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Message-ID: <20250213152054.2785669-1-Ilia.Gavrilov@infotecs.ru>
Date: Thu, 13 Feb 2025 15:20:55 +0000
From: Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>
To: Neil Horman <nhorman@...driver.com>
CC: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
<pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"lvc-project@...uxtesting.org" <lvc-project@...uxtesting.org>,
"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: [PATCH net v2] drop_monitor: fix incorrect initialization order
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: 9a8afc8d3962 ("Network Drop Monitor: Adding drop monitor implementation & Netlink protocol")
Cc: stable@...r.kernel.org
Signed-off-by: Ilia Gavrilov <Ilia.Gavrilov@...otecs.ru>
---
V2:
- Move the registration of the netlink family to the end of the module initialization function
net/core/drop_monitor.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)
diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c
index 6efd4cccc9dd..212f0a048cab 100644
--- a/net/core/drop_monitor.c
+++ b/net/core/drop_monitor.c
@@ -1734,30 +1734,30 @@ static int __init init_net_drop_monitor(void)
return -ENOSPC;
}
- rc = genl_register_family(&net_drop_monitor_family);
- if (rc) {
- pr_err("Could not create drop monitor netlink family\n");
- return rc;
+ for_each_possible_cpu(cpu) {
+ net_dm_cpu_data_init(cpu);
+ net_dm_hw_cpu_data_init(cpu);
}
- WARN_ON(net_drop_monitor_family.mcgrp_offset != NET_DM_GRP_ALERT);
rc = register_netdevice_notifier(&dropmon_net_notifier);
if (rc < 0) {
pr_crit("Failed to register netdevice notifier\n");
+ return rc;
+ }
+
+ rc = genl_register_family(&net_drop_monitor_family);
+ if (rc) {
+ pr_err("Could not create drop monitor netlink family\n");
goto out_unreg;
}
+ WARN_ON(net_drop_monitor_family.mcgrp_offset != NET_DM_GRP_ALERT);
rc = 0;
- for_each_possible_cpu(cpu) {
- net_dm_cpu_data_init(cpu);
- net_dm_hw_cpu_data_init(cpu);
- }
-
goto out;
out_unreg:
- genl_unregister_family(&net_drop_monitor_family);
+ WARN_ON(unregister_netdevice_notifier(&dropmon_net_notifier));
out:
return rc;
}
@@ -1766,19 +1766,18 @@ static void exit_net_drop_monitor(void)
{
int cpu;
- BUG_ON(unregister_netdevice_notifier(&dropmon_net_notifier));
-
/*
* Because of the module_get/put we do in the trace state change path
* we are guaranteed not to have any current users when we get here
*/
+ BUG_ON(genl_unregister_family(&net_drop_monitor_family));
+
+ BUG_ON(unregister_netdevice_notifier(&dropmon_net_notifier));
for_each_possible_cpu(cpu) {
net_dm_hw_cpu_data_fini(cpu);
net_dm_cpu_data_fini(cpu);
}
-
- BUG_ON(genl_unregister_family(&net_drop_monitor_family));
}
module_init(init_net_drop_monitor);
--
2.39.5
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