Merge commit 'v2.6.29' into x86/setup-lzma

6 files changed, 66 insertions, 44 deletions

diff --git a/fs/ecryptfs/Kconfig b/fs/ecryptfs/Kconfig
new file mode 100644
index 00000000000..0c754e64232
--- /dev/null
+++ b/fs/ecryptfs/Kconfig
@@ -0,0 +1,11 @@
+config ECRYPT_FS
+	tristate "eCrypt filesystem layer support (EXPERIMENTAL)"
+	depends on EXPERIMENTAL && KEYS && CRYPTO && NET
+	help
+	  Encrypted filesystem that operates on the VFS layer.  See
+	  <file:Documentation/filesystems/ecryptfs.txt> to learn more about
+	  eCryptfs.  Userspace components are required and can be
+	  obtained from <http://ecryptfs.sf.net>.
+
+	  To compile this file system support as a module, choose M here: the
+	  module will be called ecryptfs.
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index c01e043670e..8b65f289ee0 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -946,6 +946,8 @@ static int ecryptfs_copy_mount_wide_sigs_to_inode_sigs(
 	list_for_each_entry(global_auth_tok,
 			    &mount_crypt_stat->global_auth_tok_list,
 			    mount_crypt_stat_list) {
+		if (global_auth_tok->flags & ECRYPTFS_AUTH_TOK_FNEK)
+			continue;
 		rc = ecryptfs_add_keysig(crypt_stat, global_auth_tok->sig);
 		if (rc) {
 			printk(KERN_ERR "Error adding keysig; rc = [%d]\n", rc);
@@ -1322,14 +1324,13 @@ static int ecryptfs_write_headers_virt(char *page_virt, size_t max,
 }
 
 static int
-ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt_stat,
-				    struct dentry *ecryptfs_dentry,
-				    char *virt)
+ecryptfs_write_metadata_to_contents(struct dentry *ecryptfs_dentry,
+				    char *virt, size_t virt_len)
 {
 	int rc;
 
 	rc = ecryptfs_write_lower(ecryptfs_dentry->d_inode, virt,
-				  0, crypt_stat->num_header_bytes_at_front);
+				  0, virt_len);
 	if (rc)
 		printk(KERN_ERR "%s: Error attempting to write header "
 		       "information to lower file; rc = [%d]\n", __func__,
@@ -1339,7 +1340,6 @@ ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt_stat,
 
 static int
 ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry,
-				 struct ecryptfs_crypt_stat *crypt_stat,
 				 char *page_virt, size_t size)
 {
 	int rc;
@@ -1349,6 +1349,17 @@ ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry,
 	return rc;
 }
 
+static unsigned long ecryptfs_get_zeroed_pages(gfp_t gfp_mask,
+					       unsigned int order)
+{
+	struct page *page;
+
+	page = alloc_pages(gfp_mask | __GFP_ZERO, order);
+	if (page)
+		return (unsigned long) page_address(page);
+	return 0;
+}
+
 /**
  * ecryptfs_write_metadata
  * @ecryptfs_dentry: The eCryptfs dentry
@@ -1365,7 +1376,9 @@ int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry)
 {
 	struct ecryptfs_crypt_stat *crypt_stat =
 		&ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
+	unsigned int order;
 	char *virt;
+	size_t virt_len;
 	size_t size = 0;
 	int rc = 0;
 
