + else if (r->diag_state !=3D SMC_INIT && + smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd) r->diag_mode =3D SMC_DIAG_MODE_SMCD; else r->diag_mode =3D SMC_DIAG_MODE_SMCR; @@ -103,6 +104,9 @@ static int __smc_diag_dump(struct sock *sk, struct sk= _buff *skb, if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0) goto errout; + if (r->diag_state =3D=3D SMC_INIT || r->diag_state =3D=3D SMC_CLOSED) + goto out; + if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) && smc->conn.alert_token_local) { struct smc_connection *conn =3D &smc->conn; @@ -154,8 +158,7 @@ static int __smc_diag_dump(struct sock *sk, struct sk= _buff *skb, .lnk[0].link_id =3D link->link_id, }; - memcpy(linfo.lnk[0].ibname, link->smcibdev->ibdev->name, - sizeof(link->smcibdev->ibdev->name)); + memcpy(linfo.lnk[0].ibname, link->ibname, sizeof(link->ibname)); smc_gid_be16_convert(linfo.lnk[0].gid, link->gid); smc_gid_be16_convert(linfo.lnk[0].peer_gid, link->peer_gid); @@ -185,6 +188,7 @@ static int __smc_diag_dump(struct sock *sk, struct sk= _buff *skb, goto errout; } +out: nlmsg_end(skb, nlh); return 0; --=20 2.50.1 (Apple Git-155)