eCryptfs: Force RO mount when encrypted view is enabled

[pandora-kernel.git] / fs / ecryptfs / main.c

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 94afdfd..62b8ddc 100644 (file)
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -494,6 +494,7 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
 {
        struct super_block *s;
        struct ecryptfs_sb_info *sbi;
+       struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
        struct ecryptfs_dentry_info *root_info;
        const char *err = "Getting sb failed";
        struct inode *inode;
@@ -512,6 +513,7 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
                err = "Error parsing options";
                goto out;
        }
+       mount_crypt_stat = &sbi->mount_crypt_stat;
 
        s = sget(fs_type, NULL, set_anon_super, NULL);
        if (IS_ERR(s)) {
@@ -557,11 +559,19 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
 
        /**
         * Set the POSIX ACL flag based on whether they're enabled in the lower
-        * mount. Force a read-only eCryptfs mount if the lower mount is ro.
-        * Allow a ro eCryptfs mount even when the lower mount is rw.
+        * mount.
         */
        s->s_flags = flags & ~MS_POSIXACL;
-       s->s_flags |= path.dentry->d_sb->s_flags & (MS_RDONLY | MS_POSIXACL);
+       s->s_flags |= path.dentry->d_sb->s_flags & MS_POSIXACL;
+
+       /**
+        * Force a read-only eCryptfs mount when:
+        *   1) The lower mount is ro
+        *   2) The ecryptfs_encrypted_view mount option is specified
+        */
+       if (path.dentry->d_sb->s_flags & MS_RDONLY ||
+           mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
+               s->s_flags |= MS_RDONLY;
 
        s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
        s->s_blocksize = path.dentry->d_sb->s_blocksize;