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From: Robin Murphy <robin.murphy@arm.com>
To: Qian Cai <cai@lca.pw>, Joerg Roedel <joro@8bytes.org>
Cc: Heiko Stuebner <heiko@sntech.de>,
	virtualization@lists.linux-foundation.org,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Daniel Drake <drake@endlessm.com>, Will Deacon <will@kernel.org>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	linux-samsung-soc@vger.kernel.org,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	linux-rockchip@lists.infradead.org,
	Andy Gross <agross@kernel.org>,
	jonathan.derrick@intel.com, linux-s390@vger.kernel.org,
	linux-arm-msm@vger.kernel.org,
	linux-mediatek@lists.infradead.org, linux-tegra@vger.kernel.org,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	Kukjin Kim <kgene@kernel.org>,
	David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH v3 00/34] iommu: Move iommu_group setup to IOMMU core code
Date: Wed, 1 Jul 2020 11:53:07 +0100
Message-ID: <9b0ef27a-f249-a90b-9899-e53b946f83cc@arm.com> (raw)
In-Reply-To: <20200701004020.GA6221@lca.pw>

On 2020-07-01 01:40, Qian Cai wrote:
> Looks like this patchset introduced an use-after-free on arm-smmu-v3.
> 
> Reproduced using mlx5,
> 
> # echo 1 > /sys/class/net/enp11s0f1np1/device/sriov_numvfs
> # echo 0 > /sys/class/net/enp11s0f1np1/device/sriov_numvfs
> 
> The .config,
> https://github.com/cailca/linux-mm/blob/master/arm64.config
> 
> Looking at the free stack,
> 
> iommu_release_device->iommu_group_remove_device
> 
> was introduced in 07/34 ("iommu: Add probe_device() and release_device()
> call-backs").

Right, iommu_group_remove_device can tear down the group and call 
->domain_free before the driver has any knowledge of the last device 
going away via the ->release_device call.

I guess the question is do we simply flip the call order in 
iommu_release_device() so drivers can easily clean up their internal 
per-device state first, or do we now want them to be robust against 
freeing domains with devices still nominally attached?

Robin.

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Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-29 13:36 Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 01/34] iommu: Move default domain allocation to separate function Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 02/34] iommu: Add def_domain_type() callback in iommu_ops Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 03/34] iommu/amd: Implement iommu_ops->def_domain_type call-back Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 04/34] iommu/vt-d: Wire up iommu_ops->def_domain_type Joerg Roedel
2020-04-29 23:58   ` Lu Baolu
2020-04-29 13:36 ` [PATCH v3 05/34] iommu/amd: Remove dma_mask check from check_device() Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 06/34] iommu/amd: Return -ENODEV in add_device when device is not handled by IOMMU Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 07/34] iommu: Add probe_device() and release_device() call-backs Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 08/34] iommu: Move default domain allocation to iommu_probe_device() Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 09/34] iommu: Keep a list of allocated groups in __iommu_probe_device() Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 10/34] iommu: Move new probe_device path to separate function Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 11/34] iommu: Split off default domain allocation from group assignment Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 12/34] iommu: Move iommu_group_create_direct_mappings() out of iommu_group_add_device() Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 13/34] iommu: Export bus_iommu_probe() and make is safe for re-probing Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 14/34] iommu/amd: Remove dev_data->passthrough Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 15/34] iommu/amd: Convert to probe/release_device() call-backs Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 16/34] iommu/vt-d: " Joerg Roedel
2020-04-30  0:07   ` Lu Baolu
2020-04-29 13:36 ` [PATCH v3 17/34] iommu/arm-smmu: " Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 18/34] iommu/pamu: " Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 19/34] iommu/s390: " Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 20/34] iommu/virtio: " Joerg Roedel
2020-04-29 13:36 ` [PATCH v3 21/34] iommu/msm: " Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 22/34] iommu/mediatek: " Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 23/34] iommu/mediatek-v1 " Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 24/34] iommu/qcom: " Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 25/34] iommu/rockchip: " Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 26/34] iommu/tegra: " Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 27/34] iommu/renesas: " Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 28/34] iommu/omap: Remove orphan_dev tracking Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 29/34] iommu/omap: Convert to probe/release_device() call-backs Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 30/34] iommu/exynos: Use first SYSMMU in controllers list for IOMMU core Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 31/34] iommu/exynos: Convert to probe/release_device() call-backs Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 32/34] iommu: Remove add_device()/remove_device() code-paths Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 33/34] iommu: Move more initialization to __iommu_probe_device() Joerg Roedel
2020-04-29 13:37 ` [PATCH v3 34/34] iommu: Unexport iommu_group_get_for_dev() Joerg Roedel
2020-05-05 12:37 ` [PATCH v3 00/34] iommu: Move iommu_group setup to IOMMU core code Joerg Roedel
2020-07-01  0:40 ` Qian Cai
2020-07-01 10:53   ` Robin Murphy [this message]
2020-07-04  0:17   ` Qian Cai

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