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Eric Dumazet 35306eb238 af_unix: fix races in sk_peer_pid and sk_peer_cred accesses 
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>
2021-09-30 14:18:40 +01:00
..
9p
9p: apply review requests for fid refcounting
2020-11-19 17:21:34 +01:00
bluetooth
Bluetooth: Store advertising handle so it can be re-enabled
2021-08-16 17:53:48 +02:00
caif
net: remove the caif_hsi driver
2021-07-01 13:19:48 -07:00
iucv
net/af_iucv: don't track individual TX skbs for TRANS_HIPER sockets
2021-01-28 20:36:21 -08:00
netfilter
netfilter: add netfilter hooks to SRv6 data plane
2021-08-30 01:51:36 +02:00
netns
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
2021-08-30 10:57:54 +01:00
nfc
nfc: hci: pass callback data param as pointer in nci_request()
2021-08-02 15:11:37 +01:00
phonet
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 336
2019-06-05 17:37:07 +02:00
sctp
sctp: send pmtu probe only if packet loss in Search Complete state
2021-07-25 23:06:02 +01:00
tc_act
net/sched: act_vlan: Fix modify to allow 0
2021-06-01 16:54:42 -07:00
6lowpan.h
6lowpan: Replace zero-length array with flexible-array member
2020-02-28 14:51:30 +01:00
act_api.h
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
addrconf.h
net: bridge: mcast: fix broken length + header check for MRDv6 Adv.
2021-04-27 14:02:06 -07:00
af_ieee802154.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
2019-05-30 11:26:41 -07:00
af_rxrpc.h
afs: Don't truncate iter during data fetch
2021-04-23 10:17:26 +01:00
af_unix.h
af_unix: Add unix_stream_proto for sockmap
2021-08-16 18:43:39 -07:00
af_vsock.h
af_vsock: rest of SEQPACKET support
2021-06-11 13:32:46 -07:00
ah.h
…
arp.h
net: avoid potential false sharing in neighbor related code
2019-11-06 16:14:48 -08:00
atmclip.h
…
ax25.h
ax25: fix possible use-after-free
2019-01-23 11:18:00 -08:00
ax88796.h
ax88796: export ax_NS8390_init() hook
2021-08-03 13:05:25 +01:00
bareudp.h
bareudp: Reverted support to enable & disable rx metadata collection
2020-07-21 18:30:47 -07:00
bond_3ad.h
bonding: add new option lacp_active
2021-08-03 11:50:22 +01:00
bond_alb.h
bonding/alb: Add helper functions to get the xmit slave
2020-05-01 12:15:37 -07:00
bond_options.h
bonding: add new option lacp_active
2021-08-03 11:50:22 +01:00
bonding.h
bonding: remove extraneous definitions from bonding.h
2021-08-11 14:57:31 -07:00
bpf_sk_storage.h
bpf: struct sock is declared twice in bpf_sk_storage header
2021-03-26 17:43:55 +01:00
busy_poll.h
net: annotate data race around sk_ll_usec
2021-07-01 11:23:50 -07:00
calipso.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13
2019-05-21 11:28:45 +02:00
cfg80211-wext.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
cfg80211.h
nl80211: add support for BSS coloring
2021-08-17 11:58:21 +02:00
cfg802154.h
cfg802154: Replace zero-length array with flexible-array member
2020-02-29 14:39:08 +01:00
checksum.h
csum_and_copy_to_iter(): massage into form closer to csum_and_copy_from_iter()
2021-06-10 11:45:14 -04:00
cipso_ipv4.h
cipso: Remove unused inline functions
2020-07-15 07:45:24 -07:00
cls_cgroup.h
bpf: Allow to retrieve cgroup v1 classid from v2 hooks
2020-03-27 19:40:38 -07:00
codel_impl.h
…
codel_qdisc.h
…
codel.h
…
compat.h
net/ipv4/ipv6: Replace one-element arraya with flexible-array members
2021-08-05 11:46:42 +01:00
datalink.h
…
dcbevent.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201
2019-05-30 11:29:52 -07:00
dcbnl.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201
2019-05-30 11:29:52 -07:00
devlink.h
devlink: Use xarray to store devlink instances
2021-08-14 13:59:10 +01:00
dn_dev.h
…
dn_fib.h
net: convert fib_treeref from int to refcount_t
2021-07-30 15:33:24 +02:00
dn_neigh.h
…
dn_nsp.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 24
2019-05-21 11:52:39 +02:00
dn_route.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 24
2019-05-21 11:52:39 +02:00
dn.h
…
dsa.h
net: dsa: tear down devlink port regions when tearing down the devlink port on error
2021-09-19 13:05:44 +01:00
dsfield.h
ipv6: Annotate bitwise IPv6 dsfield pointer cast
2019-12-16 16:09:44 -08:00
dst_cache.h
…
dst_metadata.h
net: validate lwtstate->data before returning from skb_tunnel_info()
2021-07-09 13:55:53 -07:00
dst_ops.h
net/dst: use a smaller percpu_counter batch for dst entries accounting
2020-05-08 21:33:33 -07:00
dst.h
sk_buff: track dst status in slow_gro
2021-07-29 12:18:11 +01:00
erspan.h
erspan: Add type I version 0 support.
