Re: [Xen-devel] Invalid length provided for SMBIOS data

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

I've checked in a simplification of the SMBIOS code as changeset 11686 in
xen-unstable. Since this entirely removes the code that computes the table
size 'ahead of time', it is very likely to fix this bug. We now *definitely*
write the number of bytes that we actually emitted when constructing the
tables. So unless the tables themselves are screwed, the length field must
now surely be correct.

 -- Keir

On 2/10/06 15:10, "Andrew D. Ball" <aball@xxxxxxxxxx> wrote:

> This is seriously broken -- I'll write a patch as soon as I can, unless
> somebody beats me to it :-)
> 
> Peace.
> Andrew
> 
> On Wed, 2006-09-27 at 19:03 +0100, Daniel P. Berrange wrote:
>> I was running some tests of HVM guests on Fedora Core 6, test3 and came
>> across a potential issue with SMBIOS data. When running dmidecode in the
>> guest VMs it reports that the actual SMBIOS data size, does not match
>> the advertised size. eg
>> 
>> "Wrong DMI structures length: 439 bytes announced, structures occupy 363
>> bytes."
>> 
>> I've tried this in a variety of guest OS (RHEL-3 32-bit, RHEL-3 64-bit,
>> RHEL-4 64-bit) all the same results. The host is running FC6 test3, but
>> the bit of code responsible for constructing the SMBIOS tables is identical
>> to that on the vanilla xen-unstable.hg  repository. I'm not familiar
>> enough with SMBIOS specs / code to determine where the mistake in the
>> length calculation is though...
>> 
>> Is anyone else seeing this length mismatch in HVM guests ?
>> 
>> FYI, we're tracking this as
>> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=207501
>> 
>> Regards,
>> Dan.
> 
> 
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