linux-kernel - RE: [PATCH v4 14/23] iommufd: Add mmap interface

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Message-ID: <BN9PR11MB5276DD2F2CDC313FA04155C18C93A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Fri, 16 May 2025 04:08:25 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Jason Gunthorpe <jgg@...dia.com>, Nicolin Chen <nicolinc@...dia.com>
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Subject: RE: [PATCH v4 14/23] iommufd: Add mmap interface

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Friday, May 16, 2025 12:47 AM
> 
> On Thu, May 08, 2025 at 08:02:35PM -0700, Nicolin Chen wrote:
> > +	/* vma->vm_pgoff carries an index to an mtree entry (immap) */
> > +	immap = mtree_load(&ictx->mt_mmap, vma->vm_pgoff);
> > +	if (!immap)
> > +		return -ENXIO;
> > +	if (length >> PAGE_SHIFT != immap->num_pfns)
> > +		return -ENXIO;
> 
> This needs to validate that vm_pgoff is at the start of the immap or
> num_pfns is the wrong thing to validate length against.
> 

vm_pgoff is the index into mtree. If it's wrong mtree_load() will
fail already?