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author | 2015-10-21 14:04:48 +0100 | |
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committer | 2015-10-21 15:18:36 +0100 | |
commit | 146aa8b1453bd8f1ff2304ffb71b4ee0eb9acdcc (patch) | |
tree | a89ef2cd2e8029b0c09a58739cca0e7e2e68f4db /security/keys/big_key.c | |
parent | KEYS: Provide a script to extract a module signature (diff) | |
download | linux-dev-146aa8b1453bd8f1ff2304ffb71b4ee0eb9acdcc.tar.xz linux-dev-146aa8b1453bd8f1ff2304ffb71b4ee0eb9acdcc.zip |
KEYS: Merge the type-specific data with the payload data
Merge the type-specific data with the payload data into one four-word chunk
as it seems pointless to keep them separate.
Use user_key_payload() for accessing the payloads of overloaded
user-defined keys.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cifs@vger.kernel.org
cc: ecryptfs@vger.kernel.org
cc: linux-ext4@vger.kernel.org
cc: linux-f2fs-devel@lists.sourceforge.net
cc: linux-nfs@vger.kernel.org
cc: ceph-devel@vger.kernel.org
cc: linux-ima-devel@lists.sourceforge.net
Diffstat (limited to 'security/keys/big_key.c')
-rw-r--r-- | security/keys/big_key.c | 47 |
1 files changed, 31 insertions, 16 deletions
diff --git a/security/keys/big_key.c b/security/keys/big_key.c index b6adb94f6d52..907c1522ee46 100644 --- a/security/keys/big_key.c +++ b/security/keys/big_key.c @@ -21,6 +21,16 @@ MODULE_LICENSE("GPL"); /* + * Layout of key payload words. + */ +enum { + big_key_data, + big_key_path, + big_key_path_2nd_part, + big_key_len, +}; + +/* * If the data is under this limit, there's no point creating a shm file to * hold it as the permanently resident metadata for the shmem fs will be at * least as large as the data. @@ -47,7 +57,7 @@ struct key_type key_type_big_key = { */ int big_key_preparse(struct key_preparsed_payload *prep) { - struct path *path = (struct path *)&prep->payload; + struct path *path = (struct path *)&prep->payload.data[big_key_path]; struct file *file; ssize_t written; size_t datalen = prep->datalen; @@ -60,7 +70,7 @@ int big_key_preparse(struct key_preparsed_payload *prep) /* Set an arbitrary quota */ prep->quotalen = 16; - prep->type_data[1] = (void *)(unsigned long)datalen; + prep->payload.data[big_key_len] = (void *)(unsigned long)datalen; if (datalen > BIG_KEY_FILE_THRESHOLD) { /* Create a shmem file to store the data in. This will permit the data @@ -94,7 +104,8 @@ int big_key_preparse(struct key_preparsed_payload *prep) if (!data) return -ENOMEM; - prep->payload[0] = memcpy(data, prep->data, prep->datalen); + prep->payload.data[big_key_data] = data; + memcpy(data, prep->data, prep->datalen); } return 0; @@ -110,10 +121,10 @@ error: void big_key_free_preparse(struct key_preparsed_payload *prep) { if (prep->datalen > BIG_KEY_FILE_THRESHOLD) { - struct path *path = (struct path *)&prep->payload; + struct path *path = (struct path *)&prep->payload.data[big_key_path]; path_put(path); } else { - kfree(prep->payload[0]); + kfree(prep->payload.data[big_key_data]); } } @@ -123,11 +134,12 @@ void big_key_free_preparse(struct key_preparsed_payload *prep) */ void big_key_revoke(struct key *key) { - struct path *path = (struct path *)&key->payload.data2; + struct path *path = (struct path *)&key->payload.data[big_key_path]; /* clear the quota */ key_payload_reserve(key, 0); - if (key_is_instantiated(key) && key->type_data.x[1] > BIG_KEY_FILE_THRESHOLD) + if (key_is_instantiated(key) && + (size_t)key->payload.data[big_key_len] > BIG_KEY_FILE_THRESHOLD) vfs_truncate(path, 0); } @@ -136,14 +148,16 @@ void big_key_revoke(struct key *key) */ void big_key_destroy(struct key *key) { - if (key->type_data.x[1] > BIG_KEY_FILE_THRESHOLD) { - struct path *path = (struct path *)&key->payload.data2; + size_t datalen = (size_t)key->payload.data[big_key_len]; + + if (datalen) { + struct path *path = (struct path *)&key->payload.data[big_key_path]; path_put(path); path->mnt = NULL; path->dentry = NULL; } else { - kfree(key->payload.data); - key->payload.data = NULL; + kfree(key->payload.data[big_key_data]); + key->payload.data[big_key_data] = NULL; } } @@ -152,12 +166,12 @@ void big_key_destroy(struct key *key) */ void big_key_describe(const struct key *key, struct seq_file *m) { - unsigned long datalen = key->type_data.x[1]; + size_t datalen = (size_t)key->payload.data[big_key_len]; seq_puts(m, key->description); if (key_is_instantiated(key)) - seq_printf(m, ": %lu [%s]", + seq_printf(m, ": %zu [%s]", datalen, datalen > BIG_KEY_FILE_THRESHOLD ? "file" : "buff"); } @@ -168,14 +182,14 @@ void big_key_describe(const struct key *key, struct seq_file *m) */ long big_key_read(const struct key *key, char __user *buffer, size_t buflen) { - unsigned long datalen = key->type_data.x[1]; + size_t datalen = (size_t)key->payload.data[big_key_len]; long ret; if (!buffer || buflen < datalen) return datalen; if (datalen > BIG_KEY_FILE_THRESHOLD) { - struct path *path = (struct path *)&key->payload.data2; + struct path *path = (struct path *)&key->payload.data[big_key_path]; struct file *file; loff_t pos; @@ -190,7 +204,8 @@ long big_key_read(const struct key *key, char __user *buffer, size_t buflen) ret = -EIO; } else { ret = datalen; - if (copy_to_user(buffer, key->payload.data, datalen) != 0) + if (copy_to_user(buffer, key->payload.data[big_key_data], + datalen) != 0) ret = -EFAULT; } |