linux-kernel - Re: [PATCH V10 06/12] of: device: Fix overflow of coherent_dma

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Date:   Thu, 6 Apr 2017 15:45:37 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Sricharan R <sricharan@...eaurora.org>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        Tomasz Nowicki <tn@...ihalf.com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        Sinan Kaya <okaya@...eaurora.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH V10 06/12] of: device: Fix overflow of coherent_dma_mask

On 06/04/17 14:56, Rob Herring wrote:
> On Thu, Apr 6, 2017 at 5:24 AM, Robin Murphy <robin.murphy@....com> wrote:
>> On 06/04/17 08:01, Frank Rowand wrote:
>>> On 04/04/17 03:18, Sricharan R wrote:
>>>> Size of the dma-range is calculated as coherent_dma_mask + 1
>>>> and passed to arch_setup_dma_ops further. It overflows when
>>>> the coherent_dma_mask is set for full 64 bits 0xFFFFFFFFFFFFFFFF,
>>>> resulting in size getting passed as 0 wrongly. Fix this by
>>>> passsing in max(mask, mask + 1). Note that in this case
>>>> when the mask is set to full 64bits, we will be passing the mask
>>>> itself to arch_setup_dma_ops instead of the size. The real fix
>>>> for this should be to make arch_setup_dma_ops receive the
>>>> mask and handle it, to be done in the future.
>>>>
>>>> Signed-off-by: Sricharan R <sricharan@...eaurora.org>
>>>> ---
>>>>  drivers/of/device.c | 2 +-
>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/of/device.c b/drivers/of/device.c
>>>> index c17c19d..c2ae6bb 100644
>>>> --- a/drivers/of/device.c
>>>> +++ b/drivers/of/device.c
>>>> @@ -107,7 +107,7 @@ void of_dma_configure(struct device *dev, struct device_node *np)
>>>>      ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
>>>>      if (ret < 0) {
>>>>              dma_addr = offset = 0;
>>>> -            size = dev->coherent_dma_mask + 1;
>>>> +            size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
>>>>      } else {
>>>>              offset = PFN_DOWN(paddr - dma_addr);
>>>>              dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
>>>>
>>>
>>> NACK.
>>>
>>> Passing an invalid size to arch_setup_dma_ops() is only part of the problem.
>>> size is also used in of_dma_configure() before calling arch_setup_dma_ops():
>>>
>>>         dev->coherent_dma_mask = min(dev->coherent_dma_mask,
>>>                                      DMA_BIT_MASK(ilog2(dma_addr + size)));
>>>         *dev->dma_mask = min((*dev->dma_mask),
>>>                              DMA_BIT_MASK(ilog2(dma_addr + size)));
>>>
>>> which would be incorrect for size == 0xffffffffffffffffULL when
>>> dma_addr != 0.  So the proposed fix really is not papering over
>>> the base problem very well.
>>
>> I'm not sure I agree there. Granted, there exist many more problematic
>> aspects than are dealt with here (I've got more patches cooking to sort
>> out some of the other issues we have with dma-ranges), but considering
>> size specifically:
>>
>> - It is not possible to explicitly specify a range with a size of 2^64
>> in DT. If someone does specify a size of 0, they've done a silly thing
>> and should not be surprised that it ends badly.
> 
> And because of this, we allow ~0 (both 32 and 64 bit) in DT dma-ranges
> and fix these up as 2^32 and 2^64 sizes.

...which is what Frank's patch gets rid of.

Robin.

> 
> Rob
>