linux-kernel - Re: [PATCH 3/8] cgroup: introduce cgroup namespaces

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Date:	Wed, 23 Dec 2015 11:15:26 -0500
From:	Tejun Heo <tj@...nel.org>
To:	serge.hallyn@...ntu.com
Cc:	linux-kernel@...r.kernel.org, adityakali@...gle.com,
	linux-api@...r.kernel.org, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, lxc-devel@...ts.linuxcontainers.org,
	akpm@...ux-foundation.org, ebiederm@...ssion.com,
	gregkh@...uxfoundation.org, lizefan@...wei.com, hannes@...xchg.org,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH 3/8] cgroup: introduce cgroup namespaces

Hello,

On Tue, Dec 22, 2015 at 10:23:24PM -0600, serge.hallyn@...ntu.com wrote:
...
> +char *cgroup_path(struct cgroup *cgrp, char *buf, size_t buflen)
> +{
> +	int ret;
> +	
> +	ret = cgroup_path_ns(cgrp, buf, buflen, current->nsproxy->cgroup_ns);
> +	if (ret < 0 || ret >= buflen)
> +		return NULL;
> +	return buf;
> +}
> +EXPORT_SYMBOL_GPL(cgroup_path);

Shouldn't this function check whether it's being called from a task
context?  e.g. it could be being called from an irq handler and may
end up scoping the path incorrectly.

Thanks.

-- 
tejun
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