linux-kernel - Re: KASAN: use-after-free Read in finish_task

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Date:   Wed, 24 Jul 2019 15:06:56 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     syzbot <syzbot+7f067c796eee2acbc57a@...kaller.appspotmail.com>,
        aarcange@...hat.com, akpm@...ux-foundation.org,
        christian@...uner.io, davem@...emloft.net, ebiederm@...ssion.com,
        elena.reshetova@...el.com, guro@...com, hch@...radead.org,
        james.bottomley@...senpartnership.com, jglisse@...hat.com,
        keescook@...omium.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-parisc@...r.kernel.org, luto@...capital.net, mhocko@...e.com,
        mingo@...nel.org, mst@...hat.com, namit@...are.com,
        peterz@...radead.org, syzkaller-bugs@...glegroups.com,
        wad@...omium.org, yuehaibing@...wei.com
Subject: Re: KASAN: use-after-free Read in finish_task_switch (2)


On 2019/7/20 上午12:34, syzbot wrote:
> syzbot has bisected this bug to:
>
> commit 7f466032dc9e5a61217f22ea34b2df932786bbfc
> Author: Jason Wang <jasowang@...hat.com>
> Date:   Fri May 24 08:12:18 2019 +0000
>
>     vhost: access vq metadata through kernel virtual address
>
> bisection log: 
> https://syzkaller.appspot.com/x/bisect.txt?x=123faf70600000
> start commit:   22051d9c Merge tag 'platform-drivers-x86-v5.3-2' of 
> git://..
> git tree:       upstream
> final crash: https://syzkaller.appspot.com/x/report.txt?x=113faf70600000
> console output: https://syzkaller.appspot.com/x/log.txt?x=163faf70600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=135cb826ac59d7fc
> dashboard link: 
> https://syzkaller.appspot.com/bug?extid=7f067c796eee2acbc57a
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c1898fa00000
>
> Reported-by: syzbot+7f067c796eee2acbc57a@...kaller.appspotmail.com
> Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual 
> address")
>
> For information about bisection process see: 
> https://goo.gl/tpsmEJ#bisection


#syz dup: WARNING in __mmdrop