5 files changed, 55 insertions, 12 deletions

diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 40186b959429..413a3c48f0bb 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -377,6 +377,7 @@ struct ecryptfs_mount_crypt_stat {
 #define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES      0x00000010
 #define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK   0x00000020
 #define ECRYPTFS_GLOBAL_ENCFN_USE_FEK          0x00000040
+#define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY    0x00000080
         u32 flags;
         struct list_head global_auth_tok_list;
         struct mutex global_auth_tok_list_mutex;
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 3fbc94203380..9d1a22d62765 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -32,6 +32,7 @@
 #include <linux/crypto.h>
 #include <linux/fs_stack.h>
 #include <linux/slab.h>
+#include <linux/xattr.h>
 #include <asm/unaligned.h>
 #include "ecryptfs_kernel.h"
 
@@ -70,15 +71,19 @@ ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
         struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
         struct dentry *dentry_save;
         struct vfsmount *vfsmount_save;
+        unsigned int flags_save;
         int rc;
 
         dentry_save = nd->path.dentry;
         vfsmount_save = nd->path.mnt;
+        flags_save = nd->flags;
         nd->path.dentry = lower_dentry;
         nd->path.mnt = lower_mnt;
+        nd->flags &= ~LOOKUP_OPEN;
         rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
         nd->path.dentry = dentry_save;
         nd->path.mnt = vfsmount_save;
+        nd->flags = flags_save;
         return rc;
 }
 
@@ -1108,10 +1113,8 @@ ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
                 rc = -EOPNOTSUPP;
                 goto out;
         }
-        mutex_lock(&lower_dentry->d_inode->i_mutex);
-        rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
-                                                   size, flags);
-        mutex_unlock(&lower_dentry->d_inode->i_mutex);
+
+        rc = vfs_setxattr(lower_dentry, name, value, size, flags);
 out:
         return rc;
 }
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index 73811cfa2ea4..b1f6858a5223 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -446,6 +446,7 @@ out:
  */
 static int
 ecryptfs_find_auth_tok_for_sig(
+        struct key **auth_tok_key,
         struct ecryptfs_auth_tok **auth_tok,
         struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
         char *sig)
@@ -453,12 +454,21 @@ ecryptfs_find_auth_tok_for_sig(
         struct ecryptfs_global_auth_tok *global_auth_tok;
         int rc = 0;
 
+        (*auth_tok_key) = NULL;
         (*auth_tok) = NULL;
         if (ecryptfs_find_global_auth_tok_for_sig(&global_auth_tok,
                                                   mount_crypt_stat, sig)) {
-                struct key *auth_tok_key;
 
-                rc = ecryptfs_keyring_auth_tok_for_sig(&auth_tok_key, auth_tok,
+                /* if the flag ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY is set in the
+                 * mount_crypt_stat structure, we prevent to use auth toks that
+                 * are not inserted through the ecryptfs_add_global_auth_tok
+                 * function.
+                 */
+                if (mount_crypt_stat->flags
+                                & ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY)
+                        return -EINVAL;
+
+                rc = ecryptfs_keyring_auth_tok_for_sig(auth_tok_key, auth_tok,
                                                        sig);
         } else
                 (*auth_tok) = global_auth_tok->global_auth_tok;
@@ -509,6 +519,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
                              char *filename, size_t filename_size)
 {
         struct ecryptfs_write_tag_70_packet_silly_stack *s;
+        struct key *auth_tok_key = NULL;
         int rc = 0;
 
         s = kmalloc(sizeof(*s), GFP_KERNEL);
@@ -606,6 +617,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
         }
         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) {
@@ -753,6 +765,8 @@ out_free_unlock:
 out_unlock:
         mutex_unlock(s->tfm_mutex);
 out:
+        if (auth_tok_key)
+                key_put(auth_tok_key);
         kfree(s);
         return rc;
 }
@@ -798,6 +812,7 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
                              char *data, size_t max_packet_size)
 {
         struct ecryptfs_parse_tag_70_packet_silly_stack *s;
+        struct key *auth_tok_key = NULL;
         int rc = 0;
 
