linux-kernel - Re: [patch 2/4] permission mapping for sys

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Message-Id: <20061215090843.3bff4ab9.randy.dunlap@oracle.com>
Date:	Fri, 15 Dec 2006 09:08:43 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	"Zack Weinberg" <zackw@...ix.com>
Cc:	"Stephen Smalley" <sds@...ho.nsa.gov>, jmorris@...ei.org,
	"Chris Wright" <chrisw@...s-sol.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/4] permission mapping for sys_syslog operations

On Thu, 14 Dec 2006 17:21:25 -0800 Zack Weinberg wrote:

> On 12/14/06, Randy Dunlap <randy.dunlap@...cle.com> wrote:
> > > +#define security_syslog_or_fail(type) do {           \
> > > +             int error = security_syslog(type);      \
> > > +             if (error)                              \
> > > +                     return error;                   \
> > > +     } while (0)
> > > +
> >
> > From Documentation/CodingStyle:
> >
> > Things to avoid when using macros:
> >
> > 1) macros that affect control flow: ...
> 
> It says "avoid", not "never use".  If you can think of another way to
> code this function that won't completely obscure the actual operations
> with the security checks, I will be happy to change it.

The usual answer is to just open-code it.  You may dislike that,
but hiding control flow in macros is held as really bad by
more than just me.

---
~Randy
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