linux-kernel - Re: [PATCH v2 1/7] genirq/msi: Store the IOMMU IOVA directly in msi_desc instead of iommu

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Message-ID: <20250221140557.GL50639@nvidia.com>
Date: Fri, 21 Feb 2025 10:05:57 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Nicolin Chen <nicolinc@...dia.com>, kevin.tian@...el.com,
	maz@...nel.org, joro@...tes.org, will@...nel.org,
	robin.murphy@....com, shuah@...nel.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org, eric.auger@...hat.com,
	baolu.lu@...ux.intel.com, yi.l.liu@...el.com, yury.norov@...il.com,
	jacob.pan@...ux.microsoft.com, patches@...ts.linux.dev
Subject: Re: [PATCH v2 1/7] genirq/msi: Store the IOMMU IOVA directly in
 msi_desc instead of iommu_cookie

On Fri, Feb 21, 2025 at 10:28:20AM +0100, Thomas Gleixner wrote:
> On Wed, Feb 19 2025 at 17:31, Nicolin Chen wrote:
> > Fix the MSI cookie UAF by removing the cookie pointer. The translated IOVA
> > address is already known during iommu_dma_prepare_msi() and cannot change.
> > Thus, it can simply be stored as an integer in the MSI descriptor.
> >
> > A following patch will fix the other UAF in iommu_get_domain_for_dev(), by
> > using the IOMMU group mutex.
> 
> "A following patch" has no meaning once the current one is
> applied. Simply say:
> 
>   The other UAF in iommu_get_domain_for_dev() will be addressed
>   seperately, by ....

I used this paragraph: 

The other UAF related to iommu_get_domain_for_dev() will be addressed in
patch "iommu: Make iommu_dma_prepare_msi() into a generic operation" by
using the IOMMU group mutex.

Thanks,
Jason