linux-kernel - Re: [PATCH v4 14/19] LSM: Infrastructure management of the inode security

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Date:   Thu, 4 Oct 2018 04:13:08 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     Kees Cook <keescook@...omium.org>
cc:     Casey Schaufler <casey@...aufler-ca.com>,
        LSM <linux-security-module@...r.kernel.org>,
        SE Linux <selinux@...ho.nsa.gov>,
        LKLM <linux-kernel@...r.kernel.org>,
        John Johansen <john.johansen@...onical.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Salvatore Mesoraca <s.mesoraca16@...il.com>
Subject: Re: [PATCH v4 14/19] LSM: Infrastructure management of the inode
 security

On Fri, 21 Sep 2018, Kees Cook wrote:

> On Fri, Sep 21, 2018 at 5:19 PM, Casey Schaufler <casey@...aufler-ca.com> wrote:

> > + * lsm_early_inode - during initialization allocate a composite inode blob
> > + * @inode: the inode that needs a blob
> > + *
> > + * Allocate the inode blob for all the modules if it's not already there
> > + */
> > +void lsm_early_inode(struct inode *inode)
> > +{
> > +       int rc;
> > +
> > +       if (inode == NULL)
> > +               panic("%s: NULL inode.\n", __func__);
> > +       if (inode->i_security != NULL)
> > +               return;
> > +       rc = lsm_inode_alloc(inode);
> > +       if (rc)
> > +               panic("%s: Early inode alloc failed.\n", __func__);
> > +}
> 
> I'm still advising against using panic(), but I'll leave it up to James.
> 

Calling panic() is not appropriate here. Perhaps if it was during 
boot-time initialization of LSM infrastructure, but not on the fly.

Use a WARN_ONCE then propagate the error back and fail the operation.


-- 
James Morris
<jmorris@...ei.org>