linux-kernel - Re: [ 137/143] xfs: underflow bug in xfs_attrlist_by

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Date:	Tue, 13 May 2014 13:18:56 +0200
From:	Willy Tarreau <w@....eu>
To:	Luis Henriques <luis.henriques@...onical.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Ben Myers <bpm@....com>, dannf@...ian.org, jmm@...til.org
Subject: Re: [ 137/143] xfs: underflow bug in xfs_attrlist_by_handle()

Hi Luis,

On Tue, May 13, 2014 at 12:08:12PM +0100, Luis Henriques wrote:
> > diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c
> > index bad485a..782d03d 100644
> > --- a/fs/xfs/linux-2.6/xfs_ioctl32.c
> > +++ b/fs/xfs/linux-2.6/xfs_ioctl32.c
> > @@ -361,8 +361,8 @@ xfs_compat_attrlist_by_handle(
> >  	if (copy_from_user(&al_hreq, arg,
> >  			   sizeof(compat_xfs_fsop_attrlist_handlereq_t)))
> >  		return -XFS_ERROR(EFAULT);
> > -	if (al_hreq.buflen > XATTR_LIST_MAX)
> > -		return -XFS_ERROR(EINVAL);
> 
> Am I missing something or was the above return statement deleted by
> mistake?
>
> > +	if (al_hreq.buflen < sizeof(struct attrlist) ||
> > +	    al_hreq.buflen > XATTR_LIST_MAX)

Ouch! You're absolutely right, thanks a lot for spotting this!

Here's an updated patch. Dann, Moritz, you want to use this one
as well instead!

thanks,
Willy


View attachment "0001-xfs-underflow-bug-in-xfs_attrlist_by_handle.patch" of type "text/plain" (1965 bytes)