Re: [RFC PATCH 00/18 v3] Signature verification of hibernatesnapshot

[joeyli]

Hi Florian, 

Thanks for your response.

æ äï2013-08-28 æ 23:01 +0200ïFlorian Weimer æåï
> * Chun-Yi Lee:
> 
> >  + EFI bootloader must generate RSA key-pair when system boot:

I should add more information on this sentence for mention need GenS4Key
runtime variable then re-generate key-pair.

Thanks!

> >    - Bootloader store the public key to EFI boottime variable by itself
> >    - Bootloader put The private key to S4SignKey EFI variable for forward to
> >      kernel.
> 
> Is the UEFI NVRAM really suited for such regular updates?
> 

Yes, Matthew raised this concern at before. I modified patch to load
private key in efi stub kernel, before ExitBootServices(), that means we
don't need generate key-pair at every system boot. So, the above
procedure of efi bootloader will only run one time. 

User can enable SNAPSHOT_REGEN_KEYS kernel config to notify efi
booloader regenerate key-pair for every S4 to improve security if he
want. So, the key-pair re-generate procedure will only launched when S4
resume, not every system boot.


Thanks a lot!
Joey Lee

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