linux-kernel - Re: [Patch V3 0/2] iommu/arm-smmu: Fix races in iommu domain/group creation

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Date:   Tue, 10 Aug 2021 21:25:54 +0100
From:   Will Deacon <will@...nel.org>
To:     robin.murphy@....com, vdumpa@...dia.com,
        Ashish Mhetre <amhetre@...dia.com>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [Patch V3 0/2] iommu/arm-smmu: Fix races in iommu domain/group creation

On Tue, 10 Aug 2021 10:13:59 +0530, Ashish Mhetre wrote:
> When two devices with same SID are getting probed concurrently through
> iommu_probe_device(), the iommu_group and iommu_domain are allocated more
> than once because they are not protected for concurrency. This is leading
> to context faults when one device is accessing IOVA from other device.
> Fix this by protecting iommu_domain and iommu_group creation with mutexes.
> 
> Changes in v3:
> * Updated commit messages.
> * Added Signed-off-by in patch 2.
> 
> [...]

Applied to will (for-joerg/arm-smmu/updates), thanks!

[1/2] iommu: Fix race condition during default domain allocation
      https://git.kernel.org/will/c/211ff31b3d33
[2/2] iommu/arm-smmu: Fix race condition during iommu_group creation
      https://git.kernel.org/will/c/b1a1347912a7

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev