Re: kexec_load(2) bypasses signature verification

From: Dave Young
Date: Wed Jun 17 2015 - 21:25:54 EST


On 06/15/15 at 04:01pm, Theodore Ts'o wrote:
> On Mon, Jun 15, 2015 at 09:37:05AM -0400, Josh Boyer wrote:
> > The bits that actually read Secure Boot state out of the UEFI
> > variables, and apply protections to the machine to avoid compromise
> > under the SB threat model. Things like disabling the old kexec...
>
> I don't have any real interest in using Secure Boot, but I *am*
> interested in using CONFIG_KEXEC_VERIFY_SIG[1]. So perhaps we need to
> have something similar to what we have with signed modules in terms of
> CONFIG_MODULE_SIG_FORCE and module/sig_enforce, but for
> KEXEC_VERIFY_SIG. This would mean creating a separate flag
> independent of the one Linus suggested for Secure Boot, but since we
> have one for signed modules, we do have precedent for this sort of
> thing.

Agree and vote for this way as I replied in another email about
CONFIG_KEXEC_VERIFY_SIG_FORCE.

Thanks
Dave
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/