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[77.136.83.225]) by smtp.gmail.com with ESMTPSA id x76sm10670915wmd.27.2018.12.14.07.14.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 14 Dec 2018 07:14:49 -0800 (PST) Subject: Re: KMSAN: uninit-value in __inet6_bind To: Jon Maloy , Cong Wang , Dmitry Vyukov Cc: "syzbot+c56449ed3652e6720f30@syzkaller.appspotmail.com" , Ying Xue , "tipc-discussion@lists.sourceforge.net" , David Miller , Alexey Kuznetsov , LKML , Linux Kernel Network Developers , "syzkaller-bugs@googlegroups.com" , Hideaki YOSHIFUJI References: <0000000000001568af057cb456a8@google.com> From: Eric Dumazet Message-ID: <2b0f7497-7842-e9c3-c7b0-1b2bf2d5ea59@gmail.com> Date: Fri, 14 Dec 2018 07:14:46 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/14/2018 07:04 AM, Jon Maloy wrote: > > >> -----Original Message----- >> From: Cong Wang >> Sent: 12-Dec-18 01:17 >> To: Dmitry Vyukov >> Cc: syzbot+c56449ed3652e6720f30@syzkaller.appspotmail.com; Jon Maloy >> ; Ying Xue ; tipc- >> discussion@lists.sourceforge.net; David Miller ; >> Alexey Kuznetsov ; LKML > kernel@vger.kernel.org>; Linux Kernel Network Developers >> ; syzkaller-bugs@googlegroups.com; Hideaki >> YOSHIFUJI >> Subject: Re: KMSAN: uninit-value in __inet6_bind >> >> On Tue, Dec 11, 2018 at 1:04 AM Dmitry Vyukov >> wrote: >>> >>> On Tue, Dec 11, 2018 at 1:41 AM syzbot >>> wrote: >>>> >>>> Hello, >>>> >>>> syzbot found the following crash on: >>>> >>>> HEAD commit: 3f06bda61398 kmsan: remove excessive KMSAN >> wrappers from a.. >>>> git tree: https://github.com/google/kmsan.git/master >>>> console output: >>>> https://syzkaller.appspot.com/x/log.txt?x=13ca6b05400000 >>>> kernel config: >>>> https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641 >>>> dashboard link: >> https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30 >>>> compiler: clang version 8.0.0 (trunk 348261) >>>> >>>> Unfortunately, I don't have any reproducer for this crash yet. >>>> >>>> IMPORTANT: if you fix the bug, please add the following tag to the >> commit: >>>> Reported-by: syzbot+c56449ed3652e6720f30@syzkaller.appspotmail.com >>> >>> This looks like a bug in TIPC, +TIPC maintainers. >>> >> >> It looks more like udp_sock_create6() doesn't initialize >> udp6_addr.sin6_scope_id. > > Unfortunately udp_sock_create6() has no way of knowing this value, because struct udp_port_cfg is missing a field sin6_scope_id. > So this has to be fixed first by adding this field to the struct, and then setting it correctly in all current users. > Do we reasons to believe values other than 0 are needed ?