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Eric Dumazet 9d76f72325 af_unix: fix races in sk_peer_pid and sk_peer_cred accesses 
[ Upstream commit 35306eb23814444bd4021f8a1c3047d3cb0c8b2b ]

Jann Horn reported that SO_PEERCRED and SO_PEERGROUPS implementations
are racy, as af_unix can concurrently change sk_peer_pid and sk_peer_cred.

In order to fix this issue, this patch adds a new spinlock that needs
to be used whenever these fields are read or written.

Jann also pointed out that l2cap_sock_get_peer_pid_cb() is currently
reading sk->sk_peer_pid which makes no sense, as this field
is only possibly set by AF_UNIX sockets.
We will have to clean this in a separate patch.
This could be done by reverting b48596d1dc25 "Bluetooth: L2CAP: Add get_peer_pid callback"
or implementing what was truly expected.

Fixes: 109f6e39fa07 ("af_unix: Allow SO_PEERCRED to work across namespaces.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jann Horn <jannh@google.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-10-06 15:05:09 +02:00
..
9p
…
bluetooth
Bluetooth: defer cleanup of resources in hci_unregister_dev()
2021-08-15 13:03:30 +02:00
caif
net: caif: add proper error handling
2021-06-10 12:43:51 +02:00
iucv
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
netfilter
netfilter: nf_tables: fix destination register zeroing
2020-09-09 19:03:08 +02:00
netns
tcp: add tcp_min_snd_mss sysctl
2019-06-17 19:52:44 +02:00
nfc
NFC: nci: fix memory leak in nci_allocate_device
2021-06-03 08:36:11 +02:00
phonet
phonet: fix building with clang
2019-03-23 14:35:16 +01:00
sctp
sctp: move 198 addresses from unusable to private scope
2021-08-04 12:22:15 +02:00
tc_act
net/sched: don't dereference a->goto_chain to read the chain index
2019-05-04 09:15:20 +02:00
6lowpan.h
…
act_api.h
net sched: fix reporting the first-time use timestamp
2020-06-03 08:17:33 +02:00
addrconf.h
ipv6: fix memory leaks on IPV6_ADDRFORM path
2020-08-21 09:48:00 +02:00
af_ieee802154.h
…
af_rxrpc.h
rxrpc: Allow failed client calls to be retried
2017-08-29 10:55:20 +01:00
af_unix.h
net: split out functions related to registering inflight socket files
2021-08-04 12:22:14 +02:00
af_vsock.h
VSOCK: use TCP state constants for sk_state
2019-08-04 09:31:59 +02:00
ah.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
arp.h
ipv4: Define __ipv4_neigh_lookup_noref when CONFIG_INET is disabled
2019-06-11 12:21:51 +02:00
atmclip.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ax25.h
ax25: fix possible use-after-free
2019-02-23 09:06:44 +01:00
ax88796.h
…
bond_3ad.h
…
bond_alb.h
…
bond_options.h
…
bonding.h
bonding: wait for sysfs kobject destruction before freeing struct slave
2020-12-08 10:17:33 +01:00
busy_poll.h
net: annotate data race around sk_ll_usec
2021-08-04 12:22:14 +02:00
calipso.h
…
cfg80211-wext.h
…
cfg80211.h
mac80211: properly handle A-MSDUs that start with an RFC 1042 header
2021-06-03 08:36:13 +02:00
cfg802154.h
…
checksum.h
…
cipso_ipv4.h
…
cls_cgroup.h
…
codel_impl.h
…
codel_qdisc.h
…
codel.h
…
compat.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
datalink.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dcbevent.h
…
dcbnl.h
…
devlink.h
devlink: Add IPv6 header for dpipe
2017-08-31 14:42:19 -07:00
dn_dev.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dn_fib.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dn_neigh.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dn_nsp.h
…
dn_route.h
…
dn.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dsa.h
net: dsa: Allow switch drivers to indicate number of TX queues
2017-09-05 11:53:34 -07:00
dsfield.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dst_cache.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dst_metadata.h
net: validate lwtstate->data before returning from skb_tunnel_info()
2021-07-28 11:12:16 +02:00
dst_ops.h
net: add bool confirm_neigh parameter for dst_ops.update_pmtu
2020-01-04 14:00:14 +01:00
dst.h
net: Added pointer check for dst->ops->neigh_lookup in dst_neigh_lookup_skb
2020-07-22 09:22:20 +02:00
erspan.h
gre: introduce native tunnel support for ERSPAN
