linux-kernel - Re: [REVIEW][PATCH 2/5] userns: Allow PR_CAPBSET

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Message-ID: <20130830011513.GC12720@mail.hallyn.com>
Date:	Fri, 30 Aug 2013 01:15:14 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Linux Containers <containers@...ts.linux-foundation.org>,
	"Serge E. Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org,
	Richard Weinberger <richard@....at>
Subject: Re: [REVIEW][PATCH 2/5] userns: Allow PR_CAPBSET_DROP in a user
 namespace.

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> 
> As the capabilites and capability bounding set are per user namespace
> properties it is safe to allow changing them with just CAP_SETPCAP
> permission in the user namespace.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> Tested-by: Richard Weinberger <richard@....at>

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>

> ---
>  security/commoncap.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/security/commoncap.c b/security/commoncap.c
> index c44b6fe..9fccf71 100644
> --- a/security/commoncap.c
> +++ b/security/commoncap.c
> @@ -824,7 +824,7 @@ int cap_task_setnice(struct task_struct *p, int nice)
>   */
>  static long cap_prctl_drop(struct cred *new, unsigned long cap)
>  {
> -	if (!capable(CAP_SETPCAP))
> +	if (!ns_capable(current_user_ns(), CAP_SETPCAP))
>  		return -EPERM;
>  	if (!cap_valid(cap))
>  		return -EINVAL;
> -- 
> 1.7.5.4
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