Re: [RFC] Kdump with signed images.

Maxim Uvarov
2012-10-23T19:11:10Z

2012/10/23 Vivek Goyal <vgoyal@redhat.com>:
> On Tue, Oct 23, 2012 at 09:26:32AM -0700, Eric W. Biederman wrote:
>
> [..]
>> > I think this will be a new parallel path and this new path should be taken
>> > only on kernel booted with secure boot enabled. (Either automatically or
>> > by using some kexec command line option). So nothing should be broken
>> > because we never supported anything on secure boot enabled system.
>>
>> Rubbish. Kexec works just fine today on a secure boot enabled system.
>> Ignoring the nonsense that there is no such thing as a secure boot
>> enabled linux system.
>
> I think it is a security hole for the systems where we don't want to run
> unsigned priviliged code. So yes, it works as of today, but at some point
> of time we shall have to close this hole.
>
> Thanks
> Vivek
>
Signatures kernel & modules in general good for support reason. We can
say for example that we support only signed kernel and signed modules
for that kernel, so we are sure that this binaries match our source.
But what is the reason of checking signatures in kexec? If you have
root privileges then more likely you have access to boot loader or to
physical machine (console, bios). Might be useful only for embedded
things to prevent enthusiasts play with already manufactured devices.

Maxim.

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--
Best regards,
Maxim Uvarov