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![Eric Dumazet](/assets/img/avatar_default.png)
[ Upstream commitdc9511dd6f
] sk->sk_wmem_queued can be read locklessly from sctp_poll() Use sk_wmem_queued_add() when the field is changed, and add READ_ONCE() annotations in sctp_writeable() and sctp_assocs_seq_show() syzbot reported: BUG: KCSAN: data-race in sctp_poll / sctp_wfree read-write to 0xffff888149d77810 of 4 bytes by interrupt on cpu 0: sctp_wfree+0x170/0x4a0 net/sctp/socket.c:9147 skb_release_head_state+0xb7/0x1a0 net/core/skbuff.c:988 skb_release_all net/core/skbuff.c:1000 [inline] __kfree_skb+0x16/0x140 net/core/skbuff.c:1016 consume_skb+0x57/0x180 net/core/skbuff.c:1232 sctp_chunk_destroy net/sctp/sm_make_chunk.c:1503 [inline] sctp_chunk_put+0xcd/0x130 net/sctp/sm_make_chunk.c:1530 sctp_datamsg_put+0x29a/0x300 net/sctp/chunk.c:128 sctp_chunk_free+0x34/0x50 net/sctp/sm_make_chunk.c:1515 sctp_outq_sack+0xafa/0xd70 net/sctp/outqueue.c:1381 sctp_cmd_process_sack net/sctp/sm_sideeffect.c:834 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1366 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline] sctp_do_sm+0x12c7/0x31b0 net/sctp/sm_sideeffect.c:1169 sctp_assoc_bh_rcv+0x2b2/0x430 net/sctp/associola.c:1051 sctp_inq_push+0x108/0x120 net/sctp/inqueue.c:80 sctp_rcv+0x116e/0x1340 net/sctp/input.c:243 sctp6_rcv+0x25/0x40 net/sctp/ipv6.c:1120 ip6_protocol_deliver_rcu+0x92f/0xf30 net/ipv6/ip6_input.c:437 ip6_input_finish net/ipv6/ip6_input.c:482 [inline] NF_HOOK include/linux/netfilter.h:303 [inline] ip6_input+0xbd/0x1b0 net/ipv6/ip6_input.c:491 dst_input include/net/dst.h:468 [inline] ip6_rcv_finish+0x1e2/0x2e0 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:303 [inline] ipv6_rcv+0x74/0x150 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core net/core/dev.c:5452 [inline] __netif_receive_skb+0x90/0x1b0 net/core/dev.c:5566 process_backlog+0x21f/0x380 net/core/dev.c:5894 __napi_poll+0x60/0x3b0 net/core/dev.c:6460 napi_poll net/core/dev.c:6527 [inline] net_rx_action+0x32b/0x750 net/core/dev.c:6660 __do_softirq+0xc1/0x265 kernel/softirq.c:553 run_ksoftirqd+0x17/0x20 kernel/softirq.c:921 smpboot_thread_fn+0x30a/0x4a0 kernel/smpboot.c:164 kthread+0x1d7/0x210 kernel/kthread.c:389 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 read to 0xffff888149d77810 of 4 bytes by task 17828 on cpu 1: sctp_writeable net/sctp/socket.c:9304 [inline] sctp_poll+0x265/0x410 net/sctp/socket.c:8671 sock_poll+0x253/0x270 net/socket.c:1374 vfs_poll include/linux/poll.h:88 [inline] do_pollfd fs/select.c:873 [inline] do_poll fs/select.c:921 [inline] do_sys_poll+0x636/0xc00 fs/select.c:1015 __do_sys_ppoll fs/select.c:1121 [inline] __se_sys_ppoll+0x1af/0x1f0 fs/select.c:1101 __x64_sys_ppoll+0x67/0x80 fs/select.c:1101 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x00019e80 -> 0x0000cc80 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 17828 Comm: syz-executor.1 Not tainted 6.5.0-rc7-syzkaller-00185-g28f20a19294d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Fixes:1da177e4c3
("Linux-2.6.12-rc2") Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Acked-by: Xin Long <lucien.xin@gmail.com> Link: https://lore.kernel.org/r/20230830094519.950007-1-edumazet@google.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
399 lines
11 KiB
C
399 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* SCTP kernel implementation
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* Copyright (c) 2003 International Business Machines, Corp.
