netdev - Re: [PATCH 1/2] net: Check the correct namespace when spoofing pid over SCM

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Message-ID: <8738pwndym.fsf@xmission.com>
Date:	Mon, 26 Aug 2013 18:02:09 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andy Lutomirski <luto@...capital.net>
Cc:	security@...nel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] net: Check the correct namespace when spoofing pid over SCM_RIGHTS

Andy Lutomirski <luto@...capital.net> writes:

> This is a security bug.
>
> The follow-up will fix nsproxy to discourage this type of issue from
> happening again.

Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>
>
> Cc: stable@...r.kernel.org
> Signed-off-by: Andy Lutomirski <luto@...capital.net>
> ---
>  net/core/scm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/core/scm.c b/net/core/scm.c
> index 03795d0..b4da80b 100644
> --- a/net/core/scm.c
> +++ b/net/core/scm.c
> @@ -54,7 +54,7 @@ static __inline__ int scm_check_creds(struct ucred *creds)
>  		return -EINVAL;
>  
>  	if ((creds->pid == task_tgid_vnr(current) ||
> -	     ns_capable(current->nsproxy->pid_ns->user_ns, CAP_SYS_ADMIN)) &&
> +	     ns_capable(task_active_pid_ns(current)->user_ns, CAP_SYS_ADMIN)) &&
>  	    ((uid_eq(uid, cred->uid)   || uid_eq(uid, cred->euid) ||
>  	      uid_eq(uid, cred->suid)) || nsown_capable(CAP_SETUID)) &&
>  	    ((gid_eq(gid, cred->gid)   || gid_eq(gid, cred->egid) ||
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