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

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Message-ID: <1399737362.3558.22.camel@localhost>
Date:	Sat, 10 May 2014 11:56:02 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Richard Guy Briggs <rgb@...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 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]

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