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*
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* This file is part of the SCTP kernel implementation
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Sridhar Samudrala <sri@us.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <net/sctp/sctp.h>
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#include <net/ip.h> /* for snmp_fold_field */
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static const struct snmp_mib sctp_snmp_list[] = {
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SNMP_MIB_ITEM("SctpCurrEstab", SCTP_MIB_CURRESTAB),
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SNMP_MIB_ITEM("SctpActiveEstabs", SCTP_MIB_ACTIVEESTABS),
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SNMP_MIB_ITEM("SctpPassiveEstabs", SCTP_MIB_PASSIVEESTABS),
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SNMP_MIB_ITEM("SctpAborteds", SCTP_MIB_ABORTEDS),
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SNMP_MIB_ITEM("SctpShutdowns", SCTP_MIB_SHUTDOWNS),
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SNMP_MIB_ITEM("SctpOutOfBlues", SCTP_MIB_OUTOFBLUES),
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SNMP_MIB_ITEM("SctpChecksumErrors", SCTP_MIB_CHECKSUMERRORS),
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SNMP_MIB_ITEM("SctpOutCtrlChunks", SCTP_MIB_OUTCTRLCHUNKS),
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SNMP_MIB_ITEM("SctpOutOrderChunks", SCTP_MIB_OUTORDERCHUNKS),
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SNMP_MIB_ITEM("SctpOutUnorderChunks", SCTP_MIB_OUTUNORDERCHUNKS),
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SNMP_MIB_ITEM("SctpInCtrlChunks", SCTP_MIB_INCTRLCHUNKS),
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SNMP_MIB_ITEM("SctpInOrderChunks", SCTP_MIB_INORDERCHUNKS),
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SNMP_MIB_ITEM("SctpInUnorderChunks", SCTP_MIB_INUNORDERCHUNKS),
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SNMP_MIB_ITEM("SctpFragUsrMsgs", SCTP_MIB_FRAGUSRMSGS),
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SNMP_MIB_ITEM("SctpReasmUsrMsgs", SCTP_MIB_REASMUSRMSGS),
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SNMP_MIB_ITEM("SctpOutSCTPPacks", SCTP_MIB_OUTSCTPPACKS),
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SNMP_MIB_ITEM("SctpInSCTPPacks", SCTP_MIB_INSCTPPACKS),
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SNMP_MIB_ITEM("SctpT1InitExpireds", SCTP_MIB_T1_INIT_EXPIREDS),
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SNMP_MIB_ITEM("SctpT1CookieExpireds", SCTP_MIB_T1_COOKIE_EXPIREDS),
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SNMP_MIB_ITEM("SctpT2ShutdownExpireds", SCTP_MIB_T2_SHUTDOWN_EXPIREDS),
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SNMP_MIB_ITEM("SctpT3RtxExpireds", SCTP_MIB_T3_RTX_EXPIREDS),
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SNMP_MIB_ITEM("SctpT4RtoExpireds", SCTP_MIB_T4_RTO_EXPIREDS),
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SNMP_MIB_ITEM("SctpT5ShutdownGuardExpireds", SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS),
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SNMP_MIB_ITEM("SctpDelaySackExpireds", SCTP_MIB_DELAY_SACK_EXPIREDS),
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SNMP_MIB_ITEM("SctpAutocloseExpireds", SCTP_MIB_AUTOCLOSE_EXPIREDS),
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SNMP_MIB_ITEM("SctpT3Retransmits", SCTP_MIB_T3_RETRANSMITS),
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SNMP_MIB_ITEM("SctpPmtudRetransmits", SCTP_MIB_PMTUD_RETRANSMITS),
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SNMP_MIB_ITEM("SctpFastRetransmits", SCTP_MIB_FAST_RETRANSMITS),
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SNMP_MIB_ITEM("SctpInPktSoftirq", SCTP_MIB_IN_PKT_SOFTIRQ),
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SNMP_MIB_ITEM("SctpInPktBacklog", SCTP_MIB_IN_PKT_BACKLOG),
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SNMP_MIB_ITEM("SctpInPktDiscards", SCTP_MIB_IN_PKT_DISCARDS),
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SNMP_MIB_ITEM("SctpInDataChunkDiscards", SCTP_MIB_IN_DATA_CHUNK_DISCARDS),
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SNMP_MIB_SENTINEL
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};
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/* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */
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static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
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{
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unsigned long buff[SCTP_MIB_MAX];
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struct net *net = seq->private;
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int i;
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memset(buff, 0, sizeof(unsigned long) * SCTP_MIB_MAX);
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snmp_get_cpu_field_batch(buff, sctp_snmp_list,
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net->sctp.sctp_statistics);
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for (i = 0; sctp_snmp_list[i].name; i++)
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seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name,
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buff[i]);
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return 0;
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}
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/* Dump local addresses of an association/endpoint. */
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static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)
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{
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struct sctp_association *asoc;
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struct sctp_sockaddr_entry *laddr;
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struct sctp_transport *peer;
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union sctp_addr *addr, *primary = NULL;
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struct sctp_af *af;
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if (epb->type == SCTP_EP_TYPE_ASSOCIATION) {
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asoc = sctp_assoc(epb);
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peer = asoc->peer.primary_path;
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if (unlikely(peer == NULL)) {
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WARN(1, "Association %p with NULL primary path!\n", asoc);
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return;
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}
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primary = &peer->saddr;
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}
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rcu_read_lock();
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list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) {
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if (!laddr->valid)
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continue;
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addr = &laddr->a;
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af = sctp_get_af_specific(addr->sa.sa_family);
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if (primary && af->cmp_addr(addr, primary)) {
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seq_printf(seq, "*");
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}
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af->seq_dump_addr(seq, addr);
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}
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rcu_read_unlock();
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}
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/* Dump remote addresses of an association. */
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static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc)
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{
