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SubjectRe: [PATCH RFC 0/4] Add firmware signature file check
At Tue, 06 Nov 2012 00:01:52 +0000,
David Howells wrote:
>
> Takashi Iwai <tiwai@suse.de> wrote:
>
> > this is a patch series to add the support for firmware signature
> > check. At this time, the kernel checks extra signature file (*.sig)
> > for each firmware, instead of embedded signature.
> > It's just a quick hack using the existing module signing mechanism,
> > thus provided only as a proof of concept for now.
>
> There is another way to do this. If you look at the patches I proposed to
> wrap keys in PE binaries, you'll find that that can handle PKCS#7 format
> messages as that's what's in the sort of signed PE binary we're dealing with.
>
> You could use this to put the firmware inside a signed-data PKCS#7 message.

Yeah, embedding the signature is more straightforward. Actually I
tried the embedded signature (just like module) at first, then a
couple of concerns arose:

- Legally unclear about "modifying" the firmware data or file,

- The signed firmware is no longer compatible with the older kernel,
thus bad for distro packaging.


thanks,

Takashi


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