linux-kernel - Re: [PATCH v4 3/5] iommu/uapi: Use named union for user data

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Message-ID: <20200708081858.37091f4b@jacob-builder>
Date:   Wed, 8 Jul 2020 08:18:58 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Yi Liu <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jonathan Corbet <corbet@....net>, jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v4 3/5] iommu/uapi: Use named union for user data

On Wed, 8 Jul 2020 10:17:57 +0800
Lu Baolu <baolu.lu@...ux.intel.com> wrote:

> Hi Jacob,
> 
> On 7/8/20 7:43 AM, Jacob Pan wrote:
> > IOMMU UAPI data size is filled by the user space which must be
> > validated by ther kernel. To ensure backward compatibility, user
> > data can only be extended by either re-purpose padding bytes or
> > extend the variable sized union at the end. No size change is
> > allowed before the union. Therefore, the minimum size is the offset
> > of the union.
> > 
> > To use offsetof() on the union, we must make it named.
> > 
> > Link:https://lkml.org/lkml/2020/6/11/834  
> 
> Please use lore.kernel.org links.
> 
OK. will do.

> Best regards,
> baolu

[Jacob Pan]