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struct sctp_transport *transport;
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union sctp_addr *addr, *primary;
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struct sctp_af *af;
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primary = &assoc->peer.primary_addr;
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list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list,
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transports) {
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addr = &transport->ipaddr;
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af = sctp_get_af_specific(addr->sa.sa_family);
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if (af->cmp_addr(addr, primary)) {
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seq_printf(seq, "*");
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}
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af->seq_dump_addr(seq, addr);
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}
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}
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static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos)
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{
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if (*pos >= sctp_ep_hashsize)
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return NULL;
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if (*pos < 0)
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*pos = 0;
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if (*pos == 0)
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seq_printf(seq, " ENDPT SOCK STY SST HBKT LPORT UID INODE LADDRS\n");
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return (void *)pos;
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}
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static void sctp_eps_seq_stop(struct seq_file *seq, void *v)
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{
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}
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static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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if (++*pos >= sctp_ep_hashsize)
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return NULL;
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return pos;
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}
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/* Display sctp endpoints (/proc/net/sctp/eps). */
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static int sctp_eps_seq_show(struct seq_file *seq, void *v)
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{
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struct sctp_hashbucket *head;
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struct sctp_endpoint *ep;
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struct sock *sk;
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int hash = *(loff_t *)v;
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if (hash >= sctp_ep_hashsize)
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return -ENOMEM;
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head = &sctp_ep_hashtable[hash];
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read_lock_bh(&head->lock);
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sctp_for_each_hentry(ep, &head->chain) {
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sk = ep->base.sk;
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if (!net_eq(sock_net(sk), seq_file_net(seq)))
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continue;
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seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk,
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sctp_sk(sk)->type, sk->sk_state, hash,
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ep->base.bind_addr.port,
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from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
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sock_i_ino(sk));
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sctp_seq_dump_local_addrs(seq, &ep->base);
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seq_printf(seq, "\n");
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}
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read_unlock_bh(&head->lock);
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return 0;
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}
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static const struct seq_operations sctp_eps_ops = {
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.start = sctp_eps_seq_start,
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.next = sctp_eps_seq_next,
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.stop = sctp_eps_seq_stop,
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.show = sctp_eps_seq_show,
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};
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struct sctp_ht_iter {
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struct seq_net_private p;
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struct rhashtable_iter hti;
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};
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static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos)
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{
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struct sctp_ht_iter *iter = seq->private;
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sctp_transport_walk_start(&iter->hti);
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return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos);
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}
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static void sctp_transport_seq_stop(struct seq_file *seq, void *v)
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{
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struct sctp_ht_iter *iter = seq->private;
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if (v && v != SEQ_START_TOKEN) {
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struct sctp_transport *transport = v;
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sctp_transport_put(transport);
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}
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sctp_transport_walk_stop(&iter->hti);
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}
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static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct sctp_ht_iter *iter = seq->private;
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if (v && v != SEQ_START_TOKEN) {
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struct sctp_transport *transport = v;
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sctp_transport_put(transport);
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}
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++*pos;
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return sctp_transport_get_next(seq_file_net(seq), &iter->hti);
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}
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/* Display sctp associations (/proc/net/sctp/assocs). */
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static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
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{
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struct sctp_transport *transport;
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struct sctp_association *assoc;
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struct sctp_ep_common *epb;
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struct sock *sk;
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if (v == SEQ_START_TOKEN) {
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seq_printf(seq, " ASSOC SOCK STY SST ST HBKT "
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"ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