2020-05-05 13:23:29 -07:00
esp.h
ESP: Export esp_output_fill_trailer function
2020-02-19 13:52:32 +01:00
espintcp.h
xfrm: espintcp: save and call old ->sk_destruct
2020-04-20 07:34:16 +02:00
ethoc.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
failover.h
…
fib_notifier.h
ipv6: Remove old route notifications and convert listeners
2019-12-24 22:37:30 -08:00
fib_rules.h
fib: use indirect call wrappers in the most common fib_rules_ops
2020-07-28 17:42:31 -07:00
firewire.h
…
flow_dissector.h
flow_dissector: constify raw input data argument
2021-03-14 14:46:32 -07:00
flow_offload.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-08-19 18:09:18 -07:00
flow.h
flow: fix object-size-mismatch warning in flowi{4,6}_to_flowi_common()
2021-09-02 11:44:19 +01:00
fou.h
…
fq_impl.h
net/fq_impl: do not maintain a backlog-sorted list of flows
2021-01-21 13:33:45 +01:00
fq.h
net/fq_impl: do not maintain a backlog-sorted list of flows
2021-01-21 13:33:45 +01:00
garp.h
treewide: Use sizeof_field() macro
2019-12-09 10:36:44 -08:00
gen_stats.h
net_sched: extend packet counter to 64bit
2019-11-05 18:20:55 -08:00
genetlink.h
mptcp: avoid lock_fast usage in accept path
2021-02-12 16:31:46 -08:00
geneve.h
net: Move the definition of the default Geneve udp port to public header file
2019-03-22 12:09:31 -07:00
gre.h
ip_gre: add csum offload support for gre header
2021-01-29 20:39:14 -08:00
gro_cells.h
…
gro.h
gro: add combined call_gro_receive() + INDIRECT_CALL_INET() helper
2021-03-18 19:51:12 -07:00
gtp.h
…
gue.h
GUE: Fix a typo
2020-06-22 21:12:44 -07:00
hwbm.h
net: hwbm: if CONFIG_NET_HWBM unset, make stub functions static
2019-10-25 16:24:32 -07:00
icmp.h
ipv6: ICMPV6: add response to ICMPV6 RFC 8335 PROBE messages
2021-06-28 14:29:45 -07:00
ieee80211_radiotap.h
mac80211: Use flex-array for radiotap header bitmap
2021-08-13 09:58:25 +02:00
ieee802154_netdev.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
2019-05-30 11:26:41 -07:00
if_inet6.h
ipv6: add IFLA_INET6_RA_MTU to expose mtu value
2021-08-27 17:29:18 -07:00
ife.h
net: ife: drop include of module.h from net/ife.h
2019-04-22 21:50:53 -07:00
ila.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
inet6_connection_sock.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
inet6_hashtables.h
net: Track socket refcounts in skb_steal_sock()
2020-03-30 13:45:04 -07:00
inet_common.h
bpf: Allow rewriting to ports under ip_unprivileged_port_start
2021-01-27 18:18:15 -08:00
inet_connection_sock.h
tcp: change ICSK_CA_PRIV_SIZE definition
2021-06-29 11:54:36 -07:00
inet_ecn.h
inet_ecn: Use csum16_add() helper for IP_ECN_set_* helpers
2020-12-14 18:38:58 -08:00
inet_frag.h
inet: frags: batch fqdir destroy works
2020-12-12 15:08:54 -08:00
inet_hashtables.h
tcp: seq_file: Replace listening_hash with lhash2
2021-07-23 16:44:57 -07:00
inet_sock.h
inet: remove inet_sk_copy_descendant()
2020-08-26 07:33:19 -07:00
inet_timewait_sock.h
tcp: honor SO_PRIORITY in TIME_WAIT state
2019-09-27 12:05:02 +02:00
inetpeer.h
net: ipv4: use a dedicated counter for icmp_v4 redirect packets
2019-02-08 21:50:15 -08:00
ioam6.h
ipv6: ioam: Support for IOAM injection with lwtunnels
2021-07-21 08:14:33 -07:00
ip6_checksum.h
tcp: remove indirect calls for icsk->icsk_af_ops->send_check
2020-06-20 17:47:53 -07:00
ip6_fib.h
ipv6: correct comments about fib6_node sernum
2021-08-24 09:59:01 +01:00
ip6_route.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-08-05 15:08:47 -07:00
ip6_tunnel.h
ip6_tunnel: allow not to count pkts on tstats by passing dev as NULL
2019-06-18 20:48:45 -04:00
