Messages in this thread | | | Date | Thu, 29 Aug 2013 23:32:50 +0200 | From | Pavel Machek <> | Subject | Re: [RFC PATCH 00/18 v3] Signature verification of hibernate snapshot |
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Hi!
> > > - 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.
How many writes can UEFI NVRAM survive? (Is it NOR?)
"every S4 resume" may be approximately "every boot" for some users... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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