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SubjectRe: KASAN: use-after-free Read in userfaultfd_release (2)
Hi all,

On Mon, 20 Jul 2020 11:50:25 -0400 Qian Cai <cai@lca.pw> wrote:
>
> On Fri, Jul 17, 2020 at 11:05:41AM -0400, Qian Cai wrote:
> > On Mon, Jul 13, 2020 at 08:34:06AM -0700, syzbot wrote:
> > > syzbot has bisected this bug to:
> > >
> > > commit d08ac70b1e0dc71ac2315007bcc3efb283b2eae4
> > > Author: Daniel Colascione <dancol@google.com>
> > > Date: Wed Apr 1 21:39:03 2020 +0000
> > >
> > > Wire UFFD up to SELinux
> > >
> > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14a79d13100000
> > > start commit: 89032636 Add linux-next specific files for 20200708
> > > git tree: linux-next
> > > final crash: https://syzkaller.appspot.com/x/report.txt?x=16a79d13100000
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=12a79d13100000
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=64a250ebabc6c320
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=75867c44841cb6373570
> > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c4c8db100000
> > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12cbb68f100000
> > >
> > > Reported-by: syzbot+75867c44841cb6373570@syzkaller.appspotmail.com
> > > Fixes: d08ac70b1e0d ("Wire UFFD up to SELinux")
> > >
> > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> >
> > This is rather easy to reproduce here,
>
> James, Stephen, can you drop this patch? Daniel's email was bounced, and Viro
> mentioned the patch could be quite bad,
>
> https://lore.kernel.org/lkml/20200719165746.GJ2786714@ZenIV.linux.org.uk/

I have reverted that commit in linux-next today.

--
Cheers,
Stephen Rothwell
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