linux-kernel - Re: [PATCH 4.4 34/46] crypto: xts

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Date:   Fri, 10 Nov 2017 20:40:53 +0000
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Milan Broz <gmazyland@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: Re: [PATCH 4.4 34/46] crypto: xts - Add ECB dependency

On Thu, 2017-10-19 at 15:49 +0200, Greg Kroah-Hartman wrote:
> 4.4-stable review patch.  If anyone has any objections, please let me
> know.
> 
> ------------------
> 
> From: Milan Broz <gmazyland@...il.com>
> 
> 
> [ Upstream commit 12cb3a1c4184f891d965d1f39f8cfcc9ef617647 ]
> 
> Since the
>    commit f1c131b45410a202eb45cc55980a7a9e4e4b4f40
>    crypto: xts - Convert to skcipher

That commit went into 4.10, and not any stable branches.  So this fix
doesn't appear to be appropriate for the older branches it was applied
to.

Ben.

> the XTS mode is based on ECB, so the mode must select
> ECB otherwise it can fail to initialize.
> 
> Signed-off-by: Milan Broz <gmazyland@...il.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  crypto/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> --- a/crypto/Kconfig
> +++ b/crypto/Kconfig
> @@ -343,6 +343,7 @@ config CRYPTO_XTS
>  	select CRYPTO_BLKCIPHER
>  	select CRYPTO_MANAGER
>  	select CRYPTO_GF128MUL
> +	select CRYPTO_ECB
>  	help
>  	  XTS: IEEE1619/D16 narrow block cipher use with aes-xts-
> plain,
>  	  key size 256, 384 or 512 bits. This implementation
> currently
> 
> 
> 
-- 
Ben Hutchings
Software Developer, Codethink Ltd.