linux-kernel - Re: [PATCH 1/1] eCryptfs: check for eCryptfs cipher support at mount

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Date:	Fri, 13 Jul 2012 17:24:49 -0700
From:	Tyler Hicks <tyhicks@...onical.com>
To:	Tim Sally <tsally@...micpeace.com>
Cc:	dustin.kirkland@...zang.com, ecryptfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] eCryptfs: check for eCryptfs cipher support at mount

On 2012-07-12 19:10:24, Tim Sally wrote:
> The issue occurs when eCryptfs is mounted with a cipher supported by
> the crypto subsystem but not by eCryptfs. The mount succeeds and an
> error does not occur until a write. This change checks for eCryptfs
> cipher support at mount time.
> 
> Resolves Launchpad issue #338914, reported by Tyler Hicks in 03/2009.
> https://bugs.launchpad.net/ecryptfs/+bug/338914
> 
> Signed-off-by: Tim Sally <tsally@...micpeace.com>

Looks good! I've pushed it to the eCryptfs -next branch and it will go
in during the 3.6 merge window.

I'm looking forward to more eCryptfs patches from you. Thanks!

Tyler

> ---
>  fs/ecryptfs/main.c |   13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
> index df217dc..aee998d 100644
> --- a/fs/ecryptfs/main.c
> +++ b/fs/ecryptfs/main.c
> @@ -279,6 +279,7 @@ static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
>  	char *fnek_src;
>  	char *cipher_key_bytes_src;
>  	char *fn_cipher_key_bytes_src;
> +	u8 cipher_code;
>  
>  	*check_ruid = 0;
>  
> @@ -420,6 +421,18 @@ static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
>  	    && !fn_cipher_key_bytes_set)
>  		mount_crypt_stat->global_default_fn_cipher_key_bytes =
>  			mount_crypt_stat->global_default_cipher_key_size;
> +
> +	cipher_code = ecryptfs_code_for_cipher_string(
> +		mount_crypt_stat->global_default_cipher_name,
> +		mount_crypt_stat->global_default_cipher_key_size);
> +	if (!cipher_code) {
> +		ecryptfs_printk(KERN_ERR,
> +				"eCryptfs doesn't support cipher: %s.",
> +				mount_crypt_stat->global_default_cipher_name);
> +		rc = -EINVAL;
> +		goto out;
> +	}
> +
>  	mutex_lock(&key_tfm_list_mutex);
>  	if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
>  				 NULL)) {
> -- 
> 1.7.10.4
> 
> --
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