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From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Qian Cai <cai@lca.pw>
Cc: syzbot <syzbot+75867c44841cb6373570@syzkaller.appspotmail.com>,
	Markus.Elfring@web.de, casey@schaufler-ca.com, dancol@google.com,
	hdanton@sina.com, jmorris@namei.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	stephen.smalley.work@gmail.com, syzkaller-bugs@googlegroups.com,
	viro@zeniv.linux.org.uk, yanfei.xu@windriver.com,
	linux-next@vger.kernel.org
Subject: Re: KASAN: use-after-free Read in userfaultfd_release (2)
Date: Tue, 21 Jul 2020 14:32:33 +1000	[thread overview]
Message-ID: <20200721143233.23c89f2a@canb.auug.org.au> (raw)
In-Reply-To: <20200720155024.GC7354@lca.pw>

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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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  reply	other threads:[~2020-07-21  4:32 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-13  2:24 syzbot
2020-07-13 15:34 ` syzbot
2020-07-17 15:05   ` Qian Cai
2020-07-20 15:50     ` Qian Cai
2020-07-21  4:32       ` Stephen Rothwell [this message]
     [not found] ` <20200713084512.10416-1-hdanton@sina.com>
2020-07-20 16:00   ` Al Viro
2020-07-20 23:46     ` Daniel Colascione

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