Messages in this thread | | | Date | Tue, 10 Jun 2014 22:25:16 +0100 | From | Matthew Garrett <> | Subject | Re: [PATCH 0/4] KEYS: validate key trust with owner and builtin keys only |
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On Wed, Jun 11, 2014 at 12:17:53AM +0300, Dmitry Kasatkin wrote:
> It is probably just a paranoia... > Kconfig MODULE_SIG_UEFI should tell about threat of loading kernel > modules from NSA or Lenovo signed by MS or Lenovo keys.. > > This hole is opened without warning...
It's not typically a hole. If an attacker has root they can just replace your bootloader with one signed by a trusted key and then have that modify the kernel before booting it.
If you're using a TPM then you can mitigate this, but if you have a TPM then you're already performing some extra steps during the boot process. Just add a sysfs knob that lets you drop the db keys and incorporate that into the TPM management code.
-- Matthew Garrett | mjg59@srcf.ucam.org
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