linux-kernel - RE: [RESEND][PATCH] Documentation: added order requirement for ima

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Date:   Fri, 28 Jan 2022 16:01:26 +0000
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        "Guozihua (Scott)" <guozihua@...wei.com>,
        Jonathan Corbet <corbet@....net>
CC:     "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        wangweiyang <wangweiyang2@...wei.com>,
        Xiujianfeng <xiujianfeng@...wei.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>
Subject: RE: [RESEND][PATCH] Documentation: added order requirement for
 ima_hash=

> From: Mimi Zohar [mailto:zohar@...ux.ibm.com]
> Sent: Friday, January 28, 2022 3:34 PM
> On Fri, 2022-01-28 at 10:24 +0000, Roberto Sassu wrote:
> > > From: Mimi Zohar [mailto:zohar@...ux.ibm.com]
> > > Sent: Wednesday, January 26, 2022 1:48 PM
> > > On Wed, 2022-01-26 at 15:41 +0800, Guozihua (Scott) wrote:
> > > >
> > > >
> > > > The main issue lies in ima_template_desc_current called by hash_setup,
> > > > which does not just read ima_template global variable, but also tries to
> > > > set it if that hasn't been done already. Causing ima_template_setup to quit.
> > >
> > > Right, which calls ima_init_template_list().  So part of the solution
> > > could be to conditionally call ima_init_template_list()
> > > in ima_template_setup().
> > >
> > > -       if (ima_template)
> > > -               return 1;
> > > -
> > > -       ima_init_template_list();
> > > +       if (!ima_template
> > > +               ima_init_template_list();
> >
> >
> > is it still necessary to call ima_init_template_list() in
> > template_setup()? I saw it is called in init_ima().
> 
> All of these options are at __setup().

Yes. ima_init_template_list() should be called before
lookup_template_desc().

Thanks

Roberto

HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Li Peng, Zhong Ronghua

> thanks,
> 
> Mimi