diff options
| author | Tim Sally <tsally@atomicpeace.com> | 2012-07-12 19:10:24 -0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-11-16 16:47:19 +0000 |
| commit | 50a2114dde86ea598918716f1b44fdc88f3692d8 (patch) | |
| tree | bb556d71d2fc4921989a59d2665d2a27eee75741 | |
| parent | 916fef09cb43ee4aad40129b3f9e3fd4bb1c641f (diff) | |
| download | linux-stable-50a2114dde86ea598918716f1b44fdc88f3692d8.tar.gz linux-stable-50a2114dde86ea598918716f1b44fdc88f3692d8.tar.bz2 linux-stable-50a2114dde86ea598918716f1b44fdc88f3692d8.zip | |
eCryptfs: check for eCryptfs cipher support at mount
commit 5f5b331d5c21228a6519dcb793fc1629646c51a6 upstream.
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@atomicpeace.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | fs/ecryptfs/main.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c index bf961095e2c0..94afdfd958f4 100644 --- a/fs/ecryptfs/main.c +++ b/fs/ecryptfs/main.c @@ -280,6 +280,7 @@ 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; @@ -421,6 +422,18 @@ 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)) { |