LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Frederik Deweerdt <deweerdt@free.fr>
To: "Serge E. Hallyn" <serue@us.ibm.com>
Cc: Andrew Morton <akpm@osdl.org>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -mm 8/8] user ns: implement user ns unshare
Date: Thu, 4 Jan 2007 19:07:00 +0000	[thread overview]
Message-ID: <20070104190700.GB17863@slug> (raw)
In-Reply-To: <20070104181310.GI11377@sergelap.austin.ibm.com>

On Thu, Jan 04, 2007 at 12:13:10PM -0600, Serge E. Hallyn wrote:
> From: Serge E. Hallyn <serue@us.ibm.com>
> Subject: [PATCH -mm 8/8] user ns: implement user ns unshare
> 
> Implement CLONE_NEWUSER flag useable at clone/unshare.
> 
> Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
> ---
  
>  int copy_user_ns(int flags, struct task_struct *tsk)
>  {
> -	struct user_namespace *old_ns = tsk->nsproxy->user_ns;
> +	struct user_namespace *new_ns, *old_ns = tsk->nsproxy->user_ns;
>  	int err = 0;
        ^^^^^^^^^^^^
The "= 0" is superfluous here.
>  
>  	if (!old_ns)
>  		return 0;
>  
>  	get_user_ns(old_ns);
> -	return err;
> +	if (!(flags & CLONE_NEWUSER))
> +		return 0;
> +	err = -EPERM;
> +	if (!capable(CAP_SYS_ADMIN))
> +		goto out;
> +	err = -ENOMEM;
> +	new_ns = clone_user_ns(old_ns);
> +	if (!new_ns)
> +		goto out;
> +
> +	tsk->nsproxy->user_ns = new_ns;
> +	err = 0;
> +out:
> +	put_user_ns(old_ns);
> +	return 0;
        ^^^^^^^^^
Should be "return err;"

Regards,
Frederik
>  }
>  
>  void free_user_ns(struct kref *kref)
> -- 
> 1.4.1
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

  reply	other threads:[~2007-01-04 19:08 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-04 18:06 [PATCH -mm 0/8] user ns: Introduction Serge E. Hallyn
2007-01-04 18:10 ` [PATCH -mm 1/8] nsproxy: externalizes exit_task_namespaces Serge E. Hallyn
2007-01-04 18:11 ` [PATCH -mm 2/8] user namespace: add the framework Serge E. Hallyn
2007-01-04 21:16   ` Serge E. Hallyn
2007-01-04 18:11 ` [PATCH -mm 3/8] user ns: add user_namespace ptr to vfsmount Serge E. Hallyn
2007-01-04 18:11 ` [PATCH -mm 4/8] user ns: hook permission Serge E. Hallyn
2007-01-04 18:12 ` [PATCH -mm 5/8] user ns: prepare copy_tree, copy_mnt, and their callers to handle errs Serge E. Hallyn
2007-01-04 19:00   ` Frederik Deweerdt
2007-01-04 19:35     ` Serge E. Hallyn
2007-01-04 18:12 ` [PATCH -mm 6/8] user ns: implement shared mounts Serge E. Hallyn
2007-01-04 18:12 ` [PATCH -mm 7/8] user_ns: handle file sigio Serge E. Hallyn
2007-01-12  5:20   ` Andrew Morton
2007-01-15  7:26     ` Serge E. Hallyn
2007-01-15 15:03       ` Cedric Le Goater
2007-01-15 15:28         ` Serge E. Hallyn
2007-01-15 17:35           ` Cedric Le Goater
2007-01-16 11:04             ` [PATCH -mm] user_ns: remove CONFIG_USER_NS Cedric Le Goater
2007-01-16 14:53               ` Serge E. Hallyn
2007-01-04 18:13 ` [PATCH -mm 8/8] user ns: implement user ns unshare Serge E. Hallyn
2007-01-04 19:07   ` Frederik Deweerdt [this message]
2007-01-04 19:43     ` Serge E. Hallyn
2007-01-04 22:03       ` Andrew Morton
2007-01-04 22:07         ` Andrew Morton
2007-01-04 22:23     ` Valdis.Kletnieks
2007-01-04 22:52       ` Serge E. Hallyn
2007-01-05  2:02         ` Valdis.Kletnieks
2007-01-05  4:35           ` Serge E. Hallyn
2007-01-05  4:03 ` [PATCH -mm 0/8] user ns: Introduction Andrew Morton
2007-01-05  5:43   ` Serge E. Hallyn
2007-01-05  7:00     ` Serge E. Hallyn

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20070104190700.GB17863@slug \
    --to=deweerdt@free.fr \
    --cc=akpm@osdl.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=serue@us.ibm.com \
    --subject='Re: [PATCH -mm 8/8] user ns: implement user ns unshare' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).