linux-kernel - Re: [PATCH review 22/85] ocfs2: convert between kuids and kgids and DLM locks

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Message-ID: <20130214083416.GD18408@localhost>
Date:	Thu, 14 Feb 2013 00:34:17 -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 review 22/85] ocfs2: convert between kuids and kgids and
 DLM locks

On Wed, Feb 13, 2013 at 09:51:11AM -0800, Eric W. Biederman wrote:
> From: "Eric W. Biederman" <ebiederm@...ssion.com>
> 
> Convert between uid and gids stored in the on the wire format of dlm
> locks aka struct ocfs2_meta_lvb and kuids and kgids stored in
> inode->i_uid and inode->i_gid.
> 
> Cc: Mark Fasheh <mfasheh@...e.com>
> Cc: Joel Becker <jlbec@...lplan.org>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>  fs/ocfs2/dlmglue.c |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
> index 4f7795f..f99af1c 100644
> --- a/fs/ocfs2/dlmglue.c
> +++ b/fs/ocfs2/dlmglue.c
> @@ -2045,8 +2045,8 @@ static void __ocfs2_stuff_meta_lvb(struct inode *inode)
>  	lvb->lvb_version   = OCFS2_LVB_VERSION;
>  	lvb->lvb_isize	   = cpu_to_be64(i_size_read(inode));
>  	lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
> -	lvb->lvb_iuid      = cpu_to_be32(inode->i_uid);
> -	lvb->lvb_igid      = cpu_to_be32(inode->i_gid);
> +	lvb->lvb_iuid      = cpu_to_be32(i_uid_read(inode));
> +	lvb->lvb_igid      = cpu_to_be32(i_gid_read(inode));
>  	lvb->lvb_imode     = cpu_to_be16(inode->i_mode);
>  	lvb->lvb_inlink    = cpu_to_be16(inode->i_nlink);
>  	lvb->lvb_iatime_packed  =
> @@ -2095,8 +2095,8 @@ static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
>  	else
>  		inode->i_blocks = ocfs2_inode_sector_count(inode);
>  
> -	inode->i_uid     = be32_to_cpu(lvb->lvb_iuid);
> -	inode->i_gid     = be32_to_cpu(lvb->lvb_igid);
> +	i_uid_write(inode, be32_to_cpu(lvb->lvb_iuid));
> +	i_gid_write(inode, be32_to_cpu(lvb->lvb_igid));
>  	inode->i_mode    = be16_to_cpu(lvb->lvb_imode);
>  	set_nlink(inode, be16_to_cpu(lvb->lvb_inlink));
>  	ocfs2_unpack_timespec(&inode->i_atime,

What does this do if two machines with different user namespaces
communicate.  I think that things go very wrong.  Perhaps right now,
when ocfs2 is tied to init_user_namespace, we're OK.  But as soon as two
systems can be in different namespaces, we are broken.

Joel

> -- 
> 1.7.5.4
> 

-- 

"I think it would be a good idea."  
        - Mahatma Ghandi, when asked what he thought of Western
          civilization

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