linux-kernel - Re: [RFC PATCH ghak32 V2 01/13] audit: add container id

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Message-ID: <20180328123912.49b11c98@lwn.net>
Date:   Wed, 28 Mar 2018 12:39:12 -0600
From:   Jonathan Corbet <corbet@....net>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     cgroups@...r.kernel.org, containers@...ts.linux-foundation.org,
        linux-api@...r.kernel.org,
        Linux-Audit Mailing List <linux-audit@...hat.com>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, luto@...nel.org, jlayton@...hat.com,
        carlos@...hat.com, viro@...iv.linux.org.uk, dhowells@...hat.com,
        simo@...hat.com, eparis@...isplace.org, serge@...lyn.com,
        ebiederm@...ssion.com, madzcar@...il.com
Subject: Re: [RFC PATCH ghak32 V2 01/13] audit: add container id

On Fri, 16 Mar 2018 05:00:28 -0400
Richard Guy Briggs <rgb@...hat.com> wrote:

> Implement the proc fs write to set the audit container ID of a process,
> emitting an AUDIT_CONTAINER record to document the event.

A little detail, but still...

> +static int audit_set_containerid_perm(struct task_struct *task, u64 containerid)
> +{
> +	struct task_struct *parent;
> +	u64 pcontainerid, ccontainerid;
> +
> +	/* Don't allow to set our own containerid */
> +	if (current == task)
> +		return -EPERM;
> +	/* Don't allow the containerid to be unset */
> +	if (!cid_valid(containerid))
> +		return -EINVAL;

I went looking for cid_valid(), but it turns out you don't add it until
patch 5.  That, I expect, will not be good for bisectability (or patch
review).

Thanks,

jon