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From: Will Deacon <will@kernel.org>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: heikki.krogerus@linux.intel.com,
	thomas.hellstrom@linux.intel.com, peterz@infradead.org,
	benh@kernel.crashing.org, joonas.lahtinen@linux.intel.com,
	dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk,
	grant.likely@arm.com, paulus@samba.org,
	Frank Rowand <frowand.list@gmail.com>,
	mingo@kernel.org, sstabellini@kernel.org,
	Saravana Kannan <saravanak@google.com>,
	mpe@ellerman.id.au,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Christoph Hellwig <hch@lst.de>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	bskeggs@redhat.com, linux-pci@vger.kernel.org,
	xen-devel@lists.xenproject.org,
	Thierry Reding <treding@nvidia.com>,
	intel-gfx@lists.freedesktop.org, matthew.auld@intel.com,
	linux-devicetree <devicetree@vger.kernel.org>,
	jxgao@google.com, daniel@ffwll.ch,
	maarten.lankhorst@linux.intel.com, airlied@linux.ie,
	Dan Williams <dan.j.williams@intel.com>,
	linuxppc-dev@lists.ozlabs.org, jani.nikula@linux.intel.com,
	Rob Herring <robh+dt@kernel.org>,
	rodrigo.vivi@intel.com, bhelgaas@google.com,
	Claire Chang <tientzu@chromium.org>,
	boris.ostrovsky@oracle.com,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	jgross@suse.com, Nicolas Boichat <drinkcat@chromium.org>,
	Greg KH <gregkh@linuxfoundation.org>,
	Randy Dunlap <rdunlap@infradead.org>,
	quic_qiancai@quicinc.com, lkml <linux-kernel@vger.kernel.org>,
	"list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
	Jim Quinlan <james.quinlan@broadcom.com>,
	xypron.glpk@gmx.de, thomas.lendacky@amd.com,
	Robin Murphy <robin.murphy@arm.com>,
	bauerman@linux.ibm.com
Subject: Re: [PATCH v15 00/12] Restricted DMA
Date: Fri, 25 Jun 2021 13:30:05 +0100	[thread overview]
Message-ID: <20210625123004.GA3170@willie-the-truck> (raw)
In-Reply-To: <YNTa1C5uvz+qWryf@char.us.oracle.com>

On Thu, Jun 24, 2021 at 03:19:48PM -0400, Konrad Rzeszutek Wilk wrote:
> On Thu, Jun 24, 2021 at 11:55:14PM +0800, Claire Chang wrote:
> > This series implements mitigations for lack of DMA access control on
> > systems without an IOMMU, which could result in the DMA accessing the
> > system memory at unexpected times and/or unexpected addresses, possibly
> > leading to data leakage or corruption.
> > 
> > For example, we plan to use the PCI-e bus for Wi-Fi and that PCI-e bus is
> > not behind an IOMMU. As PCI-e, by design, gives the device full access to
> > system memory, a vulnerability in the Wi-Fi firmware could easily escalate
> > to a full system exploit (remote wifi exploits: [1a], [1b] that shows a
> > full chain of exploits; [2], [3]).
> > 
> > To mitigate the security concerns, we introduce restricted DMA. Restricted
> > DMA utilizes the existing swiotlb to bounce streaming DMA in and out of a
> > specially allocated region and does memory allocation from the same region.
> > The feature on its own provides a basic level of protection against the DMA
> > overwriting buffer contents at unexpected times. However, to protect
> > against general data leakage and system memory corruption, the system needs
> > to provide a way to restrict the DMA to a predefined memory region (this is
> > usually done at firmware level, e.g. MPU in ATF on some ARM platforms [4]).
> > 
> > [1a] https://googleprojectzero.blogspot.com/2017/04/over-air-exploiting-broadcoms-wi-fi_4.html
> > [1b] https://googleprojectzero.blogspot.com/2017/04/over-air-exploiting-broadcoms-wi-fi_11.html
> > [2] https://blade.tencent.com/en/advisories/qualpwn/
> > [3] https://www.bleepingcomputer.com/news/security/vulnerabilities-found-in-highly-popular-firmware-for-wifi-chips/
> > [4] https://github.com/ARM-software/arm-trusted-firmware/blob/master/plat/mediatek/mt8183/drivers/emi_mpu/emi_mpu.c#L132
> > 
> > v15:
> > - Apply Will's diff (https://lore.kernel.org/patchwork/patch/1448957/#1647521)
> >   to fix the crash reported by Qian.
> > - Add Stefano's Acked-by tag for patch 01/12 from v14
> 
> That all should be now be on
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb.git/
> devel/for-linus-5.14 (and linux-next)

Thanks Konrad!

