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

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Date:   Wed, 27 Nov 2019 15:02:15 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+19b469021157c136116a@...kaller.appspotmail.com>
Cc:     anton@...era.com, deller@....de, jejb@...isc-linux.org,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-ntfs-dev@...ts.sourceforge.net, linux-parisc@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Will Drewry <wad@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: KASAN: use-after-free Read in ntfs_read_locked_inode

On Wed, Nov 27, 2019 at 2:20 PM syzbot
<syzbot+19b469021157c136116a@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit 910cd32e552ea09caa89cdbe328e468979b030dd
> Author: Helge Deller <deller@....de>
> Date:   Wed Mar 30 12:14:31 2016 +0000
>
>      parisc: Fix and enable seccomp filter support

FWIW this commit somehow has an effect on x86 binary. I can reproduce
it. I've collected what I know so far here:
https://github.com/google/syzkaller/issues/1271#issuecomment-559093018
Well, actually it does not look like effect of this commit but rather
non-deterministic/hermetic kernel build.
+Al for affected x86 build bullshit

> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=143090dee00000
> start commit:   3e968c9f Merge tag 'ext4_for_linus' of git://git.kernel.or..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=163090dee00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=123090dee00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7e8c053ac965e0dd
> dashboard link: https://syzkaller.appspot.com/bug?extid=19b469021157c136116a
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=142d219b800000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=143029db800000
>
> Reported-by: syzbot+19b469021157c136116a@...kaller.appspotmail.com
> Fixes: 910cd32e552e ("parisc: Fix and enable seccomp filter support")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
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