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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6

Browse Source 
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6:
  Ecryptfs: Add mount option to check uid of device being mounted = expect uid
  eCryptfs: Fix payload_len unitialized variable warning
  eCryptfs: fix compile error
  eCryptfs: Return error when lower file pointer is NULL
This commit is contained in:
Linus Torvalds 2011-08-10 11:08:06 -07:00
commit d55140ce3a
4 changed files with 33 additions and 12 deletions
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2
fs/ecryptfs/Kconfig
View File

@ -1,6 +1,6 @@
config ECRYPT_FS
tristate "eCrypt filesystem layer support (EXPERIMENTAL)"
depends on EXPERIMENTAL && KEYS && CRYPTO
depends on EXPERIMENTAL && KEYS && CRYPTO && (ENCRYPTED_KEYS || ENCRYPTED_KEYS=n)
select CRYPTO_ECB
select CRYPTO_CBC
select CRYPTO_MD5

2
fs/ecryptfs/keystore.c
View File

@ -1973,7 +1973,7 @@ pki_encrypt_session_key(struct key *auth_tok_key,
{
struct ecryptfs_msg_ctx *msg_ctx = NULL;
char *payload = NULL;
size_t payload_len;
size_t payload_len = 0;
struct ecryptfs_message *msg;
int rc;

23
fs/ecryptfs/main.c
View File

@ -175,6 +175,7 @@ enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only,
ecryptfs_opt_check_dev_ruid,
ecryptfs_opt_err };
static const match_table_t tokens = {
@ -191,6 +192,7 @@ static const match_table_t tokens = {
{ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
{ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
{ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"},
{ecryptfs_opt_check_dev_ruid, "ecryptfs_check_dev_ruid"},
{ecryptfs_opt_err, NULL}
};
@ -236,6 +238,7 @@ static void ecryptfs_init_mount_crypt_stat(
* ecryptfs_parse_options
* @sb: The ecryptfs super block
* @options: The options passed to the kernel
* @check_ruid: set to 1 if device uid should be checked against the ruid
*
* Parse mount options:
* debug=N - ecryptfs_verbosity level for debug output
@ -251,7 +254,8 @@ static void ecryptfs_init_mount_crypt_stat(
*
* Returns zero on success; non-zero on error
*/
static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options)
static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
uid_t *check_ruid)
{
char *p;
int rc = 0;
@ -276,6 +280,8 @@ static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options)
char *cipher_key_bytes_src;
char *fn_cipher_key_bytes_src;
*check_ruid = 0;
if (!options) {
rc = -EINVAL;
goto out;
@ -380,6 +386,9 @@ static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options)
mount_crypt_stat->flags |=
ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
break;
case ecryptfs_opt_check_dev_ruid:
*check_ruid = 1;
break;
case ecryptfs_opt_err:
default:
printk(KERN_WARNING
@ -475,6 +484,7 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
const char *err = "Getting sb failed";
struct inode *inode;
struct path path;
uid_t check_ruid;
int rc;
sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
@ -483,7 +493,7 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
goto out;
}
rc = ecryptfs_parse_options(sbi, raw_data);
rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid);
if (rc) {
err = "Error parsing options";
goto out;
@ -521,6 +531,15 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
"known incompatibilities\n");
goto out_free;
}
if (check_ruid && path.dentry->d_inode->i_uid != current_uid()) {
rc = -EPERM;
printk(KERN_ERR "Mount of device (uid: %d) not owned by "
"requested user (uid: %d)\n",
path.dentry->d_inode->i_uid, current_uid());
goto out_free;
}
ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
s->s_blocksize = path.dentry->d_sb->s_blocksize;

18
fs/ecryptfs/read_write.c
View File

@ -39,15 +39,16 @@
int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
loff_t offset, size_t size)
{
struct ecryptfs_inode_info *inode_info;
struct file *lower_file;
mm_segment_t fs_save;
ssize_t rc;
inode_info = ecryptfs_inode_to_private(ecryptfs_inode);
BUG_ON(!inode_info->lower_file);
lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;
if (!lower_file)
return -EIO;
fs_save = get_fs();
set_fs(get_ds());
rc = vfs_write(inode_info->lower_file, data, size, &offset);
rc = vfs_write(lower_file, data, size, &offset);
set_fs(fs_save);
mark_inode_dirty_sync(ecryptfs_inode);
return rc;
@ -225,15 +226,16 @@ out:
int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
struct inode *ecryptfs_inode)
{
struct ecryptfs_inode_info *inode_info =
ecryptfs_inode_to_private(ecryptfs_inode);
struct file *lower_file;
mm_segment_t fs_save;
ssize_t rc;
BUG_ON(!inode_info->lower_file);
lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;
if (!lower_file)
return -EIO;
fs_save = get_fs();
set_fs(get_ds());
rc = vfs_read(inode_info->lower_file, data, size, &offset);
rc = vfs_read(lower_file, data, size, &offset);
set_fs(fs_save);
return rc;
}