linux-kernel - Re: [PATCH] Revert "ext4 crypto: fix to check feature status before get policy"

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Message-ID: <CAD=FV=X6Q3QZaND-tfYr9mf-KYMeKFmJDca3ee-i9roWj+GHsQ@mail.gmail.com>
Date:   Wed, 30 Oct 2019 14:59:03 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Gwendal Grignou <gwendal@...omium.org>, Chao Yu <chao@...nel.org>,
        Ryo Hashimoto <hashimoto@...omium.org>,
        Vadim Sukhomlinov <sukhomlinov@...gle.com>,
        Guenter Roeck <groeck@...omium.org>, apronin@...omium.org,
        linux-doc@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Jonathan Corbet <corbet@....net>,
        LKML <linux-kernel@...r.kernel.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        linux-fscrypt@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH] Revert "ext4 crypto: fix to check feature status before
 get policy"

Hi,

On Wed, Oct 30, 2019 at 1:57 PM Eric Biggers <ebiggers@...nel.org> wrote:
>
> FWIW, from reading the Chrome OS code, I think the code you linked to isn't
> where the breakage actually is.  I think it's actually at
> https://chromium.googlesource.com/chromiumos/platform2/+/refs/heads/master/chromeos-common-script/share/chromeos-common.sh#375
> ... where an init script is using the error message printed by 'e4crypt
> get_policy' to decide whether to add -O encrypt to the filesystem or not.
>
> It really should check instead:
>
>         [ -e /sys/fs/ext4/features/encryption ]

OK, I filed <https://crbug.com/1019939> and CCed all the people listed
in the cryptohome "OWNERS" file.  Hopefully one of them can pick this
up as a general cleanup.  Thanks!

-Doug