linux-ext4 - Re: [PATCH v4 2/4] fscrypt: add inline encryption support

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Date:   Wed, 8 Jul 2020 13:14:28 -0400
From:   tytso@....edu
To:     Satya Tangirala <satyat@...gle.com>
Cc:     linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-ext4@...r.kernel.org,
        Eric Biggers <ebiggers@...gle.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>
Subject: Re: [PATCH v4 2/4] fscrypt: add inline encryption support

On Thu, Jul 02, 2020 at 01:56:05AM +0000, Satya Tangirala wrote:
> Add support for inline encryption to fs/crypto/.  With "inline
> encryption", the block layer handles the decryption/encryption as part
> of the bio, instead of the filesystem doing the crypto itself via
> Linux's crypto API. This model is needed in order to take advantage of
> the inline encryption hardware present on most modern mobile SoCs.
> 
> To use inline encryption, the filesystem needs to be mounted with
> '-o inlinecrypt'. Blk-crypto will then be used instead of the traditional
> filesystem-layer crypto whenever possible to encrypt the contents
> of any encrypted files in that filesystem. Fscrypt still provides the key
> and IV to use, and the actual ciphertext on-disk is still the same;
> therefore it's testable using the existing fscrypt ciphertext verification
> tests.
> 
> Note that since blk-crypto has a fallback to Linux's crypto API, and
> also supports all the encryption modes currently supported by fscrypt,
> this feature is usable and testable even without actual inline
> encryption hardware.
> 
> Per-filesystem changes will be needed to set encryption contexts when
> submitting bios and to implement the 'inlinecrypt' mount option.  This
> patch just adds the common code.
> 
> Co-developed-by: Eric Biggers <ebiggers@...gle.com>
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>
> Signed-off-by: Satya Tangirala <satyat@...gle.com>
> Reviewed-by: Jaegeuk Kim <jaegeuk@...nel.org>
> Reviewed-by: Eric Biggers <ebiggers@...gle.com>

Reviewed-by: Theodore Ts'o <tytso@....edu>