ip_fib.h
net: ipv4: Fix rtnexthop len when RTA_FLOW is present
2021-09-24 14:07:10 +01:00
ip_tunnels.h
ip_tunnel: use ndo_siocdevprivate
2021-07-27 20:11:44 +01:00
ip_vs.h
netfilter: move handlers to net/ip_vs.h
2021-02-04 18:37:57 -08:00
ip.h
net: ipv4: Consolidate ipv4_mtu and ip_dst_mtu_maybe_forward
2021-07-21 08:22:03 -07:00
ipcomp.h
…
ipconfig.h
…
ipv6_frag.h
ipv6: Remove dependency of ipv6_frag_thdr_truncated on ipv6 module
2020-11-19 10:49:50 -08:00
ipv6_stubs.h
ipv6: add ipv6_dev_find to stubs
2021-03-30 13:29:39 -07:00
ipv6.h
ipv6: Add a sysctl to control multipath hash fields
2021-05-18 13:27:32 -07:00
iw_handler.h
…
kcm.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
l3mdev.h
l3mdev: add infrastructure for table to VRF mapping
2020-06-20 17:22:22 -07:00
lag.h
…
lapb.h
net: lapb: Make "lapb_t1timer_running" able to detect an already running timer
2021-03-23 14:14:50 -07:00
lib80211.h
…
llc_c_ac.h
…
llc_c_ev.h
…
llc_c_st.h
…
llc_conn.h
llc: fix sk_buff leak in llc_conn_service()
2019-10-08 13:23:05 -07:00
llc_if.h
…
llc_pdu.h
net: llc: fix skb_over_panic
2021-07-27 13:05:56 +01:00
llc_s_ac.h
…
llc_s_ev.h
…
llc_s_st.h
…
llc_sap.h
…
llc.h
llc: avoid blocking in llc_sap_close()
2018-09-13 09:04:58 -07:00
lwtunnel.h
netfilter: add netfilter hooks to SRv6 data plane
2021-08-30 01:51:36 +02:00
mac80211.h
mac80211: Fix Ptk0 rekey documentation
2021-09-27 12:02:54 +02:00
mac802154.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
2019-05-30 11:26:41 -07:00
macsec.h
net: macsec: fix the length used to copy the key for offloading
2021-06-24 12:41:12 -07:00
mctp.h
mctp: Specify route types, require rtm_type in RTM_*ROUTE messages
2021-08-11 16:01:17 -07:00
mctpdevice.h
mctp: Remove the repeated declaration
2021-08-25 11:23:14 +01:00
mip6.h
net: mip6: Replace zero-length array with flexible-array member
2020-03-02 11:16:27 -08:00
mld.h
mld: add new workqueues for process mld events
2021-03-26 15:14:56 -07:00
mpls_iptunnel.h
net: mpls: Replace zero-length array with flexible-array member
2020-02-28 12:08:37 -08:00
mpls.h
net: Make mpls_entry_encode() available for generic users
2020-05-29 21:20:20 -07:00
mptcp.h
mptcp: MP_FAIL suboption sending
2021-08-25 11:02:34 +01:00
mrp.h
treewide: Use sizeof_field() macro
2019-12-09 10:36:44 -08:00
ncsi.h
…
ndisc.h
ipv6: ndisc: adjust ndisc_ifinfo_sysctl_change prototype
2020-08-24 06:40:07 -07:00
neighbour.h
net: Exempt multicast addresses from five-second neighbor lifetime
2020-11-13 14:24:39 -08:00
net_failover.h
…
net_namespace.h
netfilter: remove xt pernet data
2021-08-01 12:00:51 +02:00
net_ratelimit.h
…
netevent.h
net: ipv4: Notify about changes to ip_forward_update_priority
2018-08-01 09:52:30 -07:00
netlabel.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13
2019-05-21 11:28:45 +02:00
netlink.h
net: netlink: add the case when nlh is NULL
2021-07-27 11:43:50 +01:00
netprio_cgroup.h
netprio: use css ID instead of cgroup ID
2019-11-12 08:18:03 -08:00
netrom.h
net: netrom: Fix error cleanup path of nr_proto_init
2019-04-11 13:59:49 -07:00
nexthop.h
net: ipv4: Fix rtnexthop len when RTA_FLOW is present
2021-09-24 14:07:10 +01:00
nl802154.h
…
nsh.h
…
p8022.h
…
page_pool.h
page_pool: add frag page recycling support in page pool
2021-08-09 15:49:00 -07:00
pie.h
pie: realign comment
2020-03-04 13:25:55 -08:00
ping.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
pkt_cls.h
sch_htb: Fix inconsistency when leaf qdisc creation fails
2021-08-30 16:33:59 -07:00
pkt_sched.h
net: prevent user from passing illegal stab size
2021-09-26 11:09:07 +01:00
