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ecryptfs: improved dependency checking and reporting

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So, I compiled a 2.6.31-rc5 kernel with ecryptfs and loaded its module.
When it came time to mount my filesystem, I got this in dmesg, and it
refused to mount:

[93577.776637] Unable to allocate crypto cipher with name [aes]; rc = [-2]
[93577.783280] Error attempting to initialize key TFM cipher with name = [aes]; rc = [-2]
[93577.791183] Error attempting to initialize cipher with name = [aes] and key size = [32]; rc = [-2]
[93577.800113] Error parsing options; rc = [-22]

I figured from the error message that I'd either forgotten to load "aes"
or that my key size was bogus.  Neither one of those was the case.  In
fact, I was missing the CRYPTO_ECB config option and the 'ecb' module.
Unfortunately, there's no trace of 'ecb' in that error message.

I've done two things to fix this.  First, I've modified ecryptfs's
Kconfig entry to select CRYPTO_ECB and CRYPTO_CBC.  I also took CRYPTO
out of the dependencies since the 'select' will take care of it for us.

I've also modified the error messages to print a string that should
contain both 'ecb' and 'aes' in my error case.  That will give any
future users a chance of finding the right modules and Kconfig options.

I also wonder if we should:

	select CRYPTO_AES if !EMBEDDED

since I think most ecryptfs users are using AES like me.

Cc: ecryptfs-devel@lists.launchpad.net
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Dustin Kirkland <kirkland@canonical.com>
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
[tyhicks@linux.vnet.ibm.com: Removed extra newline, 80-char violation]
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
This commit is contained in:
Dave Hansen 2009-08-27 09:47:07 -07:00 committed by Tyler Hicks
parent aa06117f19
commit 382684984e
2 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
fs/ecryptfs/Kconfig
View file

@ -1,6 +1,8 @@
config ECRYPT_FS
tristate "eCrypt filesystem layer support (EXPERIMENTAL)"
depends on EXPERIMENTAL && KEYS && CRYPTO && NET
depends on EXPERIMENTAL && KEYS && NET
select CRYPTO_ECB
select CRYPTO_CBC
help
Encrypted filesystem that operates on the VFS layer. See
<file:Documentation/filesystems/ecryptfs.txt> to learn more about

5
fs/ecryptfs/crypto.c
View file

@ -1763,7 +1763,7 @@ ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
if (IS_ERR(*key_tfm)) {
rc = PTR_ERR(*key_tfm);
printk(KERN_ERR "Unable to allocate crypto cipher with name "
"[%s]; rc = [%d]\n", cipher_name, rc);
"[%s]; rc = [%d]\n", full_alg_name, rc);
goto out;
}
crypto_blkcipher_set_flags(*key_tfm, CRYPTO_TFM_REQ_WEAK_KEY);
@ -1776,7 +1776,8 @@ ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
rc = crypto_blkcipher_setkey(*key_tfm, dummy_key, *key_size);
if (rc) {
printk(KERN_ERR "Error attempting to set key of size [%zd] for "
"cipher [%s]; rc = [%d]\n", *key_size, cipher_name, rc);
"cipher [%s]; rc = [%d]\n", *key_size, full_alg_name,
rc);
rc = -EINVAL;
goto out;
}