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Filename Latest commit message Latest commit date
Gavrilov Ilia 6e9e0f224f drop_monitor: fix incorrect initialization order 
[ Upstream commit 07b598c0e6f06a0f254c88dafb4ad50f8a8c6eea ]

Syzkaller reports the following bug:

BUG: spinlock bad magic on CPU#1, syz-executor.0/7995
 lock: 0xffff88805303f3e0, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
CPU: 1 PID: 7995 Comm: syz-executor.0 Tainted: G            E     5.10.209+ #1
Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x119/0x179 lib/dump_stack.c:118
 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
 do_raw_spin_lock+0x1f6/0x270 kernel/locking/spinlock_debug.c:112
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
 _raw_spin_lock_irqsave+0x50/0x70 kernel/locking/spinlock.c:159
 reset_per_cpu_data+0xe6/0x240 [drop_monitor]
 net_dm_cmd_trace+0x43d/0x17a0 [drop_monitor]
 genl_family_rcv_msg_doit+0x22f/0x330 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x341/0x5a0 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x14d/0x440 net/netlink/af_netlink.c:2497
 genl_rcv+0x29/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
 netlink_unicast+0x54b/0x800 net/netlink/af_netlink.c:1348
 netlink_sendmsg+0x914/0xe00 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec net/socket.c:651 [inline]
 __sock_sendmsg+0x157/0x190 net/socket.c:663
 ____sys_sendmsg+0x712/0x870 net/socket.c:2378
 ___sys_sendmsg+0xf8/0x170 net/socket.c:2432
 __sys_sendmsg+0xea/0x1b0 net/socket.c:2461
 do_syscall_64+0x30/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x62/0xc7
RIP: 0033:0x7f3f9815aee9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3f972bf0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3f9826d050 RCX: 00007f3f9815aee9
RDX: 0000000020000000 RSI: 0000000020001300 RDI: 0000000000000007
RBP: 00007f3f981b63bd R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f3f9826d050 R15: 00007ffe01ee6768

If drop_monitor is built as a kernel module, syzkaller may have time
to send a netlink NET_DM_CMD_START message during the module loading.
This will call the net_dm_monitor_start() function that uses
a spinlock that has not yet been initialized.

To fix this, let's place resource initialization above the registration
of a generic netlink family.

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with Syzkaller.

