linux-kernel - RE: KMSAN: uninit-value in __inet6

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Date:   Fri, 14 Dec 2018 15:30:02 +0000
From:   Jon Maloy <jon.maloy@...csson.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
CC:     "syzbot+c56449ed3652e6720f30@...kaller.appspotmail.com" 
        <syzbot+c56449ed3652e6720f30@...kaller.appspotmail.com>,
        Ying Xue <ying.xue@...driver.com>,
        "tipc-discussion@...ts.sourceforge.net" 
        <tipc-discussion@...ts.sourceforge.net>,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        "Hideaki YOSHIFUJI" <yoshfuji@...ux-ipv6.org>
Subject: RE: KMSAN: uninit-value in __inet6_bind



> -----Original Message-----
> From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org>
> On Behalf Of Eric Dumazet
> Sent: 14-Dec-18 10:15
> To: Jon Maloy <jon.maloy@...csson.com>; Cong Wang
> <xiyou.wangcong@...il.com>; Dmitry Vyukov <dvyukov@...gle.com>
> Cc: syzbot+c56449ed3652e6720f30@...kaller.appspotmail.com; Ying Xue
> <ying.xue@...driver.com>; tipc-discussion@...ts.sourceforge.net; David
> Miller <davem@...emloft.net>; Alexey Kuznetsov <kuznet@....inr.ac.ru>;
> LKML <linux-kernel@...r.kernel.org>; Linux Kernel Network Developers
> <netdev@...r.kernel.org>; syzkaller-bugs@...glegroups.com; Hideaki
> YOSHIFUJI <yoshfuji@...ux-ipv6.org>
> Subject: Re: KMSAN: uninit-value in __inet6_bind
> 
> 
> 
> On 12/14/2018 07:04 AM, Jon Maloy wrote:
> >
> >
> >> -----Original Message-----
> >> From: Cong Wang <xiyou.wangcong@...il.com>
> >> Sent: 12-Dec-18 01:17
> >> To: Dmitry Vyukov <dvyukov@...gle.com>
> >> Cc: syzbot+c56449ed3652e6720f30@...kaller.appspotmail.com; Jon
> Maloy
> >> <jon.maloy@...csson.com>; Ying Xue <ying.xue@...driver.com>; tipc-
> >> discussion@...ts.sourceforge.net; David Miller <davem@...emloft.net>;
> >> Alexey Kuznetsov <kuznet@....inr.ac.ru>; LKML <linux-
> >> kernel@...r.kernel.org>; Linux Kernel Network Developers
> >> <netdev@...r.kernel.org>; syzkaller-bugs@...glegroups.com; Hideaki
> >> YOSHIFUJI <yoshfuji@...ux-ipv6.org>
> >> Subject: Re: KMSAN: uninit-value in __inet6_bind
> >>
> >> On Tue, Dec 11, 2018 at 1:04 AM Dmitry Vyukov <dvyukov@...gle.com>
> >> wrote:
> >>>
> >>> On Tue, Dec 11, 2018 at 1:41 AM syzbot
> >>> <syzbot+c56449ed3652e6720f30@...kaller.appspotmail.com> 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@...kaller.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 ?
> 
For TIPC it is ok with 0.

///jon