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

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Date:   Tue, 10 Aug 2021 10:13:59 +0530
From:   Ashish Mhetre <amhetre@...dia.com>
To:     <amhetre@...dia.com>, <robin.murphy@....com>, <will@...nel.org>,
        <vdumpa@...dia.com>
CC:     <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [Patch V3 0/2] iommu/arm-smmu: Fix races in iommu domain/group creation

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.

Ashish Mhetre (1):
  iommu: Fix race condition during default domain allocation

Krishna Reddy (1):
  iommu/arm-smmu: Fix race condition during iommu_group creation

 drivers/iommu/arm/arm-smmu/arm-smmu.c | 6 +++++-
 drivers/iommu/iommu.c                 | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

-- 
2.7.4