linux-kernel - Re: [PATCH] ima: Rename internal audit rule functions

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Message-ID: <20200710194234.GA7254@sequoia>
Date:   Fri, 10 Jul 2020 14:42:34 -0500
From:   Tyler Hicks <tyhicks@...ux.microsoft.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>
Cc:     Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Casey Schaufler <casey@...aufler-ca.com>,
        linux-audit@...hat.com
Subject: Re: [PATCH] ima: Rename internal audit rule functions

On 2020-06-29 17:30:03, Mimi Zohar wrote:
> [Cc'ing the audit mailing list]
> 
> On Mon, 2020-06-29 at 10:30 -0500, Tyler Hicks wrote:
> > 
> > diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
> > index ff2bf57ff0c7..5d62ee8319f4 100644
> > --- a/security/integrity/ima/ima.h
> > +++ b/security/integrity/ima/ima.h
> > @@ -419,24 +419,24 @@ static inline void ima_free_modsig(struct modsig *modsig)
> >  /* LSM based policy rules require audit */
> >  #ifdef CONFIG_IMA_LSM_RULES
> >  
> > -#define security_filter_rule_init security_audit_rule_init
> > -#define security_filter_rule_free security_audit_rule_free
> > -#define security_filter_rule_match security_audit_rule_match
> > +#define ima_audit_rule_init security_audit_rule_init
> > +#define ima_audit_rule_free security_audit_rule_free
> > +#define ima_audit_rule_match security_audit_rule_match
> 
> Instead of defining an entirely new method of identifying files, IMA
> piggybacks on top of the existing audit rule syntax.  IMA policy rules
> "filter" based on this information.
> 
> IMA already audits security/integrity related events.  Using the word
> "audit" here will make things even more confusing than they currently
> are.  Renaming these functions as ima_audit_rule_XXX provides no
> benefit.  At that point, IMA might as well call the
> security_audit_rule prefixed function names directly.  As a quick fix,
> rename them as "ima_filter_rule".
> 
> The correct solution would probably be to rename these prefixed
> "security_audit_rule" functions as "security_filter_rule", so that
> both the audit subsystem and IMA could use them.

There doesn't seem to be any interest, from the audit side, in re-using
these. I don't quite understand why they would want to use them since
they're just simple wrappers around the security_audit_rule_*()
functions.

I'll go the "quick fix" route of renaming them as ima_filter_rule_*().

Tyler

> 
> Mimi