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Date:   Fri, 17 Jul 2020 15:10:28 -0700
From:   Kees Cook <keescook@chromium.org>
To:     Scott Branden <scott.branden@broadcom.com>
Cc:     Mimi Zohar <zohar@linux.ibm.com>,
        Matthew Wilcox <willy@infradead.org>,
        James Morris <jmorris@namei.org>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Jessica Yu <jeyu@kernel.org>,
        Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
        "Serge E. Hallyn" <serge@hallyn.com>,
        Casey Schaufler <casey@schaufler-ca.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Matthew Garrett <matthewgarrett@google.com>,
        David Howells <dhowells@redhat.com>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        Randy Dunlap <rdunlap@infradead.org>,
        "Joel Fernandes (Google)" <joel@joelfernandes.org>,
        KP Singh <kpsingh@google.com>, Dave Olsthoorn <dave@bewaar.me>,
        Hans de Goede <hdegoede@redhat.com>,
        Peter Jones <pjones@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Stephen Boyd <stephen.boyd@linaro.org>,
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        linux-fsdevel@vger.kernel.org, kexec@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/13] Introduce partial kernel_read_file() support
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On Fri, Jul 17, 2020 at 12:17:02PM -0700, Scott Branden wrote:
> Thanks for sending out.? This looks different than your other patch series.

Yes, it mutated in my head as I considered how all of this should hang
together, which is why I wanted to get it sent before the weekend. I'm
still trying to figure out why the fireware testsuite fails for me, etc.

> We should get the first 5 patches accepted now though as they are
> simple cleanups and fixes.? That will reduce the number of outstanding
> patches in the series.

Agreed. I'd like to get some more eyes on it, but I can get it ready for
-next.

> At first glance the issue with the changes after that is the existing
> API assumes it has read the whole file and failed if it did not.
> Now, if the file is larger than the amount requested there is no indication?

The intention is to have old API users unchanged and new users can use
a pre-allocated buf (with buf_size) along with file_size to examine
their partial read progress. If I broke the old API, that's a bug and I
need to fix it, but that's why I wanted to start with the firmware test
suite (basic things like module loading work fine after this series, but
I wanted to really exercise the corners that the firmware suite pokes
at).

-- 
Kees Cook