netdev - RE: [PATCH net 1/1] tipc: fix kernel warning when sending SYN message

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Date:   Wed, 8 Feb 2023 06:56:26 +0000
From:   Tung Quang Nguyen <tung.q.nguyen@...tech.com.au>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "jmaloy@...hat.com" <jmaloy@...hat.com>,
        "ying.xue@...driver.com" <ying.xue@...driver.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "syzbot+d43608d061e8847ec9f3@...kaller.appspotmail.com" 
        <syzbot+d43608d061e8847ec9f3@...kaller.appspotmail.com>
Subject: RE: [PATCH net 1/1] tipc: fix kernel warning when sending SYN message



>-----Original Message-----
>From: Jakub Kicinski <kuba@...nel.org>
>Sent: Wednesday, February 8, 2023 12:35 PM
>To: Tung Quang Nguyen <tung.q.nguyen@...tech.com.au>
>Cc: netdev@...r.kernel.org; davem@...emloft.net; edumazet@...gle.com; pabeni@...hat.com; jmaloy@...hat.com;
>ying.xue@...driver.com; viro@...iv.linux.org.uk; syzbot+d43608d061e8847ec9f3@...kaller.appspotmail.com
>Subject: Re: [PATCH net 1/1] tipc: fix kernel warning when sending SYN message
>
>On Tue,  7 Feb 2023 01:20:46 +0000 Tung Nguyen wrote:
>> When sending a SYN message, this kernel stack trace is observed:
>>
>> ...
>> [   13.396352] RIP: 0010:_copy_from_iter+0xb4/0x550
>> ...
>> [   13.398494] Call Trace:
>> [   13.398630]  <TASK>
>> [   13.398630]  ? __alloc_skb+0xed/0x1a0
>> [   13.398630]  tipc_msg_build+0x12c/0x670 [tipc]
>> [   13.398630]  ? shmem_add_to_page_cache.isra.71+0x151/0x290
>> [   13.398630]  __tipc_sendmsg+0x2d1/0x710 [tipc]
>> [   13.398630]  ? tipc_connect+0x1d9/0x230 [tipc]
>> [   13.398630]  ? __local_bh_enable_ip+0x37/0x80
>> [   13.398630]  tipc_connect+0x1d9/0x230 [tipc]
>> [   13.398630]  ? __sys_connect+0x9f/0xd0
>> [   13.398630]  __sys_connect+0x9f/0xd0
>> [   13.398630]  ? preempt_count_add+0x4d/0xa0
>> [   13.398630]  ? fpregs_assert_state_consistent+0x22/0x50
>> [   13.398630]  __x64_sys_connect+0x16/0x20
>> [   13.398630]  do_syscall_64+0x42/0x90
>> [   13.398630]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
>>
>> It is because commit a41dad905e5a ("iov_iter: saner checks for attempt
>> to copy to/from iterator") has introduced sanity check for copying
>> from/to iov iterator. Lacking of copy direction from the iterator
>> viewpoint would lead to kernel stack trace like above.
>
>How far does the bug itself date, tho?
This issue appeared since the introduction of commit a41dad905e5a in December 2022.
>Can we get a Fixes tag?
I will add a Fixes tag in v2.
>
>> This commit fixes this issue by initializing the iov iterator with
>> the correct copy direction.