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"RPORT LADDRS <-> RADDRS "
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"HBINT INS OUTS MAXRT T1X T2X RTXC "
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"wmema wmemq sndbuf rcvbuf\n");
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return 0;
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}
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transport = (struct sctp_transport *)v;
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assoc = transport->asoc;
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epb = &assoc->base;
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sk = epb->sk;
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seq_printf(seq,
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"%8pK %8pK %-3d %-3d %-2d %-4d "
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"%4d %8d %8d %7u %5lu %-5d %5d ",
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assoc, sk, sctp_sk(sk)->type, sk->sk_state,
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assoc->state, 0,
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assoc->assoc_id,
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assoc->sndbuf_used,
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atomic_read(&assoc->rmem_alloc),
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from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
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sock_i_ino(sk),
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epb->bind_addr.port,
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assoc->peer.port);
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seq_printf(seq, " ");
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sctp_seq_dump_local_addrs(seq, epb);
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seq_printf(seq, "<-> ");
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sctp_seq_dump_remote_addrs(seq, assoc);
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seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d "
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"%8d %8d %8d %8d",
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assoc->hbinterval, assoc->stream.incnt,
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assoc->stream.outcnt, assoc->max_retrans,
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assoc->init_retries, assoc->shutdown_retries,
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assoc->rtx_data_chunks,
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refcount_read(&sk->sk_wmem_alloc),
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READ_ONCE(sk->sk_wmem_queued),
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sk->sk_sndbuf,
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sk->sk_rcvbuf);
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seq_printf(seq, "\n");
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return 0;
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}
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static const struct seq_operations sctp_assoc_ops = {
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.start = sctp_transport_seq_start,
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.next = sctp_transport_seq_next,
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.stop = sctp_transport_seq_stop,
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.show = sctp_assocs_seq_show,
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};
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static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
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{
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struct sctp_association *assoc;
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struct sctp_transport *transport, *tsp;
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if (v == SEQ_START_TOKEN) {
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seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX "
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"REM_ADDR_RTX START STATE\n");
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return 0;
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}
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transport = (struct sctp_transport *)v;
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assoc = transport->asoc;
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list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
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transports) {
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/*
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* The remote address (ADDR)
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*/
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tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr);
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seq_printf(seq, " ");
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/*
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* The association ID (ASSOC_ID)
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*/
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seq_printf(seq, "%d ", tsp->asoc->assoc_id);
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/*
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* If the Heartbeat is active (HB_ACT)
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* Note: 1 = Active, 0 = Inactive
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*/
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seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer));
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/*
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* Retransmit time out (RTO)
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*/
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seq_printf(seq, "%lu ", tsp->rto);
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/*
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* Maximum path retransmit count (PATH_MAX_RTX)
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*/
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seq_printf(seq, "%d ", tsp->pathmaxrxt);
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/*
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* remote address retransmit count (REM_ADDR_RTX)
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* Note: We don't have a way to tally this at the moment
|
|
* so lets just leave it as zero for the moment
|
|
*/
|
|
seq_puts(seq, "0 ");
|
|
|
|
/*
|
|
* remote address start time (START). This is also not
|
|
* currently implemented, but we can record it with a
|
|
* jiffies marker in a subsequent patch
|
|
*/
|
|
seq_puts(seq, "0 ");
|
|
|
|
/*
|
|
* The current state of this destination. I.e.
|
|
* SCTP_ACTIVE, SCTP_INACTIVE, ...
|
|
*/
|
|
seq_printf(seq, "%d", tsp->state);
|
|
|
|
seq_printf(seq, "\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations sctp_remaddr_ops = {
|
|
.start = sctp_transport_seq_start,
|
|
.next = sctp_transport_seq_next,
|
|
.stop = sctp_transport_seq_stop,
|
|
.show = sctp_remaddr_seq_show,
|
|
};
|
|
|
|
/* Set up the proc fs entry for the SCTP protocol. */
|
|
int __net_init sctp_proc_init(struct net *net)
|
|
{
|
|
net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
|
|
if (!net->sctp.proc_net_sctp)
|
|
return -ENOMEM;
|
|
if (!proc_create_net_single("snmp", 0444, net->sctp.proc_net_sctp,
|
|
sctp_snmp_seq_show, NULL))
|
|
goto cleanup;
|
|
if (!proc_create_net("eps", 0444, net->sctp.proc_net_sctp,
|
|
&sctp_eps_ops, sizeof(struct seq_net_private)))
|
|
goto cleanup;
|
|
if (!proc_create_net("assocs", 0444, net->sctp.proc_net_sctp,
|
|
&sctp_assoc_ops, sizeof(struct sctp_ht_iter)))
|
|
goto cleanup;
|
|
if (!proc_create_net("remaddr", 0444, net->sctp.proc_net_sctp,
|
|
&sctp_remaddr_ops, sizeof(struct sctp_ht_iter)))
|
|
goto cleanup;
|
|
return 0;
|
|
|
|
cleanup:
|
|
remove_proc_subtree("sctp", net->proc_net);
|
|
net->sctp.proc_net_sctp = NULL;
|
|
return -ENOMEM;
|
|
}
|