linux-kernel - Re: [PATCH] selinux: init target class when add avc callback

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Date:	Tue, 6 Mar 2012 16:15:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	gaowanlong@...fujitsu.com
Cc:	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, eparis@...isplace.org,
	James Morris <jmorris@...ei.org>
Subject: Re: [PATCH] selinux: init target class when add avc callback

On Wed, 07 Mar 2012 07:59:30 +0800
Wanlong Gao <gaowanlong@...fujitsu.com> wrote:

> On 02/05/2012 09:53 AM, Wanlong Gao wrote:
> 
> > Target security class should be initialized when add avc callback.
> > Although tclass is userless in callbacks now, but it may be used
> > in the future .
> > 
> > Signed-off-by: Wanlong Gao <gaowanlong@...fujitsu.com>
> > ---
> >  security/selinux/avc.c |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> > 
> > diff --git a/security/selinux/avc.c b/security/selinux/avc.c
> > index dca1c22..27495e6 100644
> > --- a/security/selinux/avc.c
> > +++ b/security/selinux/avc.c
> > @@ -576,6 +576,7 @@ int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
> >  	c->events = events;
> >  	c->ssid = ssid;
> >  	c->tsid = tsid;
> > +	c->tclass = tclass;
> >  	c->perms = perms;
> >  	c->next = avc_callbacks;
> >  	avc_callbacks = c;

Perhaps James can take a look at this?

avc_add_callback() looks a bit odd.  It uses GFP_ATOMIC, but that is
unnecessary because avc_add_callback() is only ever called from
module_init() code.  And if it isn't only ever called from
module_init() code then it needs some locking for that list.
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