linux/net/ipv4
Ido Schimmel 263e463358 ipv4: Silence suspicious RCU usage warning
[ Upstream commit 7f6f32bb7d ]

fib_info_notify_update() is always called with RTNL held, but not from
an RCU read-side critical section. This leads to the following warning
[1] when the FIB table list is traversed with
hlist_for_each_entry_rcu(), but without a proper lockdep expression.

Since modification of the list is protected by RTNL, silence the warning
by adding a lockdep expression which verifies RTNL is held.

[1]
 =============================
 WARNING: suspicious RCU usage
 5.9.0-rc1-custom-14233-g2f26e122d62f #129 Not tainted
 -----------------------------
 net/ipv4/fib_trie.c:2124 RCU-list traversed in non-reader section!!

 other info that might help us debug this:

 rcu_scheduler_active = 2, debug_locks = 1
 1 lock held by ip/834:
  #0: ffffffff85a3b6b0 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x49a/0xbd0

 stack backtrace:
 CPU: 0 PID: 834 Comm: ip Not tainted 5.9.0-rc1-custom-14233-g2f26e122d62f #129
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-2.fc32 04/01/2014
 Call Trace:
  dump_stack+0x100/0x184
  lockdep_rcu_suspicious+0x143/0x14d
  fib_info_notify_update+0x8d1/0xa60
  __nexthop_replace_notify+0xd2/0x290
  rtm_new_nexthop+0x35e2/0x5946
  rtnetlink_rcv_msg+0x4f7/0xbd0
  netlink_rcv_skb+0x17a/0x480
  rtnetlink_rcv+0x22/0x30
  netlink_unicast+0x5ae/0x890
  netlink_sendmsg+0x98a/0xf40
  ____sys_sendmsg+0x879/0xa00
  ___sys_sendmsg+0x122/0x190
  __sys_sendmsg+0x103/0x1d0
  __x64_sys_sendmsg+0x7d/0xb0
  do_syscall_64+0x32/0x50
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
 RIP: 0033:0x7fde28c3be57
 Code: 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51
c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
RSP: 002b:00007ffc09330028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fde28c3be57
RDX: 0000000000000000 RSI: 00007ffc09330090 RDI: 0000000000000003
RBP: 000000005f45f911 R08: 0000000000000001 R09: 00007ffc0933012c
R10: 0000000000000076 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc09330290 R14: 00007ffc09330eee R15: 00005610e48ed020

