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mirror-linux/net/ipv6
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Jiayuan Chen 1adaea51c6 ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT 
On PREEMPT_RT kernels, after rt6_get_pcpu_route() returns NULL, the
current task can be preempted. Another task running on the same CPU
may then execute rt6_make_pcpu_route() and successfully install a
pcpu_rt entry. When the first task resumes execution, its cmpxchg()
in rt6_make_pcpu_route() will fail because rt6i_pcpu is no longer
NULL, triggering the BUG_ON(prev). It's easy to reproduce it by adding
mdelay() after rt6_get_pcpu_route().

Using preempt_disable/enable is not appropriate here because
ip6_rt_pcpu_alloc() may sleep.

Fix this by handling the cmpxchg() failure gracefully on PREEMPT_RT:
free our allocation and return the existing pcpu_rt installed by
another task. The BUG_ON is replaced by WARN_ON_ONCE for non-PREEMPT_RT
kernels where such races should not occur.

Link: https://syzkaller.appspot.com/bug?extid=9b35e9bc0951140d13e6
Fixes: d2d6422f8b ("x86: Allow to enable PREEMPT_RT.")
Reported-by: syzbot+9b35e9bc0951140d13e6@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/6918cd88.050a0220.1c914e.0045.GAE@google.com/T/
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Link: https://patch.msgid.link/20251223051413.124687-1-jiayuan.chen@linux.dev
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
 		2025-12-30 12:04:36 +01:00
..
ila ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
netfilter netfilter: nf_reject: don't reply to icmp error messages 2025-09-11 15:40:55 +02:00
Kconfig ipv6: sr: Use HMAC-SHA1 and HMAC-SHA256 library functions 2025-08-26 18:11:29 -07:00
Makefile net/tcp: Introduce TCP_AO setsockopt()s 2023-10-27 10:35:44 +01:00
addrconf.c ipv6: clean up routes when manually removing address with a lifetime 2025-11-14 17:44:47 -08:00
addrconf_core.c ipv6: Ensure natural alignment of const ipv6 loopback and router addresses 2024-01-30 12:43:18 +01:00
addrlabel.c net: replace ADDRLABEL with dynamic debug 2025-07-08 15:04:05 +02:00
af_inet6.c net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
ah6.c net: ipv6: fix field-spanning memcpy warning in AH output 2025-08-15 08:30:16 +02:00
anycast.c ipv6: start using dst_dev_rcu() 2025-08-29 19:36:32 -07:00
calipso.c ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() 2025-12-29 19:36:45 +01:00
datagram.c net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
esp6.c tcp: Don't pass hashinfo to socket lookup helpers. 2025-08-25 17:53:35 -07:00
esp6_offload.c xfrm: Determine inner GSO type from packet inner protocol 2025-10-30 11:52:31 +01:00
exthdrs.c ipv6: annotate data-races around devconf->rpl_seg_enabled 2025-09-02 17:01:06 -07:00
exthdrs_core.c
…
exthdrs_offload.c net: gso: add HBH extension header offload support 2024-01-05 08:11:49 -08:00
fib6_notifier.c net: do not acquire rtnl in fib_seq_sum() 2024-10-11 15:35:05 -07:00
fib6_rules.c ipv6: fib_rules: Add DSCP mask matching 2025-02-21 16:08:48 -08:00
fou6.c
…
icmp.c ipv6: icmp: Add RFC 5837 support 2025-10-29 18:28:30 -07:00
inet6_connection_sock.c ipv6: make ipv6_pinfo.daddr_cache a boolean 2025-09-18 10:17:09 +02:00
inet6_hashtables.c tcp: Remove inet6_hash(). 2025-09-22 11:38:43 -07:00
ioam6.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
ioam6_iptunnel.c ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
ip6_checksum.c
…
ip6_fib.c ipv6: clear RA flags when adding a static route 2025-11-18 19:28:08 -08:00
