linux-kernel - Re: [PATCH v2 02/10] userns: Add per user namespace sysctls.

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Message-ID: <878twp6zd2.fsf@x220.int.ebiederm.org>
Date:	Mon, 25 Jul 2016 19:02:01 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Linux Containers <containers@...ts.linux-foundation.org>
Cc:	Kees Cook <keescook@...omium.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Seth Forshee <seth.forshee@...onical.com>,
	Nikolay Borisov <kernel@...p.com>, linux-api@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Jann Horn <jann@...jh.net>
Subject: Re: [PATCH v2 02/10] userns: Add per user namespace sysctls.

"Eric W. Biederman" <ebiederm@...ssion.com> writes:

> Limit per userns sysctls to only be opened for write by a holder
> of CAP_SYS_RESOURCE.
>
> Add all of the necessary boilerplate for having per user namespace
> sysctls.

> @@ -141,6 +215,7 @@ void free_user_ns(struct user_namespace *ns)
>  
>  	do {
>  		parent = ns->parent;
> +		retire_userns_sysctls(ns);
^^^^^^^^^^ Unfortunately it is not safe to call a sleeping function here
           so this part needs to be taken back to the drawing board.
 
           Which means this change gets has to wait for next cycle.
>  #ifdef CONFIG_PERSISTENT_KEYRINGS
>  		key_put(ns->persistent_keyring_register);
>  #endif

Eric