linux-kernel - Re: [PATCH 6/9] user namespaces: convert all capable checks in kernel/sys.c

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Date:	Sat, 19 Feb 2011 18:52:46 +0100
From:	Daniel Lezcano <daniel.lezcano@...e.fr>
To:	"Serge E. Hallyn" <serge@...lyn.com>
CC:	xemul@...allels.com, containers@...ts.linux-foundation.org,
	kernel list <linux-kernel@...r.kernel.org>,
	dhowells@...hat.com, LSM <linux-security-module@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Kees Cook <kees.cook@...onical.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH 6/9] user namespaces: convert all capable checks in	kernel/sys.c

On 02/17/2011 04:03 PM, Serge E. Hallyn wrote:
> This allows setuid/setgid in containers.  It also fixes some
> corner cases where kernel logic foregoes capability checks when
> uids are equivalent.  The latter will need to be done throughout
> the whole kernel.
>
> Changelog:
> 	Jan 11: Use nsown_capable() as suggested by Bastian Blank.
> 	Jan 11: Fix logic errors in uid checks pointed out by Bastian.
> 	Feb 15: allow prlimit to current (was regression in previous version)
>
> Signed-off-by: Serge E. Hallyn<serge.hallyn@...onical.com>

Acked-by: Daniel Lezcano <daniel.lezcano@...e.fr>

>
> -	if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))
> +	if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) {
> +		printk(KERN_NOTICE "%s: did not have CAP_SYS_ADMIN\n", __func__);
>   		return -EPERM;
> +	}
> +	printk(KERN_NOTICE "%s: did have CAP_SYS_ADMIN\n", __func__);

A couple of printk left here.


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