ip6_flowlabel.c ipv6: Move ipv6_fl_list from ipv6_pinfo to inet_sock. 2025-10-17 16:06:52 -07:00
ip6_gre.c erspan: Initialize options_len before referencing options. 2025-12-23 09:21:00 +01:00
ip6_icmp.c icmp: fix icmp_ndo_send address translation for reply direction 2025-09-01 12:54:41 -07:00
ip6_input.c net: preserve MSG_ZEROCOPY with forwarding 2025-07-02 15:07:16 -07:00
ip6_offload.c ipv6: reject malicious packets in ipv6_gso_segment() 2025-08-01 14:40:53 -07:00
ip6_offload.h
…
ip6_output.c ipv6: make ipv6_pinfo.daddr_cache a boolean 2025-09-18 10:17:09 +02:00
ip6_tunnel.c net/ip6_tunnel: Prevent perpetual tunnel growth 2025-10-13 17:43:46 -07:00
ip6_udp_tunnel.c net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
ip6_vti.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
ip6mr.c ipv6: ip6_mc_input() and ip6_mr_input() cleanups 2025-07-02 14:32:30 -07:00
ipcomp6.c xfrm: delete x->tunnel as we delete x 2025-07-08 13:28:27 +02:00
ipv6_sockglue.c net: psp: update the TCP MSS to reflect PSP packet overhead 2025-09-18 12:32:06 +02:00
mcast.c ipv6: start using dst_dev_rcu() 2025-08-29 19:36:32 -07:00
mcast_snoop.c
…
mip6.c net: fill in MODULE_DESCRIPTION()s for ipv6 modules 2024-02-09 14:12:01 -08:00
ndisc.c neighbour: Annotate access to neigh_parms fields. 2025-10-24 17:57:20 -07:00
netfilter.c netfilter: Switch to skb_dstref_steal to clear dst_entry 2025-08-19 17:54:19 -07:00
output_core.c ipv6: start using dst_dev_rcu() 2025-08-29 19:36:32 -07:00
ping.c net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
proc.c ipv6: snmp: do not track per idev ICMP6_MIB_RATELIMITHOST 2025-09-08 18:06:20 -07:00
protocol.c
…
raw.c net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
reassembly.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
route.c ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT 2025-12-30 12:04:36 +01:00
rpl.c
…
rpl_iptunnel.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-07-17 11:00:33 -07:00
seg6.c ipv6: sr: Use HMAC-SHA1 and HMAC-SHA256 library functions 2025-08-26 18:11:29 -07:00
seg6_hmac.c ipv6: sr: Prepare HMAC key ahead of time 2025-08-26 18:11:29 -07:00
seg6_iptunnel.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
seg6_local.c ipv6: adopt dst_dev() helper 2025-07-02 14:32:30 -07:00
sit.c ipv6: sit: Add ipip6_tunnel_dst_find() for cleanup 2025-09-04 10:03:59 +02:00
syncookies.c tcp: accecn: AccECN negotiation 2025-09-18 08:47:51 +02:00
sysctl_net_ipv6.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
tcp_ao.c net/tcp: Wire up l3index to TCP-AO 2023-10-27 10:35:46 +01:00
tcp_ipv6.c tcp: introduce icsk->icsk_keepalive_timer 2025-11-25 19:28:29 -08:00
tcpv6_offload.c tcp: Don't pass hashinfo to socket lookup helpers. 2025-08-25 17:53:35 -07:00
tunnel6.c net: fill in MODULE_DESCRIPTION()s for ipv6 modules 2024-02-09 14:12:01 -08:00
udp.c net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
udp_impl.h udp: move udp_memory_allocated into net_aligned_data 2025-07-02 14:22:02 -07:00
udp_offload.c net: gro: remove is_ipv6 from napi_gro_cb 2025-09-25 12:42:49 +02:00
udplite.c udp: move udp_memory_allocated into net_aligned_data 2025-07-02 14:22:02 -07:00
xfrm6_input.c xfrm: Set transport header to fix UDP GRO handling 2025-07-02 09:19:56 +02:00
xfrm6_output.c ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers 2025-07-02 14:32:30 -07:00
xfrm6_policy.c xfrm: respect ip protocols rules criteria when performing dst lookups 2024-09-23 07:02:07 +02:00
xfrm6_protocol.c
…
xfrm6_state.c
…
xfrm6_tunnel.c xfrm: flush all states in xfrm_state_fini 2025-08-06 09:23:38 +02:00