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

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Date:   Fri, 10 Apr 2020 10:54:13 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     syzbot <syzbot+e06e0f40470ee2de4dda@...kaller.appspotmail.com>
Cc:     christoffer.dall@....com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, pbonzini@...hat.com,
        peterx@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: slab-out-of-bounds Read in gfn_to_hva

On Fri, Apr 10, 2020 at 09:39:12AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    5d30bcac Merge tag '9p-for-5.7-2' of git://github.com/mart..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17243a9fe00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=2a7f60f3313b353e
> dashboard link: https://syzkaller.appspot.com/bug?extid=e06e0f40470ee2de4dda
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12b059afe00000
> 
> The bug was bisected to:
> 
> commit 5c0b4f3d5ccc2ced94b01c3256db1cf79dc95b81
> Author: Sean Christopherson <sean.j.christopherson@...el.com>
> Date:   Tue Feb 18 21:07:26 2020 +0000
> 
>     KVM: Move memslot deletion to helper function
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13d14de7e00000
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=10314de7e00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=17d14de7e00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+e06e0f40470ee2de4dda@...kaller.appspotmail.com
> Fixes: 5c0b4f3d5ccc ("KVM: Move memslot deletion to helper function")

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