linux-kernel - Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat

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Date:   Thu, 15 Aug 2019 00:13:14 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Dave Chinner <david@...morbit.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Brian Foster <bfoster@...hat.com>,
        Allison Collins <allison.henderson@...cle.com>,
        Nick Bowler <nbowler@...conx.ca>,
        Eric Sandeen <sandeen@...deen.net>,
        Dave Chinner <dchinner@...hat.com>
Subject: Re: [PATCH v5 01/18] xfs: compat_ioctl: use compat_ptr()

On Thu, Aug 15, 2019 at 07:37:53AM +1000, Dave Chinner wrote:
> > @@ -576,7 +576,7 @@ xfs_file_compat_ioctl(
> >  	case XFS_IOC_SCRUB_METADATA:
> >  	case XFS_IOC_BULKSTAT:
> >  	case XFS_IOC_INUMBERS:
> > -		return xfs_file_ioctl(filp, cmd, p);
> > +		return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
> 
> I don't really like having to sprinkle special casts through the
> code because of this.

True.  But the proper fix is to not do the indirection through
xfs_file_ioctl but instead to call xfs_ioc_scrub_metadata,
xfs_ioc_bulkstat, etc directly which all take a void __user
arguments already.