linux-kernel - Re: [PATCH 21/43] userns: Convert sched_set_affinity and sched_set

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Date:	Wed, 18 Apr 2012 18:50:07 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	"Eric W. Beiderman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH 21/43] userns: Convert sched_set_affinity and
 sched_set_scheduler's permission checks

Quoting Eric W. Beiderman (ebiederm@...ssion.com):
> From: Eric W. Biederman <ebiederm@...ssion.com>
> 
> - Compare kuids with uid_eq
> - kuid are uniuqe across all user namespaces so there is no longer the
>   need for a user_namespace comparison.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>

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

> ---
>  kernel/sched/core.c |    7 ++-----
>  1 files changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 96bff85..b189fec 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -4042,11 +4042,8 @@ static bool check_same_owner(struct task_struct *p)
>  
>  	rcu_read_lock();
>  	pcred = __task_cred(p);
> -	if (cred->user_ns == pcred->user_ns)
> -		match = (cred->euid == pcred->euid ||
> -			 cred->euid == pcred->uid);
> -	else
> -		match = false;
> +	match = (uid_eq(cred->euid, pcred->euid) ||
> +		 uid_eq(cred->euid, pcred->uid));
>  	rcu_read_unlock();
>  	return match;
>  }
> -- 
> 1.7.2.5
> 
> --
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