linux-kernel - Re: [PATCH v1 01/16] iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and IOMMU_VIOMMU

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Message-ID: <20240815233743.GW2032816@nvidia.com>
Date: Thu, 15 Aug 2024 20:37:43 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, will@...nel.org, joro@...tes.org,
	suravee.suthikulpanit@....com, robin.murphy@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com, shuah@...nel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v1 01/16] iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and
 IOMMU_VIOMMU_ALLOC ioctl

On Thu, Aug 15, 2024 at 11:20:35AM -0700, Nicolin Chen wrote:

> > I don't have an easy solution in mind though later as surely we will
> > need this when we start to create more iommu bound objects. I'm pretty
> > sure syzkaller would eventually find such a UAF using the iommufd
> > selftest framework.
> 
> Would adding a user count in struct iommu_device help?

Yeah, maybe something like that. It is a real corner case though.

Jason