Fixes: 9a8afc8d39 ("Network Drop Monitor: Adding drop monitor implementation & Netlink protocol")
Cc: stable@vger.kernel.org
Signed-off-by: Ilia Gavrilov <Ilia.Gavrilov@infotecs.ru>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20250213152054.2785669-1-Ilia.Gavrilov@infotecs.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-03-13 12:43:26 +01:00
..
6lowpan
9p 9p/xen: fix release of IRQ 2024-12-14 19:44:41 +01:00
802 net: 802: LLC+SNAP OID:PID lookup on start of skb data 2025-02-01 18:18:45 +01:00
8021q vlan: move dev_put into vlan_dev_uninit 2025-03-13 12:43:20 +01:00
appletalk
atm
ax25
batman-adv batman-adv: Drop unmanaged ELP metric worker 2025-03-13 12:43:24 +01:00
bluetooth Bluetooth: L2CAP: handle NULL sock pointer in l2cap_sock_alloc 2025-03-13 12:43:07 +01:00
bpf
bpfilter
bridge netfilter: Replace zero-length array with flexible-array member 2025-01-09 13:23:35 +01:00
caif
can can: j1939: j1939_sk_send_loop(): fix unable to send messages with data length zero 2025-03-13 12:43:16 +01:00
ceph libceph: fix race between delayed_work() and ceph_monc_stop() 2024-07-18 11:40:55 +02:00
core drop_monitor: fix incorrect initialization order 2025-03-13 12:43:26 +01:00
dcb
dccp net: fix data-races around sk->sk_forward_alloc 2025-02-01 18:18:52 +01:00
decnet
dns_resolver
dsa
ethernet
hsr
ieee802154 net: ieee802154: do not leave a dangling sk pointer in ieee802154_create() 2024-12-14 19:44:51 +01:00
ife
ipv4 arp: use RCU protection in arp_xmit() 2025-03-13 12:43:18 +01:00
ipv6 ndisc: extend RCU protection in ndisc_send_skb() 2025-03-13 12:43:18 +01:00
iucv s390/iucv: fix receive buffer virtual vs physical address confusion 2024-09-04 13:14:57 +02:00
kcm kcm: Serialise kcm_sendmsg() for the same socket. 2024-09-04 13:14:59 +02:00
key
l2tp genetlink: hold RCU in genlmsg_mcast() 2024-11-08 16:20:50 +01:00
l3mdev
lapb
llc net: llc: reset skb->transport_header 2025-01-09 13:23:35 +01:00
mac80211 wifi: mac80211: wake the queues in case of failure in resume 2025-01-09 13:23:35 +01:00
mac802154 mac802154: check local interfaces before deleting sdata list 2025-02-01 18:18:50 +01:00
mpls
ncsi net/ncsi: wait for the last response to Deselect Package before configuring channel 2025-03-13 12:43:11 +01:00
netfilter netfilter: Replace zero-length array with flexible-array member 2025-01-09 13:23:35 +01:00
netlabel
netlink netlink: terminate outstanding dump on socket close 2024-12-14 19:44:18 +01:00
netrom netrom: check buffer length before accessing it 2025-01-09 13:23:35 +01:00
nfc NFC: nci: Add bounds checking in nci_hci_create_pipe() 2025-03-13 12:43:11 +01:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-05-17 11:43:49 +02:00
openvswitch openvswitch: use RCU protection in ovs_vport_cmd_fill_info() 2025-03-13 12:43:18 +01:00
packet af_packet: fix vlan_get_protocol_dgram() vs MSG_PEEK 2025-01-09 13:23:35 +01:00
phonet phonet: fix rtm_phonet_notify() skb allocation 2024-05-17 11:43:54 +02:00
psample
qrtr net: qrtr: Update packets cloning when broadcasting 2024-11-08 16:20:33 +01:00
rds net:rds: Fix possible deadlock in rds_message_put 2024-09-04 13:15:03 +02:00
rfkill net: rfkill: gpio: Add check for clk_enable() 2024-12-14 19:44:27 +01:00
rose net: rose: lock the socket in rose_bind() 2025-03-13 12:43:06 +01:00
rxrpc
sched pfifo_tail_enqueue: Drop new packet when sch->limit == 0 2025-03-13 12:43:25 +01:00
sctp sctp: sysctl: rto_min/max: avoid using current->nsproxy 2025-02-01 18:18:49 +01:00
smc net/smc: check sndbuf_space again after NOSPACE flag is set in smc_poll 2025-01-09 13:23:27 +01:00
strparser
sunrpc sunrpc: suppress warnings for unused procfs functions 2025-03-13 12:43:24 +01:00
switchdev
tipc tipc: fix NULL deref in cleanup_bearer() 2024-12-19 18:05:03 +01:00
tls tls: Fix tls_sw_sendmsg error handling 2025-02-01 18:18:45 +01:00
unix af_unix: Remove put_pid()/put_cred() in copy_peercred(). 2024-09-12 11:03:52 +02:00
vmw_vsock vsock: Allow retrying on connect() failure 2025-03-13 12:43:00 +01:00
wimax
wireless genetlink: hold RCU in genlmsg_mcast() 2024-11-08 16:20:50 +01:00
x25
xdp xsk: validate user input for XDP_{UMEM|COMPLETION}_FILL_RING 2024-06-16 13:28:52 +02:00
xfrm xfrm: validate new SA's prefixlen using SA family when sel.family is unset 2024-11-08 16:20:52 +01:00
compat.c
Kconfig
Makefile
socket.c
sysctl_net.c