linux-kernel - Re: [PATCH RFC 09/12] userns: Convert ocfs2 to use kuid and kgid where appropriate

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Date:	Wed, 21 Nov 2012 11:51:15 -0800
From:	Joel Becker <jlbec@...lplan.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-fsdevel@...r.kernel.org,
	Linux Containers <containers@...ts.linux-foundation.org>,
	linux-kernel@...r.kernel.org, "Serge E. Hallyn" <serge@...lyn.com>,
	Mark Fasheh <mfasheh@...e.com>
Subject: Re: [PATCH RFC 09/12] userns: Convert ocfs2 to use kuid and kgid
 where appropriate

On Tue, Nov 20, 2012 at 04:43:37AM -0800, Eric W. Biederman wrote:
> --- a/fs/ocfs2/file.c
> +++ b/fs/ocfs2/file.c
> @@ -1116,7 +1116,8 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
>  			    (unsigned long long)OCFS2_I(inode)->ip_blkno,
>  			    dentry->d_name.len, dentry->d_name.name,
>  			    attr->ia_valid, attr->ia_mode,
> -			    attr->ia_uid, attr->ia_gid);
> +			    from_kuid(&init_user_ns, attr->ia_uid),
> +			    from_kgid(&init_user_ns, attr->ia_gid));

Dear Eric,
	I have a similar question about init_user_ns to Dave.  As far as
I can tell, using init_user_ns here means we'll never get translations
based on the current process namespace.  It just so happens that
include/linux/user_namespace.h doesn't allow new namespaces yet, but I
can't see why we would propagate that knowledge elsewhere.
	Is there some magic about when init_user_ns should be used
regardless?

Joel

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			http://www.jlbec.org/
			jlbec@...lplan.org
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