On Thu Jan 31 19, Linus Torvalds wrote:

On Thu, Jan 31, 2019 at 12:47 PM Jarkko Sakkinen
[off-list ref] wrote:

quoted

I'll try it first thing when I wake up tomorrow (11PM in Finland ATM).

Thanks.

quoted

Appreciate for taking time on this.

Hey, it was my commit that broke it for you. Even if it happened to
work before, and only did so by pure luck, it was a functional
regression.

I get very upset when other developers don't step up when *their*
changes break something, and I don't consider "it shouldn't have
worked in the first place" to be a valid excuse. You broke it, you'd
better fix it.

So I had better fix my own mess too, in order to not look too hypocritical.

And I was very aware that hardcoding the memcpy_*io() access patterns
might break something. I just _hoped_ it wouldn't, because we actually
ended up going back to the very original access patterns (but it was
from a long long time ago).

In fact, while it's slightly annoying, in many ways it's actually good
that we found breakage, and could pinpoint exactly *why* it broke.
That does validate the whole "we shouldn't just depend on the random
implementation detail of 'memcpy()'" argument.

So I'll wait to hear back whether that patch fixes things for you, but
I _think_ it will, and we'll be better off in the long range with this
whole thing.

             Linus

I just did a quick test here of booting and running a couple commands
(tpm2_getcap, tpm2_pcrlist), and the patch seems to work for me. I was
seeing the error during tpm_crb initialization without the patch.