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From:   Andreas Dilger <adilger@dilger.ca>
Message-Id: <0399B7C7-D6A1-4A92-ABDD-1EA13C80007E@dilger.ca>
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Subject: Re: [PATCH v2 1/2] ext4: Handle casefolding with encryption
Date:   Sat, 20 Mar 2021 03:05:54 -0600
In-Reply-To: <20210319073414.1381041-2-drosen@google.com>
Cc:     "Theodore Y . Ts'o" <tytso@mit.edu>,
        Eric Biggers <ebiggers@kernel.org>,
        Ext4 Developers List <linux-ext4@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Gabriel Krisman Bertazi <krisman@collabora.com>,
        kernel-team@android.com
To:     Daniel Rosenberg <drosen@google.com>
References: <20210319073414.1381041-1-drosen@google.com>
 <20210319073414.1381041-2-drosen@google.com>
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On Mar 19, 2021, at 1:34 AM, Daniel Rosenberg <drosen@google.com> wrote:
> 
> This adds support for encryption with casefolding.
> 
> Since the name on disk is case preserving, and also encrypted, we can no
> longer just recompute the hash on the fly. Additionally, to avoid
> leaking extra information from the hash of the unencrypted name, we use
> siphash via an fscrypt v2 policy.
> 
> The hash is stored at the end of the directory entry for all entries
> inside of an encrypted and casefolded directory apart from those that
> deal with '.' and '..'. This way, the change is backwards compatible
> with existing ext4 filesystems.
> 
> Signed-off-by: Daniel Rosenberg <drosen@google.com>

Reviewed-by: Andreas Dilger <adilger@dilger.ca>

Cheers, Andreas


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