linux-kernel - Re: [PATCH] SMACK: Add missing rcu_read_lock/unlock for process capability walk.

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Message-ID: <4DAF7EAC.8010504@schaufler-ca.com>
Date:	Wed, 20 Apr 2011 17:47:40 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Andi Kleen <ak@...ux.intel.com>, jmorris@...ei.org,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH] SMACK: Add missing rcu_read_lock/unlock for process capability
 walk.

On 4/20/2011 5:08 PM, Andi Kleen wrote:
>> The global list, yes. The task specific list, no. Modifying the local
>> list is like any other modification of the cred structure and requires
>> the cred be copied.
> But you still need to free it eventually right? And that freeing will
> need RCU on the reader.

Entries are never freed from the global list. Someone is working
on a patch to do that, but is running into - wait for it - locking
issues.

Entries on the local lists are only freed when the task exits.
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