linux-kernel - Re: KASAN: slab-out-of-bounds Read in gfn_to

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Date:   Mon, 13 Apr 2020 20:20:12 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     syzbot <syzbot+2e0179e5185bcd5b9440@...kaller.appspotmail.com>
Cc:     christoffer.dall@....com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, maz@...nel.org, pbonzini@...hat.com,
        peterx@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: slab-out-of-bounds Read in gfn_to_memslot

On Mon, Apr 13, 2020 at 04:03:04AM -0700, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 36947254e5f981aeeedab1c7dfa35fc34d330e80
> Author: Sean Christopherson <sean.j.christopherson@...el.com>
> Date:   Tue Feb 18 21:07:32 2020 +0000
> 
>     KVM: Dynamically size memslot array based on number of used slots
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1099775de00000
> start commit:   4f8a3cc1 Merge tag 'x86-urgent-2020-04-12' of git://git.ke..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=1299775de00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1499775de00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3bfbde87e8e65624
> dashboard link: https://syzkaller.appspot.com/bug?extid=2e0179e5185bcd5b9440
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13e78c7de00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14cf613fe00000
> 
> Reported-by: syzbot+2e0179e5185bcd5b9440@...kaller.appspotmail.com
> Fixes: 36947254e5f9 ("KVM: Dynamically size memslot array based on number of used slots")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz dup: KASAN: slab-out-of-bounds Read in __kvm_gfn_to_hva_cache_init