linux-kernel - Re: [PATCH 9/9] make net/core/scm.c uid comparisons user namespace aware

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Message-ID: <1318976049.2273.7.camel@Joe-Laptop>
Date:	Tue, 18 Oct 2011 15:14:09 -0700
From:	Joe Perches <joe@...ches.com>
To:	Serge Hallyn <serge@...lyn.com>
Cc:	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	akpm@...ux-foundation.org, oleg@...hat.com, richard@....at,
	mikevs@...all.net, segoon@...nwall.com, gregkh@...e.de,
	dhowells@...hat.com, eparis@...hat.com,
	"Serge E. Hallyn" <serge.hallyn@...onical.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 9/9] make net/core/scm.c uid comparisons user namespace
 aware

On Tue, 2011-10-18 at 21:54 +0000, Serge Hallyn wrote:
> From: "Serge E. Hallyn" <serge.hallyn@...onical.com>

Hi Serge.

Just some trivial style notes.

> Currently uids are compared without regard for the user namespace.
> Fix that to prevent tasks in a different user namespace from
> wrongly matching on SCM_CREDENTIALS.
[]
> diff --git a/net/core/scm.c b/net/core/scm.c

> -static __inline__ int scm_check_creds(struct ucred *creds)
> +static __inline__ bool uidequiv(const struct cred *src, struct ucred *tgt,
> +			       struct user_namespace *ns)

Perhaps inline is better than __inline__ and do these
functions really need to be marked inline at all?

> +{
> +	if (src->user_ns != ns)
> +		goto check_capable;
> +	if (src->uid == tgt->uid || src->euid == tgt->uid ||
> +	    src->suid == tgt->uid)

Perhaps this is less prone to typo errors and are a bit
more readable as:

	if (tgt->uid == src->uid ||
	    tgt->uid == src->euid ||
	    tgt->uid == src->suid)


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