2017-08-22 14:29:30 -07:00
esp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ethoc.h
…
fib_notifier.h
net: Add module reference to FIB notifiers
2017-09-01 20:33:42 -07:00
fib_rules.h
fib: add missing attribute validation for tun_id
2020-03-20 10:54:10 +01:00
firewire.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
flow_dissector.h
net: sched: correct flower port blocking
2020-03-11 18:02:48 +01:00
flow.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fou.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fq_impl.h
net/flow_dissector: switch to siphash
2019-11-10 11:25:37 +01:00
fq.h
net/flow_dissector: switch to siphash
2019-11-10 11:25:37 +01:00
garp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gen_stats.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
genetlink.h
genetlink: remove genl_bind
2020-07-22 09:22:19 +02:00
geneve.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gre.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gro_cells.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gtp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
gue.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hwbm.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
icmp.h
net: icmp: pass zeroed opts from icmp{,v6}_ndo_send before sending
2021-03-03 18:22:57 +01:00
ieee80211_radiotap.h
…
ieee802154_netdev.h
…
if_inet6.h
…
ife.h
net: sched: ife: handle malformed tlv length
2018-04-29 11:33:13 +02:00
ila.h
…
inet6_connection_sock.h
…
inet6_hashtables.h
net: ipv6: add second dif to inet6 socket lookups
2017-08-07 11:39:22 -07:00
inet_common.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
inet_connection_sock.h
net: refactor bind_bucket fastreuse into helper
2020-08-21 09:48:14 +02:00
inet_ecn.h
vlan: consolidate VLAN parsing code and limit max parsing depth
2020-12-11 13:39:03 +01:00
inet_frag.h
net: IP defrag: encapsulate rbtree defrag code into callable functions
2019-04-27 09:35:40 +02:00
inet_hashtables.h
tcp/dccp: fix possible race __inet_lookup_established()
2020-01-04 14:00:19 +01:00
inet_sock.h
inet: make sure to grab rcu_read_lock before using ireq->ireq_opt
2018-10-18 09:16:21 +02:00
inet_timewait_sock.h
soreuseport: initialise timewait reuseport field
2018-05-16 10:10:24 +02:00
inetpeer.h
net: ipv4: use a dedicated counter for icmp_v4 redirect packets
2019-02-23 09:06:42 +01:00
ip6_checksum.h
…
ip6_fib.h
ipv6: fix the check before getting the cookie in rt6_get_cookie
2019-06-11 12:21:47 +02:00
ip6_route.h
net: ipv6: fix return value of ip6_skb_dst_mtu
2021-07-28 11:12:15 +02:00
ip6_tunnel.h
ip6_tunnel: allow not to count pkts on tstats by passing dev as NULL
2019-07-21 09:04:28 +02:00
ip_fib.h
net: ipv4: Fix memory leak in network namespace dismantle
2019-01-31 08:13:42 +01:00
ip_tunnels.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ip_vs.h
ipvs: allow connection reuse for unconfirmed conntrack
2020-08-21 09:48:08 +02:00
ip.h
net/ipv4: always honour route mtu during forwarding
2020-10-29 09:06:58 +01:00
ipcomp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ipconfig.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ipv6_frag.h
ip6: fix skb leak in ip6frag_expire_frag_queue()
2019-09-16 08:20:44 +02:00
ipv6.h
net: ipv6: add net argument to ip6_dst_lookup_flow
2020-05-20 08:17:02 +02:00
ipx.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
iw_handler.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kcm.h
…
l3mdev.h
ipvlan, l3mdev: fix broken l3s mode wrt local routes
2019-02-06 17:31:33 +01:00
lapb.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
lib80211.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
llc_c_ac.h
…
llc_c_ev.h
…
llc_c_st.h
…
llc_conn.h
llc: fix sk_buff leak in llc_conn_service()
2019-11-06 12:43:36 +01:00
llc_if.h
…
llc_pdu.h
net: llc: fix skb_over_panic
2021-08-04 12:22:17 +02:00
llc_s_ac.h
…
llc_s_ev.h
…
llc_s_st.h
…
llc_sap.h
…
llc.h
llc: avoid blocking in llc_sap_close()
2019-11-20 17:59:59 +01:00
lwtunnel.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mac80211.h
mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple of 4
