Re: [Xen-devel] [Xen-users] UEFI Secure Boot Xen 4.9

[Tamas K Lengyel <tamas.k.lengyel@xxxxxxxxx>]

On Tue, Sep 5, 2017 at 12:26 PM, Tamas K Lengyel
<tamas.k.lengyel@xxxxxxxxx> wrote:
> On Mon, Sep 4, 2017 at 6:40 AM, Daniel Kiper <daniel.kiper@xxxxxxxxxx> wrote:
>> On Wed, Aug 30, 2017 at 10:16:23AM -0600, Tamas K Lengyel wrote:
>>> On Tue, Aug 29, 2017 at 2:01 PM, Daniel Kiper <daniel.kiper@xxxxxxxxxx> 
>>> wrote:
>>> > Hey Tamas,
>>> >
>>> > Sorry for late reply. I was on vacation.
>>> >
>>> > On Tue, Aug 22, 2017 at 09:01:06PM -0600, Tamas K Lengyel wrote:
>>> >> On Tue, May 16, 2017 at 5:04 AM, Daniel Kiper <daniel.kiper@xxxxxxxxxx> 
>>> >> wrote:
>>> >
>>> > [...]
>>> >
>>> >> > UEFI will verify shim secure boot signature then shim will verify GRUB2
>>> >> > signature then GRUB2 will verify (with shim protocol) Xen signature and
>>> >> > finally Xen will verify (with shim protocol) Linux kernel signature. 
>>> >> > Then
>>> >> > your kernel can verify modules using whatever you want.
>>> >> >
>>> >> >> I would be happy to work to help achieve this.
>>> >> >
>>> >> > There is a chance that I will have something very raw at the beginning
>>> >> > of June. If you wish to do tests drop me a line.
>>> >>
>>> >> Hi Daniel,
>>> >> is there any news on this? I would be interested in giving this a shot 
>>> >> too.
>>> >
>>> > Please look at
>>> >
>>> >   https://lists.xen.org/archives/html/xen-devel/2017-07/msg00982.html
>>> >
>>> > and at
>>> >
>>> >   https://lists.xen.org/archives/html/xen-devel/2017-07/msg00985.html
>>> >
>>> > Attachments contain the same patches as above but rebased on latest
>>> > GRUB2 and Xen git repositories.
>>> >
>>> > Due to some travel I am going to restart work on this in the second
>>> > half of September.
>>> >
>>> > If you have any questions please drop me a line.
>>> >
>>>
>>> Hi Daniel,
>>> thanks for the update, I'll give it a shot today to set it up. In a
>>> somewhat related note, are you aware of any work on getting secure
>>> boot + UEFI working in a guest? There is a PoC patch on OpenXT
>>> (https://github.com/OpenXT/xenclient-oe/pull/729) but was wondering if
>>> there are any parallel efforts ongoing.
>>
>> I do not follow this issue in detail. However, I suppose that if OVMF
>> supports UEFI secure boot (well, QEMU has to enable SMM support too;
>> I do not know does it work with Xen or not) then guest should work
>> without any issue. Just guessing...
>>
>
> Sure, was just wondering if you are aware of anyone looking at that.
>
> In other news I was able to get your patches working and have been
> able to boot with Secure boot enabled as far as shim -> signed grub ->
> signed linux without initrd. If I boot a signed version of Xen from
> grub it goes as far as setup_efi_pci but then the system reboots
> without anything else being printed on the screen. I haven't been able
> to debug it any further yet.
>

Daniel,
just FYI the xen.mb.efi generated with your patches causes pesign to segfault:

cms_pe_common.c:generate_digest:198 PE section ".text" has invalid address
Segmentation fault

Tamas

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