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

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Date:   Fri, 19 Jul 2019 09:34:00 -0700
From:   syzbot <syzbot+7f067c796eee2acbc57a@...kaller.appspotmail.com>
To:     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, jasowang@...hat.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)

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