linux-kernel - Re: [PATCH -next] cred: conditionally declare groups-related functions

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Message-ID: <35e430ea-6351-464d-bd31-77f94dcba9dc@infradead.org>
Date:   Thu, 21 Jun 2018 10:11:46 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Ondrej Mosnacek <omosnace@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Paul Moore <paul@...l-moore.com>,
        Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
        linux-next@...r.kernel.org, linux-audit@...hat.com
Subject: Re: [PATCH -next] cred: conditionally declare groups-related
 functions

On 06/21/2018 01:33 AM, Ondrej Mosnacek wrote:
> The groups-related functions declared in include/linux/cred.h are
> defined in kernel/groups.c, which is compiled only when
> CONFIG_MULTIUSER=y. Move all these function declarations under #ifdef
> CONFIG_MULTIUSER to help avoid accidental usage in contexts where
> CONFIG_MULTIUSER might be disabled.
> 
> This patch also adds a fallback for groups_search(). Currently this
> function is only called from kernel/groups.c itself and
> keys/permissions.c, which depends on CONFIG_MULTIUSER. However, the
> audit subsystem (which does not depend on CONFIG_MULTIUSER) calls this
> function in -next, so the fallback will be needed to avoid compilation
> errors or ugly workarounds.
> 
> See also:
> https://lkml.org/lkml/2018/6/20/670
> https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit.git/commit/?h=next&id=af85d1772e31fed34165a1b3decef340cf4080c0
> 
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Signed-off-by: Ondrej Mosnacek <omosnace@...hat.com>

Tested-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
>  include/linux/cred.h | 16 +++++++++++-----
>  1 file changed, 11 insertions(+), 5 deletions(-)


-- 
~Randy