Will
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      parent reply	other threads:[~2021-06-25 12:30 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-24 15:55 Claire Chang
2021-06-24 15:55 ` [PATCH v15 01/12] swiotlb: Refactor swiotlb init functions Claire Chang
2021-06-24 15:55 ` [PATCH v15 02/12] swiotlb: Refactor swiotlb_create_debugfs Claire Chang
2021-06-24 15:55 ` [PATCH v15 03/12] swiotlb: Set dev->dma_io_tlb_mem to the swiotlb pool used Claire Chang
2021-06-24 15:55 ` [PATCH v15 04/12] swiotlb: Update is_swiotlb_buffer to add a struct device argument Claire Chang
2021-06-24 15:55 ` [PATCH v15 05/12] swiotlb: Update is_swiotlb_active " Claire Chang
2021-06-24 15:55 ` [PATCH v15 06/12] swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing Claire Chang
2021-06-30  1:43   ` Nathan Chancellor
2021-06-30  9:17     ` Claire Chang
2021-06-30 11:43       ` Will Deacon
2021-06-30 15:56         ` Nathan Chancellor
2021-07-01  7:40           ` Will Deacon
2021-07-01  7:52             ` Nathan Chancellor
2021-07-02 13:58               ` Will Deacon
2021-07-02 15:13                 ` Robin Murphy
2021-07-03  5:55                   ` Nathan Chancellor
2021-07-05  7:29                     ` Claire Chang
2021-07-05 18:25                       ` Nathan Chancellor
2021-07-05 19:03                     ` Will Deacon
2021-07-06  4:48                       ` Christoph Hellwig
2021-07-06 13:24                         ` Will Deacon
2021-07-06 14:01                           ` Robin Murphy
2021-07-06 14:05                             ` Christoph Hellwig
2021-07-06 14:46                               ` Konrad Rzeszutek Wilk
2021-07-06 16:57                                 ` Will Deacon
2021-07-06 16:59                                   ` Konrad Rzeszutek Wilk
2021-07-12 13:56                                     ` Will Deacon
2021-07-14  0:06                                       ` Konrad Rzeszutek Wilk
2021-07-06 15:39                               ` Robin Murphy
2021-07-06 17:06                                 ` Will Deacon
2021-07-06 19:14                                   ` Nathan Chancellor
2021-07-08 16:44                                     ` Will Deacon
2021-06-24 15:55 ` [PATCH v15 07/12] swiotlb: Move alloc_size to swiotlb_find_slots Claire Chang
2021-06-24 15:55 ` [PATCH v15 08/12] swiotlb: Refactor swiotlb_tbl_unmap_single Claire Chang
2021-06-24 15:55 ` [PATCH v15 09/12] swiotlb: Add restricted DMA alloc/free support Claire Chang
2021-06-24 15:55 ` [PATCH v15 10/12] swiotlb: Add restricted DMA pool initialization Claire Chang
2021-08-24 14:26   ` Guenter Roeck
2021-08-27  3:50     ` Claire Chang
2021-08-27  6:58   ` Andy Shevchenko
2021-06-24 15:55 ` [PATCH v15 11/12] dt-bindings: of: Add restricted DMA pool Claire Chang
2021-06-24 15:55 ` [PATCH v15 12/12] of: Add plumbing for " Claire Chang
2021-07-02  3:08   ` Guenter Roeck
2021-07-02 11:39     ` Robin Murphy
2021-07-02 13:18       ` Will Deacon
2021-07-02 13:48         ` Guenter Roeck
2021-06-24 19:19 ` [PATCH v15 00/12] Restricted DMA Konrad Rzeszutek Wilk
2021-06-25  0:41   ` Claire Chang
2021-06-25 12:30   ` Will Deacon [this message]

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