linux-kernel - Re: [syzbot] [kvm?] KASAN: slab-use-after-free Write in kvm_gmem

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Message-ID: <aP-Eq4NFAhIscvIf@google.com>
Date: Mon, 27 Oct 2025 07:41:47 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Hillf Danton <hdanton@...a.com>
Cc: syzbot <syzbot+2479e53d0db9b32ae2aa@...kaller.appspotmail.com>, 
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, tabba@...gle.com, xiaoyao.li@...el.com
Subject: Re: [syzbot] [kvm?] KASAN: slab-use-after-free Write in kvm_gmem_release

On Sat, Oct 25, 2025, Hillf Danton wrote:
> On Thu, Oct 23, 2025, syzbot wrote:
> > syzbot has bisected this issue to:
> > 
> > commit d1e54dd08f163a9021433020d16a8f8f70ddc41c
> > Author: Fuad Tabba <tabba@...gle.com>
> > Date:   Tue Jul 29 22:54:40 2025 +0000
> > 
> >     KVM: x86: Enable KVM_GUEST_MEMFD for all 64-bit builds
> > 
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12a663cd980000
> > start commit:   43e9ad0c55a3 Merge tag 'scsi-fixes' of git://git.kernel.or..
> > git tree:       upstream
> > final oops:     https://syzkaller.appspot.com/x/report.txt?x=11a663cd980000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=16a663cd980000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=67b63a24f3c26fca
> > dashboard link: https://syzkaller.appspot.com/bug?extid=2479e53d0db9b32ae2aa
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=173ecd2f980000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14bc2be2580000
> 
> Test Sean's fix.
> 
> #syz test linux-next master 

Oh, nice.  Thanks Hillf!