@@ -1381,33 +1394,35 @@ int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry)
 		rc = -EINVAL;
 		goto out;
 	}
+	virt_len = crypt_stat->num_header_bytes_at_front;
+	order = get_order(virt_len);
 	/* Released in this function */
-	virt = (char *)get_zeroed_page(GFP_KERNEL);
+	virt = (char *)ecryptfs_get_zeroed_pages(GFP_KERNEL, order);
 	if (!virt) {
 		printk(KERN_ERR "%s: Out of memory\n", __func__);
 		rc = -ENOMEM;
 		goto out;
 	}
-	rc = ecryptfs_write_headers_virt(virt, PAGE_CACHE_SIZE, &size,
-					 crypt_stat, ecryptfs_dentry);
+	rc = ecryptfs_write_headers_virt(virt, virt_len, &size, crypt_stat,
+					 ecryptfs_dentry);
 	if (unlikely(rc)) {
 		printk(KERN_ERR "%s: Error whilst writing headers; rc = [%d]\n",
 		       __func__, rc);
 		goto out_free;
 	}
 	if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
-		rc = ecryptfs_write_metadata_to_xattr(ecryptfs_dentry,
-						      crypt_stat, virt, size);
+		rc = ecryptfs_write_metadata_to_xattr(ecryptfs_dentry, virt,
+						      size);
 	else
-		rc = ecryptfs_write_metadata_to_contents(crypt_stat,
-							 ecryptfs_dentry, virt);
+		rc = ecryptfs_write_metadata_to_contents(ecryptfs_dentry, virt,
+							 virt_len);
 	if (rc) {
 		printk(KERN_ERR "%s: Error writing metadata out to lower file; "
 		       "rc = [%d]\n", __func__, rc);
 		goto out_free;
 	}
 out_free:
-	free_page((unsigned long)virt);
+	free_pages((unsigned long)virt, order);
 out:
 	return rc;
 }
@@ -1716,7 +1731,7 @@ static int ecryptfs_copy_filename(char **copied_name, size_t *copied_name_size,
 {
 	int rc = 0;
 
-	(*copied_name) = kmalloc((name_size + 2), GFP_KERNEL);
+	(*copied_name) = kmalloc((name_size + 1), GFP_KERNEL);
 	if (!(*copied_name)) {
 		rc = -ENOMEM;
 		goto out;
@@ -1726,7 +1741,7 @@ static int ecryptfs_copy_filename(char **copied_name, size_t *copied_name_size,
 						 * in printing out the
 						 * string in debug
 						 * messages */
-	(*copied_name_size) = (name_size + 1);
+	(*copied_name_size) = name_size;
 out:
 	return rc;
 }
@@ -2206,17 +2221,19 @@ int ecryptfs_decode_and_decrypt_filename(char **plaintext_name,
 					 struct dentry *ecryptfs_dir_dentry,
 					 const char *name, size_t name_size)
 {
+	struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
+		&ecryptfs_superblock_to_private(
+			ecryptfs_dir_dentry->d_sb)->mount_crypt_stat;
 	char *decoded_name;
 	size_t decoded_name_size;
 	size_t packet_size;
 	int rc = 0;
 
-	if ((name_size > ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE)
+	if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
+	    && !(mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
+	    && (name_size > ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE)
 	    && (strncmp(name, ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX,
 			ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE) == 0)) {
-		struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
-			&ecryptfs_superblock_to_private(
-				ecryptfs_dir_dentry->d_sb)->mount_crypt_stat;
 		const char *orig_name = name;
 		size_t orig_name_size = name_size;
 
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index c11fc95714a..ac749d4d644 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -328,6 +328,7 @@ struct ecryptfs_dentry_info {
  */
 struct ecryptfs_global_auth_tok {
 #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
+#define ECRYPTFS_AUTH_TOK_FNEK    0x00000002
 	u32 flags;
 	struct list_head mount_crypt_stat_list;
 	struct key *global_auth_tok_key;
@@ -619,7 +620,6 @@ int ecryptfs_interpose(struct dentry *hidden_dentry,
 		       u32 flags);
 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 					struct dentry *lower_dentry,
-					struct ecryptfs_crypt_stat *crypt_stat,
 					struct inode *ecryptfs_dir_inode,
 					struct nameidata *ecryptfs_nd);
 int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
@@ -696,7 +696,7 @@ ecryptfs_write_header_metadata(char *virt,
 int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
 int
 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
-			   char *sig);
+			   char *sig, u32 global_auth_tok_flags);
 int ecryptfs_get_global_auth_tok_for_sig(
 	struct ecryptfs_global_auth_tok **global_auth_tok,
 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 5697899a168..55b3145b807 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -246,7 +246,6 @@ out:
  */
 int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 					struct dentry *lower_dentry,
-					struct ecryptfs_crypt_stat *crypt_stat,
 					struct inode *ecryptfs_dir_inode,
 					struct nameidata *ecryptfs_nd)
 {
@@ -254,6 +253,7 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 	struct vfsmount *lower_mnt;
 	struct inode *lower_inode;
 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
+	struct ecryptfs_crypt_stat *crypt_stat;
 	char *page_virt = NULL;
 	u64 file_size;
 	int rc = 0;
@@ -314,6 +314,11 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
 			goto out_free_kmem;
 		}
 	}
+	crypt_stat = &ecryptfs_inode_to_private(
+					ecryptfs_dentry->d_inode)->crypt_stat;
+	/* TODO: lock for crypt_stat comparison */
+	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
+			ecryptfs_set_default_sizes(crypt_stat);
 	rc = ecryptfs_read_and_validate_header_region(page_virt,
 						      ecryptfs_dentry->d_inode);
 	if (rc) {
@@ -362,9 +367,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 {
 	char *encrypted_and_encoded_name = NULL;
 	size_t encrypted_and_encoded_name_size;
-	struct ecryptfs_crypt_stat *crypt_stat = NULL;
 	struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
-	struct ecryptfs_inode_info *inode_info;
 	struct dentry *lower_dir_dentry, *lower_dentry;
 	int rc = 0;
 
