linux-kernel - Re: [PATCH review 05/16] xfs: Update xfs_ioctl_setattr to handle projids in any user namespace

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Message-ID: <20130219015550.GJ26694@dastard>
Date:	Tue, 19 Feb 2013 12:55:50 +1100
From:	Dave Chinner <david@...morbit.com>
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>,
	Ben Myers <bpm@....com>, Alex Elder <elder@...nel.org>
Subject: Re: [PATCH review 05/16] xfs: Update xfs_ioctl_setattr to handle
 projids in any user namespace

On Sun, Feb 17, 2013 at 05:10:58PM -0800, Eric W. Biederman wrote:
> From: "Eric W. Biederman" <ebiederm@...ssion.com>
> 
> - Convert the userspace value in fa->fsx_projid into a kprojid and
>   store it in the variable projid.
> - Verify that xfs can store the projid after it is converted into
>   xfs's user namespace.
> - Replace uses of fa->fsx_projid with projid throughout
>   xfs_ioctl_setattr.
> 
> Cc: Ben Myers <bpm@....com>
> Cc: Alex Elder <elder@...nel.org>
> Cc: Dave Chinner <david@...morbit.com>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>  fs/xfs/xfs_ioctl.c |   26 ++++++++++++++++++--------
>  1 files changed, 18 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index 016624b..4a55f50 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -925,6 +925,7 @@ xfs_ioctl_setattr(
>  	struct xfs_dquot	*gdqp = NULL;
>  	struct xfs_dquot	*olddquot = NULL;
>  	int			code;
> +	kprojid_t		projid = INVALID_PROJID;
>  
>  	trace_xfs_ioctl_setattr(ip);
>  
> @@ -934,11 +935,20 @@ xfs_ioctl_setattr(
>  		return XFS_ERROR(EIO);
>  
>  	/*
> -	 * Disallow 32bit project ids when projid32bit feature is not enabled.
> +	 * Verify the specifid project id is valid.
>  	 */
> -	if ((mask & FSX_PROJID) && (fa->fsx_projid > (__uint16_t)-1) &&
> -			!xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb))
> -		return XFS_ERROR(EINVAL);
> +	if (mask & FSX_PROJID) {
> +		projid = make_kprojid(current_user_ns(), fa->fsx_projid);
> +		if (!projid_valid(projid))
> +			return XFS_ERROR(EINVAL);
> +
> +		/*
> +		 * Disallow 32bit project ids when projid32bit feature is not enabled.
> +		 */
> +		if ((from_kprojid(&init_user_ns, projid) > (__uint16_t)-1) &&
> +		    !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb))
> +			return XFS_ERROR(EINVAL);
> +	}

That looks busted. Why does one use current_user_ns() and the other
&init_user_ns()?

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
--
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