On Mon, Feb 22, 2021 at 07:36:27AM +0000, Matthew Garrett wrote:

On Sat, Feb 20, 2021 at 05:05:36AM +0200, Jarkko Sakkinen wrote:

quoted

On Sat, Feb 20, 2021 at 01:32:49AM +0000, Matthew Garrett wrote:

quoted

Performing any sort of state validation of a sealed TPM blob requires
being able to access the individual members in the response. Parse the
blob sufficiently to be able to stash pointers to each member, along
with the length.

Signed-off-by: Matthew Garrett <redacted>

I'll just say LGTM for now. Did not see anything obviously wrong in
the code change (and does make sense to nitpick minor things just
yet).

Need to understand the whole use case just a little bit better.

I wrote this up with some more detail at 
https://mjg59.dreamwidth.org/55845.html - it seemed longer than
appropriate for a commit message, but if you'd like more detail
somewhere I can certainly add it.

Thanks (bookmarked). I'll read it before reviewing +1 version.

Requiring a config flag is something that slows down adoption in the
stock kernels.

Since we are talking about hibernate the decision whether to have this
feature set, does not have to be something that needs to be changed
dynamically to a running system.

So: maybe the best compromise would be to have it kernel command line
option? That way it's easier feature to adapt (e.g. with GRUB
configuration) and to enable in the kernel.

/Jarkko