@@ -388,26 +391,15 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 	}
 	if (lower_dentry->d_inode)
 		goto lookup_and_interpose;
-	inode_info =  ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);
-	if (inode_info) {
-		crypt_stat = &inode_info->crypt_stat;
-		/* TODO: lock for crypt_stat comparison */
-		if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
-			ecryptfs_set_default_sizes(crypt_stat);
-	}
-	if (crypt_stat)
-		mount_crypt_stat = crypt_stat->mount_crypt_stat;
-	else
-		mount_crypt_stat = &ecryptfs_superblock_to_private(
-			ecryptfs_dentry->d_sb)->mount_crypt_stat;
-	if (!(crypt_stat && (crypt_stat->flags & ECRYPTFS_ENCRYPT_FILENAMES))
-	    && !(mount_crypt_stat && (mount_crypt_stat->flags
-				     & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
+	mount_crypt_stat = &ecryptfs_superblock_to_private(
+				ecryptfs_dentry->d_sb)->mount_crypt_stat;
+	if (!(mount_crypt_stat
+	    && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
 		goto lookup_and_interpose;
 	dput(lower_dentry);
 	rc = ecryptfs_encrypt_and_encode_filename(
 		&encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
-		crypt_stat, mount_crypt_stat, ecryptfs_dentry->d_name.name,
+		NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
 		ecryptfs_dentry->d_name.len);
 	if (rc) {
 		printk(KERN_ERR "%s: Error attempting to encrypt and encode "
@@ -426,7 +418,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
 	}
 lookup_and_interpose:
 	rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
-						 crypt_stat, ecryptfs_dir_inode,
+						 ecryptfs_dir_inode,
 						 ecryptfs_nd);
 	goto out;
 out_d_drop:
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index ff539420cc6..e4a6223c314 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -2375,7 +2375,7 @@ struct kmem_cache *ecryptfs_global_auth_tok_cache;
 
 int
 ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
-			     char *sig)
+			     char *sig, u32 global_auth_tok_flags)
 {
 	struct ecryptfs_global_auth_tok *new_auth_tok;
 	int rc = 0;
@@ -2389,6 +2389,7 @@ ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
 		goto out;
 	}
 	memcpy(new_auth_tok->sig, sig, ECRYPTFS_SIG_SIZE_HEX);
+	new_auth_tok->flags = global_auth_tok_flags;
 	new_auth_tok->sig[ECRYPTFS_SIG_SIZE_HEX] = '\0';
 	mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
 	list_add(&new_auth_tok->mount_crypt_stat_list,
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 789cf2e1be1..aed56c25539 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -319,7 +319,7 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
 		case ecryptfs_opt_ecryptfs_sig:
 			sig_src = args[0].from;
 			rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
-							  sig_src);
+							  sig_src, 0);
 			if (rc) {
 				printk(KERN_ERR "Error attempting to register "
 				       "global sig; rc = [%d]\n", rc);
@@ -370,7 +370,8 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
 				ECRYPTFS_SIG_SIZE_HEX] = '\0';
 			rc = ecryptfs_add_global_auth_tok(
 				mount_crypt_stat,
-				mount_crypt_stat->global_default_fnek_sig);
+				mount_crypt_stat->global_default_fnek_sig,
+				ECRYPTFS_AUTH_TOK_FNEK);
 			if (rc) {
 				printk(KERN_ERR "Error attempting to register "
 				       "global fnek sig [%s]; rc = [%d]\n",