2018-05-30 07:51:58 +02:00
mac802154.h
…
mip6.h
…
mld.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mpls_iptunnel.h
…
mpls.h
…
mrp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ncsi.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ndisc.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
neighbour.h
net: add annotations on hh->hh_len lockless accesses
2020-01-09 10:17:59 +01:00
net_namespace.h
netns: provide pure entropy for net_hash_mix()
2019-04-17 08:37:50 +02:00
net_ratelimit.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
netevent.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
netlabel.h
…
netlink.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
netprio_cgroup.h
…
netrom.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nexthop.h
net: fix rtnh_ok()
2018-05-16 10:10:23 +02:00
nl802154.h
…
nsh.h
net: add NSH header structures and helpers
2017-08-29 15:16:52 -07:00
p8022.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ping.h
…
pkt_cls.h
net_sched: introduce tcf_exts_get_net() and tcf_exts_put_net()
2017-11-09 10:03:09 +09:00
pkt_sched.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pptp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
protocol.h
IPv4: early demux can return an error code
2017-10-01 03:55:47 +01:00
psample.h
psample: Add a fwd declaration for skbuff
2021-08-26 08:37:02 -04:00
psnap.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
raw.h
net: ipv4: add second dif to raw socket lookups
2017-08-07 11:39:21 -07:00
rawv6.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
red.h
sch_red: fix off-by-one checks in red_check_params()
2021-04-16 11:57:49 +02:00
regulatory.h
regulatory: add NUL to request alpha2
2018-05-30 07:52:01 +02:00
request_sock.h
net: add {READ|WRITE}_ONCE() annotations on ->rskq_accept_head
2020-01-27 14:46:50 +01:00
rose.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
route.h
ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu
2018-05-30 07:52:14 +02:00
rtnetlink.h
can: dev: Move device back to init netns on owning netns delete
2021-03-30 14:40:12 +02:00
sch_generic.h
sch_netem: fix rcu splat in netem_enqueue()
2019-11-06 12:43:39 +01:00
scm.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
secure_seq.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
seg6_hmac.h
…
seg6.h
ipv6: sr: add support for ip4ip6 encapsulation
2017-08-25 17:10:23 -07:00
slhc_vj.h
slip: Check if rstate is initialized before uncompressing
2018-04-19 08:56:16 +02:00
smc.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
snmp.h
…
sock_reuseport.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sock.h
af_unix: fix races in sk_peer_pid and sk_peer_cred accesses
2021-10-06 15:05:09 +02:00
Space.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
stp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
strparser.h
strparser: Use delayed work instead of timer for msg timeout
2017-10-25 10:37:11 +09:00
switchdev.h
net: switchdev: Remove bridge bypass support from switchdev
2017-08-07 14:48:48 -07:00
tcp_states.h
…
tcp.h
tcp: fix TLP timer not set when CA_STATE changes from DISORDER to OPEN
2021-02-03 23:22:23 +01:00
timewait_sock.h
…
tls.h
tls: Fix TLS ulp context leak, when TLS_TX setsockopt is not used.
2018-12-05 19:41:10 +01:00
transp_v6.h
udp: fix rx queue len reported by diag and proc interface
2018-06-26 08:06:28 +08:00
tso.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tun_proto.h
vxlan: factor out VXLAN-GPE next protocol
2017-08-29 15:16:52 -07:00
udp_tunnel.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
udp.h
udp: fix rx queue len reported by diag and proc interface
2018-06-26 08:06:28 +08:00
udplite.h
udplite: fix partial checksum initialization
2018-03-08 22:41:10 -08:00
vsock_addr.h
…
vxlan.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
wext.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
wimax.h
…
x25.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
x25device.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
xfrm.h
xfrm: clone XFRMA_REPLAY_ESN_VAL in xfrm_do_migrate
2020-10-14 09:51:12 +02:00