linux-kernel - Re: [PATCH] audit: convert status version to a feature bitmap

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Date:	Thu, 13 Nov 2014 17:00:07 -0500
From:	Paul Moore <pmoore@...hat.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Richard Guy Briggs <rgb@...hat.com>, linux-audit@...hat.com,
	linux-kernel@...r.kernel.org, sgrubb@...hat.com,
	eparis@...isplace.org
Subject: Re: [PATCH] audit: convert status version to a feature bitmap

On Thursday, November 13, 2014 12:38:17 PM Joe Perches wrote:
> On Thu, 2014-11-13 at 15:29 -0500, Richard Guy Briggs wrote:
> > The version field defined in the audit status structure was found to have
> > limitations in terms of its expressibility of features supported.  This is
> > distict from the get/set features call to be able to command those
> > features
> > that are present.
> > 
> > Converting this field from a version number to a feature bitmap will allow
> > distributions to selectively backport and support certain features and
> > will
> > allow upstream to be able to deprecate features in the future.  It will
> > allow userspace clients to first query the kernel for which features are
> > actually present and supported.  Currently, EINVAL is returned rather
> > than EOPNOTSUP, which isn't helpful in determining if there was an error
> > in the command, or if it simply isn't supported yet.  Past features are
> > not represented by this bitmap, but their use may be converted to
> > EOPNOTSUP if needed in the future.
>
> Maybe use DECLARE_BITMAP instead of u32 and test_bit/set_bit

The audit_status struct is user visible and the version field is currently a 
u32 where DECLARE_BITMAP is an unsigned long.

-- 
paul moore
security and virtualization @ redhat

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