linux-kernel - Re: [PATCH 4.4 24/72] audit: add tty field to LOGIN event

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Date:   Thu, 17 May 2018 10:56:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Ben Hutchings <ben.hutchings@...ethink.co.uk>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Richard Guy Briggs <rgb@...hat.com>,
        Paul Moore <paul@...l-moore.com>
Subject: Re: [PATCH 4.4 24/72] audit: add tty field to LOGIN event

On Mon, May 14, 2018 at 05:18:56PM +0100, Ben Hutchings wrote:
> On Fri, 2018-04-06 at 15:23 +0200, Greg Kroah-Hartman wrote:
> > 4.4-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Richard Guy Briggs <rgb@...hat.com>
> > 
> > commit db0a6fb5d97afe01fd9c47d37c6daa82d4d4001d upstream.
> [...]
> > --- a/kernel/auditsc.c
> > +++ b/kernel/auditsc.c
> > @@ -1976,6 +1976,7 @@ static void audit_log_set_loginuid(kuid_
> >  {
> >  	struct audit_buffer *ab;
> >  	uid_t uid, oldloginuid, loginuid;
> > +	struct tty_struct *tty;
> >  
> >  	if (!audit_enabled)
> >  		return;
> > @@ -1983,14 +1984,17 @@ static void audit_log_set_loginuid(kuid_
> >  	uid = from_kuid(&init_user_ns, task_uid(current));
> >  	oldloginuid = from_kuid(&init_user_ns, koldloginuid);
> >  	loginuid = from_kuid(&init_user_ns, kloginuid),
> > +	tty = audit_get_tty(current);
> >  
> >  	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
> >  	if (!ab)
> >  		return;
> 
> This error path leaks the tty ref.  Fixed upstream by:
> 
> commit 76a658c20efd541a62838d9ff68ce94170d7a549
> Author: Richard Guy Briggs <rgb@...hat.com>
> Date:   Tue Jun 28 12:06:58 2016 -0400
> 
>     audit: move calcs after alloc and check when logging set loginuid

Thanks, now queued up.

greg k-h