linux-kernel - Re: [PATCH] eCryptfs: fix compile error

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Date:	Fri, 29 Jul 2011 12:09:32 -0500
From:	Tyler Hicks <tyhicks@...ux.vnet.ibm.com>
To:	Roberto Sassu <roberto.sassu@...ito.it>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	kirkland@...onical.com, ecryptfs-devel@...ts.launchpad.net,
	hilld@...arystorm.net
Subject: Re: [PATCH] eCryptfs: fix compile error

On Fri Jul 29, 2011 at 06:51:04PM +0200, Roberto Sassu <roberto.sassu@...ito.it> wrote:
> This patch fixes the compile error reported at the address:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=40292
> 
> The problem arises when compiling eCryptfs as built-in and the 'encrypted'
> key type as a module. The patch enables the 'encrypted' key type support
> for eCryptfs only when both components are compiled as built-in, both as
> modules or eCryptfs as a module and the 'encrypted' key type as built-in.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
> Reported-by: David Hill <hilld@...arystorm.net>
> ---
>  fs/ecryptfs/ecryptfs_kernel.h |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
> index b36c557..a2da660 100644
> --- a/fs/ecryptfs/ecryptfs_kernel.h
> +++ b/fs/ecryptfs/ecryptfs_kernel.h
> @@ -79,7 +79,9 @@ struct ecryptfs_page_crypt_context {
>  	} param;
>  };
> 
> -#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
> +#if (defined(CONFIG_ECRYPT_FS) && defined(CONFIG_ENCRYPTED_KEYS)) || \
> +	(defined(CONFIG_ECRYPT_FS_MODULE) && \
> +	(defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)))

Thanks for the patch, Roberto.

Shouldn't this be handled in the Kconfig? It seems like it would be
better to force the encrypted key type to be built-in if eCryptfs is
configured to be built-in.

With this patch, a user could have CONFIG_ENCRYPTED_KEYS=m and
CONFIG_ECRYPT_FS=y, but still hit potentially confusing error conditions
when trying to use encrypted key support with eCryptfs.

Tyler

>  static inline struct ecryptfs_auth_tok *
>  ecryptfs_get_encrypted_key_payload_data(struct key *key)
>  {
> -- 
> 1.7.6
> 


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