linux-kernel - Re: KASAN: use-after-free Write in tlb_finish

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Message-ID: <0000000000002c183d058e0e3abd@google.com>
Date:   Fri, 19 Jul 2019 13:04:00 -0700
From:   syzbot <syzbot+8267e9af795434ffadad@...kaller.appspotmail.com>
To:     aarcange@...hat.com, davem@...emloft.net, hch@...radead.org,
        james.bottomley@...senpartnership.com, jasowang@...hat.com,
        jglisse@...hat.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-parisc@...r.kernel.org, mst@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Write in tlb_finish_mmu

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=11642a58600000
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=13642a58600000
console output: https://syzkaller.appspot.com/x/log.txt?x=15642a58600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d831b9cbe82e79e4
dashboard link: https://syzkaller.appspot.com/bug?extid=8267e9af795434ffadad
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10d58784600000

Reported-by: syzbot+8267e9af795434ffadad@...kaller.appspotmail.com
Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual  
address")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection