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

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Date:   Wed, 8 Feb 2023 07:48:55 +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 2:31 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"
><syzbot+d43608d061e8847ec9f3@...kaller.appspotmail.com>
>Subject: Re: [PATCH net 1/1] tipc: fix kernel warning when sending SYN message
>
>On Wed, 8 Feb 2023 06:56:26 +0000 Tung Quang Nguyen wrote:
>> >> 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.
>
>I presume that commit a41dad905e5a just added a warning to catch
>abuses. Unless this is a false positive the bug itself must have
>been introduced earlier.
Yes, since 2014. I added in v2
>
>> >Can we get a Fixes tag?
>> I will add a Fixes tag in v2.
>
>Thanks!