linux-kernel - Re: [PATCH 1/3] p9auth: split core function out of some set*{u,g}id functions

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Date:	Tue, 04 May 2010 15:52:19 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	dhowells@...hat.com, lkml <linux-kernel@...r.kernel.org>,
	Ashwin Ganti <ashwin.ganti@...il.com>,
	Greg KH <greg@...ah.com>, rsc@...ch.com, ericvh@...il.com,
	linux-security-module@...r.kernel.org,
	Ron Minnich <rminnich@...il.com>, jt.beard@...il.com,
	Andrew Morgan <morgan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Eric Paris <eparis@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Kyle Moffett <kyle@...fetthome.net>,
	Steve Grubb <sgrubb@...hat.com>
Subject: Re: [PATCH 1/3] p9auth: split core function out of some set*{u,g}id functions

Serge E. Hallyn <serue@...ibm.com> wrote:

> Break the core functionality of set{fs,res}{u,g}id into cred_setX
> which performs the access checks based on current_cred(), but performs
> the requested change on a passed-in cred.
> 
> Export the helpers, since p9auth can be compiled as a module.  It
> might be worth not allowing modular p9auth to avoid having to export
> them.
> 
> Really the setfs{u,g}id helper isn't needed, but move it as
> well to keep the code consistent.
> 
> This patch also changes set_user() to use new->user->user_ns.  While
> technically not needed as all callers should have new->user->user_ns
> equal to current_userns(), it is more correct and may prevent surprises
> in the future.
> 
> Changelog:
> 	Apr 24: (David Howells) make cred_setresuid etc extern, and
> 		document the helpers in Documentation/credentials.txt.
> 
> Signed-off-by: Serge E. Hallyn <serue@...ibm.com>
Acked-by: David Howells <dhowells@...hat.com>
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