         (*packet_size) = 0;
@@ -910,7 +925,8 @@ 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(&s->auth_tok, mount_crypt_stat,
+        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 "
@@ -986,6 +1002,8 @@ out:
                 (*filename_size) = 0;
                 (*filename) = NULL;
         }
+        if (auth_tok_key)
+                key_put(auth_tok_key);
         kfree(s);
         return rc;
 }
@@ -1557,14 +1575,19 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
                        ECRYPTFS_VERSION_MAJOR,
                        ECRYPTFS_VERSION_MINOR);
                 rc = -EINVAL;
-                goto out;
+                goto out_release_key;
         }
         if ((*auth_tok)->token_type != ECRYPTFS_PASSWORD
             && (*auth_tok)->token_type != ECRYPTFS_PRIVATE_KEY) {
                 printk(KERN_ERR "Invalid auth_tok structure "
                        "returned from key query\n");
                 rc = -EINVAL;
-                goto out;
+                goto out_release_key;
+        }
+out_release_key:
+        if (rc) {
+                key_put(*auth_tok_key);
+                (*auth_tok_key) = NULL;
         }
 out:
         return rc;
@@ -1688,6 +1711,7 @@ int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
         struct ecryptfs_auth_tok_list_item *auth_tok_list_item;
         size_t tag_11_contents_size;
         size_t tag_11_packet_size;
+        struct key *auth_tok_key = NULL;
         int rc = 0;
 
         INIT_LIST_HEAD(&auth_tok_list);
@@ -1784,6 +1808,10 @@ int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
          * just one will be sufficient to decrypt to get the FEK. */
 find_next_matching_auth_tok:
         found_auth_tok = 0;
+        if (auth_tok_key) {
+                key_put(auth_tok_key);
+                auth_tok_key = NULL;
+        }
         list_for_each_entry(auth_tok_list_item, &auth_tok_list, list) {
                 candidate_auth_tok = &auth_tok_list_item->auth_tok;
                 if (unlikely(ecryptfs_verbosity > 0)) {
@@ -1800,10 +1828,11 @@ find_next_matching_auth_tok:
                         rc = -EINVAL;
                         goto out_wipe_list;
                 }
-                ecryptfs_find_auth_tok_for_sig(&matching_auth_tok,
+                rc = ecryptfs_find_auth_tok_for_sig(&auth_tok_key,
+                                               &matching_auth_tok,
                                                crypt_stat->mount_crypt_stat,
                                                candidate_auth_tok_sig);
-                if (matching_auth_tok) {
+                if (!rc) {
                         found_auth_tok = 1;
                         goto found_matching_auth_tok;
                 }
@@ -1866,6 +1895,8 @@ found_matching_auth_tok:
 out_wipe_list:
         wipe_auth_tok_list(&auth_tok_list);
 out:
+        if (auth_tok_key)
+                key_put(auth_tok_key);
         return rc;
 }
 
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 8585934712d4..a9dbd62518e6 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -208,7 +208,8 @@ enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
        ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
        ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
        ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
-       ecryptfs_opt_unlink_sigs, ecryptfs_opt_err };
+       ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only,
+       ecryptfs_opt_err };
 
 static const match_table_t tokens = {
         {ecryptfs_opt_sig, "sig=%s"},
@@ -223,6 +224,7 @@ static const match_table_t tokens = {
         {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
         {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_err, NULL}
 };
 
@@ -406,6 +408,10 @@ static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options)
                 case ecryptfs_opt_unlink_sigs:
                         mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
                         break;
+                case ecryptfs_opt_mount_auth_tok_only:
+                        mount_crypt_stat->flags |=
+                                ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
+                        break;
                 case ecryptfs_opt_err:
                 default:
                         printk(KERN_WARNING
diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
index f7fc286a3aa9..253732382d37 100644
--- a/fs/ecryptfs/super.c
+++ b/fs/ecryptfs/super.c
@@ -180,6 +180,8 @@ static int ecryptfs_show_options(struct seq_file *m, struct vfsmount *mnt)
                 seq_printf(m, ",ecryptfs_encrypted_view");
         if (mount_crypt_stat->flags & ECRYPTFS_UNLINK_SIGS)
                 seq_printf(m, ",ecryptfs_unlink_sigs");
+        if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY)
+                seq_printf(m, ",ecryptfs_mount_auth_tok_only");
 
         return 0;
 }