linux-kernel - Re: [PATCH v5 1/2] selinux: add brief info to policydb

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Message-ID: <1495035491.32535.6.camel@tycho.nsa.gov>
Date:   Wed, 17 May 2017 11:38:11 -0400
From:   Stephen Smalley <sds@...ho.nsa.gov>
To:     Sebastien Buisson <sbuisson.ddn@...il.com>
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov,
        serge@...lyn.com, james.l.morris@...cle.com,
        Eric Paris <eparis@...isplace.org>,
        Paul Moore <paul@...l-moore.com>,
        Sebastien Buisson <sbuisson@....com>
Subject: Re: [PATCH v5 1/2] selinux: add brief info to policydb

On Wed, 2017-05-17 at 16:59 +0200, Sebastien Buisson wrote:
> 2017-05-16 22:40 GMT+02:00 Stephen Smalley <sds@...ho.nsa.gov>:
> > > +     strcpy(*brief, policydb.policybrief);
> > > +     /* *len is the length of the output string */
> > > +     *len = policybrief_len - 1;
> > 
> > Is there a particular reason to not just return policybrief_len
> > here as
> > well, for consistency in the interface?  How do you intend to use
> > this
> > value in the caller?
> 
> As called in the other patch to expose policy brief via selinuxfs
> (sel_read_policybrief), the intent is to provide the caller with the
> length of the string returned.
> Or should I set *len to policy brief_len here, and just make the
> caller aware that the returned length is in fact the length of the
> buffer (i.e. including terminating NUL byte)?

Looking at the caller usage in the other patch, I guess it makes sense
in its current form.