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

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6:
  eCryptfs: Print mount_auth_tok_only param in ecryptfs_show_options
  ecryptfs: added ecryptfs_mount_auth_tok_only mount parameter
  ecryptfs: checking return code of ecryptfs_find_auth_tok_for_sig()
  ecryptfs: release keys loaded in ecryptfs_keyring_auth_tok_for_sig()
  eCryptfs: Clear LOOKUP_OPEN flag when creating lower file
  ecryptfs: call vfs_setxattr() in ecryptfs_setxattr()

5 files changed, 55 insertions, 12 deletions

diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 40186b9..413a3c4 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 3fbc942..9d1a22d 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 73811cf..b1f6858 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 8585934..a9dbd62 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 f7fc286..2537323 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;
 }