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Re: [PATCH 1/7] multiboot2: Add load type header and support for the PE binary type
- To: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 14 Mar 2024 14:37:37 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Daniel Kiper <daniel.kiper@xxxxxxxxxx>, grub-devel@xxxxxxx
- Delivery-date: Thu, 14 Mar 2024 13:37:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.03.2024 10:30, Ross Lagerwall wrote:
> On Thu, Mar 14, 2024 at 7:24 AM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>>
>> On 13.03.2024 16:07, Ross Lagerwall wrote:
>>> In addition to the existing address and ELF load types, specify a new
>>> optional PE binary load type. This new type is a useful addition since
>>> PE binaries can be signed and verified (i.e. used with Secure Boot).
>>
>> And the consideration to have ELF signable (by whatever extension to
>> the ELF spec) went nowhere?
>>
>
> I'm not sure if you're referring to some ongoing work to create signable
> ELFs that I'm not aware of.
Something must have been invented already to make Linux modules signable.
> I didn't choose that route because:
>
> * Signed PE binaries are the current standard for Secure Boot.
>
> * Having signed ELF binaries would mean that code to handle them needs
> to be added to Shim which contravenes its goals of being small and
> simple to verify.
Both true, but neither goes entirely without saying, I suppose.
> * I could be wrong on this but to my knowledge, the ELF format is not
> being actively updated nor is the standard owned/maintained by a
> specific group which makes updating it difficult.
And PE/COFF isn't under control of a public entity / group afaik, which
may be viewed as no better, if not worse.
> * Tools would need to be updated/developed to add support for signing
> ELF binaries and inspecting the signatures.
As above, yes indeed.
Jan
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