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Re: [Patch] quota: do not leak info to user-space

To: Jan Kara <jack@xxxxxxx>
Subject: Re: [Patch] quota: do not leak info to user-space
From: Cong Wang <amwang@xxxxxxxxxx>
Date: Tue, 14 May 2013 13:33:29 +0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130513101839.GE400@xxxxxxxxxxxxx>
References: <1368177873-4819-1-git-send-email-amwang@xxxxxxxxxx> <20130513100423.GD400@xxxxxxxxxxxxx> <20130513101839.GE400@xxxxxxxxxxxxx>
On Mon, 2013-05-13 at 12:18 +0200, Jan Kara wrote:
> On Mon 13-05-13 12:04:23, Jan Kara wrote:
> > On Fri 10-05-13 17:24:33, Cong Wang wrote:
> > > From: Cong Wang <amwang@xxxxxxxxxx>
> > > 
> > > There is a hole in struct fs_quota_stat, so we have to
> > > zero the struct on stack before copying it to user-space.
> > > 
> > > Cc: Jan Kara <jack@xxxxxxx>
> > > Signed-off-by: Cong Wang <amwang@xxxxxxxxxx>
> >   Good point. I've merged the patch.
>   Ah, now I've noticed that XFS (the only user of the callback you are
> fixing) is zeroing the structure on its own (xfs_qm_scall_getqstat). So
> there's no real problem. I'm somewhat wondering whether clearing the field
> in the place where you did it isn't more future-proof but usually we don't
> pass in prezeroed buffers so I've decided to leave things as they are.
> 

You are right. Thanks for looking into this!


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