Re: [Xen-devel] Ping: [PATCH] VT-d: protect against bogus information coming from BIOS

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 05/08/13 14:06, Jan Beulich wrote:
> Ping?
>
>>>> On 10.07.13 at 12:26, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
>> Add checks similar to those done by Linux: The DRHD address must not
>> be all zeros or all ones (Linux only checks for zero), and capabilities
>> as well as extended capabilities must not be all ones.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

>>
>> --- a/xen/drivers/passthrough/vtd/dmar.c
>> +++ b/xen/drivers/passthrough/vtd/dmar.c
>> @@ -447,6 +447,9 @@ acpi_parse_one_drhd(struct acpi_dmar_hea
>>      if ( (ret = acpi_dmar_check_length(header, sizeof(*drhd))) != 0 )
>>          return ret;
>>  
>> +    if ( !drhd->address || !(drhd->address + 1) )
>> +        return -ENODEV;
>> +
>>      dmaru = xzalloc(struct acpi_drhd_unit);
>>      if ( !dmaru )
>>          return -ENOMEM;
>> --- a/xen/drivers/passthrough/vtd/iommu.c
>> +++ b/xen/drivers/passthrough/vtd/iommu.c
>> @@ -1159,6 +1159,9 @@ int __init iommu_alloc(struct acpi_drhd_
>>          dprintk(VTDPREFIX,
>>                  "cap = %"PRIx64" ecap = %"PRIx64"\n", iommu->cap, 
>> iommu->ecap);
>>      }
>> +    if ( !(iommu->cap + 1) || !(iommu->ecap + 1) )
>> +        return -ENODEV;
>> +
>>      if ( cap_fault_reg_offset(iommu->cap) +
>>           cap_num_fault_regs(iommu->cap) * PRIMARY_FAULT_REG_LEN >= 
>> PAGE_SIZE 
>> ||
>>           ecap_iotlb_offset(iommu->ecap) >= PAGE_SIZE )
>
>
>
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