pptp.h
…
protocol.h
net: Remove the member netns_ok
2021-05-17 15:29:35 -07:00
psample.h
psample: Add a fwd declaration for skbuff
2021-08-09 15:34:21 -07:00
psnap.h
…
raw.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
rawv6.h
…
red.h
sch_red: fix off-by-one checks in red_check_params()
2021-03-25 17:40:43 -07:00
regulatory.h
net/wireless: regulatory.h: drop duplicate word in comment
2020-07-31 09:24:23 +02:00
request_sock.h
tcp: bpf: Optionally store mac header in TCP_SAVE_SYN
2020-08-24 14:35:00 -07:00
rose.h
…
route.h
lsm,selinux: pass flowi_common instead of flowi to the LSM hooks
2020-11-23 18:36:21 -05:00
rpl.h
net: ipv6: Use struct_size() helper and kcalloc()
2020-06-23 20:27:09 -07:00
rsi_91x.h
…
rtnetlink.h
net: add extack arg for link ops
2021-08-04 10:01:26 +01:00
rtnh.h
net: Rename net/nexthop.h net/rtnh.h
2019-04-22 21:47:25 -07:00
sch_generic.h
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
scm.h
fs: Move __scm_install_fd() to __receive_fd()
2020-07-13 11:03:44 -07:00
secure_seq.h
…
seg6_hmac.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
seg6_local.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
seg6.h
seg6: fix seg6_validate_srh() to avoid slab-out-of-bounds
2020-06-04 15:39:32 -07:00
selftests.h
net: selftest: fix build issue if INET is disabled
2021-04-28 14:06:45 -07:00
slhc_vj.h
…
smc.h
net/smc: introduce CHID callback for ISM devices
2020-09-28 15:19:03 -07:00
snmp.h
net/tls: add skeleton of MIB statistics
2019-10-05 16:29:00 -07:00
sock_reuseport.h
tcp: Add reuseport_migrate_sock() to select a new listener.
2021-06-15 18:01:05 +02:00
sock.h
af_unix: fix races in sk_peer_pid and sk_peer_cred accesses
2021-09-30 14:18:40 +01:00
Space.h
wan: remove sbni/granch driver
2021-08-03 13:05:26 +01:00
stp.h
…
strparser.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
switchdev.h
net: make switchdev_bridge_port_{,unoffload} loosely coupled with the bridge
2021-08-04 12:35:07 +01:00
tcp_states.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
tcp.h
Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2021-07-31 11:23:26 -07:00
timewait_sock.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
tipc.h
…
tls_toe.h
net/tls: rename tls_hw_* functions tls_toe_*
2019-10-04 14:07:07 -07:00
tls.h
net: sock: introduce sk_error_report
2021-06-29 11:28:21 -07:00
transp_v6.h
tcp: move ipv4_specific to tcp include file
2020-06-23 20:10:15 -07:00
tso.h
net: tso: cache transport header length
2020-06-18 20:46:23 -07:00
tun_proto.h
…
udp_tunnel.h
udp: call udp_encap_enable for v6 sockets when enabling encap
2021-02-04 18:37:14 -08:00
udp.h
skmsg: Pass psock pointer to ->psock_update_sk_prot()
2021-04-12 17:34:27 +02:00
udplite.h
…
vsock_addr.h
vsock: remove include/linux/vm_sockets.h file
2019-11-14 18:12:17 -08:00
vxlan.h
net: sched: only keep the available bits when setting vxlan md->gbp
2020-09-14 16:49:39 -07:00
wext.h
…
x25.h
net/x25: add new state X25_STATE_5
2019-12-09 10:28:43 -08:00
x25device.h
…
xdp_priv.h
page_pool: do not release pool until inflight == 0.
2019-11-16 12:39:10 -08:00
xdp_sock_drv.h
xsk: Introduce batched Tx descriptor interfaces
2020-11-17 22:07:40 +01:00
xdp_sock.h
xdp: Add proper __rcu annotations to redirect map entries
2021-06-24 19:41:15 +02:00
xdp.h
bpf: Add function for XDP meta data length check
2021-07-07 19:51:12 -07:00
xfrm.h
xfrm: Add possibility to set the default to block if we have no policy
2021-07-21 09:49:19 +02:00
xsk_buff_pool.h
xsk: Fix missing validation for skb and unaligned mode
2021-06-18 16:57:19 +02:00