linux-ext4 - Re: [PATCH] fscrypt: add a documentation file for filesystem-level encryption

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Message-ID: <20170822025545.GA3577@zzz.localdomain>
Date:   Mon, 21 Aug 2017 19:55:45 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     Anand Jain <anand.jain@...cle.com>
Cc:     linux-fscrypt@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Richard Weinberger <richard@....at>,
        Michael Halcrow <mhalcrow@...gle.com>,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH] fscrypt: add a documentation file for filesystem-level
 encryption

On Tue, Aug 22, 2017 at 10:22:30AM +0800, Anand Jain wrote:
> 
> Hi Eric,
> 
>   How about a section on the threat model specific to the file-name ?
> 
>   (Sorry if I am missing something).
> 
> Thanks, Anand

It's already mentioned that filenames are encrypted: "fscrypt protects the
confidentiality of file contents and filenames in the event of a single
point-in-time permanent offline compromise of the block device content."
There's not much more to it than that; all the other points in the "Threat
model" section (offline manipulations, timing attacks, access control, key
eviction, etc.) are essentially the same between contents and filenames
encryption.

Eric