linux-kernel - Re: WARNING: refcount bug in find_key_to

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Message-ID: <CACT4Y+ZZ2tmUg9PAKouK5zhNw=BDWD7+jfo_JjB92Eb+g_gAQQ@mail.gmail.com>
Date:   Mon, 21 Oct 2019 18:05:41 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     David Howells <dhowells@...hat.com>
Cc:     syzbot <syzbot+6455648abc28dbdd1e7f@...kaller.appspotmail.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        James Morris <jmorris@...ei.org>, keyrings@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING: refcount bug in find_key_to_update

On Mon, Oct 21, 2019 at 5:59 PM David Howells <dhowells@...hat.com> wrote:
>
> syzbot <syzbot+6455648abc28dbdd1e7f@...kaller.appspotmail.com> wrote:
>
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11c8adab600000
>
> How do I tell what's been passed into the add_key for the encrypted key?

Hi David,

The easiest and most reliable would be to run it and dump the data in
the kernel function.