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SubjectRe: [PATCH] packet: Fix error path in packet_init
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On 2019/5/8 23:50, Eric Dumazet wrote:
> On Wed, May 8, 2019 at 8:33 AM YueHaibing <yuehaibing@huawei.com> wrote:
>>
>> kernel BUG at lib/list_debug.c:47!
>> invalid opcode: 0000 [#1
>> CPU: 0 PID: 11195 Comm: rmmod Tainted: G W 5.1.0+ #33
>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
>> RIP: 0010:__list_del_entry_valid+0x55/0x90
>> Code: 12 48 39 d7 75 39 48 8b 50 08 48 39 d7 75 1d b8 01 00 00 00 5d c3 48 89 c2 48 89 fe
>> 31 c0 48 c7 c7 40 3a fe 82 e8 74 c1 78 ff <0f> 0b 48 89 fe 31 c0 48 c7 c7 f0 3a fe 82 e8 61 c1 78 ff 0f 0b 48
>> RSP: 0018:ffffc90001b8be48 EFLAGS: 00010246
>> RAX: 000000000000004e RBX: ffffffffa0210000 RCX: 0000000000000000
>> RDX: 0000000000000000 RSI: ffff888237a16808 RDI: 00000000ffffffff
>> RBP: ffffc90001b8be48 R08: 0000000000000000 R09: 0000000000000001
>> R10: 0000000000000000 R11: ffffffff842c1640 R12: 0000000000000800
>> R13: 0000000000000000 R14: ffffc90001b8be58 R15: ffffffffa0210000
>> FS: 00007f58963c7540(0000) GS:ffff888237a00000(0000) knlGS:0000000000000000
>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 000056064c7af818 CR3: 00000001e9895000 CR4: 00000000000006f0
>> Call Trace:
>> unregister_pernet_operations+0x34/0x110
>> unregister_pernet_subsys+0x1c/0x30
>> packet_exit+0x1c/0x1dd [af_packet
>> __x64_sys_delete_module+0x16b/0x290
>> ? trace_hardirqs_off_thunk+0x1a/0x1c
>> do_syscall_64+0x6b/0x1d0
>> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>
>> Fix error handing path in packet_init to
>> avoid possilbe issue if some error occur.
>
> The trace is about rmmod, and the patch is in packet_init() ?

Sorry for confusion.

When modprobe module, register_pernet_subsys
fails and does a cleanup, ops->list is set to LIST_POISON1,
but the module init is considered to success, then while rmmod
BUG_ON is triggered in __list_del_entry_valid which is called from
unregister_pernet_subsys.

I can rework the commit log in v2.

the full CallTrace:

[ 209.641390][T12911] CPU: 0 PID: 12911 Comm: modprobe Tainted: G W 5.1.0+ #47
[ 209.642637][T12911] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
[ 209.644436][T12911] Call Trace:
[ 209.644912][T12911] dump_stack+0xa5/0xdc
[ 209.645513][T12911] should_fail+0x145/0x170
[ 209.646150][T12911] __should_failslab+0x49/0x50
[ 209.646854][T12911] should_failslab+0x9/0x14
[ 209.647500][T12911] kmem_cache_alloc+0x47/0x700
[ 209.648203][T12911] __proc_create+0xcb/0x270
[ 209.648855][T12911] proc_create_reg+0x44/0x70
[ 209.649515][T12911] proc_create_net_data+0x24/0x60
[ 209.650254][T12911] packet_net_init+0x52/0x60 [af_packet]
[ 209.651088][T12911] ops_init+0x3f/0x170
[ 209.651677][T12911] register_pernet_operations+0x109/0x1f0
[ 209.652513][T12911] ? 0xffffffffa0187000
[ 209.653116][T12911] register_pernet_subsys+0x23/0x40
[ 209.653862][T12911] packet_init+0x31/0x1000 [af_packet]
[ 209.654655][T12911] do_one_initcall+0x65/0x350
[ 209.655333][T12911] do_init_module+0x5a/0x205
[ 209.655996][T12911] load_module+0x1f07/0x2710
[ 209.656674][T12911] ? ima_post_read_file+0xec/0x130
[ 209.657417][T12911] __do_sys_finit_module+0xd1/0xf0
[ 209.658159][T12911] ? __do_sys_finit_module+0xd1/0xf0
[ 209.658924][T12911] __x64_sys_finit_module+0x15/0x20
[ 209.659683][T12911] do_syscall_64+0x6e/0x1f0
[ 209.660329][T12911] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 209.661185][T12911] RIP: 0033:0x7f6eeb066839
[ 209.661836][T12911] Code: 00 f3 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 8b 0d 1f f6 2c 00 f7 d8 64 89 01 48
[ 209.664697][T12911] RSP: 002b:00007ffe60f7c1d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 209.665913][T12911] RAX: ffffffffffffffda RBX: 0000563b7b82ab40 RCX: 00007f6eeb066839
[ 209.667071][T12911] RDX: 0000000000000000 RSI: 0000563b7aa4ac2e RDI: 0000000000000003
[ 209.668226][T12911] RBP: 0000563b7aa4ac2e R08: 0000000000000000 R09: 0000563b7b82ce80
[ 209.669388][T12911] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
[ 209.670542][T12911] R13: 0000563b7b8324a0 R14: 0000000000040000 R15: 0000563b7b82ab40
[ 209.695525][T12914] list_del corruption, ffffffffa0184000->next is LIST_POISON1 (dead000000000100)
[ 209.696916][T12914] ------------[ cut here ]------------
[ 209.697736][T12914] kernel BUG at lib/list_debug.c:47!
[ 209.698514][T12914] invalid opcode: 0000 [#1] PREEMPT SMP
[ 209.699325][T12914] CPU: 0 PID: 12914 Comm: rmmod Tainted: G W 5.1.0+ #47
[ 209.700536][T12914] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
[ 209.702391][T12914] RIP: 0010:__list_del_entry_valid+0x53/0x90
[ 209.703265][T12914] Code: 48 8b 32 48 39 fe 75 35 48 8b 50 08 48 39 f2 75 40 b8 01 00 00 00 5d c3 48 89 fe 48 89 c2 48 c7 c7 18 75 fe 82 e8 cb 34 78 ff <0f> 0b 48 89 fe 48 c7 c7 50 75 fe 82 e8 ba 34 78 ff 0f 0b 48 89 f2
[ 209.706152][T12914] RSP: 0018:ffffc90001c2fe40 EFLAGS: 00010286
[ 209.707033][T12914] RAX: 000000000000004e RBX: ffffffffa0184000 RCX: 0000000000000000
[ 209.708191][T12914] RDX: 0000000000000000 RSI: ffff888237a17788 RDI: 00000000ffffffff
[ 209.709344][T12914] RBP: ffffc90001c2fe40 R08: 0000000000000000 R09: 0000000000000000
[ 209.710505][T12914] R10: ffffc90001c2fe10 R11: 0000000000000000 R12: 0000000000000000
[ 209.711662][T12914] R13: ffffc90001c2fe50 R14: ffffffffa0184000 R15: 0000000000000000
[ 209.712815][T12914] FS: 00007f3d83634540(0000) GS:ffff888237a00000(0000) knlGS:0000000000000000
[ 209.714125][T12914] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 209.715083][T12914] CR2: 0000555c350ea818 CR3: 0000000231677000 CR4: 00000000000006f0
[ 209.716239][T12914] Call Trace:
[ 209.716718][T12914] unregister_pernet_operations+0x34/0x120
[ 209.717590][T12914] unregister_pernet_subsys+0x1c/0x30
[ 209.718377][T12914] packet_exit+0x1c/0x369 [af_packet]
[ 209.719160][T12914] __x64_sys_delete_module+0x156/0x260
[ 209.719949][T12914] ? lockdep_hardirqs_on+0x133/0x1b0
[ 209.720720][T12914] ? do_syscall_64+0x12/0x1f0
[ 209.721415][T12914] do_syscall_64+0x6e/0x1f0
[ 209.722082][T12914] entry_SYSCALL_64_after_hwframe+0x49/0xbe

>
> So I believe we need more explanations of why you believe this patch
> is fixing the issue
> the bot hit .
>
> Thanks.
>
>>
>> Reported-by: Hulk Robot <hulkci@huawei.com>
>> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
>> ---
>> net/packet/af_packet.c | 26 +++++++++++++++++++++-----
>> 1 file changed, 21 insertions(+), 5 deletions(-)
>>
>> diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
>> index 90d4e3c..3917c75 100644
>> --- a/net/packet/af_packet.c
>> +++ b/net/packet/af_packet.c
>> @@ -4598,14 +4598,30 @@ static void __exit packet_exit(void)
>>
>> static int __init packet_init(void)
>> {
>> - int rc = proto_register(&packet_proto, 0);
>> + int rc;
>>
>> - if (rc != 0)
>> + rc = proto_register(&packet_proto, 0);
>> + if (rc)
>> goto out;
>>
>> - sock_register(&packet_family_ops);
>> - register_pernet_subsys(&packet_net_ops);
>> - register_netdevice_notifier(&packet_netdev_notifier);
>> + rc = sock_register(&packet_family_ops);
>> + if (rc)
>> + goto out_proto;
>> + rc = register_pernet_subsys(&packet_net_ops);
>> + if (rc)
>> + goto out_sock;
>> + rc = register_netdevice_notifier(&packet_netdev_notifier);
>> + if (rc)
>> + goto out_pernet;
>> +
>> + return 0;
>> +
>> +out_pernet:
>> + unregister_pernet_subsys(&packet_net_ops);
>> +out_sock:
>> + sock_unregister(PF_PACKET);
>> +out_proto:
>> + proto_unregister(&packet_proto);
>> out:
>> return rc;
>> }
>> --
>> 1.8.3.1
>>
>>
>
> .
>

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