linux-kernel - Re: [PATCH V2 2/6] audit: log namespace serial numbers

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Message-ID: <20140513142822.GC27560@madcap2.tricolour.ca>
Date:	Tue, 13 May 2014 10:28:22 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	Eric Paris <eparis@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, arozansk@...hat.com,
	serge@...lyn.com, ebiederm@...ssion.com, sgrubb@...hat.com
Subject: Re: [PATCH V2 2/6] audit: log namespace serial numbers

On 14/05/10, Eric Paris wrote:
> On Fri, 2014-05-09 at 20:27 -0400, Richard Guy Briggs wrote:
> 
> Not so relevant because you delete all of this code later...  But
> still...
> 
> > +#ifdef CONFIG_NAMESPACES
> > +void audit_log_namespace_info(struct audit_buffer *ab, struct task_struct *tsk)
> > +{
> > +	struct nsproxy *nsproxy;
> > +
> > +	rcu_read_lock();
> 
> ok, so we are under rcu_read_lock() and cannot sleep
> 
> > +	nsproxy = task_nsproxy(tsk);
> > +	if (nsproxy != NULL) {
> > +		audit_log_format(ab, " mntns=%llx", nsproxy->mnt_ns->serial_num);
> 
> But this could do an allocation, are we sure that everything used
> GFP_ATOMIC when creating the audit buffer? [hint: it doesn't]

Ugh, missed that.  Even more reason to go with the ns_entries export.

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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