linux-kernel - Re: [PATCH] CRED: Document the credential API's (ab)use of const pointers

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Date:	Tue, 26 Aug 2008 18:46:58 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	David Howells <dhowells@...hat.com>
cc:	akpm@...ux-foundation.org, harvey.harrison@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] CRED: Document the credential API's (ab)use of const
 pointers

On Thu, 21 Aug 2008, David Howells wrote:

> Document the credential API's (ab)use of const pointers.  Various pointers to
> credentials, such as those in the task_struct, are declared const.  The purpose
> of this is to compile-time discouragement of altering credentials through those
> pointers.  Once a set of credentials has been made public through one of these
> pointers, it may not be modified, except under special circumstances:
> 
>   (1) Its reference count may incremented and decremented.
> 
>   (2) The keyrings to which it points may be modified, but not replaced.
> 
> The only safe way to modify anything else is to create a replacement and commit
> using the functions described in Documentation/credentials.txt.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>

Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next-creds


-- 
James Morris
<jmorris@...ei.org>
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