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linux/net/smc
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Wen Gu dbc153fd3c net/smc: fix illegal rmb_desc access in SMC-D connection dump 
A crash was found when dumping SMC-D connections. It can be reproduced
by following steps:

- run nginx/wrk test:
  smc_run nginx
  smc_run wrk -t 16 -c 1000 -d <duration> -H 'Connection: Close' <URL>

- continuously dump SMC-D connections in parallel:
  watch -n 1 'smcss -D'

 BUG: kernel NULL pointer dereference, address: 0000000000000030
 CPU: 2 PID: 7204 Comm: smcss Kdump: loaded Tainted: G	E      6.7.0+ #55
 RIP: 0010:__smc_diag_dump.constprop.0+0x5e5/0x620 [smc_diag]
 Call Trace:
  <TASK>
  ? __die+0x24/0x70
  ? page_fault_oops+0x66/0x150
  ? exc_page_fault+0x69/0x140
  ? asm_exc_page_fault+0x26/0x30
  ? __smc_diag_dump.constprop.0+0x5e5/0x620 [smc_diag]
  ? __kmalloc_node_track_caller+0x35d/0x430
  ? __alloc_skb+0x77/0x170
  smc_diag_dump_proto+0xd0/0xf0 [smc_diag]
  smc_diag_dump+0x26/0x60 [smc_diag]
  netlink_dump+0x19f/0x320
  __netlink_dump_start+0x1dc/0x300
  smc_diag_handler_dump+0x6a/0x80 [smc_diag]
  ? __pfx_smc_diag_dump+0x10/0x10 [smc_diag]
  sock_diag_rcv_msg+0x121/0x140
  ? __pfx_sock_diag_rcv_msg+0x10/0x10
  netlink_rcv_skb+0x5a/0x110
  sock_diag_rcv+0x28/0x40
  netlink_unicast+0x22a/0x330
  netlink_sendmsg+0x1f8/0x420
  __sock_sendmsg+0xb0/0xc0
  ____sys_sendmsg+0x24e/0x300
  ? copy_msghdr_from_user+0x62/0x80
  ___sys_sendmsg+0x7c/0xd0
  ? __do_fault+0x34/0x160
  ? do_read_fault+0x5f/0x100
  ? do_fault+0xb0/0x110
  ? __handle_mm_fault+0x2b0/0x6c0
  __sys_sendmsg+0x4d/0x80
  do_syscall_64+0x69/0x180
  entry_SYSCALL_64_after_hwframe+0x6e/0x76

It is possible that the connection is in process of being established
when we dump it. Assumed that the connection has been registered in a
link group by smc_conn_create() but the rmb_desc has not yet been
initialized by smc_buf_create(), thus causing the illegal access to
conn->rmb_desc. So fix it by checking before dump.

Fixes: 4b1b7d3b30 ("net/smc: add SMC-D diag support")
Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2024-01-19 12:04:17 +00:00
..
af_smc.c net/smc: compatible with 128-bits extended GID of virtual ISM device 2023-12-26 20:24:33 +00:00
Kconfig net/smc: Fix dependency of SMC on ISM 2023-10-10 11:51:41 +02:00
Makefile net/smc: fix compile warning for smc_sysctl 2022-03-07 11:59:17 +00:00
smc_cdc.c net/smc: allow cdc msg send rather than drop it with NULL sndbuf_desc 2023-11-06 10:01:07 +00:00
smc_cdc.h net/smc: fix kernel panic caused by race of smc_sock 2021-12-28 12:42:45 +00:00
smc_clc.c net/smc: disable SEID on non-s390 archs where virtual ISM may be used 2023-12-26 20:24:33 +00:00
smc_clc.h net/smc: compatible with 128-bits extended GID of virtual ISM device 2023-12-26 20:24:33 +00:00
smc_close.c net/smc: put sk reference if close work was canceled 2023-11-06 10:01:07 +00:00
smc_close.h
smc_core.c net/smc: support extended GID in SMC-D lgr netlink attribute 2023-12-26 20:24:33 +00:00
smc_core.h net/smc: compatible with 128-bits extended GID of virtual ISM device 2023-12-26 20:24:33 +00:00
smc_diag.c net/smc: fix illegal rmb_desc access in SMC-D connection dump 2024-01-19 12:04:17 +00:00
smc_ib.c mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER 2024-01-08 15:27:15 -08:00
smc_ib.h net/smc: fix smc clc failed issue when netdevice not in init_net 2023-10-13 16:52:02 -07:00
smc_ism.c net/smc: manage system EID in SMC stack instead of ISM driver 2023-12-26 20:24:33 +00:00
smc_ism.h net/smc: manage system EID in SMC stack instead of ISM driver 2023-12-26 20:24:33 +00:00
smc_llc.c net/smc: support max links per lgr negotiation in clc handshake 2023-08-19 12:46:53 +01:00
smc_llc.h net/smc: Introduce a specific sysctl for TEST_LINK time 2022-09-22 12:58:21 +02:00
smc_netlink.c genetlink: start to validate reserved header bytes 2022-08-29 12:47:15 +01:00
smc_netlink.h
smc_netns.h
smc_pnet.c net/smc: compatible with 128-bits extended GID of virtual ISM device 2023-12-26 20:24:33 +00:00
smc_pnet.h net/smc: Use a mutex for locking "struct smc_pnettable" 2022-02-24 09:09:33 -08:00
smc_rx.c net: deal with most data-races in sk_wait_event() 2023-05-10 10:03:32 +01:00
smc_rx.h
smc_stats.c smc: Drop smc_sendpage() in favour of smc_sendmsg() + MSG_SPLICE_PAGES 2023-06-24 15:50:12 -07:00
smc_stats.h net/smc: Fix pos miscalculation in statistics 2023-10-11 10:36:35 +01:00
smc_sysctl.c net/smc: add sysctl for max conns per lgr for SMC-R v2.1 2023-11-24 12:13:14 +00:00
smc_sysctl.h net/smc: add sysctl for max conns per lgr for SMC-R v2.1 2023-11-24 12:13:14 +00:00
smc_tracepoint.c net/smc: Introduce tracepoint for smcr link down 2021-11-01 13:39:14 +00:00
smc_tracepoint.h net/smc: Add net namespace for tracepoints 2022-01-02 12:07:39 +00:00
smc_tx.c net/smc: remove unneeded atomic operations in smc_tx_sndbuf_nonempty 2023-11-24 15:00:47 +00:00
smc_tx.h smc: Drop smc_sendpage() in favour of smc_sendmsg() + MSG_SPLICE_PAGES 2023-06-24 15:50:12 -07:00
smc_wr.c net/smc: Use percpu ref for wr tx reference 2023-03-17 08:59:01 +00:00
smc_wr.h net/smc: Use percpu ref for wr tx reference 2023-03-17 08:59:01 +00:00
smc.h net/smc: compatible with 128-bits extended GID of virtual ISM device 2023-12-26 20:24:33 +00:00