Fixes: 1bff1a0c9b ("ipv4: Add function to send route updates")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-12 14:18:54 +02:00
..
bpfilter
netfilter netfilter: nf_conntrack_pptp: prevent buffer overflows in debug code 2020-06-03 08:21:35 +02:00
Kconfig vti[6]: fix packet tx through bpf_redirect() in XinY cases 2020-04-01 11:02:05 +02:00
Makefile
af_inet.c
ah4.c
arp.c
cipso_ipv4.c netlabel: cope with NULL catmap 2020-05-20 08:20:08 +02:00
datagram.c
devinet.c devinet: fix memleak in inetdev_init() 2020-06-10 20:24:54 +02:00
esp4.c
esp4_offload.c xfrm: remove the xfrm_state_put call becofe going to out_reset 2020-06-03 08:21:32 +02:00
fib_frontend.c ipv4: nexthop version of fib_info_nh_uses_dev 2020-06-03 08:21:37 +02:00
fib_lookup.h
fib_notifier.c
fib_rules.c
fib_semantics.c net: Fix the arp error in some cases 2020-06-30 15:36:44 -04:00
fib_trie.c ipv4: Silence suspicious RCU usage warning 2020-09-12 14:18:54 +02:00
fou.c fou: Fix IPv6 netlink policy 2020-01-29 16:45:22 +01:00
gre_demux.c gre: fix uninit-value in __iptunnel_pull_header 2020-03-18 07:17:38 +01:00
gre_offload.c net: gre: recompute gre csum for sctp over gre tunnels 2020-08-11 15:33:40 +02:00
icmp.c ip: Fix SO_MARK in RST, ACK and ICMP packets 2020-07-22 09:32:50 +02:00
igmp.c
inet_connection_sock.c net: refactor bind_bucket fastreuse into helper 2020-08-19 08:16:23 +02:00
inet_diag.c inet_diag: return classid for all socket types 2020-03-18 07:17:38 +01:00
inet_fragment.c
inet_hashtables.c net: initialize fastreuse on inet_inherit_port 2020-08-19 08:16:23 +02:00
inet_timewait_sock.c
inetpeer.c
ip_forward.c
ip_fragment.c
ip_gre.c net: ip_gre: Accept IFLA_INFO_DATA-less configuration 2020-04-01 11:01:46 +02:00
ip_input.c
ip_options.c
ip_output.c ip: Fix SO_MARK in RST, ACK and ICMP packets 2020-07-22 09:32:50 +02:00
ip_sockglue.c
ip_tunnel.c ip_tunnel: fix use-after-free in ip_tunnel_lookup() 2020-06-30 15:36:46 -04:00
ip_tunnel_core.c
ip_vti.c ip_vti: receive ipip packet by calling ip_tunnel_rcv 2020-06-03 08:21:34 +02:00
ipcomp.c
ipconfig.c
ipip.c net: ipip: fix wrong address family in init error path 2020-06-03 08:20:52 +02:00
ipmr.c net: don't return invalid table id error when we fall back to PF_UNSPEC 2020-06-03 08:20:41 +02:00
ipmr_base.c
metrics.c
netfilter.c
netlink.c
nexthop.c net: nexthop: don't allow empty NHA_GROUP 2020-09-03 11:26:40 +02:00
ping.c ipv4: fill fl4_icmp_{type,code} in ping_v4_sendmsg 2020-07-22 09:32:47 +02:00
proc.c
protocol.c
raw.c
raw_diag.c inet_diag: return classid for all socket types 2020-03-18 07:17:38 +01:00
route.c net: revert "net: get rid of an signed integer overflow in ip_idents_reserve()" 2020-06-03 08:21:00 +02:00
syncookies.c
sysctl_net_ipv4.c tcp: correct read of TFO keys on big endian systems 2020-08-19 08:16:23 +02:00
tcp.c tcp: correct read of TFO keys on big endian systems 2020-08-19 08:16:23 +02:00
tcp_bbr.c tcp_bbr: improve arithmetic division in bbr_update_bw() 2020-01-29 16:45:21 +01:00
tcp_bic.c
tcp_bpf.c bpf/sockmap: Fix kernel panic at __tcp_bpf_recvmsg 2020-06-24 17:50:42 +02:00
tcp_cdg.c
tcp_cong.c tcp: make sure listeners don't initialize congestion-control state 2020-07-22 09:32:48 +02:00
tcp_cubic.c tcp_cubic: fix spurious HYSTART_DELAY exit upon drop in min RTT 2020-06-30 15:36:47 -04:00
tcp_dctcp.c
tcp_dctcp.h
tcp_diag.c
tcp_fastopen.c tcp: correct read of TFO keys on big endian systems 2020-08-19 08:16:23 +02:00
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c
tcp_input.c tcp: apply a floor of 1 for RTT samples from TCP timestamps 2020-08-11 15:33:41 +02:00
tcp_ipv4.c tcp: md5: refine tcp_md5_do_add()/tcp_md5_hash_key() barriers 2020-07-22 09:32:49 +02:00
tcp_lp.c
tcp_metrics.c
tcp_minisocks.c
tcp_nv.c
tcp_offload.c
tcp_output.c tcp: allow at most one TLP probe per flight 2020-07-31 18:39:31 +02:00
tcp_rate.c
tcp_recovery.c
tcp_scalable.c
tcp_timer.c
tcp_ulp.c bpf: Sockmap/tls, push write_space updates through ulp updates 2020-01-23 08:22:45 +01:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tunnel4.c
udp.c udp: Improve load balancing for SO_REUSEPORT. 2020-07-31 18:39:31 +02:00
udp_diag.c inet_diag: return classid for all socket types 2020-03-18 07:17:38 +01:00
udp_impl.h
udp_offload.c
udp_tunnel.c
udplite.c
xfrm4_input.c
xfrm4_output.c xfrm: Always set XFRM_TRANSFORMED in xfrm{4,6}_output_finish 2020-04-29 16:33:11 +02:00
xfrm4_policy.c net: add bool confirm_neigh parameter for dst_ops.update_pmtu 2020-01-04 19:18:58 +01:00
xfrm4_protocol.c
xfrm4_state.c
xfrm4_tunnel.c