linux-kernel - Re: [PATCH] filesystems: use has_capability_noaudit interface for reserved blocks checks

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Message-Id: <1226676961.3353.78.camel@localhost.localdomain>
Date:	Fri, 14 Nov 2008 10:36:01 -0500
From:	Eric Paris <eparis@...hat.com>
To:	Artem Bityutskiy <dedekind@...dex.ru>
Cc:	linux-kernel@...r.kernel.org, sct@...hat.com,
	akpm@...ux-foundation.org, adilger@....com, tytso@....edu,
	linux-ext4@...r.kernel.org, dedekind@...radead.org,
	ext-adrian.hunter@...ia.com, linux-mtd@...ts.infradead.org,
	dushistov@...l.ru, jmorris@...ei.org
Subject: Re: [PATCH] filesystems: use has_capability_noaudit interface for
 reserved blocks checks

On Fri, 2008-11-14 at 09:55 +0200, Artem Bityutskiy wrote:
> Eric Paris wrote:
> > ext[2,3,4], ufs, and ubifs all check for  CAP_SYS_RESOURCE to determine
> > if they should allow reserved blocks to be used.  A process not having
> > this capability is not failing some security decision and should not be
> > audited.  Thus move to using has_capability_noaudit.
> > 
> > Signed-off-by: Eric Paris <eparis@...hat.com>
> > ---
> 
> UBIFS part looks OK, as long as the whole idea of the patch is right, which
> I have not checked, but assume it is.
> 
> The only question is are you sure exporting 'cap_capable()' is relevant
> to this patch? You do not seem to call it directly.

After this change, modules call has_capability_noaudit() which is a
#define which turns this into modules calling
security_capable_noaudit().  You noticed this and decided it was correct
to make that export.  But when CONFIG_SECURITY is not set
security_capable_notaudit() is a static inline which calls
cap_capable().  See include/linux/security.h line 2832 in the linux-next
tree.  Now modules are calling cap_capable directly, thus the export.

-Eric

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