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eCryptfs: move ecryptfs_find_auth_tok_for_sig() call before mutex_lock 

The ecryptfs_find_auth_tok_for_sig() call is moved before the
mutex_lock(s->tfm_mutex) instruction in order to avoid possible deadlocks
that may occur by holding the lock on the two semaphores 'key->sem' and
's->tfm_mutex' in reverse order.

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
This commit is contained in:
Roberto Sassu 2011-03-21 16:00:54 +01:00 committed by Tyler Hicks
parent 0e1fc5ef47
commit 950983fc04
1 changed files with 19 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
fs/ecryptfs/keystore.c
View File

@ -635,6 +635,16 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
}
s->desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
(*packet_size) = 0;
rc = ecryptfs_find_auth_tok_for_sig(
&auth_tok_key,
&s->auth_tok, mount_crypt_stat,
mount_crypt_stat->global_default_fnek_sig);
if (rc) {
printk(KERN_ERR "%s: Error attempting to find auth tok for "
"fnek sig [%s]; rc = [%d]\n", __func__,
mount_crypt_stat->global_default_fnek_sig, rc);
goto out;
}
rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(
&s->desc.tfm,
&s->tfm_mutex, mount_crypt_stat->global_default_fn_cipher_name);
@ -720,16 +730,6 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
goto out_free_unlock;
}
dest[s->i++] = s->cipher_code;
rc = ecryptfs_find_auth_tok_for_sig(
&auth_tok_key,
&s->auth_tok, mount_crypt_stat,
mount_crypt_stat->global_default_fnek_sig);
if (rc) {
printk(KERN_ERR "%s: Error attempting to find auth tok for "
"fnek sig [%s]; rc = [%d]\n", __func__,
mount_crypt_stat->global_default_fnek_sig, rc);
goto out_free_unlock;
}
/* TODO: Support other key modules than passphrase for
* filename encryption */
if (s->auth_tok->token_type != ECRYPTFS_PASSWORD) {
@ -983,6 +983,15 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
__func__, s->cipher_code);
goto out;
}
rc = ecryptfs_find_auth_tok_for_sig(&auth_tok_key,
&s->auth_tok, mount_crypt_stat,
s->fnek_sig_hex);
if (rc) {
printk(KERN_ERR "%s: Error attempting to find auth tok for "
"fnek sig [%s]; rc = [%d]\n", __func__, s->fnek_sig_hex,
rc);
goto out;
}
rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&s->desc.tfm,
&s->tfm_mutex,
s->cipher_string);
@ -1029,15 +1038,6 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
* >= ECRYPTFS_MAX_IV_BYTES. */
memset(s->iv, 0, ECRYPTFS_MAX_IV_BYTES);
s->desc.info = s->iv;
rc = ecryptfs_find_auth_tok_for_sig(&auth_tok_key,
&s->auth_tok, mount_crypt_stat,
s->fnek_sig_hex);
if (rc) {
printk(KERN_ERR "%s: Error attempting to find auth tok for "
"fnek sig [%s]; rc = [%d]\n", __func__, s->fnek_sig_hex,
rc);
goto out_free_unlock;
}
/* TODO: Support other key modules than passphrase for
* filename encryption */
if (s->auth_tok->token_type != ECRYPTFS_PASSWORD) {