linux-kernel - Re: kernel panic: MAC Initialization failed.

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Message-ID: <CACT4Y+ZqjoXftDAby9s-YUrOv8txBFqKukRcxP6ty3LLKz_+Hw@mail.gmail.com>
Date:   Thu, 28 Feb 2019 07:51:06 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     syzbot <syzbot+e1b8084e532b6ee7afab@...kaller.appspotmail.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        James Morris <jmorris@...ei.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-security-module@...r.kernel.org,
        "Serge E. Hallyn" <serge@...lyn.com>, takedakn@...data.co.jp
Subject: Re: kernel panic: MAC Initialization failed.

On Wed, Feb 27, 2019 at 11:37 PM Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp> wrote:
>
> On 2019/02/28 2:02, syzbot wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    7b827ff9af88 Add linux-next specific files for 20190227
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=15336f14c00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=5fa6b8975759dcc5
> > dashboard link: https://syzkaller.appspot.com/bug?extid=e1b8084e532b6ee7afab
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ee708ac00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16954084c00000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+e1b8084e532b6ee7afab@...kaller.appspotmail.com
>
> Thank you. The LSM stacking seems to be working as expected.
> But this one should not be considered as a bug.
>
> If something went wrong before loading access control rules,
> it is pointless to continue. Thus, stopping with kernel panic.

Hi Tetsuo,

What misconfiguration you mean?



> If this path is trivially triggered enough to prevent testing, syzbot can
> load access control rules from /etc/tomoyo/ directory of the filesystem
> image and make tomoyo_policy_loaded = true by executing /sbin/init .
>
> Hmm, maybe we need to think about automated testing environments where
> neither built-in access control rules nor run-time access control rules
> can be provided ... ?
>
> #syz invalid
>
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