Re: [PATCH v12 00/11] Appended signatures support for IMA appraisal

From: Thiago Jung Bauermann
Date: Mon Aug 26 2019 - 21:05:07 EST

Hello Jordan,

Jordan Hand <jorhand@xxxxxxxxxxxxxxxxxxx> writes:

> On 6/27/19 7:19 PM, Thiago Jung Bauermann wrote:
>> On the OpenPOWER platform, secure boot and trusted boot are being
>> implemented using IMA for taking measurements and verifying signatures.
>> Since the kernel image on Power servers is an ELF binary, kernels are
>> signed using the scripts/sign-file tool and thus use the same signature
>> format as signed kernel modules.
>> This patch series adds support in IMA for verifying those signatures.
>> It adds flexibility to OpenPOWER secure boot, because it allows it to boot
>> kernels with the signature appended to them as well as kernels where the
>> signature is stored in the IMA extended attribute.
> I know this is pretty late, but I just wanted to let you know that I
> tested this patch set on x86_64 with QEMU.
> That is, I enrolled a key to _ima keyring, signed my kernel and modules
> with appended signatures (with scripts/sign-file), set the IMA policy to
> appraise and measure my kernel and modules. Also tested kexec appraisal.
> You can add my tested-by if you'd like.

Thanks for testing!

Thiago Jung Bauermann
IBM Linux Technology Center