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

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Date:   Tue, 7 Apr 2020 18:08:51 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     syzbot <syzbot+a65b3f8eec6b27650a25@...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 kvm_read_guest_page

On Tue, Apr 07, 2020 at 01:06:11PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    bef7b2a7 Merge tag 'devicetree-for-5.7' of git://git.kerne..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=16e40efbe00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=91b674b8f0368e69
> dashboard link: https://syzkaller.appspot.com/bug?extid=a65b3f8eec6b27650a25
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> userspace arch: i386
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14869db7e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10d2731fe00000
> 
> The bug was bisected 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=10a24a5de00000
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=12a24a5de00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14a24a5de00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+a65b3f8eec6b27650a25@...kaller.appspotmail.com
> Fixes: 36947254e5f9 ("KVM: Dynamically size memslot array based on number of used slots")

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