linux-kernel - Re: KASAN: use-after-free Read in userfaultfd

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Date:   Mon, 13 Jul 2020 08:34:06 -0700
From:   syzbot <syzbot+75867c44841cb6373570@...kaller.appspotmail.com>
To:     Markus.Elfring@....de, casey@...aufler-ca.com, dancol@...gle.com,
        hdanton@...a.com, jmorris@...ei.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, stephen.smalley.work@...il.com,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: KASAN: use-after-free Read in userfaultfd_release (2)

syzbot has bisected this bug to:

commit d08ac70b1e0dc71ac2315007bcc3efb283b2eae4
Author: Daniel Colascione <dancol@...gle.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@...kaller.appspotmail.com
Fixes: d08ac70b1e0d ("Wire UFFD up to SELinux")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection