linux-kernel - Re: [PATCH v6 3/5] test: add new driver

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Date:   Fri, 12 May 2017 09:28:47 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Wagner <wagi@...om.org>,
        David Woodhouse <dwmw2@...radead.org>, rafal@...ecki.pl,
        Arend Van Spriel <arend.vanspriel@...adcom.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Li, Yi" <yi1.li@...ux.intel.com>, atull@...nsource.altera.com,
        moritz.fischer@...us.com, Petr Mladek <pmladek@...e.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luciano Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Andy Lutomirski <luto@...nel.org>,
        David Howells <dhowells@...hat.com>,
        Peter Jones <pjones@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 3/5] test: add new driver_data load tester

On Thu, May 11, 2017 at 11:32:30AM -0700, Luis R. Rodriguez wrote:
> On Thu, May 11, 2017 at 11:26 AM, Luis R. Rodriguez <mcgrof@...e.com> wrote:
> >
> > It would seems to make sense to me to only need to verify files when read
> > for the first time, once its cache I don't see why we would re-verify them ?
> 
> To be clear, the fw cache feature reads the files from the fs prior to
> suspend, and then uses the in-memory cache on resume. So it would make
> sense to me only to rely on fw verification on resume then when the fw
> cache is used ?

Good point. I was thinking of need for verification on resume.
As cache is not protected and visible to the kernel, some malware
might want to rewrite it :)

Thanks,
-Takahiro AKASHI

>  Luis