Messages in this thread | | | Date | Thu, 11 Nov 2021 17:23:31 -0500 | Subject | Re: [PATCH 0/3] KEXEC_SIG with appended signature | From | Nayna <> |
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On 11/5/21 09:14, Michal Suchánek wrote: > On Fri, Nov 05, 2021 at 09:55:52PM +1100, Daniel Axtens wrote: >> Michal Suchanek <msuchanek@suse.de> writes: >> >>> S390 uses appended signature for kernel but implements the check >>> separately from module loader. >>> >>> Support for secure boot on powerpc with appended signature is planned - >>> grub patches submitted upstream but not yet merged. >> Power Non-Virtualised / OpenPower already supports secure boot via kexec >> with signature verification via IMA. I think you have now sent a >> follow-up series that merges some of the IMA implementation, I just >> wanted to make sure it was clear that we actually already have support > So is IMA_KEXEC and KEXEC_SIG redundant? > > I see some architectures have both. I also see there is a lot of overlap > between the IMA framework and the KEXEC_SIG and MODULE_SIg.
Originally, KEXEC_SIG was meant for PECOFF based signatures, while IMA_KEXEC mainly supported xattr based signatures.
Power (Non-virtualized/OpenPOWER) doesn't support PECOFF. Extended attributes based signature verification doesn't work with netboot. That's when appended signature support was added to IMA.
Using IMA_KEXEC has the benefit of being able to enable both signature verification and measurement of the kernel image.
Thanks & Regards,
- Nayna
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